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/*******************************************************************************
* Copyright (c) 2001, 2007 Oracle 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:
* Oracle Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jst.pagedesigner.itemcreation.command;
import org.eclipse.jst.jsf.common.dom.TagIdentifier;
import org.eclipse.jst.pagedesigner.dom.EditModelQuery;
import org.eclipse.jst.pagedesigner.dom.IDOMPosition;
import org.eclipse.jst.pagedesigner.utils.BodyHelper;
import org.eclipse.jst.pagedesigner.validation.caret.JSFRootContainerPositionRule;
import org.w3c.dom.Document;
/**
* Used to create a container that should only occur once per document. Typically
* used for HTML body and JSF f:view tags.
*
* <p><b>Provisional API - subject to change</b></p>
*
* Clients may reference but not sub-class.
* @author cbateman
*
*/
public final class SingletonContainerCreationCommand extends ContainerCreationCommand
{
private static final int MAX_DEPTH_TO_SEARCH_FOR_CONTAINER = 10;
/**
* @param domPosition
* @param containerTag
* @param tagBeingCreated
*/
public SingletonContainerCreationCommand(IDOMPosition domPosition,
TagIdentifier containerTag, TagIdentifier tagBeingCreated)
{
super(domPosition, containerTag, tagBeingCreated);
}
@Override
protected IDOMPosition doExecute()
{
return insertSingletonIfNotPresent();
}
private IDOMPosition insertSingletonIfNotPresent()
{
IDOMPosition domPosition = getDomPosition();
final TagIdentifier containerTag = getContainerTag();
final TagIdentifier tagBeingCreated = getTagBeingCreated();
final Document document = EditModelQuery.getDocumentNode(domPosition
.getContainerNode());
final boolean isContainerAlreadyPresent =
JSFRootContainerPositionRule.hasBasicContainers
(document, MAX_DEPTH_TO_SEARCH_FOR_CONTAINER);
if (isContainerAlreadyPresent)
{
// if the container and element to be created are the same,
// then return null indicating to abort
if (containerTag.equals(tagBeingCreated))
{
domPosition = null;
}
// otherwise, simply fall through keeping domPosition unchanged
}
// if the container isn't already present
else
{
if (!containerTag.equals(tagBeingCreated))
{
// if the container is different and doesn't exist, then add it.
domPosition = BodyHelper.insertBody(domPosition, containerTag.asQName(), "f"); //$NON-NLS-1$
}
// otherwise, fall through leaving domPosition unchanged
}
return domPosition;
}
@Override
protected boolean prepare()
{
throw new UnsupportedOperationException("don't use"); //$NON-NLS-1$
}
}
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