/*******************************************************************************
* Copyright (c) 2007 IBM Corporation 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:
* IBM Corporation - initial API and implementation
******************************************************************************/
package org.eclipse.ui.internal.menus;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import org.eclipse.core.expressions.Expression;
import org.eclipse.jface.action.IContributionItem;
import org.eclipse.ui.internal.expressions.AlwaysEnabledExpression;
import org.eclipse.ui.menus.IContributionRoot;
/**
* Default implementation.
*
* @since 3.3
*/
final class ContributionRoot implements
IContributionRoot {
private List topLevelItems = new ArrayList();
private List itemsToExpressions = new ArrayList();
private InternalMenuService menuService;
private Expression restriction;
private String namespace;
public ContributionRoot(InternalMenuService menuService, Expression restriction, String namespace) {
this.menuService = menuService;
this.restriction = restriction;
this.namespace = namespace;
}
/* (non-Javadoc)
* @see org.eclipse.ui.menus.IContributionRoot#addContributionItem(org.eclipse.jface.action.IContributionItem, org.eclipse.core.expressions.Expression, org.eclipse.core.expressions.Expression)
*/
public void addContributionItem(IContributionItem item,
Expression visibleWhen) {
if (item == null)
throw new IllegalArgumentException();
topLevelItems.add(item);
if (visibleWhen == null)
visibleWhen = AlwaysEnabledExpression.INSTANCE;
menuService.registerVisibleWhen(item, visibleWhen, restriction,
createIdentifierId(item));
itemsToExpressions.add(item);
}
/**
* Create the activity identifier for this contribution item.
*
* @param item the item
* @return the identifier
*/
private String createIdentifierId(IContributionItem item) {
String identifierID = namespace != null ? namespace + '/'
+ item.getId() : null; // create the activity identifier ID. If
// this factory doesn't have a namespace
// it will be null.
return identifierID;
}
public Collection getItems() {
return topLevelItems;
}
/**
* Unregister all visible when expressions from the menu service.
*/
public void release() {
for (Iterator itemIter = itemsToExpressions.iterator(); itemIter.hasNext();) {
IContributionItem item = (IContributionItem) itemIter.next();
menuService.unregisterVisibleWhen(item);
}
}
/*
* (non-Javadoc)
*
* @see org.eclipse.ui.menus.IContributionRoot#registerVisibilityForChild(org.eclipse.jface.action.IContributionItem,
* org.eclipse.core.expressions.Expression,
* org.eclipse.core.expressions.Expression)
*/
public void registerVisibilityForChild(IContributionItem item,
Expression visibleWhen) {
if (item == null)
throw new IllegalArgumentException();
if (visibleWhen == null)
visibleWhen = AlwaysEnabledExpression.INSTANCE;
menuService.registerVisibleWhen(item, visibleWhen, restriction,
createIdentifierId(item));
itemsToExpressions.add(item);
}
}