stylesheethandler.java

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/*
 * 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.processor;

import java.net.URL;

import java.io.IOException;

import javax.xml.transform.sax.TemplatesHandler;
import javax.xml.transform.Templates;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerConfigurationException;

import java.util.Stack;

import org.apache.xalan.res.XSLMessages;
import org.apache.xalan.res.XSLTErrorResources;
import org.apache.xalan.templates.Constants;
import org.apache.xalan.templates.ElemTemplateElement;
import org.apache.xalan.templates.ElemUnknown;
import org.apache.xalan.templates.ElemForEach;
import org.apache.xalan.templates.StylesheetRoot;
import org.apache.xalan.templates.Stylesheet;
import org.apache.xml.utils.NodeConsumer;
import org.apache.xml.utils.PrefixResolver;
import org.apache.xml.utils.XMLCharacterRecognizer;
import org.apache.xml.utils.BoolStack;
import org.apache.xpath.compiler.FunctionTable;
import org.apache.xpath.compiler.XPathParser;
import org.apache.xpath.functions.Function;
import org.apache.xpath.XPathFactory;
import org.apache.xpath.XPath;

import org.apache.xpath.functions.FuncExtFunction;
import org.apache.xalan.extensions.ExpressionVisitor;
import org.w3c.dom.Node;

import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.DTDHandler;
import org.xml.sax.EntityResolver;
import org.xml.sax.InputSource;
import org.xml.sax.Locator;

import org.xml.sax.helpers.NamespaceSupport;
import org.apache.xml.utils.NamespaceSupport2;
import org.xml.sax.helpers.DefaultHandler;

import javax.xml.transform.SourceLocator;
import javax.xml.transform.ErrorListener;
import javax.xml.transform.TransformerException;

import org.apache.xml.utils.SAXSourceLocator;

/**
 * <meta name="usage" content="advanced"/>
 * Initializes and processes a stylesheet via SAX events.
 * This class acts as essentially a state machine, maintaining
 * a ContentHandler stack, and pushing appropriate content
 * handlers as parse events occur.
 */
public class StylesheetHandler extends DefaultHandler
        implements TemplatesHandler, PrefixResolver, NodeConsumer
{

  /**
   * Create a StylesheetHandler object, creating a root stylesheet
   * as the target.
   *
   * @param processor non-null reference to the transformer factory that owns this handler.
   *
   * @throws TransformerConfigurationException if a StylesheetRoot
   * can not be constructed for some reason.
   */
  public StylesheetHandler(TransformerFactoryImpl processor)
          throws TransformerConfigurationException
  {

    // m_schema = new XSLTSchema();
    init(processor);
  }

  /**
   * Static flag to let us know if the XPath functions table
   * has been initialized.
   */
  private static boolean m_xpathFunctionsInited = false;

  /**
   * Do common initialization.
   *
   * @param processor non-null reference to the transformer factory that owns this handler.
   */
  void init(TransformerFactoryImpl processor)
  {

    // Not sure about double-check of this flag, but
    // it seems safe...
    if (false == m_xpathFunctionsInited)
    {
      synchronized (this)
      {
        if (false == m_xpathFunctionsInited)
        {
          m_xpathFunctionsInited = true;

          Function func = new org.apache.xalan.templates.FuncDocument();

          FunctionTable.installFunction("document", func);

          // func = new org.apache.xalan.templates.FuncKey();
          // FunctionTable.installFunction("key", func);
          func = new org.apache.xalan.templates.FuncFormatNumb();

          FunctionTable.installFunction("format-number", func);
        }
      }
    }

    m_stylesheetProcessor = processor;

    // Set the initial content handler.
    m_processors.push(m_schema.getElementProcessor());
    this.pushNewNamespaceSupport();

    // m_includeStack.push(SystemIDResolver.getAbsoluteURI(this.getBaseIdentifier(), null));
    // initXPath(processor, null);
  }

