avt.java

来自「java jdk 1.4的源码」· Java 代码 · 共 643 行 · 第 1/2 页

/*
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 1999 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 [e-mail].
 *
 * 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, Lotus
 * Development Corporation., http://www.lotus.com.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */
package org.apache.xalan.templates;

import org.apache.xml.dtm.DTM;

import java.util.Vector;
import java.util.StringTokenizer;

import org.apache.xml.utils.StringBufferPool;
import org.apache.xml.utils.FastStringBuffer;

import javax.xml.transform.TransformerException;

import org.apache.xpath.XPathContext;
import org.apache.xpath.XPath;
import org.apache.xalan.res.XSLTErrorResources;
import org.apache.xml.utils.PrefixResolver;
import org.apache.xalan.res.XSLMessages;
import org.apache.xalan.processor.StylesheetHandler;

import javax.xml.transform.ErrorListener;

/**
 * <meta name="usage" content="advanced"/>
 * Class to hold an Attribute Value Template.
 */
public class AVT implements java.io.Serializable, XSLTVisitable
{

  /**
   * If the AVT is not complex, just hold the simple string.
   * @serial
   */
  private String m_simpleString = null;

  /**
   * If the AVT is complex, hold a Vector of AVTParts.
   * @serial
   */
  private Vector m_parts = null;

  /**
   * The name of the attribute.
   * @serial
   */
  private String m_rawName;

  /**
   * Get the raw name of the attribute, with the prefix unprocessed.
   *
   * @return non-null reference to prefixed name.
   */
  public String getRawName()
  {
    return m_rawName;
  }

  /**
   * Get the raw name of the attribute, with the prefix unprocessed.
   *
   * @param rawName non-null reference to prefixed name.
   */
  public void setRawName(String rawName)
  {
    m_rawName = rawName;
  }

  /**
   * The name of the attribute.
   * @serial
   */
  private String m_name;

  /**
   * Get the local name of the attribute.
   *
   * @return non-null reference to name string.
   */
  public String getName()
  {
    return m_name;
  }

  /**
   * Set the local name of the attribute.
   *
   * @param name non-null reference to name string.
   */
  public void setName(String name)
  {
    m_name = name;
  }

  /**
   * The namespace URI of the owning attribute.
   * @serial
   */
  private String m_uri;

  /**
   * Get the namespace URI of the attribute.
   *
   * @return non-null reference to URI, "" if null namespace.
   */
  public String getURI()
  {
    return m_uri;
  }

  /**
   * Get the namespace URI of the attribute.
   *
   * @param uri non-null reference to URI, "" if null namespace.
   */
  public void setURI(String uri)
  {
    m_uri = uri;
  }

  /**
   * Construct an AVT by parsing the string, and either
   * constructing a vector of AVTParts, or simply hold
   * on to the string if the AVT is simple.
   *
   * @param handler non-null reference to StylesheetHandler that is constructing.
   * @param uri non-null reference to URI, "" if null namespace.
   * @param name  non-null reference to name string.
   * @param rawName prefixed name.
   * @param stringedValue non-null raw string value.
   *
   * @throws javax.xml.transform.TransformerException
   */
  public AVT(StylesheetHandler handler, String uri, String name, 
             String rawName, String stringedValue,
             ElemTemplateElement owner)
          throws javax.xml.transform.TransformerException
  {

    m_uri = uri;
    m_name = name;
    m_rawName = rawName;

    StringTokenizer tokenizer = new StringTokenizer(stringedValue, "{}\"\'",
                                  true);
    int nTokens = tokenizer.countTokens();

    if (nTokens < 2)
    {
      m_simpleString = stringedValue;  // then do the simple thing
    }
    else
    {
      FastStringBuffer buffer = StringBufferPool.get();
      FastStringBuffer exprBuffer = StringBufferPool.get();

      try
      {
        m_parts = new Vector(nTokens + 1);

        String t = null;  // base token
        String lookahead = null;  // next token
        String error = null;  // if non-null, break from loop

        while (tokenizer.hasMoreTokens())
        {
          if (lookahead != null)
          {
            t = lookahead;
            lookahead = null;
          }
          else
            t = tokenizer.nextToken();

          if (t.length() == 1)
          {
            switch (t.charAt(0))
            {
            case ('\"') :
            case ('\'') :
            {

              // just keep on going, since we're not in an attribute template
              buffer.append(t);

              break;
            }
            case ('{') :
            {

              try
              {
                // Attribute Value Template start
                lookahead = tokenizer.nextToken();

                if (lookahead.equals("{"))
                {

                  // Double curlys mean escape to show curly
                  buffer.append(lookahead);

                  lookahead = null;

                  break;  // from switch
                }

                /*
                else if(lookahead.equals("\"") || lookahead.equals("\'"))
                {
                // Error. Expressions can not begin with quotes.
                error = "Expressions can not begin with quotes.";
                break; // from switch
                }
                */
                else
                {
                  if (buffer.length() > 0)
                  {
                    m_parts.addElement(new AVTPartSimple(buffer.toString()));
                    buffer.setLength(0);
                  }

                  exprBuffer.setLength(0);

                  while (null != lookahead)
                  {
                    if (lookahead.length() == 1)
                    {
                      switch (lookahead.charAt(0))
                      {
                      case '\'' :
                      case '\"' :
                        {

                          // String start
                          exprBuffer.append(lookahead);

                          String quote = lookahead;

                          // Consume stuff 'till next quote
                          lookahead = tokenizer.nextToken();

                          while (!lookahead.equals(quote))
                          {
                            exprBuffer.append(lookahead);

                            lookahead = tokenizer.nextToken();
                          }

                          exprBuffer.append(lookahead);

                          lookahead = tokenizer.nextToken();

                          break;
                        }
                      case '{' :
                        {

                          // What's another curly doing here?
                          error = XSLMessages.createMessage(
                                                            XSLTErrorResources.ER_NO_CURLYBRACE, null);  //"Error: Can not have \"{\" within expression.";
                          
                          lookahead = null;  // breaks out of inner while loop

                          break;
                        }
                      case '}' :
                        {