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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.xerces.stax;

import java.util.Collections;
import java.util.Iterator;
import java.util.NoSuchElementException;

import javax.xml.XMLConstants;
import javax.xml.namespace.NamespaceContext;

/**
 * 

A NamespaceContext which only * contains bindings for the xml and xmlns prefixes.

* * @xerces.internal * * @author Michael Glavassevich, IBM * * @version $Id: DefaultNamespaceContext.java 730672 2009-01-02 06:15:08Z mrglavas $ */ public final class DefaultNamespaceContext implements NamespaceContext { /** * Singleton instance. */ private static final DefaultNamespaceContext DEFAULT_NAMESPACE_CONTEXT_INSTANCE = new DefaultNamespaceContext(); private DefaultNamespaceContext() {} /** Returns the one and only instance of this class. */ public static DefaultNamespaceContext getInstance() { return DEFAULT_NAMESPACE_CONTEXT_INSTANCE; } public String getNamespaceURI(String prefix) { if (prefix == null) { throw new IllegalArgumentException("Prefix cannot be null."); } else if (XMLConstants.XML_NS_PREFIX.equals(prefix)) { return XMLConstants.XML_NS_URI; } else if (XMLConstants.XMLNS_ATTRIBUTE.equals(prefix)) { return XMLConstants.XMLNS_ATTRIBUTE_NS_URI; } return XMLConstants.NULL_NS_URI; } // getNamespaceURI(String) public String getPrefix(String namespaceURI) { if (namespaceURI == null) { throw new IllegalArgumentException("Namespace URI cannot be null."); } else if (XMLConstants.XML_NS_URI.equals(namespaceURI)) { return XMLConstants.XML_NS_PREFIX; } else if (XMLConstants.XMLNS_ATTRIBUTE_NS_URI.equals(namespaceURI)) { return XMLConstants.XMLNS_ATTRIBUTE; } return null; } // getPrefix(String) public Iterator getPrefixes(String namespaceURI) { if (namespaceURI == null) { throw new IllegalArgumentException("Namespace URI cannot be null."); } else if (XMLConstants.XML_NS_URI.equals(namespaceURI)) { return new Iterator() { boolean more = true; public boolean hasNext() { return more; } public Object next() { if (!hasNext()) { throw new NoSuchElementException(); } more = false; return XMLConstants.XML_NS_PREFIX; } public void remove() { throw new UnsupportedOperationException(); } }; } else if (XMLConstants.XMLNS_ATTRIBUTE_NS_URI.equals(namespaceURI)) { return new Iterator() { boolean more = true; public boolean hasNext() { return more; } public Object next() { if (!hasNext()) { throw new NoSuchElementException(); } more = false; return XMLConstants.XMLNS_ATTRIBUTE; } public void remove() { throw new UnsupportedOperationException(); } }; } return Collections.EMPTY_LIST.iterator(); } // getPrefixes(String) }




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