com.sun.jsftemplating.layout.facelets.NSContext Maven / Gradle / Ivy

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/*
 * The contents of this file are subject to the terms 
 * of the Common Development and Distribution License 
 * (the License).  You may not use this file except in
 * compliance with the License.
 * 
 * You can obtain a copy of the license at 
 * https://jsftemplating.dev.java.net/cddl1.html or
 * jsftemplating/cddl1.txt.
 * See the License for the specific language governing 
 * permissions and limitations under the License.
 * 
 * When distributing Covered Code, include this CDDL 
 * Header Notice in each file and include the License file 
 * at jsftemplating/cddl1.txt.  
 * If applicable, add the following below the CDDL Header, 
 * with the fields enclosed by brackets [] replaced by
 * you own identifying information: 
 * "Portions Copyrighted [year] [name of copyright owner]"
 * 
 * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
 */
package com.sun.jsftemplating.layout.facelets;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import javax.xml.XMLConstants;


/**
 *  	This class provides namespace support for facelets taglib.xml
 *	files.
 *
 * @author Ken Paulsen
 */
public class NSContext implements javax.xml.namespace.NamespaceContext {

    /**
     *	 Creates a default NSContext.
     */
    public NSContext() {
	addNamespace("xml", XMLConstants.XML_NS_URI);
	addNamespace("xmlns", XMLConstants.XMLNS_ATTRIBUTE_NS_URI);
    }

    /**
     *	 Returns the namespace for the given prefix.
     *
     *	@throws IllegalArgumentException If null prefix is given.
     */
    public String getNamespaceURI(String prefix) {
	if (prefix == null) {
	    throw new IllegalArgumentException("null is not allowed.");
	}
	String result = _uris.get(prefix);
	if (result == null) {
	    if (prefix.equals(XMLConstants.DEFAULT_NS_PREFIX)) {
		result = _defaultNSURI;
	    }
	    if (result == null) {
		result = XMLConstants.NULL_NS_URI;
	    }
	}
	return result;
    }

    /**
     *	 Returns the prefix for the given namespace.  If not mapped,
     *	    null is returned.
     *
     *	@throws IllegalArgumentException If null prefix is given.
     */
    public String getPrefix(String namespaceURI) {
	if (namespaceURI == null) {
	    throw new IllegalArgumentException("null is not allowed.");
	}
	String result = _prefixes.get(namespaceURI);
	if (result == null) {
	    if (namespaceURI.equals(_defaultNSURI)) {
		result = XMLConstants.DEFAULT_NS_PREFIX;
	    }
	}
	return result;
    }

    /**
     *	 This implementation doesn't support this functionality. Instead
     *	    returns the same result as {@link #getPrefix(String)} via an
     *	    Iterator.
     */
    public Iterator getPrefixes(String namespaceURI) {
	ArrayList list = new ArrayList();
	list.add(getPrefix(namespaceURI));
	return list.iterator();
    }

    /**
     *	 This method sets the default NS URI to be used when the default
     *	    prefix (XMLConstants.DEFAULT_NS_PREFIX) is
     *	    supplied.
     */
    public void setDefaultNSURI(String defaultNSURI) {
	_defaultNSURI = defaultNSURI;
    }

    /**
     *	 This method returns the default NS URI (null if not set).
     */
    public String getDefaultNSURI() {
	return _defaultNSURI;
    }

    /**
     *	 This method registers a Namespace mapping.
     */
    public void addNamespace(String prefix, String uri) {
	_uris.put(prefix, uri);
	_prefixes.put(uri, prefix);
    }

    private String _defaultNSURI = null;

    private Map _uris   = new HashMap();
    private Map _prefixes   = new HashMap();
}