xpathcontext.java

java1.6众多例子参考

  /**
   * The stack of Variable stacks.  A VariableStack will be
   * pushed onto this stack for each template invocation.
   */
  private VariableStack m_variableStacks = new VariableStack();

  /**
   * Get the variable stack, which is in charge of variables and
   * parameters.
   *
   * @return the variable stack, which should not be null.
   */
  public final VariableStack getVarStack()
  {
    return m_variableStacks;
  }

  /** 
   * Get the variable stack, which is in charge of variables and
   * parameters.
   *
   * @param varStack non-null reference to the variable stack.
   */
  public final void setVarStack(VariableStack varStack)
  {
    m_variableStacks = varStack;
  }

  // ================ SourceTreeManager ===================

  /** The source tree manager, which associates Source objects to source 
   *  tree nodes. */
  private SourceTreeManager m_sourceTreeManager = new SourceTreeManager();

  /**
   * Get the SourceTreeManager associated with this execution context.
   *
   * @return the SourceTreeManager associated with this execution context.
   */
  public final SourceTreeManager getSourceTreeManager()
  {
    return m_sourceTreeManager;
  }

  /**
   * Set the SourceTreeManager associated with this execution context.
   *
   * @param mgr the SourceTreeManager to be associated with this 
   *        execution context.
   */
  public void setSourceTreeManager(SourceTreeManager mgr)
  {
    m_sourceTreeManager = mgr;
  }
  
  // =================================================

  /** The ErrorListener where errors and warnings are to be reported.   */
  private ErrorListener m_errorListener;

  /** A default ErrorListener in case our m_errorListener was not specified and our
   *  owner either does not have an ErrorListener or has a null one.
   */
  private ErrorListener m_defaultErrorListener;

  /**
   * Get the ErrorListener where errors and warnings are to be reported.
   *
   * @return A non-null ErrorListener reference.
   */
  public final ErrorListener getErrorListener()
  {

    if (null != m_errorListener)
        return m_errorListener;

    ErrorListener retval = null;

    try {
      if (null != m_ownerGetErrorListener)
        retval = (ErrorListener) m_ownerGetErrorListener.invoke(m_owner, new Object[] {});
    }
    catch (Exception e) {}

    if (null == retval)
    {
      if (null == m_defaultErrorListener) 
        m_defaultErrorListener = new com.sun.org.apache.xml.internal.utils.DefaultErrorHandler();
      retval = m_defaultErrorListener;
    }

    return retval;
  }

  /**
   * Set the ErrorListener where errors and warnings are to be reported.
   *
   * @param listener A non-null ErrorListener reference.
   */
  public void setErrorListener(ErrorListener listener) throws IllegalArgumentException
  {
    if (listener == null) 
      throw new IllegalArgumentException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_NULL_ERROR_HANDLER, null)); //"Null error handler");
    m_errorListener = listener;
  }


  // =================================================

  /** The TrAX URI Resolver for resolving URIs from the document(...)
   *  function to source tree nodes.  */
  private URIResolver m_uriResolver;

  /**
   * Get the URIResolver associated with this execution context.
   *
   * @return a URI resolver, which may be null.
   */
  public final URIResolver getURIResolver()
  {
    return m_uriResolver;
  }

  /**
   * Set the URIResolver associated with this execution context.
   *
   * @param resolver the URIResolver to be associated with this 
   *        execution context, may be null to clear an already set resolver.
   */
  public void setURIResolver(URIResolver resolver)
  {
    m_uriResolver = resolver;
  }

  // =================================================

  /** The reader of the primary source tree.    */
  public XMLReader m_primaryReader;

  /**
   * Get primary XMLReader associated with this execution context.
   *
   * @return The reader of the primary source tree.
   */
  public final XMLReader getPrimaryReader()
  {
    return m_primaryReader;
  }

