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A processor for parsing, validating, serializing and manipulating XML, written in Java
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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 $Id$
*/
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)
}