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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.gef.editpolicies;
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import org.eclipse.gef.Request;
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import org.eclipse.gef.commands.Command;
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import org.eclipse.gef.requests.ChangeBoundsRequest;
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import org.eclipse.gef.requests.CreateRequest;
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import org.eclipse.gef.requests.GroupRequest;
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/**
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* An EditPolicy for use with container editparts. This policy can be used to
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* contribute commands to add, create, and orphan requests.
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*
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* @author hudsonr
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*/
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public abstract class ContainerEditPolicy extends AbstractEditPolicy {
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/**
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* Override to contribute to add requests.
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*
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* @param request
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* the add request
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* @return the command contribution to the add
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*/
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protected Command getAddCommand(GroupRequest request) {
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return null;
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}
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/**
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* Override to contribute to clone requests.
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*
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* @param request
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* the clone request
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* @return the command contribution to the clone
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*/
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protected Command getCloneCommand(ChangeBoundsRequest request) {
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return null;
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}
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/**
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* Overridden to check for add, create, and orphan.
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*
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* @see org.eclipse.gef.EditPolicy#getCommand(org.eclipse.gef.Request)
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*/
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public Command getCommand(Request request) {
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if (REQ_CREATE.equals(request.getType()))
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return getCreateCommand((CreateRequest) request);
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if (REQ_ADD.equals(request.getType()))
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return getAddCommand((GroupRequest) request);
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if (REQ_CLONE.equals(request.getType()))
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return getCloneCommand((ChangeBoundsRequest) request);
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if (REQ_ORPHAN_CHILDREN.equals(request.getType()))
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return getOrphanChildrenCommand((GroupRequest) request);
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return null;
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}
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/**
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* Clients must implement to contribute to create requests.
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*
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* @param request
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* the create request
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* @return <code>null</code> or a command contribution
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*/
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protected abstract Command getCreateCommand(CreateRequest request);
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/**
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* Override to contribute to orphan requests.
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*
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* @param request
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* the orphan request
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* @return a command contribution for the orphan
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*/
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protected Command getOrphanChildrenCommand(GroupRequest request) {
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return null;
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}
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}
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