/*
 * @(#)$Id$
 *
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 2001 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Xalan" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation and was
 * originally based on software copyright (c) 2001, Sun
 * Microsystems., http://www.sun.com.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 * @author Jacek Ambroziak
 * @author Santiago Pericas-Geertsen
 * @author Morten Jorgensen
 *
 */

package org.apache.xalan.xsltc.compiler;

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;
	if ((namespace != null) && (!namespace.equals(Constants.EMPTYSTRING))) {
	    _stringRep = namespace+':'+localname;
	}
	else {
	    _stringRep = localname;
	}

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

    public void clearDefaultNamespace() {
	if ((_prefix == null) || (_prefix.equals(Constants.EMPTYSTRING))) {
	    _namespace = null;
	    _stringRep = _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;
    }

    public String getLocalPart() {
	return _localname;
    }

    public String getNamespace() {
	return _namespace;
    }

    public String getPrefix() {
	return _prefix;
    }

    public int hashCode() {
	return _hashCode;
    }

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