How to Pass Some Arguments to BaseHTTPRequestHandler in Python

Let's say we have an argument, which is a function that we want to pass to BaseHTTRequestHandler to handle a request and return an appropriate response based the request. By looking at HTTPServer class definition, it may not be really obvious how to do it.

It's actually pretty simple and straightforward how to do it. First we need to subclass HTTPServer and override the constructor that takes in our own new arguments. From the RequestHandler class, there'll be a property named server that gives us access to the HTTPServer instance. And since we've subclassed HTTPServer class, we can define as many properties as we want that those properties will be accessible in the server property of the HTTPRequestHandler. The example is shown below.

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#!/usr/bin/env python   import logging from BaseHTTPServer import HTTPServer from BaseHTTPServer import BaseHTTPRequestHandler   class HttpServerHandler(BaseHTTPRequestHandler):     def do_POST(self):         content_length = int(self.headers.getheader("Content-Length"))         request = self.rfile.read(content_length)         logging.info("Request: %s" % request)         # BaseHTTPRequestHandler has a property called server and because         # we create MyHTTPServer, it has a handler property         response = self.server.handler(request)         logging.info("Response: %s" % response)         self.send_response(200)         self.end_headers()         self.wfile.write(response)       class MyHTTPServer(HTTPServer):     """this class is necessary to allow passing custom request handler into        the RequestHandlerClass"""     def __init__(self, server_address, RequestHandlerClass, handler):         HTTPServer.__init__(self, server_address, RequestHandlerClass)         self.handler = handler               class HttpServer:     def __init__(self, name, host, port, handler):         self.name = name         self.host = host         self.port = port         self.handler = handler         self.server = None               def start(self):         logging.info('Starting %s at %s:%d' % (self.name, self.host, self.port))         # we need use MyHttpServer here         self.server = MyHTTPServer((self.host, self.port), HttpServerHandler,                                    self.handler)         self.server.serve_forever()           def stop(self):         if self.server:             logging.info('Stopping %s at %s:%d' % (self.name, self.host,                                                    self.port))             self.server.shutdown()   def server_handler(request):     if request == "foo":         return "bar"     elif request == "bar":         return "foo"     else:         return "foobar"   if __name__ == "__main__":     logging.basicConfig(format='%(asctime)s [%(levelname)s] %(message)s',                         level=logging.INFO)     server = HttpServer("test server", "localhost", 9999, server_handler)     server.start()

How to Implement DFS and BFS in Python

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#!/usr/bin/env python   class Graph(object):     def __init__(self):         # the key is the vertex, the value is the list of adjacent vertices         self.adjacents = {}         self.nedges = 0       def num_vertices(self):         return self.adjacents.keys()       def num_edges(self):         return self.nedges       def add_edge(self, v, w):         if v not in self.adjacents: self.adjacents[v] = []         self.adjacents[v].append(w)         if w not in self.adjacents: self.adjacents[w] = []         self.adjacents[w].append(v)         self.nedges += 1       def adjacent(self, v):         return self.adjacents[v]   class DepthFirstSearch(object):     def __init__(self, graph, start):         self.count = 0         self.markeddict = {}         self.edge_to = {}         self.start = start         self._dfs(graph, start)       def _dfs(self, graph, vertex):         self.markeddict[vertex] = True         self.count += 1         for v in graph.adjacent(vertex):             if not self.marked(v):                 self.edge_to[v] = vertex                 self._dfs(graph, v)       def marked(self, vertex):         return vertex in self.markeddict       def has_path_to(self, vertex):         return self.marked(vertex)       def path_to(self, vertex):         if not self.has_path_to(vertex): return None         path = []         path.append(vertex)         while vertex != self.start:             vertex = self.edge_to[vertex]             path.append(vertex)                   path.reverse()         return path   class BreadthFirstSearch(object):     def __init__(self, graph, start):         self.count = 0         self.markeddict = {}         self.edge_to = {}         self.start = start         self._bfs(graph, start)       def _bfs(self, graph, vertex):         self.markeddict[vertex] = True         self.count += 1         q = []         q.append(vertex)         while q:             key = q.pop(0)             for v in graph.adjacent(key):                 if not self.marked(v):                     q.append(v)                     self.count += 1                     self.markeddict[v] = True                     self.edge_to[v] = key       def marked(self, vertex):         return vertex in self.markeddict       def has_path_to(self, vertex):         return self.marked(vertex)       def path_to(self, vertex):         if not self.has_path_to(vertex): return None         path = []         path.append(vertex)         while vertex != self.start:             vertex = self.edge_to[vertex]             path.append(vertex)                   path.reverse()         return path   if __name__ == "__main__":     # key is the vertex and value is the list of adjacent vertices     graph = Graph()           graph.add_edge("0", "2")     graph.add_edge("3", "5")     graph.add_edge("3", "4")     graph.add_edge("0", "1")     graph.add_edge("1", "2")     graph.add_edge("2", "3")     graph.add_edge("2", "4")     graph.add_edge("0", "5")       dfs = DepthFirstSearch(graph, "0")     assert "0" == "-".join(dfs.path_to("0"))     assert "0-2-1" == "-".join(dfs.path_to("1"))     assert "0-2" == "-".join(dfs.path_to("2"))     assert "0-2-3" == "-".join(dfs.path_to("3"))     assert "0-2-3-4" == "-".join(dfs.path_to("4"))     assert "0-2-3-5" == "-".join(dfs.path_to("5"))     assert 6 == dfs.count           bfs = BreadthFirstSearch(graph, "0")     assert "0" == "-".join(bfs.path_to("0"))     assert "0-1" == "-".join(bfs.path_to("1"))     assert "0-2" == "-".join(bfs.path_to("2"))     assert "0-2-3" == "-".join(bfs.path_to("3"))     assert "0-2-4" == "-".join(bfs.path_to("4"))     assert "0-5" == "-".join(bfs.path_to("5"))     assert 6 == bfs.count

