/*
* 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.ArrayList;
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.ElementContainer;
import org.drools.eclipse.flow.common.editor.core.ElementWrapper;
import org.eclipse.gef.commands.Command;
/**
* A command for deleting an element.
*/
public class DeleteElementCommand extends Command {
private ElementWrapper child;
private ElementContainer parent;
private List incomingElementWrappers = new ArrayList();
private List outgoingElementWrappers = new ArrayList();
private List incomingConnections = new ArrayList();
private List outgoingConnections = new ArrayList();
private void deleteConnections(ElementWrapper element) {
for (Iterator it = element.getIncomingConnections().iterator(); it.hasNext(); ) {
ElementConnection connection = (ElementConnection) it.next();
incomingElementWrappers.add(connection.getSource());
incomingConnections.add(connection);
}
for (Iterator it = element.getOutgoingConnections().iterator(); it.hasNext(); ) {
ElementConnection connection = (ElementConnection) it.next();
outgoingElementWrappers.add(connection.getTarget());
outgoingConnections.add(connection);
}
for (Iterator it = incomingConnections.iterator(); it.hasNext(); ) {
ElementConnection connection = (ElementConnection) it.next();
connection.disconnect();
}
for (Iterator it = outgoingConnections.iterator(); it.hasNext(); ) {
ElementConnection connection = (ElementConnection) it.next();
connection.disconnect();
}
}
public void execute() {
deleteConnections(child);
parent.removeElement(child);
}
private void restoreConnections() {
int i = 0;
for (Iterator it = incomingConnections.iterator(); it.hasNext(); ) {
ElementConnection connection = (ElementConnection) it.next();
connection.connect((ElementWrapper) incomingElementWrappers.get(i), child);
i++;
}
i = 0;
for (Iterator it = outgoingConnections.iterator(); it.hasNext(); ) {
ElementConnection connection = (ElementConnection) it.next();
connection.connect(child, (ElementWrapper) outgoingElementWrappers.get(i));
i++;
}
incomingConnections.clear();
incomingElementWrappers.clear();
outgoingConnections.clear();
outgoingElementWrappers.clear();
}
public void setChild(ElementWrapper child) {
this.child = child;
}
public void setParent(ElementContainer parent) {
this.parent = parent;
}
public void undo() {
parent.addElement(child);
restoreConnections();
}
}