  /**
   * Process an expression string into an XPath.
   * Must be public for access by the AVT class.
   *
   * @param str A non-null reference to a valid or invalid XPath expression string.
   *
   * @return A non-null reference to an XPath object that represents the string argument.
   *
   * @throws javax.xml.transform.TransformerException if the expression can not be processed.
   * @see <a href="http://www.w3.org/TR/xslt#section-Expressions">Section 4 Expressions in XSLT Specification</a>
   */
  public XPath createXPath(String str, ElemTemplateElement owningTemplate)
          throws javax.xml.transform.TransformerException
  {
    ErrorListener handler = m_stylesheetProcessor.getErrorListener();
    XPath xpath = new XPath(str, owningTemplate, this, XPath.SELECT, handler);
    // Visit the expression, registering namespaces for any extension functions it includes.
    xpath.callVisitors(xpath, new ExpressionVisitor(getStylesheetRoot()));
    return xpath;
  }

  /**
   * Process an expression string into an XPath.
   *
   * @param str A non-null reference to a valid or invalid match pattern string.
   *
   * @return A non-null reference to an XPath object that represents the string argument.
   *
   * @throws javax.xml.transform.TransformerException if the pattern can not be processed.
   * @see <a href="http://www.w3.org/TR/xslt#patterns">Section 5.2 Patterns in XSLT Specification</a>
   */
  XPath createMatchPatternXPath(String str, ElemTemplateElement owningTemplate)
          throws javax.xml.transform.TransformerException
  {
    ErrorListener handler = m_stylesheetProcessor.getErrorListener();
    XPath xpath = new XPath(str, owningTemplate, this, XPath.MATCH, handler);
    // Visit the expression, registering namespaces for any extension functions it includes.
    xpath.callVisitors(xpath, new ExpressionVisitor(getStylesheetRoot()));
    return xpath;    
  }

  /**
   * Given a namespace, get the corrisponding prefix from the current
   * namespace support context.
   *
   * @param prefix The prefix to look up, which may be an empty string ("") for the default Namespace.
   *
   * @return The associated Namespace URI, or null if the prefix
   *         is undeclared in this context.
   */
  public String getNamespaceForPrefix(String prefix)
  {
    return this.getNamespaceSupport().getURI(prefix);
  }

  /**
   * Given a namespace, get the corrisponding prefix.  This is here only
   * to support the {@link org.apache.xml.utils.PrefixResolver} interface,
   * and will throw an error if invoked on this object.
   *
   * @param prefix The prefix to look up, which may be an empty string ("") for the default Namespace.
   * @param context The node context from which to look up the URI.
   *
   * @return The associated Namespace URI, or null if the prefix
   *         is undeclared in this context.
   */
  public String getNamespaceForPrefix(String prefix, org.w3c.dom.Node context)
  {

    // Don't need to support this here.  Return the current URI for the prefix,
    // ignoring the context.
    assertion(true, "can't process a context node in StylesheetHandler!");

    return null;
  }

  /**
   * Utility function to see if the stack contains the given URL.
   *
   * @param stack non-null reference to a Stack.
   * @param url URL string on which an equality test will be performed.
   *
   * @return true if the stack contains the url argument.
   */
  private boolean stackContains(Stack stack, String url)
  {

    int n = stack.size();
    boolean contains = false;

    for (int i = 0; i < n; i++)
    {
      String url2 = (String) stack.elementAt(i);

      if (url2.equals(url))
      {
        contains = true;

        break;
      }
    }

    return contains;
  }

  ////////////////////////////////////////////////////////////////////
  // Implementation of the TRAX TemplatesBuilder interface.
  ////////////////////////////////////////////////////////////////////

  /**
   * When this object is used as a ContentHandler or ContentHandler, it will
   * create a Templates object, which the caller can get once
   * the SAX events have been completed.
   * @return The stylesheet object that was created during
   * the SAX event process, or null if no stylesheet has
   * been created.
   *
   * @version Alpha
   * @author <a href="mailto:[e-mail]">Scott Boag</a>
   */
  public Templates getTemplates()
  {
    return getStylesheetRoot();
  }