How to Reverse Order of Words in Python

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#!/usr/bin/env python   def reverse_words(string):     reverse(string, 0, len(string)-1)           prev_space_index = 0     for i in xrange(0, len(string)):         if string[i] == " ":             reverse(string, prev_space_index, i-1)             prev_space_index = i + 1       # the last word hasn't been reversed        if prev_space_index < len(string):         reverse(string, prev_space_index, len(string)-1)   def reverse(string, beg, end):     i = beg     j = end #    print string[beg:end]     while i < j:         string[i], string[j] = string[j], string[i]         i += 1         j -= 1       if __name__ == "__main__":     l = list("my first name is foo and my last name is bar")     reverse_words(l)           assert "bar is name last my and foo is name first my" == "".join(l)

How to Implement Permutations in Python

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#!/usr/bin/env python   def permutate(l, n, nl):     if n == 0:         if len(nl) != len(set(nl)): return         nl1 = []         for i in nl: nl1.append(l[i])         print nl1     else:         n = n - 1         nl1 = [x for x in nl]         for i in xrange(0, len(l)):             nl = [x for x in nl1]             nl.append(i)             permutate(l, n, nl)             del nl[:]   def permutations(l):     permutate(l, len(l), [])   if __name__ == "__main__":     permutations([1, 2, 3, 4])

Search Algorithms in Python

Below are some popular implementations of searching algorithms.

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#!/usr/bin/env python   class SequentialSearchDict(object):     class Node(object):         def __init__(self, key, value):             self.key = key             self.value = value             self.next = None           def __init__(self):         self.first = None         self.size = 0              def put(self, key, value):         self._put(key, value)           def _put(self, key, value):         n = self._get(key)         if n:             n.value = value             return 0         else:             # add the new node into the first             tmp = self.first             self.first = SequentialSearchDict.Node(key, value)             self.first.next = tmp             self.size += 1             return 1          def _get(self, key):         n = self.first         while n:             if n.key == key: return n             n = n.next         return None          def get(self, key):         n = self._get(key)         if n: return n.value         return n      class BinarySearchDict(object):     class Node(object):         def __init__(self, key, value):             self.key = key             self.value = value           def __init__(self):         self.size = 0         self.l = []              def put(self, key, value):         # the elements must be kept sorted for the binary search to work         index = self._get(key)         if index < 0:             self.l.append(BinarySearchDict.Node(key, value))             self.size += 1             return         n = self.l[index]         if n.key == key:             n.value = value         else:             self.l.append(BinarySearchDict.Node(key, value))             # shift all the elements to the right             if (index+1) < (len(self.l)-1):                 for i in xrange(len(self.l)-1, index, -1):                     self.l[i] = self.l[i-1]             self.size += 1                  def get(self, key):         # search using binary search         index = self._get(key)         if index < 0: return None         n = self.l[index]         if n.key == key: return n.value         return None              def _get(self, key):         lo = 0         hi = len(self.l) - 1         mid = (lo + hi) / 2         while lo <= mid and hi >= mid:             if self.l[mid].key > key:                 hi = mid - 1                 mid = (lo + hi) / 2             elif self.l[mid].key == key:                 return mid             elif self.l[mid].key < key:                 lo = mid + 1                 mid = (lo + hi) / 2         return mid          class BinarySearchTreeDict(object):     class Node(object):         def __init__(self, key, value):             self.key = key             self.value = value             self.left = None             self.right = None                   def __init__(self):         self.size = 0         self.root = None              def put(self, key, value):         self.root = self._put(key, value, self.root)          def get(self, key):         return self._get(key, self.root)               def _put(self, key, value, node):         if node == None:             self.size += 1             return BinarySearchTreeDict.Node(key, value)         if node.key == key:             node.value = value             return node         elif node.key < key: node.left = self._put(key, value, node.left)         else: node.right = self._put(key, value, node.right)         return node               def _get(self, key, node):         if node == None: return None         if node.key == key: return node.value         elif node.key < key: return self._get(key, node.left)         else: return self._get(key, node.right)      class BalancedSearchTreeDict(object):     class Node(object):         RED = True         BLACK = False                   def __init__(self, key, value):             self.key = key             self.value = value             self.left = None             self.right = None             self.color = BalancedSearchTreeDict.Node.RED                       def is_red(self, node):             if node == None: return False             return node.color == BalancedSearchTreeDict.Node.RED                   def rotate_left(self, node):             x = node.right             node.right = x.left             x.left = node             node.color = BalancedSearchTreeDict.Node.RED             return x                   def rotate_right(self, node):             x = node.left             node.left = x.right             x.right = node             node.color = BalancedSearchTreeDict.Node.RED             return x                   def flip_colors(self, node):             node.color = BalancedSearchTreeDict.Node.RED             node.left.color = BalancedSearchTreeDict.Node.BLACK             node.right.color = BalancedSearchTreeDict.Node.BLACK                   def __init__(self):         self.size = 0         self.root = None              def put(self, key, value):         self.root = self._put(key, value, self.root)         self.root.color = BalancedSearchTreeDict.Node.BLACK          def _put(self, key, value, node):         if node == None:             self.size += 1             return BalancedSearchTreeDict.Node(key, value)         if node.key == key:             node.value = value             return node         elif node.key < key: node.left = self._put(key, value, node.left)         else: node.right = self._put(key, value, node.right)                   # these are the properties of Red-Black tree for balancing         # the tree         if node.is_red(node.right) and not node.is_red(node.left):             node = node.rotate_left(node);         if node.is_red(node.left) and node.is_red(node.left.left):             node = node.rotate_right(node);         if node.is_red(node.left) and node.is_red(node.right):             node.flip_colors(node);                 return node               def get(self, key):         return self._get(key, self.root)           def _get(self, key, node):         if node == None: return None         if node.key == key: return node.value         elif node.key < key: return self._get(key, node.left)         else: return self._get(key, node.right)      class HashDict(object):     # choose this M to be a prime number     M = 977           def __init__(self, n=M):         self.size = 0         self.l = []         for i in xrange(0, n):             self.l.append(SequentialSearchDict())                   def _hash(self, key):         return (hash(key) & 0x7ffffff) % HashDict.M           def put(self, key, value):         d = self.l[self._hash(key)]         n = d._put(key, value)         self.size += n          def get(self, key):         return self.l[self._hash(key)].get(key)    if __name__ == "__main__":     searches = [SequentialSearchDict(),                 BinarySearchDict(),                 BinarySearchTreeDict(),                 BalancedSearchTreeDict(),                 HashDict()]     for s in searches:                                                                                                                                                                                                                          assert None == s.get("foo")         s.put("1", "a")         s.put("2", "b")         s.put("3", "c")         assert 3 == s.size         assert "b" == s.get("2")         assert "c" == s.get("3")         assert "a" == s.get("1")         s.put("3", "d")         assert 3 == s.size         assert "d" == s.get("3")         assert "b" == s.get("2")         assert "a" == s.get("1")         assert None == s.get("bar")

