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/*******************************************************************************
* Copyright (c) 2007, 2015 THALES GLOBAL SERVICES 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:
* Obeo - initial API and implementation
*******************************************************************************/
package org.eclipse.sirius.diagram.ui.tools.api.policy;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import org.eclipse.gef.EditPart;
import org.eclipse.gef.EditPolicy;
import org.eclipse.gef.Request;
import org.eclipse.gef.commands.Command;
import org.eclipse.gef.commands.CompoundCommand;
import org.eclipse.sirius.diagram.ui.provider.Messages;
/**
* This edit policy is composed of many edit policies.
*
* @author ymortier
*/
public class CompoundEditPolicy implements EditPolicy {
/** The delegated edit policies. */
private List<EditPolicy> delegatedEditPolicies = new LinkedList<EditPolicy>();
/** The host. */
private EditPart host;
/**
* if <code>true</code> then null command are added to the resulted compound
* command (so the command is unexecutable).
*/
private boolean allowNullCommand;
/**
* <code>true</code> if the resulted command can contain null value.
*
* @param allowNullCommand
* <code>true</code> if the resulted command can contain null
* value.
*/
public void setAllowNullCommand(final boolean allowNullCommand) {
this.allowNullCommand = allowNullCommand;
}
/**
* Returns <code>true</code> if the resulted command can contain null value.
*
* @return <code>true</code> if the resulted command can contain null value.
*/
public boolean isAllowNullCommand() {
return allowNullCommand;
}
/**
* {@inheritDoc}
*
* @see org.eclipse.gef.EditPolicy#activate()
*/
@Override
public void activate() {
final Iterator<EditPolicy> iterEditPolicies = this.delegatedEditPolicies.iterator();
while (iterEditPolicies.hasNext()) {
iterEditPolicies.next().activate();
}
}
/**
* {@inheritDoc}
*
* @see org.eclipse.gef.EditPolicy#deactivate()
*/
@Override
public void deactivate() {
final Iterator<EditPolicy> iterEditPolicies = this.delegatedEditPolicies.iterator();
while (iterEditPolicies.hasNext()) {
iterEditPolicies.next().deactivate();
}
}
/**
* {@inheritDoc}
*
* @see org.eclipse.gef.EditPolicy#eraseSourceFeedback(org.eclipse.gef.Request)
*/
@Override
public void eraseSourceFeedback(final Request request) {
final Iterator<EditPolicy> iterEditPolicies = this.delegatedEditPolicies.iterator();
while (iterEditPolicies.hasNext()) {
iterEditPolicies.next().eraseSourceFeedback(request);
}
}
/**
* {@inheritDoc}
*
* @see org.eclipse.gef.EditPolicy#eraseTargetFeedback(org.eclipse.gef.Request)
*/
@Override
public void eraseTargetFeedback(final Request request) {
final Iterator<EditPolicy> iterEditPolicies = this.delegatedEditPolicies.iterator();
while (iterEditPolicies.hasNext()) {
iterEditPolicies.next().eraseTargetFeedback(request);
}
}
/**
* {@inheritDoc}
*
* @see org.eclipse.gef.EditPolicy#getCommand(org.eclipse.gef.Request)
*/
@Override
public Command getCommand(final Request request) {
CompoundCommand ret = null;
final Iterator<EditPolicy> iterEditPolicies = this.delegatedEditPolicies.listIterator();
while (iterEditPolicies.hasNext()) {
final EditPolicy editPolicy = iterEditPolicies.next();
final Command command = editPolicy.getCommand(request);
if (command != null || isAllowNullCommand()) {
if (ret == null) {
ret = new CompoundCommand();
}
ret.add(command);
}
}
/*
* If there are only null commands in the result, we should return null.
*/
boolean containsOnlyNullCommands = true;
if (ret != null) {
for (final Object c : ret.getCommands()) {
if (c != null) {
containsOnlyNullCommands = false;
break;
}
}
}
return containsOnlyNullCommands ? null : ret;
}
/**
* {@inheritDoc}
*
* @see org.eclipse.gef.EditPolicy#getHost()
*/
@Override
public EditPart getHost() {
return this.host;
}
/**
* {@inheritDoc}
*
* @see org.eclipse.gef.EditPolicy#getTargetEditPart(org.eclipse.gef.Request)
*/
@Override
public EditPart getTargetEditPart(final Request request) {
EditPart res = null;
final Iterator<EditPolicy> iterEditPolicies = this.delegatedEditPolicies.iterator();
while (iterEditPolicies.hasNext() && res == null) {
final EditPolicy next = iterEditPolicies.next();
res = next.getTargetEditPart(request);
}
return res;
}
/**
* {@inheritDoc}
*
* @see org.eclipse.gef.EditPolicy#setHost(org.eclipse.gef.EditPart)
*/
@Override
public void setHost(final EditPart editpart) {
this.host = editpart;
final Iterator<EditPolicy> iterEditPolicies = this.delegatedEditPolicies.iterator();
while (iterEditPolicies.hasNext()) {
iterEditPolicies.next().setHost(editpart);
}
}
/**
* {@inheritDoc}
*
* @see org.eclipse.gef.EditPolicy#showSourceFeedback(org.eclipse.gef.Request)
*/
@Override
public void showSourceFeedback(final Request request) {
final Iterator<EditPolicy> iterEditPolicies = this.delegatedEditPolicies.iterator();
while (iterEditPolicies.hasNext()) {
iterEditPolicies.next().showSourceFeedback(request);
}
}
/**
* {@inheritDoc}
*
* @see org.eclipse.gef.EditPolicy#showTargetFeedback(org.eclipse.gef.Request)
*/
@Override
public void showTargetFeedback(final Request request) {
final Iterator<EditPolicy> iterEditPolicies = this.delegatedEditPolicies.iterator();
while (iterEditPolicies.hasNext()) {
iterEditPolicies.next().showTargetFeedback(request);
}
}
/**
* {@inheritDoc}
*
* @see org.eclipse.gef.EditPolicy#understandsRequest(org.eclipse.gef.Request)
*/
@Override
public boolean understandsRequest(final Request request) {
boolean res = false;
final Iterator<EditPolicy> iterEditPolicies = this.delegatedEditPolicies.iterator();
while (iterEditPolicies.hasNext() && !res) {
res = iterEditPolicies.next().understandsRequest(request);
}
return res;
}
/**
* Adds an edit policy.
*
* @param editPolicy
* the edit policy to add.
*/
public void addEditPolicy(final EditPolicy editPolicy) {
if (editPolicy == null) {
throw new IllegalArgumentException(Messages.CompoundEditPolicy_nullEditPolicyMsg);
}
this.delegatedEditPolicies.add(editPolicy);
}
/**
* Removes an edit policy.
*
* @param policy
* the policy to remove.
*/
public void removeEditPolicy(final EditPolicy policy) {
this.delegatedEditPolicies.remove(policy);
}
/**
* Return all edit policies.
*
* @return all edit policies.
*/
public List<EditPolicy> getEditPolicies() {
return this.delegatedEditPolicies;
}
}
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