  /**
   * Set primary XMLReader associated with this execution context.
   *
   * @param reader The reader of the primary source tree.
   */
  public void setPrimaryReader(XMLReader reader)
  {
    m_primaryReader = reader;
  }

  // =================================================


  /** Misnamed string manager for XPath messages.  */
  // private static XSLMessages m_XSLMessages = new XSLMessages();

  /**
   * Tell the user of an assertion error, and probably throw an
   * exception.
   *
   * @param b  If false, a TransformerException will be thrown.
   * @param msg The assertion message, which should be informative.
   * 
   * @throws javax.xml.transform.TransformerException if b is false.
   */
  private void assertion(boolean b, String msg) throws javax.xml.transform.TransformerException
  {
    if (!b) 
    {
      ErrorListener errorHandler = getErrorListener();

      if (errorHandler != null)
      {
        errorHandler.fatalError(
          new TransformerException(
            XSLMessages.createMessage(
              XPATHErrorResources.ER_INCORRECT_PROGRAMMER_ASSERTION,
              new Object[]{ msg }), (SAXSourceLocator)this.getSAXLocator()));
      }
    }
  }

  //==========================================================
  // SECTION: Execution context state tracking
  //==========================================================
  
  /**
   * The current context node list.
   */
  private Stack m_contextNodeLists = new Stack();
  
  public Stack getContextNodeListsStack() { return m_contextNodeLists; }
  public void setContextNodeListsStack(Stack s) { m_contextNodeLists = s; }

  /**
   * Get the current context node list.
   *
   * @return  the <a href="http://www.w3.org/TR/xslt#dt-current-node-list">current node list</a>,
   * also refered to here as a <term>context node list</term>.
   */
  public final DTMIterator getContextNodeList()
  {

    if (m_contextNodeLists.size() > 0)
      return (DTMIterator) m_contextNodeLists.peek();
    else
      return null;
  }

  /**
   * Set the current context node list.
   *
   * @param nl the <a href="http://www.w3.org/TR/xslt#dt-current-node-list">current node list</a>,
   * also refered to here as a <term>context node list</term>.
   * @xsl.usage internal
   */
  public final void pushContextNodeList(DTMIterator nl)
  {
    m_contextNodeLists.push(nl);
  }

  /**
   * Pop the current context node list.
   * @xsl.usage internal
   */
  public final void popContextNodeList()
  {
  	if(m_contextNodeLists.isEmpty())
  	  System.err.println("Warning: popContextNodeList when stack is empty!");
  	else
      m_contextNodeLists.pop();
  }

  /**
   * The ammount to use for stacks that record information during the 
   * recursive execution.
   */
  public static final int RECURSIONLIMIT = (1024*4);

  /** The stack of <a href="http://www.w3.org/TR/xslt#dt-current-node">current node</a> objects.
   *  Not to be confused with the current node list.  %REVIEW% Note that there 
   *  are no bounds check and resize for this stack, so if it is blown, it's all 
   *  over.  */
  private IntStack m_currentNodes = new IntStack(RECURSIONLIMIT);
   
//  private NodeVector m_currentNodes = new NodeVector();
  
  public IntStack getCurrentNodeStack() {return m_currentNodes; }
  public void setCurrentNodeStack(IntStack nv) { m_currentNodes = nv; }

  /**
   * Get the current context node.
   *
   * @return the <a href="http://www.w3.org/TR/xslt#dt-current-node">current node</a>.
   */
  public final int getCurrentNode()
  {
    return m_currentNodes.peek();
  }
  
  /**
   * Set the current context node and expression node.
   *
   * @param cn the <a href="http://www.w3.org/TR/xslt#dt-current-node">current node</a>.
   * @param en the sub-expression context node.
   */
  public final void pushCurrentNodeAndExpression(int cn, int en)
  {
    m_currentNodes.push(cn);
    m_currentExpressionNodes.push(cn);
  }