How to Implement Pascal Triangle in Python

My implementation of Pascal Triangle.

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#!/usr/bin/env python def pascal(n):     if n == 0:         return [1]     else:         l1 = pascal(n-1)         print l1         l2 = [1]         for i in xrange(1, len(l1)):             l2.append(l1[i-1] + l1[i])         l2 += [1]         return l2   if __name__ == "__main__":     import sys     if len(sys.argv) != 2:         print "Usage:", sys.argv[0], "n"         sys.exit(1)     pascal(int(sys.argv[1]))

How to Implement Binary Search in Python

My simple implementations of binary search algorithms (iterative and recursive) in Python.

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#!/usr/bin/env python   def search(l, i, func):     lo = 0     hi = len(l) - 1     mid = (lo + hi) / 2     return func(l, i, lo, mid, hi)       def recursive_binary_search(l, i, lo, mid, hi):     if lo > mid or hi < mid: return -1       if l[mid] > i:         hi = mid - 1         mid = (lo + hi) / 2         return recursive_binary_search(l, i, lo, mid, hi)     elif l[mid] == i:         return mid     elif l[mid] < i:         lo = mid + 1         mid = (lo + hi) / 2         return recursive_binary_search(l, i, lo, mid, hi)   def iterative_binary_search(l, i, lo, mid, hi):     while lo <= mid and hi >= mid:         if l[mid] > i:             hi = mid - 1             mid = (lo + hi) / 2         elif l[mid] == i:             return mid         elif l[mid] < i:             lo = mid + 1             mid = (lo + hi) / 2     return -1       if __name__ == "__main__":     l = [x for x in xrange(0, 10)]     print "Using recursive binary search"     print "Input:", l     for i in xrange(0, len(l)):         index = search(l, i, recursive_binary_search)         print "Searching for", i, ", got index", index         assert i == index     i = 10     index = search(l, i, recursive_binary_search)     print "Searching for", i, ", got index", index       print       print "Using iterative binary search"     print "Input:", l     for i in xrange(0, len(l)):         index = search(l, i, iterative_binary_search)         print "Searching for", i, ", got index", index         assert i == index     i = 10     index = search(l, i, iterative_binary_search)     print "Searching for", i, ", got index", index

How to Access SWT UI Components from Non-UI Thread

Accessing SWT components in a non-UI thread will cause an SWTException (invalid thread access) to be thrown. This example shows how an SWT application is started in a non-main thread and the main thread manipulates the SWT application by updating the text in the button and stopping the SWT application.

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import org.eclipse.jface.window.ApplicationWindow; import org.eclipse.swt.SWT; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Display;   public class SWTTest extends ApplicationWindow {     private Thread uiThread;     private Button button;           public SWTTest() {         super(null);     }           @Override     protected Control createContents(Composite parent) {         getShell().setText("SWTTest");         getShell().setSize(400, 100);                   Composite c = new Composite(parent, SWT.NONE);         c.setLayout(new FillLayout());                   button = new Button(c, SWT.NONE);         button.setText("Hello");                   return parent;     }           public Display getDisplay() {         // Calling Display.getCurrent() will most likely throw         // a NUllPointerException if it's called from a main thread.         // The correct way to get the Display instance is by passing the         // UI thread         return Display.findDisplay(uiThread);     }           public void start() {         // We store the UI thread for the getDisplay() method         uiThread= Thread.currentThread();         setBlockOnOpen(true);         open();     }           public void updateText(final String text) {         // Any SWT operations must be done in a UI thread, so we must         // use getDisplay().syncExec() or getDisplay().asyncExec().         getDisplay().syncExec(new Runnable() {             @Override             public void run() {                 button.setText(text);             }         });     }           public void stop() {         // Any SWT operations must be done in a UI thread, so we must         // use getDisplay().syncExec() or getDisplay().asyncExec().         getDisplay().syncExec(new Runnable() {             @Override             public void run() {                 close();                 getDisplay().dispose();             }         });     }           public static void main(String[] args) throws Exception {         final SWTTest app = new SWTTest();         // app.start() blocks, so we need to start it in a new thread.         new Thread(new Runnable() {             @Override             public void run() {                 System.out.println("Starting the GUI");                 app.start();             }         }).start();                   System.out.println("Sleeping for 3 secs");         Thread.sleep(3000);                   System.out.println("Updating the GUI");         app.updateText("Bye");                   System.out.println("Sleeping for 3 secs");         Thread.sleep(3000);                   System.out.println("Stopping the GUI");         app.stop();     } }

SWT/JFace Examples

This example contains a lot of examples how to use SWT/JFace components with MigLayout. Not all SWT/JFace components are covered here.

