/*
* Copyright 2005 JBoss Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.drools.eclipse.flow.common.editor.core.command;
import java.util.Iterator;
import java.util.List;
import org.drools.eclipse.flow.common.editor.core.ElementConnection;
import org.drools.eclipse.flow.common.editor.core.ElementWrapper;
import org.eclipse.gef.commands.Command;
/**
* A command for reconnecting the target of a connection.
*/
public class ReconnectElementConnectionTargetCommand extends Command {
private ElementConnection connection;
private ElementWrapper oldTarget;
private ElementWrapper newTarget;
private ElementWrapper source;
public boolean canExecute() {
if (connection.getSource().equals(newTarget))
return false;
List connections = newTarget.getIncomingConnections();
for (Iterator it = connections.iterator(); it.hasNext(); ) {
ElementConnection connection = (ElementConnection) it.next();
if (connection.getSource().equals(source) && !connection.getTarget().equals(oldTarget))
return false;
}
return newTarget.acceptsIncomingConnection(connection, source);
}
public void execute() {
if (newTarget != null) {
connection.disconnect();
connection.connect(source, newTarget);
}
}
public void setTarget(ElementWrapper target) {
this.newTarget = target;
}
public void setConnection(ElementConnection connection) {
this.connection = connection;
this.source = connection.getSource();
this.oldTarget = connection.getTarget();
}
public void undo() {
connection.disconnect();
connection.connect(source, oldTarget);
}
public void redo() {
connection.disconnect();
connection.connect(source, newTarget);
}
}