  /**
   * Set the current context node.
   */
  public final void popCurrentNodeAndExpression()
  {
    m_currentNodes.quickPop(1);
    m_currentExpressionNodes.quickPop(1);
  }
  
  /**
   * Push the current context node, expression node, and prefix resolver.
   *
   * @param cn the <a href="http://www.w3.org/TR/xslt#dt-current-node">current node</a>.
   * @param en the sub-expression context node.
   * @param nc the namespace context (prefix resolver.
   */
  public final void pushExpressionState(int cn, int en, PrefixResolver nc)
  {
    m_currentNodes.push(cn);
    m_currentExpressionNodes.push(cn);
    m_prefixResolvers.push(nc);
  }
  
  /**
   * Pop the current context node, expression node, and prefix resolver.
   */
  public final void popExpressionState()
  {
    m_currentNodes.quickPop(1);
    m_currentExpressionNodes.quickPop(1);
    m_prefixResolvers.pop();
  }



  /**
   * Set the current context node.
   *
   * @param n the <a href="http://www.w3.org/TR/xslt#dt-current-node">current node</a>.
   */
  public final void pushCurrentNode(int n)
  {
    m_currentNodes.push(n);
  }
  
  /**
   * Pop the current context node.
   */
  public final void popCurrentNode()
  {
    m_currentNodes.quickPop(1);
  }
  
  /**
   * Set the current predicate root.
   */
  public final void pushPredicateRoot(int n)
  {
    m_predicateRoots.push(n);
  }

  /**
   * Pop the current predicate root.
   */
  public final void popPredicateRoot()
  {
    m_predicateRoots.popQuick();
  }

  /**
   * Get the current predicate root.
   */
  public final int getPredicateRoot()
  {
    return m_predicateRoots.peepOrNull();
  }
  
  /**
   * Set the current location path iterator root.
   */
  public final void pushIteratorRoot(int n)
  {
    m_iteratorRoots.push(n);
  }

  /**
   * Pop the current location path iterator root.
   */
  public final void popIteratorRoot()
  {
    m_iteratorRoots.popQuick();
  }

  /**
   * Get the current location path iterator root.
   */
  public final int getIteratorRoot()
  {
    return m_iteratorRoots.peepOrNull();
  }
  
  /** A stack of the current sub-expression nodes.  */
  private NodeVector m_iteratorRoots = new NodeVector();

  /** A stack of the current sub-expression nodes.  */
  private NodeVector m_predicateRoots = new NodeVector();

  /** A stack of the current sub-expression nodes.  */
  private IntStack m_currentExpressionNodes = new IntStack(RECURSIONLIMIT);
  
     
  public IntStack getCurrentExpressionNodeStack() { return m_currentExpressionNodes; }
  public void setCurrentExpressionNodeStack(IntStack nv) { m_currentExpressionNodes = nv; }
  
  private IntStack m_predicatePos = new IntStack();
  
  public final int getPredicatePos()
  {
    return m_predicatePos.peek();
  }

  public final void pushPredicatePos(int n)
  {
    m_predicatePos.push(n);
  }

  public final void popPredicatePos()
  {
    m_predicatePos.pop();
  }

  /**
   * Get the current node that is the expression's context (i.e. for current() support).
   *
   * @return The current sub-expression node.
   */
  public final int getCurrentExpressionNode()
  {
    return m_currentExpressionNodes.peek();
  }

  /**
   * Set the current node that is the expression's context (i.e. for current() support).
   *
   * @param n The sub-expression node to be current.
   */
  public final void pushCurrentExpressionNode(int n)
  {
    m_currentExpressionNodes.push(n);
  }

  /**
   * Pop the current node that is the expression's context 
   * (i.e. for current() support).
   */
  public final void popCurrentExpressionNode()
  {
    m_currentExpressionNodes.quickPop(1);
  }
  
  private ObjectStack m_prefixResolvers 
                                   = new ObjectStack(RECURSIONLIMIT);