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Added dwt-addons in original directory structure of eclipse.org
author Frank Benoit <benoit@tionex.de>
date Sat, 14 Mar 2009 18:23:29 +0100
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2005 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13 module org.eclipse.draw2d.AbstractRouter;
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14
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15 import java.lang.all;
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16
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17 import org.eclipse.draw2d.geometry.Point;
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18 import org.eclipse.draw2d.Connection;
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19 import org.eclipse.draw2d.ConnectionRouter;
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20
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21 /**
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22 * Base class for implementing a connection router. This class provides stubs for
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23 * constraint usage, and some utility methods.
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24 */
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25 public abstract class AbstractRouter
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26 : ConnectionRouter
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27 {
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28
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29 private static Point START_;
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30 private static Point END_;
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31
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32 private static Point START(){
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33 if( !initStaticCtor_done ) initStaticCtor();
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34 assert(START_);
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35 return START_;
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36 }
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37 private static Point END(){
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38 if( !initStaticCtor_done ) initStaticCtor();
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39 assert(END_);
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40 return END_;
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41 }
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42
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43 private static bool initStaticCtor_done = false;
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44 private static void initStaticCtor(){
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45 synchronized( AbstractRouter.classinfo ){
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46 if( !initStaticCtor_done ){
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47 START_ = new Point();
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48 END_ = new Point();
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49 initStaticCtor_done = true;
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50 }
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51 }
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52 }
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53
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54 /**
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55 * Returns the constraint for the given Connection.
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56 *
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57 * @param connection The connection
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58 * @return The constraint
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59 * @since 2.0
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60 */
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61 public Object getConstraint(Connection connection) {
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62 return null;
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63 }
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64
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65 /**
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66 * A convenience method for obtaining a connection's endpoint. The connection's endpoint
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67 * is a point in absolute coordinates obtained by using its source and target {@link
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68 * ConnectionAnchor}. The returned Point is a static singleton that is reused to reduce
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69 * garbage collection. The caller may modify this point in any way. However, the point
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70 * will be reused and its values overwritten during the next call to this method.
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71 *
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72 * @param connection The connection
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73 * @return The endpoint
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74 * @since 2.0
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75 */
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76 protected Point getEndPoint(Connection connection) {
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77 Point ref_ = connection.getSourceAnchor().getReferencePoint();
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78 return END.setLocation(connection.getTargetAnchor().getLocation(ref_));
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79 }
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80
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81 /**
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82 * A convenience method for obtaining a connection's start point. The connection's
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83 * startpoint is a point in absolute coordinates obtained by using its source and target
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84 * {@link ConnectionAnchor}. The returned Point is a static singleton that is reused to
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85 * reduce garbage collection. The caller may modify this point in any way. However, the
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86 * point will be reused and its values overwritten during the next call to this method.
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87 *
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88 * @param conn The connection
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89 * @return The start point
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90 * @since 2.0
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91 */
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92 protected Point getStartPoint(Connection conn) {
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93 Point ref_ = conn.getTargetAnchor().getReferencePoint();
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94 return START.setLocation(conn.getSourceAnchor().getLocation(ref_));
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95 }
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96
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97 /**
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98 * Causes the router to discard any cached information about the given Connection.
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99 *
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100 * @param connection The connection to invalidate
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101 * @since 2.0
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102 */
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103 public void invalidate(Connection connection) { }
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104
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105 /**
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106 * Removes the given Connection from this routers list of Connections it is responsible
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107 * for.
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108 *
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109 * @param connection The connection to remove
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110 * @since 2.0
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111 */
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112 public void remove(Connection connection) { }
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113
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114 /**
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115 * Sets the constraint for the given Connection.
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116 *
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117 * @param connection The connection
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118 * @param constraint The constraint
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119 * @since 2.0
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120 */
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121 public void setConstraint(Connection connection, Object constraint) { }
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122
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123 }