  /**
   * Set the base ID (URL or system ID) for the stylesheet
   * created by this builder.  This must be set in order to
   * resolve relative URLs in the stylesheet.
   *
   * @param baseID Base URL for this stylesheet.
   */
  public void setSystemId(String baseID)
  {
    pushBaseIndentifier(baseID);
  }

  /**
   * Get the base ID (URI or system ID) from where relative
   * URLs will be resolved.
   *
   * @return The systemID that was set with {@link #setSystemId}.
   */
  public String getSystemId()
  {
    return this.getBaseIdentifier();
  }

  ////////////////////////////////////////////////////////////////////
  // Implementation of the EntityResolver interface.
  ////////////////////////////////////////////////////////////////////

  /**
   * Resolve an external entity.
   *
   * @param publicId The public identifer, or null if none is
   *                 available.
   * @param systemId The system identifier provided in the XML
   *                 document.
   * @return The new input source, or null to require the
   *         default behaviour.
   *
   * @throws org.xml.sax.SAXException if the entity can not be resolved.
   */
  public InputSource resolveEntity(String publicId, String systemId)
          throws org.xml.sax.SAXException
  {
    return getCurrentProcessor().resolveEntity(this, publicId, systemId);
  }

  ////////////////////////////////////////////////////////////////////
  // Implementation of DTDHandler interface.
  ////////////////////////////////////////////////////////////////////

  /**
   * Receive notification of a notation declaration.
   *
   * <p>By default, do nothing.  Application writers may override this
   * method in a subclass if they wish to keep track of the notations
   * declared in a document.</p>
   *
   * @param name The notation name.
   * @param publicId The notation public identifier, or null if not
   *                 available.
   * @param systemId The notation system identifier.
   * @see org.xml.sax.DTDHandler#notationDecl
   */
  public void notationDecl(String name, String publicId, String systemId)
  {
    getCurrentProcessor().notationDecl(this, name, publicId, systemId);
  }

  /**
   * Receive notification of an unparsed entity declaration.
   *
   * @param name The entity name.
   * @param publicId The entity public identifier, or null if not
   *                 available.
   * @param systemId The entity system identifier.
   * @param notationName The name of the associated notation.
   * @see org.xml.sax.DTDHandler#unparsedEntityDecl
   */
  public void unparsedEntityDecl(String name, String publicId,
                                 String systemId, String notationName)
  {
    getCurrentProcessor().unparsedEntityDecl(this, name, publicId, systemId,
                                             notationName);
  }

  /**
   * Given a namespace URI, and a local name or a node type, get the processor
   * for the element, or return null if not allowed.
   *
   * @param uri The Namespace URI, or an empty string.
   * @param localName The local name (without prefix), or empty string if not namespace processing.
   * @param rawName The qualified name (with prefix).
   *
   * @return A non-null reference to a element processor.
   *
   * @throws org.xml.sax.SAXException if the element is not allowed in the
   * found position in the stylesheet.
   */
  XSLTElementProcessor getProcessorFor(
          String uri, String localName, String rawName)
            throws org.xml.sax.SAXException
  {

    XSLTElementProcessor currentProcessor = getCurrentProcessor();
    XSLTElementDef def = currentProcessor.getElemDef();
    XSLTElementProcessor elemProcessor = def.getProcessorFor(uri, localName);

    if (null == elemProcessor
            && ((null == getStylesheet()
                || Double.valueOf(getStylesheet().getVersion()).doubleValue()
                   > Constants.XSLTVERSUPPORTED) 
                ||(!uri.equals(Constants.S_XSLNAMESPACEURL) &&
                            currentProcessor instanceof ProcessorStylesheetElement)
                || getElemVersion() > Constants.XSLTVERSUPPORTED
        ))
    {
      elemProcessor = def.getProcessorForUnknown(uri, localName);
    }

    if (null == elemProcessor)
      error(XSLMessages.createMessage(XSLTErrorResources.ER_NOT_ALLOWED_IN_POSITION, new Object[]{rawName}),null);//rawName + " is not allowed in this position in the stylesheet!",
            
                
    return elemProcessor;