qname.java

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/*
 * Copyright 1999-2004 The Apache Software Foundation.
 *
 * Licensed 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: QName.java,v 1.2.4.1 2005/09/15 08:15:52 suresh_emailid Exp $
 */
package com.sun.org.apache.xml.internal.utils;

import java.util.Stack;
import java.util.StringTokenizer;

import com.sun.org.apache.xml.internal.res.XMLErrorResources;
import com.sun.org.apache.xml.internal.res.XMLMessages;

import org.w3c.dom.Element;

/**
 * Class to represent a qualified name: "The name of an internal XSLT object,
 * specifically a named template (see [7 Named Templates]), a mode (see [6.7 Modes]),
 * an attribute set (see [8.1.4 Named Attribute Sets]), a key (see [14.2 Keys]),
 * a locale (see [14.3 Number Formatting]), a variable or a parameter (see
 * [12 Variables and Parameters]) is specified as a QName. If it has a prefix,
 * then the prefix is expanded into a URI reference using the namespace declarations
 * in effect on the attribute in which the name occurs. The expanded name
 * consisting of the local part of the name and the possibly null URI reference
 * is used as the name of the object. The default namespace is not used for
 * unprefixed names."
 * @xsl.usage general
 */
public class QName implements java.io.Serializable
{
    static final long serialVersionUID = 467434581652829920L;

  /**
   * The local name.
   * @serial
   */
  protected String _localName;

  /**
   * The namespace URI.
   * @serial
   */
  protected String _namespaceURI;

  /**
   * The namespace prefix.
   * @serial
   */
  protected String _prefix;

  /**
   * The XML namespace.
   */
  public static final String S_XMLNAMESPACEURI =
    "http://www.w3.org/XML/1998/namespace";

  /**
   * The cached hashcode, which is calculated at construction time.
   * @serial
   */
  private int m_hashCode;

  /**
   * Constructs an empty QName.
   * 20001019: Try making this public, to support Serializable? -- JKESS
   */
  public QName(){}

  /**
   * Constructs a new QName with the specified namespace URI and
   * local name.
   *
   * @param namespaceURI The namespace URI if known, or null
   * @param localName The local name
   */
  public QName(String namespaceURI, String localName)
  {
    this(namespaceURI, localName, false); 
  }

  /**
   * Constructs a new QName with the specified namespace URI and
   * local name.
   *
   * @param namespaceURI The namespace URI if known, or null
   * @param localName The local name
   * @param validate If true the new QName will be validated and an IllegalArgumentException will
   *                 be thrown if it is invalid.
   */
  public QName(String namespaceURI, String localName, boolean validate) 
  {

    // This check was already here.  So, for now, I will not add it to the validation
    // that is done when the validate parameter is true.
    if (localName == null)
      throw new IllegalArgumentException(XMLMessages.createXMLMessage(
            XMLErrorResources.ER_ARG_LOCALNAME_NULL, null)); //"Argument 'localName' is null");

    if (validate) 
    {
        if (!XML11Char.isXML11ValidNCName(localName))
        {
            throw new IllegalArgumentException(XMLMessages.createXMLMessage(
            XMLErrorResources.ER_ARG_LOCALNAME_INVALID,null )); //"Argument 'localName' not a valid NCName");
        }
    }
    
    _namespaceURI = namespaceURI;
    _localName = localName;
    m_hashCode = toString().hashCode();
  }
  
  /**
   * Constructs a new QName with the specified namespace URI, prefix
   * and local name.
   *
   * @param namespaceURI The namespace URI if known, or null
   * @param prefix The namespace prefix is known, or null
   * @param localName The local name
   * 
   */
  public QName(String namespaceURI, String prefix, String localName)
  {
     this(namespaceURI, prefix, localName, false);
  }
  
 /**
   * Constructs a new QName with the specified namespace URI, prefix
   * and local name.
   *
   * @param namespaceURI The namespace URI if known, or null
   * @param prefix The namespace prefix is known, or null
   * @param localName The local name
   * @param validate If true the new QName will be validated and an IllegalArgumentException will
   *                 be thrown if it is invalid.
   */
  public QName(String namespaceURI, String prefix, String localName, boolean validate)
  {

    // This check was already here.  So, for now, I will not add it to the validation
    // that is done when the validate parameter is true.
    if (localName == null)
      throw new IllegalArgumentException(XMLMessages.createXMLMessage(
            XMLErrorResources.ER_ARG_LOCALNAME_NULL, null)); //"Argument 'localName' is null");

    if (validate)
    {    
        if (!XML11Char.isXML11ValidNCName(localName))
        {
            throw new IllegalArgumentException(XMLMessages.createXMLMessage(
            XMLErrorResources.ER_ARG_LOCALNAME_INVALID,null )); //"Argument 'localName' not a valid NCName");
        }

        if ((null != prefix) && (!XML11Char.isXML11ValidNCName(prefix)))
        {
            throw new IllegalArgumentException(XMLMessages.createXMLMessage(
            XMLErrorResources.ER_ARG_PREFIX_INVALID,null )); //"Argument 'prefix' not a valid NCName");
        }

