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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 *
 *
 * This file incorporates work covered by the following copyright and
 * permission notice:
 *
 * 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.
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 */

/*
 * $Id: QName.java,v 1.11 2010-11-01 04:34:17 joehw Exp $
 */
package com.sun.org.apache.xalan.internal.xsltc.compiler;

/**
 * @author Jacek Ambroziak
 * @author Santiago Pericas-Geertsen
 * @author Morten Jorgensen
 */
final class QName {
    private final String _localname;
    private String _prefix;
    private String _namespace;
    private String _stringRep;
    private int    _hashCode;

    public QName(String namespace, String prefix, String localname) {
	_namespace = namespace;
	_prefix    = prefix;
	_localname = localname;

	_stringRep =
	    (namespace != null && !namespace.equals(Constants.EMPTYSTRING)) ?
	    (namespace + ':' + localname) : localname;

	_hashCode  = _stringRep.hashCode() + 19; // cached for speed
    }

    public void clearNamespace() {
	_namespace = Constants.EMPTYSTRING;
    }

    public String toString() {
	return _stringRep;
    }

    public String getStringRep() {
	return _stringRep;
    }

    public boolean equals(Object other) {
	return (this == other)
	           || (other instanceof QName
	                   && _stringRep.equals(((QName) other).getStringRep()));
    }

    public String getLocalPart() {
	return _localname;
    }

    public String getNamespace() {
	return _namespace;
    }

    public String getPrefix() {
	return _prefix;
    }

    public int hashCode() {
	return _hashCode;
    }

    public String dump() {
	return "QName: " + _namespace + "(" + _prefix + "):" + _localname;
    }
}