/*
 * 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.
 */
/*
 * $Id$
 */

package org.apache.xalan.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;
    }
}