--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/org.eclipse.draw2d/src/org/eclipse/draw2d/AbstractRouter.d	Sat Mar 14 18:23:29 2009 +0100
@@ -0,0 +1,123 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2005 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ * Port to the D programming language:
+ *     Frank Benoit <benoit@tionex.de>
+ *******************************************************************************/
+module org.eclipse.draw2d.AbstractRouter;
+
+import java.lang.all;
+
+import org.eclipse.draw2d.geometry.Point;
+import org.eclipse.draw2d.Connection;
+import org.eclipse.draw2d.ConnectionRouter;
+
+/**
+ * Base class for implementing a connection router. This class provides stubs for
+ * constraint usage, and some utility methods.
+ */
+public abstract class AbstractRouter
+    : ConnectionRouter
+{
+
+private static Point START_;
+private static Point END_;
+
+private static Point START(){
+    if( !initStaticCtor_done ) initStaticCtor();
+    assert(START_);
+    return START_;
+}
+private static Point END(){
+    if( !initStaticCtor_done ) initStaticCtor();
+    assert(END_);
+    return END_;
+}
+
+private static bool initStaticCtor_done = false;
+private static void initStaticCtor(){
+    synchronized( AbstractRouter.classinfo ){
+        if( !initStaticCtor_done ){
+            START_ = new Point();
+            END_ = new Point();
+            initStaticCtor_done = true;
+        }
+    }
+}
+
+/**
+ * Returns the constraint for the given Connection.
+ *
+ * @param connection The connection
+ * @return The constraint
+ * @since 2.0
+ */
+public Object getConstraint(Connection connection) {
+    return null;
+}
+
+/**
+ * A convenience method for obtaining a connection's endpoint.  The connection's endpoint
+ * is a point in absolute coordinates obtained by using its source and target {@link
+ * ConnectionAnchor}. The returned Point is a static singleton that is reused to reduce
+ * garbage collection. The caller may modify this point in any way. However, the point
+ * will be reused and its values overwritten during the next call to this method.
+ *
+ * @param connection The connection
+ * @return The endpoint
+ * @since 2.0
+ */
+protected Point getEndPoint(Connection connection) {
+    Point ref_ = connection.getSourceAnchor().getReferencePoint();
+    return END.setLocation(connection.getTargetAnchor().getLocation(ref_));
+}
+
+/**
+ * A convenience method for obtaining a connection's start point.  The connection's
+ * startpoint is a point in absolute coordinates obtained by using its source and target
+ * {@link ConnectionAnchor}. The returned Point is a static singleton that is reused to
+ * reduce garbage collection. The caller may modify this point in any way. However, the
+ * point will be reused and its values overwritten during the next call to this method.
+ *
+ * @param conn The connection
+ * @return The start point
+ * @since 2.0
+ */
+protected Point getStartPoint(Connection conn) {
+    Point ref_ = conn.getTargetAnchor().getReferencePoint();
+    return START.setLocation(conn.getSourceAnchor().getLocation(ref_));
+}
+
+/**
+ * Causes the router to discard any cached information about the given Connection.
+ *
+ * @param connection The connection to invalidate
+ * @since 2.0
+ */
+public void invalidate(Connection connection) { }
+
+/**
+ * Removes the given Connection from this routers list of Connections it is responsible
+ * for.
+ *
+ * @param connection The connection to remove
+ * @since 2.0
+ */
+public void remove(Connection connection) { }
+
+/**
+ * Sets the constraint for the given Connection.
+ *
+ * @param connection The connection
+ * @param constraint The constraint
+ * @since 2.0
+ */
+public void setConstraint(Connection connection, Object constraint) { }
+
+}