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Xerces2 provides high performance, fully compliant XML parsers in the Apache Xerces family. This new version of Xerces continues to build upon the Xerces Native Interface (XNI), a complete framework for building parser components and configurations that is extremely modular and easy to program. The Apache Xerces2 parser is the reference implementation of XNI but other parser components, configurations, and parsers can be written using the Xerces Native Interface. For complete design and implementation documents, refer to the XNI Manual. Xerces2 provides fully conforming XML Schema 1.0 and 1.1 processors. An experimental implementation of the "XML Schema Definition Language (XSD): Component Designators (SCD) Candidate Recommendation (January 2010)" is also provided for evaluation. For more information, refer to the XML Schema page. Xerces2 also provides a complete implementation of the Document Object Model Level 3 Core and Load/Save W3C Recommendations and provides a complete implementation of the XML Inclusions (XInclude) W3C Recommendation. It also provides support for OASIS XML Catalogs v1.1. Xerces2 is able to parse documents written according to the XML 1.1 Recommendation, except that it does not yet provide an option to enable normalization checking as described in section 2.13 of this specification. It also handles namespaces according to the XML Namespaces 1.1 Recommendation, and will correctly serialize XML 1.1 documents if the DOM level 3 load/save APIs are in use.

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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)
}