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import java.io.BufferedReader; import java.io.File; import java.io.FileReader; import java.io.IOException; import java.util.ArrayList; import java.util.List;   import net.miginfocom.swt.MigLayout;   import org.eclipse.core.runtime.IStatus; import org.eclipse.core.runtime.MultiStatus; import org.eclipse.core.runtime.Status; import org.eclipse.jface.action.Action; import org.eclipse.jface.action.IAction; import org.eclipse.jface.action.MenuManager; import org.eclipse.jface.dialogs.Dialog; import org.eclipse.jface.dialogs.ErrorDialog; import org.eclipse.jface.dialogs.IDialogConstants; import org.eclipse.jface.dialogs.MessageDialog; import org.eclipse.jface.preference.ColorSelector; import org.eclipse.jface.viewers.CellEditor; import org.eclipse.jface.viewers.ColumnWeightData; import org.eclipse.jface.viewers.ComboBoxCellEditor; import org.eclipse.jface.viewers.ComboViewer; import org.eclipse.jface.viewers.ICellModifier; import org.eclipse.jface.viewers.ILabelProviderListener; import org.eclipse.jface.viewers.IStructuredContentProvider; import org.eclipse.jface.viewers.ITableLabelProvider; import org.eclipse.jface.viewers.ITreeContentProvider; import org.eclipse.jface.viewers.LabelProvider; import org.eclipse.jface.viewers.ListViewer; import org.eclipse.jface.viewers.TableLayout; import org.eclipse.jface.viewers.TableViewer; import org.eclipse.jface.viewers.TextCellEditor; import org.eclipse.jface.viewers.TreeViewer; import org.eclipse.jface.viewers.Viewer; import org.eclipse.jface.window.ApplicationWindow; import org.eclipse.jface.wizard.IWizardPage; import org.eclipse.jface.wizard.Wizard; import org.eclipse.jface.wizard.WizardDialog; import org.eclipse.jface.wizard.WizardPage; import org.eclipse.swt.SWT; import org.eclipse.swt.dnd.DND; import org.eclipse.swt.dnd.DropTarget; import org.eclipse.swt.dnd.DropTargetAdapter; import org.eclipse.swt.dnd.DropTargetEvent; import org.eclipse.swt.dnd.FileTransfer; import org.eclipse.swt.dnd.Transfer; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.events.SelectionListener; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.DirectoryDialog; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Group; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Menu; import org.eclipse.swt.widgets.MessageBox; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.TabFolder; import org.eclipse.swt.widgets.TabItem; import org.eclipse.swt.widgets.Table; import org.eclipse.swt.widgets.TableColumn; import org.eclipse.swt.widgets.TableItem; import org.eclipse.swt.widgets.Text;   public class SWTApp extends ApplicationWindow {     public SWTApp() {         super(null);         addStatusLine();     }       @Override     protected Control createContents(Composite parent) {         getStatusLineManager().setMessage("Welcome to SWTApp");           TabFolder tabFolder = new TabFolder(parent, SWT.NONE);         TabItem tabItem = new TabItem(tabFolder, SWT.NONE);         tabItem.setText("Tab 1");         tabItem.setControl(new MyComposite1(tabFolder));           tabItem = new TabItem(tabFolder, SWT.NONE);         tabItem.setText("Tab 2");         tabItem.setControl(new MyComposite2(tabFolder));           tabItem = new TabItem(tabFolder, SWT.NONE);         tabItem.setText("Tab 3");         tabItem.setControl(new MyComposite3(tabFolder));           tabItem = new TabItem(tabFolder, SWT.NONE);         tabItem.setText("Tab 4");         tabItem.setControl(new MyComposite4(tabFolder));                   tabItem = new TabItem(tabFolder, SWT.NONE);         tabItem.setText("Tab 5");         tabItem.setControl(new MyComposite5(tabFolder));                   getShell().setText("SWTApp");         getShell().setSize(900, 700);           return parent;     };       static class MyComposite1 extends Composite {         public MyComposite1(Composite parent) {             super(parent, SWT.NONE);             setLayout(new MigLayout("", "[grow][grow]", "[grow, fill]"));               Group g1 = new Group(this, SWT.SHADOW_ETCHED_IN);             g1.setLayout(new MigLayout("", "[grow, fill]", "[][grow, fill]"));             g1.setLayoutData("grow");               Composite1 c1 = new Composite1(g1);             c1.setLayoutData("grow, wrap");               Composite2 c2 = new Composite2(g1);             c2.setLayoutData("grow");               Group g2 = new Group(this, SWT.SHADOW_ETCHED_IN);             g2.setLayout(new MigLayout("", "[grow, fill]", "[grow, fill]"));             g2.setLayoutData("grow");               Composite c3 = new Composite3(g2);             c3.setLayoutData("grow");         }     }       static class Composite1 extends Composite {         public Composite1(Composite parent) {             super(parent, SWT.NONE);             setLayout(new MigLayout("", "[grow, fill][]", "[grow, fill]"));               Composite c1 = new Composite(this, SWT.NONE);             c1.setLayout(new MigLayout("", "[][grow]", ""));             Label field1Label = new Label(c1, SWT.NONE);             field1Label.setText("Field 1");             Text field1Text = new Text(c1, SWT.BORDER);             field1Text.setLayoutData("grow, wrap");               Label field2Label = new Label(c1, SWT.NONE);             field2Label.setText("Field 2");             Text field2Text = new Text(c1, SWT.BORDER);             field2Text.setLayoutData("grow, wrap");               Label field3Label = new Label(c1, SWT.NONE);             field3Label.setText("Field 3");             Text field3Text = new Text(c1, SWT.BORDER);             field3Text.setLayoutData("grow, wrap");               Label field4Label = new Label(c1, SWT.NONE);             field4Label.setText("Field 4");             Text field4Text = new Text(c1, SWT.BORDER);             field4Text.setLayoutData("grow");               Composite c2 = new Composite(this, SWT.NONE);             c2.setLayout(new MigLayout("", "", "[grow]"));             Button startButton = new Button(c2, SWT.NONE);             startButton.setText("START");             startButton.setBackground(getDisplay().getSystemColor(SWT.COLOR_GREEN));             startButton.setLayoutData("grow, wrap");               Button stopButton = new Button(c2, SWT.NONE);             stopButton.setText("STOP");             stopButton.setBackground(getDisplay().getSystemColor(SWT.COLOR_RED));             stopButton.setLayoutData("grow, wrap");               Button advancedButton = new Button(c2, SWT.NONE);             advancedButton.setText("ADVANCED");             advancedButton.setLayoutData("grow, wrap");               ColorSelector cs = new ColorSelector(c2);             Button colorSelectorButton = cs.getButton();             colorSelectorButton.setText("COLOR");             colorSelectorButton.setLayoutData("grow");         }     }       static class Composite2 extends Composite {         public Composite2(Composite parent) {             super(parent, SWT.NONE);             setLayout(new MigLayout("", "[grow]", "[grow]"));               Text statusText = new Text(this, SWT.MULTI | SWT.BORDER);             statusText.setEditable(false);             statusText.setLayoutData("grow");         }     }       static class Composite3 extends Composite {         public Composite3(Composite parent) {             super(parent, SWT.NONE);             setLayout(new MigLayout("", "[grow]", "[grow][grow]"));               Button b1 = new Button(this, SWT.NONE);             b1.setText("Button 1");             b1.setLayoutData("grow, wrap");               Button b2 = new Button(this, SWT.NONE);             b2.setText("Button 2");             b2.setLayoutData("grow");         }     }       static class MyComposite2 extends Composite {         public MyComposite2(Composite parent) {             super(parent, SWT.NONE);             setLayout(new MigLayout("", "[grow, fill]", "[grow, fill][]"));               Composite c1 = new Composite(this, SWT.BORDER);             c1.setLayout(new MigLayout("", "[grow][grow][grow][grow]", "[grow]"));             c1.setLayoutData("wrap");               int[] styles = { SWT.SINGLE, SWT.MULTI };             for (int style = 0; style < styles.length; style++) {                 ListViewer lv = createListViewer(c1, styles[style]);                 