/*
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 2000-2002 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 "Xerces" 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) 1999, International
 * Business Machines, Inc., http://www.apache.org.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

package com.sun.org.apache.xerces.internal.xni;

/**
 * A structure that holds the components of an XML Namespaces qualified
 * name.
 * <p>
 * To be used correctly, the strings must be identical references for
 * equal strings. Within the parser, these values are considered symbols
 * and should always be retrieved from the <code>SymbolTable</code>.
 *
 * @see <a href="../../../../../xerces2/com/sun/org/apache/xerces/internal/util/SymbolTable.html">com.sun.org.apache.xerces.internal.util.SymbolTable</a>
 *
 * @author Andy Clark, IBM
 *
 * @version $Id: QName.java,v 1.5 2002/01/29 01:15:19 lehors Exp $
 */
public class QName 
    implements Cloneable {

    //
    // Data
    //

    /** 
     * The qname prefix. For example, the prefix for the qname "a:foo"
     * is "a".
     */
    public String prefix;

    /** 
     * The qname localpart. For example, the localpart for the qname "a:foo"
     * is "foo".
     */
    public String localpart;

    /** 
     * The qname rawname. For example, the rawname for the qname "a:foo"
     * is "a:foo".
     */
    public String rawname;

    /** 
     * The URI to which the qname prefix is bound. This binding must be
     * performed by a XML Namespaces aware processor.
     */
    public String uri;

    //
    // Constructors
    //

    /** Default constructor. */
    public QName() {
        clear();
    } // <init>()

    /** Constructs a QName with the specified values. */
    public QName(String prefix, String localpart, String rawname, String uri) {
        setValues(prefix, localpart, rawname, uri);
    } // <init>(String,String,String,String)

    /** Constructs a copy of the specified QName. */
    public QName(QName qname) {
        setValues(qname);
    } // <init>(QName)

    //
    // Public methods
    //

    /**
     * Convenience method to set the values of the qname components.
     * 
     * @param QName The qualified name to be copied. 
     */
    public void setValues(QName qname) {
        prefix = qname.prefix;
        localpart = qname.localpart;
        rawname = qname.rawname;
        uri = qname.uri;
    } // setValues(QName)

    /**
     * Convenience method to set the values of the qname components.
     * 
     * @param prefix    The qname prefix. (e.g. "a")
     * @param localpart The qname localpart. (e.g. "foo")
     * @param rawname   The qname rawname. (e.g. "a:foo")
     * @param uri       The URI binding. (e.g. "http://foo.com/mybinding")
     */
    public void setValues(String prefix, String localpart, String rawname, 
                          String uri) {
        this.prefix = prefix;
        this.localpart = localpart;
        this.rawname = rawname;
        this.uri = uri;
    } // setValues(String,String,String,String)

    /** Clears the values of the qname components. */
    public void clear() {
        prefix = null;
        localpart = null;
        rawname = null;
        uri = null;
    } // clear()

    //
    // Cloneable methods
    //

    /** Returns a clone of this object. */
    public Object clone() {
        return new QName(this);
    } // clone():Object

    //
    // Object methods
    //

    /** Returns the hashcode for this object. */
    public int hashCode() {
        if (uri != null) {
            return uri.hashCode() + localpart.hashCode();
        }
        return rawname.hashCode();
    } // hashCode():int

    /** Returns true if the two objects are equal. */
    public boolean equals(Object object) {
        if (object instanceof QName) {
            QName qname = (QName)object;
            if (qname.uri != null) {
                return uri == qname.uri && localpart == qname.localpart;
            }
            else if (uri == null) {
                return rawname == qname.rawname;
            }
            // fall through and return not equal
        }
        return false;
    } // equals(Object):boolean

    /** Returns a string representation of this object. */
    public String toString() {

        StringBuffer str = new StringBuffer();
        boolean comma = false;
        if (prefix != null) {
            str.append("prefix=\""+prefix+'"');
            comma = true;
        }
        if (localpart != null) {
            if (comma) {
                str.append(',');
            }
            str.append("localpart=\""+localpart+'"');
            comma = true;
        }
        if (rawname != null) {
            if (comma) {
                str.append(',');
            }
            str.append("rawname=\""+rawname+'"');
            comma = true;
        }
        if (uri != null) {
            if (comma) {
                str.append(',');
            }
            str.append("uri=\""+uri+'"');
        }
        return str.toString();

    } // toString():String

} // class QName
