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/*******************************************************************************
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* Copyright (c) 2000, 2010 IBM Corporation and others.
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* which accompanies this distribution, and is available at
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* http://www.eclipse.org/legal/epl-v10.html
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*
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* Contributors:
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* IBM Corporation - initial API and implementation
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*******************************************************************************/
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package org.eclipse.draw2d;
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import org.eclipse.draw2d.geometry.Point;
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/**
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* Base class for implementing a connection router. This class provides stubs
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* for constraint usage, and some utility methods.
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*/
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public abstract class AbstractRouter implements ConnectionRouter {
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private static final Point START = new Point();
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private static final Point END = new Point();
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/**
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* Returns the constraint for the given Connection.
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*
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* @param connection
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* The connection
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* @return The constraint
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* @since 2.0
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*/
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public Object getConstraint(Connection connection) {
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return null;
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}
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/**
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* A convenience method for obtaining a connection's endpoint. The
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* connection's endpoint is a point in absolute coordinates obtained by
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* using its source and target {@link ConnectionAnchor}. The returned Point
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* is a static singleton that is reused to reduce garbage collection. The
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* caller may modify this point in any way. However, the point will be
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* reused and its values overwritten during the next call to this method.
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*
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* @param connection
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* The connection
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* @return The endpoint
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* @since 2.0
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*/
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protected Point getEndPoint(Connection connection) {
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Point ref = connection.getSourceAnchor().getReferencePoint();
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return END.setLocation(connection.getTargetAnchor().getLocation(ref));
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}
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/**
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* A convenience method for obtaining a connection's start point. The
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* connection's startpoint is a point in absolute coordinates obtained by
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* using its source and target {@link ConnectionAnchor}. The returned Point
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* is a static singleton that is reused to reduce garbage collection. The
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* caller may modify this point in any way. However, the point will be
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* reused and its values overwritten during the next call to this method.
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*
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* @param conn
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* The connection
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* @return The start point
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* @since 2.0
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*/
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protected Point getStartPoint(Connection conn) {
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Point ref = conn.getTargetAnchor().getReferencePoint();
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return START.setLocation(conn.getSourceAnchor().getLocation(ref));
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}
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/**
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* Causes the router to discard any cached information about the given
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* Connection.
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*
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* @param connection
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* The connection to invalidate
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* @since 2.0
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*/
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public void invalidate(Connection connection) {
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}
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/**
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* Removes the given Connection from this routers list of Connections it is
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* responsible for.
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*
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* @param connection
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* The connection to remove
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* @since 2.0
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*/
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public void remove(Connection connection) {
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}
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/**
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* Sets the constraint for the given Connection.
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*
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* @param connection
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* The connection
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* @param constraint
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* The constraint
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* @since 2.0
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*/
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public void setConstraint(Connection connection, Object constraint) {
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}
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}
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