lv.getList().setLayoutData("grow");             }               int[] selectionStyle = { SWT.SINGLE, SWT.MULTI };             int[] checkStyle = { SWT.NONE, SWT.CHECK };               for (int selection = 0; selection < selectionStyle.length; selection++) {                 for (int check = 0; check < checkStyle.length; check++) {                     int style = selectionStyle[selection] | checkStyle[check];                     TreeViewer tv = createTreeViewer(c1, style);                     tv.getTree().setLayoutData("grow");                 }             }               Composite c2 = new Composite(this, SWT.BORDER);             c2.setLayout(new MigLayout("", "[grow]", ""));             ComboViewer cv = createComboViewer(c2);             cv.getCombo().setLayoutData("grow");         }           private ComboViewer createComboViewer(Composite parent) {             ComboViewer viewer = new ComboViewer(parent, SWT.NONE);               viewer.setLabelProvider(new LabelProvider() {                 @Override                 public String getText(Object element) {                     return ((ListItem) element).name;                 }             });               viewer.setContentProvider(new IStructuredContentProvider() {                 @SuppressWarnings("unchecked")                 @Override                 public Object[] getElements(Object inputElement) {                     return ((List<ListItem>) inputElement).toArray();                 }                   @Override                 public void dispose() {                 }                   @Override                 public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {                 }             });               List<ListItem> input = new ArrayList<ListItem>();             for (int i = 0; i < 20; i++) {                 input.add(new ListItem("Item " + i, i));             }             viewer.setInput(input);               return viewer;         }           private ListViewer createListViewer(Composite parent, int style) {             ListViewer viewer = new ListViewer(parent, style);               viewer.setLabelProvider(new LabelProvider() {                 @Override                 public String getText(Object element) {                     return ((ListItem) element).name;                 }             });               viewer.setContentProvider(new IStructuredContentProvider() {                 @SuppressWarnings("unchecked")                 @Override                 public Object[] getElements(Object inputElement) {                     return ((List<ListItem>) inputElement).toArray();                 }                   @Override                 public void dispose() {                 }                   @Override                 public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {                 }             });               List<ListItem> input = new ArrayList<ListItem>();             for (int i = 0; i < 20; i++) {                 input.add(new ListItem("Item " + i, i));             }             viewer.setInput(input);               return viewer;         }           private TreeViewer createTreeViewer(Composite parent, int style) {             TreeViewer viewer = new TreeViewer(parent, style);               viewer.setContentProvider(new ITreeContentProvider() {                 public Object[] getChildren(Object parentElement) {                     return ((TreeNode) parentElement).getChildren().toArray();                 }                   public Object getParent(Object element) {                     return ((TreeNode) element).getParent();                 }                   public boolean hasChildren(Object element) {                     return ((TreeNode) element).getChildren().size() > 0;                 }                   public Object[] getElements(Object inputElement) {                     return ((TreeNode) inputElement).getChildren().toArray();                 }                   public void dispose() {                 }                   public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {                 }             });               viewer.setInput(getRootNode());               return viewer;         }           private TreeNode getRootNode() {             TreeNode root = new TreeNode("root");             root.addChild(new TreeNode("child 1").addChild(new TreeNode("subchild 1")));             root.addChild(new TreeNode("child 2").addChild(new TreeNode("subchild 2")                 .addChild(new TreeNode("grandchild 1"))));               return root;         }     }       static class ListItem {         public String name;         public int value;           public ListItem(String n, int v) {             name = n;             value = v;         }     }       static class TreeNode {         private String name;         private List<TreeNode> children = new ArrayList<TreeNode>();         private TreeNode parent;           public TreeNode(String n) {             name = n;         }           protected Object getParent() {             return parent;         }           public TreeNode addChild(TreeNode child) {             children.add(child);             child.parent = this;             return this;         }           public List<TreeNode> getChildren() {             return children;         }           public String toString() {             return name;         }     }       static class MyComposite3 extends Composite {         public MyComposite3(Composite parent) {             super(parent, SWT.NONE);             setLayout(new MigLayout("", "[grow]", "[grow]"));               Table table = createTable();             table.setLayoutData("grow");         }           private Table createTable() {             final String[] VALUE_SET = new String[] {"xxx", "yyy", "zzz"};             final String NAME_PROPERTY = "name";             final String VALUE_PROPERTY = "value";               Table table = new Table(this, SWT.FULL_SELECTION);               final TableViewer viewer = new TableViewer(table);             TableLayout layout = new TableLayout();             layout.addColumnData(new ColumnWeightData(50, 75, true));             layout.addColumnData(new ColumnWeightData(50, 75, true));             table.setLayout(layout);               TableColumn column = new TableColumn(table, SWT.CENTER);             column.setText("Name");             column = new TableColumn(table, SWT.NONE);             column.setText("Value");             table.setHeaderVisible(true);               viewer.setLabelProvider(new ITableLabelProvider() {                 @Override                 public void removeListener(ILabelProviderListener lpl) {                 }                   @Override                 public boolean isLabelProperty(Object element, String property) {                     return false;                 }                   @Override                 public void dispose() {                 }                   @Override                 public void addListener(ILabelProviderListener lpl) {                 }                   @Override                 public String getColumnText(Object element, int columnIndex) {                     switch (columnIndex) {                     case 0:                         return ((EditableTableItem) element).name;                     case 1:                         Number index = ((EditableTableItem) element).value;                         return VALUE_SET[index.intValue()];                     default:                         return "Invalid column: " + columnIndex;                     }                 }                   @Override                 public Image getColumnImage(Object element, int columnIndex) {                     return null;                 }             });               viewer.setContentProvider(new IStructuredContentProvider() {                 @Override                 public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {                 }                   @Override                 public void dispose() {                 }                   @Override                 public Object[] getElements(Object inputElement) {                     return (Object[]) inputElement;                 }             });               viewer.setCellModifier(new ICellModifier() {                 @Override                 public void modify(Object element, String property, Object value) {                     TableItem tableItem = (TableItem) element;                     EditableTableItem data = (EditableTableItem) tableItem.getData();                     if (NAME_PROPERTY.equals(property)) {                         data.name = value.toString();                     } else {                         data.value = (Integer) value;                     }                       viewer.refresh(data);                 }                   @Override                 public Object getValue(Object element, String property) {                     if (NAME_PROPERTY.equals(property)) {                         return ((EditableTableItem) element).name;                     } else {                         return ((EditableTableItem) element).value;                     }                 }                   @Override                 public boolean canModify(Object element, String property) {                     return true;                 }             });               viewer.setCellEditors(new CellEditor[] {                 new TextCellEditor(table),                 new ComboBoxCellEditor(table, VALUE_SET)             });               viewer.setInput(new Object[] {                new EditableTableItem("Item 1", 0),                new EditableTableItem("Item 2", 1)             });               viewer.setColumnProperties(new String[] {NAME_PROPERTY, VALUE_PROPERTY});               createMenu(table, viewer);               return table;         }           private void createMenu(Table table, TableViewer viewer) {             MenuManager popupMenu = new MenuManager();             IAction newRowAction = new NewRowAction(viewer);             popupMenu.add(newRowAction);             Menu menu = popupMenu.createContextMenu(table);             table.setMenu(menu);         }     }       static class EditableTableItem {         public String name;         public Integer value;           public EditableTableItem(String name, Integer value) {             this.name = name;             this.value = value;         }     }       static class NewRowAction extends Action {         private TableViewer viewer;           public NewRowAction(TableViewer viewer) {             super("Insert New Row");             this.viewer = viewer;         }           @Override         public void run() {             EditableTableItem newItem = new EditableTableItem(                 "new row", new Integer(2));             viewer.add(newItem);         }     }       static class MyComposite4 extends Composite {         public MyComposite4(Composite parent) {             super(parent, SWT.NONE);             setLayout(new MigLayout());               createPasswordDialogButton();             createMessageDialogButton();             createMessageBoxButton();             createErrorDialogButton();             createWizardDialogButton();         }           private Button createPasswordDialogButton() {             Button dialogButton = new Button(this, SWT.PUSH);             dialogButton.setText("Password Dialog...");             dialogButton.addSelectionListener(new SelectionListener() {                 @Override                 public void widgetSelected(SelectionEvent e) {                     UserNamePasswordDialog d = new UserNamePasswordDialog(getShell());                     d.open();                 }                   @Override                 public void widgetDefaultSelected(SelectionEvent e) {                 }             });               return dialogButton;         }           private Button createMessageDialogButton() {             Button dialogButton = new Button(this, SWT.PUSH);             dialogButton.setText("Message Dialog...");             dialogButton.addSelectionListener(new SelectionListener() {                 @Override                 public void widgetSelected(SelectionEvent e) {                     MessageDialog dialog = new MessageDialog(getShell(),                         "Greeting Dialog",                         null, "Hello! How are you today?",                         MessageDialog.QUESTION,                         new String[] { "Good", "Been better", "Excited about SWT!" },                         0);                     dialog.open();                 }                   @Override                 public void widgetDefaultSelected(SelectionEvent e) {                 }             });               return dialogButton;         }           private Button createMessageBoxButton() {             Button dialogButton = new Button(this, SWT.PUSH);             dialogButton.setText("Message Box...");             dialogButton.addSelectionListener(new SelectionListener() {                 @Override                 public void widgetSelected(SelectionEvent e) {                     MessageBox dialog = new MessageBox(getShell(),                         SWT.OK | SWT.CANCEL);                     dialog.setMessage("Do you wish to continue?");                     dialog.open();                 }                   @Override                 public void widgetDefaultSelected(SelectionEvent e) {                 }             });               return dialogButton;         }           private Button createErrorDialogButton() {             Button dialogButton = new Button(this, SWT.PUSH);             dialogButton.setText("Error Dialog...");             dialogButton.addSelectionListener(new SelectionListener() {                 @Override                 public void widgetSelected(SelectionEvent e) {                     ErrorDialog errorDialog = new ErrorDialog(getShell(),                         "Test Error Dialog",                         "This is a test error dialog",                         createStatus(),                         IStatus.ERROR | IStatus.INFO);                     errorDialog.open();                 }                   @Override                 public void widgetDefaultSelected(SelectionEvent e) {                 }             });               return dialogButton;         }           private IStatus createStatus() {             final String dummyPlugin = "some plugin";             IStatus[] statuses = new IStatus[2];             statuses[0] = new Status(IStatus.ERROR, dummyPlugin, IStatus.OK,                 "Oh no!  An error occurred!", new Exception());               statuses[1] = new Status(IStatus.INFO, dummyPlugin, IStatus.OK, "More errors!?!?",                 new Exception());               MultiStatus multiStatus = new MultiStatus(dummyPlugin, IStatus.OK, statuses,                 "Several errors have occurred.", new Exception());               return multiStatus;         }                   private Button createWizardDialogButton() {             Button dialogButton = new Button(this, SWT.PUSH);             dialogButton.setText("Wizard Dialog...");             dialogButton.addSelectionListener(new SelectionListener() {                 @Override                 public void widgetSelected(SelectionEvent e) {                    WizardDialog dialog = new WizardDialog(getShell(),                        new ProjectWizard());                    dialog.open();                 }                   @Override                 public void widgetDefaultSelected(SelectionEvent e) {                 }             });               return dialogButton;         }     }       static class UserNamePasswordDialog extends Dialog {         private static final int RESET_ID = IDialogConstants.NO_TO_ALL_ID + 1;         private Text userNameText;         private Text passwordText;           public UserNamePasswordDialog(Shell parentShell) {             super(parentShell);         }           @Override         protected void configureShell(Shell newShell) {             super.configureShell(newShell);             newShell.setText("Username/Password Dialog");         }                   @Override         protected Control createDialogArea(Composite parent) {             Composite composite = (Composite) super.createDialogArea(parent);             composite.setLayout(new MigLayout("", "[][grow]", ""));               Label userNameLabel = new Label(composite, SWT.NONE);             userNameLabel.setText("Username: " );             userNameText = new Text(composite, SWT.SINGLE | SWT.BORDER);             userNameText.setLayoutData("grow, wrap");               Label passwordLabel = new Label(composite, SWT.NONE);             passwordLabel.setText("Password: ");             passwordText = new Text(composite, SWT.SINGLE | SWT.PASSWORD | SWT.BORDER);             passwordText.setLayoutData("grow");               return composite;         }           @Override         protected void createButtonsForButtonBar(Composite parent) {             super.createButtonsForButtonBar(parent);             createButton(parent, RESET_ID, "Reset All", false);         }           @Override         protected void buttonPressed(int buttonId) {             if (buttonId == RESET_ID) {                 userNameText.setText("");                 passwordText.setText("");             } else {                 super.buttonPressed(buttonId);             }         }     }       static class DirectoryPage extends WizardPage {         public static final String PAGE_NAME = "Directory";         private Button button;           public DirectoryPage() {             super(PAGE_NAME, "Directory Page", null);         }           @Override         public void createControl(Composite parent) {             Composite topLevel = new Composite(parent, SWT.NONE);             topLevel.setLayout(new MigLayout());               button = new Button(topLevel, SWT.CHECK);             button.setText("Use default directory?");               setControl(topLevel);             setPageComplete(true);         }           public boolean useDefaultDirectory() {             return button.getSelection();         }     }           static class ChooseDirectoryPage extends WizardPage {         public static final String PAGE_NAME = "Choose Directory";         private Text text;           public ChooseDirectoryPage() {             super(PAGE_NAME, "Choose Directory Page", null);         }           @Override         public void createControl(Composite parent) {             Composite topLevel = new Composite(parent, SWT.NONE);             topLevel.setLayout(new MigLayout("", "[][grow][]", ""));               Label l = new Label(topLevel, SWT.CENTER);             l.setText("Enter the directory to use:");               text = new Text(topLevel, SWT.SINGLE | SWT.BORDER);             text.setEditable(false);             text.setLayoutData("grow");                           Button b = new Button(topLevel, SWT.PUSH);             b.setText("Choose Directory");             b.addSelectionListener(new SelectionListener() {                 @Override                 public void widgetSelected(SelectionEvent e) {                     DirectoryDialog dialog = new DirectoryDialog(getShell());                     String directory = dialog.open();                     text.setText(directory);                 }                                   @Override                 public void widgetDefaultSelected(SelectionEvent e) {                 }             });               setControl(topLevel);             setPageComplete(true);         }           public String getDirectory() {             return text.getText();         }     }           static class SummaryPage extends WizardPage {         public static final String PAGE_NAME = "Summary";         private Label textLabel;         private Composite topLevel;           public SummaryPage() {             super(PAGE_NAME, "Summary Page", null);         }           @Override         public void createControl(Composite parent) {             topLevel = new Composite(parent, SWT.NONE);             topLevel.setLayout(new MigLayout());               textLabel = new Label(topLevel, SWT.CENTER);             textLabel.setText("");             textLabel.setLayoutData("grow");                           setControl(topLevel);             setPageComplete(true);         }           public void updateText(String newText) {             textLabel.setText(newText);             topLevel.pack();         }     }           static class ProjectWizard extends Wizard {         public void addPages() {             addPage(new DirectoryPage());             addPage(new ChooseDirectoryPage());             addPage(new SummaryPage());         }           @Override         public boolean performFinish() {             DirectoryPage dirPage = getDirectoryPage();             if (dirPage.useDefaultDirectory()) {                 System.out.println("Using default directory");             } else {                 ChooseDirectoryPage choosePage = getChoosePage();                 System.out.println("Using directory: " + choosePage.getDirectory());             }             return true;         }           private ChooseDirectoryPage getChoosePage() {             return (ChooseDirectoryPage) getPage(ChooseDirectoryPage.PAGE_NAME);         }           private DirectoryPage getDirectoryPage() {             return (DirectoryPage) getPage(DirectoryPage.PAGE_NAME);         }           @Override         public boolean performCancel() {             System.out.println("Perform Cancel called");             return true;         }           @Override         public IWizardPage getNextPage(IWizardPage page) {             if (page instanceof DirectoryPage) {                 DirectoryPage dirPage = (DirectoryPage) page;                 if (dirPage.useDefaultDirectory()) {                     SummaryPage summaryPage = (SummaryPage) getPage(SummaryPage.PAGE_NAME);                     summaryPage.updateText("Using default directory");                     return summaryPage;                 }             }               IWizardPage nextPage = super.getNextPage(page);             if (nextPage instanceof SummaryPage) {                 SummaryPage summary = (SummaryPage) nextPage;                 DirectoryPage dirPage = getDirectoryPage();                 summary.updateText(dirPage.useDefaultDirectory() ? "Using default directory"                     : "Using directory: " + getChoosePage().getDirectory());             }             return nextPage;         }     }           static class MyComposite5 extends Composite {         public MyComposite5(Composite parent) {             super(parent, SWT.NONE);             setLayout(new MigLayout("", "[grow, fill]", "[grow, fill]"));                           Text text = createTextArea();             text.setLayoutData("grow");         }                   private Text createTextArea() {             Text text = new Text(this, SWT.MULTI | SWT.BORDER);                           DropTarget target = new DropTarget(text,                 DND.DROP_MOVE | DND.DROP_COPY | DND.DROP_DEFAULT);             target.setTransfer(new Transfer[] { FileTransfer.getInstance() });             target.addDropListener(new DropTargetAdapter() {                 @Override                 public void drop(DropTargetEvent event) {                     DropTarget target = (DropTarget) event.widget;                     Text t = (Text) target.getControl();                     String[] fileList = (String[]) event.data;                     t.setText(read(fileList[0]));                 }             });                           return text;         }                   private String read(String path) {             String text = "";             BufferedReader br = null;             try {                 File file = new File(path);                 br = new BufferedReader(new FileReader(file));                                   String line = "";                 while ((line = br.readLine()) != null) {                     text += line + System.getProperty("line.separator");                 }                 int lastIndex = text.length() -                     System.getProperty("line.separator").length();                 text = text.substring(0, lastIndex);             } catch (IOException e) {                 e.printStackTrace();             } finally {                 if (br != null) {                     try {                         br.close();                     } catch (IOException e) {                         e.printStackTrace();                     }                 }             }             return text;         }     }           public static void show() {         SWTApp app = new SWTApp();         app.setBlockOnOpen(true);         app.open();         Display.getCurrent().dispose();     } }

