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/*
* Copyright (c) 2002 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Common Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/cpl-v10.html
*
* Contributors:
* IBM - Initial API and implementation
* Jens Lukowski/Innoopract - initial renaming/restructuring
*
*/
package org.eclipse.wst.sse.core.contentmodel;
import java.util.Iterator;
import java.util.NoSuchElementException;
import org.eclipse.wst.contentmodel.CMDocument;
import org.eclipse.wst.contentmodel.CMNamedNodeMap;
import org.eclipse.wst.contentmodel.CMNamespace;
import org.eclipse.wst.contentmodel.CMNode;
/**
* This class can be used to intialize specific
* variables that need a content model, until the
* true content model is available. This prevents
* having to do lots of null checks.
*/
public class NullContentModel implements CMDocument {
private class NullCMNamedNodeMap implements CMNamedNodeMap {
public int getLength() {
return 0;
}
public CMNode getNamedItem(String name) {
return null;
}
public CMNode item(int index) {
return null;
}
public Iterator iterator() {
return new NullIterator();
}
}
private class NullIterator implements Iterator {
public NullIterator() {
}
public boolean hasNext() {
return false;
}
public Object next() {
throw new NoSuchElementException();
}
public void remove() {
throw new UnsupportedOperationException("can not remove regions via iterator"); //$NON-NLS-1$
}
}
public NullContentModel() {
super();
}
public CMNamedNodeMap getElements() {
return new NullCMNamedNodeMap();
}
public CMNamedNodeMap getEntities() {
return new NullCMNamedNodeMap();
}
public CMNamespace getNamespace() {
return null;
}
public String getNodeName() {
return null;
}
public int getNodeType() {
return 0;
}
public Object getProperty(String propertyName) {
return null;
}
public boolean supports(String propertyName) {
return false;
}
}
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