| /******************************************************************************* |
| * Copyright (c) 2001, 2005 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 |
| * Jens Lukowski/Innoopract - initial renaming/restructuring |
| * |
| *******************************************************************************/ |
| package org.eclipse.wst.xml.core.internal.provisional.contentmodel; |
| |
| import java.util.Iterator; |
| import java.util.NoSuchElementException; |
| |
| import org.eclipse.wst.xml.core.internal.contentmodel.CMDocument; |
| import org.eclipse.wst.xml.core.internal.contentmodel.CMNamedNodeMap; |
| import org.eclipse.wst.xml.core.internal.contentmodel.CMNamespace; |
| import org.eclipse.wst.xml.core.internal.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 static 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 static 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; |
| } |
| |
| } |