Getting Started with SWT and JFace

Setting up a development environment for SWT/JFace can be pretty difficult because most of the libraries needed are not available in Maven repository. Even if they are available in Maven repository, they are not always up to date. In this blog, I'm going to show you how to setup a development environment for SWT and JFace. This example uses Gradle and Eclipse 3.7

The easiest way to get the libraries needed for SWT/JFace is to copy those libraries from Eclipse plugins directory. For SWT, there are only two libraries required, the SWT library and the SWT native platform library. For JFace, we need the JFace libraries, Workbench libraries, Equinox library, and Command library. The example of build.gradle is shown below.

build.gradle

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apply plugin: 'java' apply plugin: 'eclipse'   repositories {     flatDir { dir 'lib' } }   dependencies {     // swt dependencies     compile name: "org.eclipse.swt_3.7.2.v3740f"     compile name: "org.eclipse.swt.gtk.linux.x86_3.7.2.v3740f"       // jface dependencies     compile name: "org.eclipse.jface_3.7.0.v20110928-1505"     compile name: "org.eclipse.jface.text_3.7.2.v20111213-1208"     compile name: "org.eclipse.jface.databinding_1.5.0.I20100907-0800"     compile name: "org.eclipse.ui.workbench_3.7.1.v20120104-1859"     compile name: "org.eclipse.ui.workbench.texteditor_3.7.0.v20110928-1504"     compile name: "org.eclipse.equinox.common_3.6.0.v20110523"     compile name: "org.eclipse.core.commands_3.6.0.I20110111-0800" }

SWTApp.java

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package swtproject;   import org.eclipse.swt.SWT; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Text;   public class SWTApp {       public static void show() {         Display display = new Display();         Shell shell = new Shell(display);           Text helloText = new Text(shell, SWT.CENTER);         helloText.setText("Hello SWT");         helloText.pack();           shell.pack();         shell.open();         while (!shell.isDisposed()) {             if (!display.readAndDispatch()) {                 display.sleep();             }         }         display.dispose();     } }

JFaceApp.java

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package swtproject;   import org.eclipse.jface.window.ApplicationWindow; import org.eclipse.swt.SWT; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Text;   public class JFaceApp extends ApplicationWindow {       public JFaceApp() {         super(null);     }       protected Control createContents(Composite parent) {         Text helloText = new Text(parent, SWT.CENTER);         helloText.setText("Hello JFace");         parent.pack();         return parent;     };           public static void show() {         JFaceApp app = new JFaceApp();         app.setBlockOnOpen(true);         app.open();         Display.getCurrent().dispose();     } }

Main.java

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package swtproject;   public class Main {       public static void main(String[] args) {         SWTApp.show();         JFaceApp.show();     } }