    }
    _namespaceURI = namespaceURI;
    _prefix = prefix;
    _localName = localName;
    m_hashCode = toString().hashCode();
  }  

  /**
   * Construct a QName from a string, without namespace resolution.  Good
   * for a few odd cases.
   *
   * @param localName Local part of qualified name
   * 
   */
  public QName(String localName)
  {
    this(localName, false);
  }
  
  /**
   * Construct a QName from a string, without namespace resolution.  Good
   * for a few odd cases.
   *
   * @param localName Local part of qualified name
   * @param validate If true the new QName will be validated and an IllegalArgumentException will
   *                 be thrown if it is invalid.
   */
  public QName(String localName, boolean validate)
  {

    // This check was already here.  So, for now, I will not add it to the validation
    // that is done when the validate parameter is true.
    if (localName == null)
      throw new IllegalArgumentException(XMLMessages.createXMLMessage(
            XMLErrorResources.ER_ARG_LOCALNAME_NULL, null)); //"Argument 'localName' is null");

    if (validate)
    {    
        if (!XML11Char.isXML11ValidNCName(localName))
        {
            throw new IllegalArgumentException(XMLMessages.createXMLMessage(
            XMLErrorResources.ER_ARG_LOCALNAME_INVALID,null )); //"Argument 'localName' not a valid NCName");
        }
    }
    _namespaceURI = null;
    _localName = localName;
    m_hashCode = toString().hashCode();
  }  

  /**
   * Construct a QName from a string, resolving the prefix
   * using the given namespace stack. The default namespace is
   * not resolved.
   *
   * @param qname Qualified name to resolve
   * @param namespaces Namespace stack to use to resolve namespace
   */
  public QName(String qname, Stack namespaces)
  {
    this(qname, namespaces, false);
  }

  /**
   * Construct a QName from a string, resolving the prefix
   * using the given namespace stack. The default namespace is
   * not resolved.
   *
   * @param qname Qualified name to resolve
   * @param namespaces Namespace stack to use to resolve namespace
   * @param validate If true the new QName will be validated and an IllegalArgumentException will
   *                 be thrown if it is invalid.
   */
  public QName(String qname, Stack namespaces, boolean validate)
  {

    String namespace = null;
    String prefix = null;
    int indexOfNSSep = qname.indexOf(':');

    if (indexOfNSSep > 0)
    {
      prefix = qname.substring(0, indexOfNSSep);

      if (prefix.equals("xml"))
      {
        namespace = S_XMLNAMESPACEURI;
      }
      // Do we want this?
      else if (prefix.equals("xmlns"))
      {
        return;
      }
      else
      {
        int depth = namespaces.size();

        for (int i = depth - 1; i >= 0; i--)
        {
          NameSpace ns = (NameSpace) namespaces.elementAt(i);

          while (null != ns)
          {
            if ((null != ns.m_prefix) && prefix.equals(ns.m_prefix))
            {
              namespace = ns.m_uri;
              i = -1;

              break;
            }

            ns = ns.m_next;
          }
        }
      }

      if (null == namespace)
      {
        throw new RuntimeException(
          XMLMessages.createXMLMessage(
            XMLErrorResources.ER_PREFIX_MUST_RESOLVE,
            new Object[]{ prefix }));  //"Prefix must resolve to a namespace: "+prefix);
      }
    }

    _localName = (indexOfNSSep < 0)
                 ? qname : qname.substring(indexOfNSSep + 1);
                 
    if (validate)
    {
        if ((_localName == null) || (!XML11Char.isXML11ValidNCName(_localName))) 
        {
           throw new IllegalArgumentException(XMLMessages.createXMLMessage(
            XMLErrorResources.ER_ARG_LOCALNAME_INVALID,null )); //"Argument 'localName' not a valid NCName");
        }
    }                 
    _namespaceURI = namespace;
    _prefix = prefix;
    m_hashCode = toString().hashCode();
  }

  /**
   * Construct a QName from a string, resolving the prefix
   * using the given namespace context and prefix resolver. 
   * The default namespace is not resolved.
   * 
   * @param qname Qualified name to resolve
   * @param namespaceContext Namespace Context to use
   * @param resolver Prefix resolver for this context
   */
  public QName(String qname, Element namespaceContext,
               PrefixResolver resolver)
  {
      this(qname, namespaceContext, resolver, false);
  }

  /**
   * Construct a QName from a string, resolving the prefix
   * using the given namespace context and prefix resolver. 
   * The default namespace is not resolved.
   * 
   * @param qname Qualified name to resolve
   * @param namespaceContext Namespace Context to use
   * @param resolver Prefix resolver for this context
   * @param validate If true the new QName will be validated and an IllegalArgumentException will
   *                 be thrown if it is invalid.
   */
  public QName(String qname, Element namespaceContext,
               PrefixResolver resolver, boolean validate)
  {

    _namespaceURI = null;

    int indexOfNSSep = qname.indexOf(':');

    if (indexOfNSSep > 0)
    {
      if (null != namespaceContext)
      {
        String prefix = qname.substring(0, indexOfNSSep);

        _prefix = prefix;