extensionhandlerjavapackage.java

来自「java jdk 1.4的源码」· Java 代码 · 共 508 行 · 第 1/2 页

    Object[] methodArgs;
    Object[][] convertedArgs;
    Class[] paramTypes;

    try
    {

      if (funcName.endsWith(".new")) {                   // Handle constructor call

        methodArgs = new Object[args.size()];
        convertedArgs = new Object[1][];
        for (int i = 0; i < methodArgs.length; i++)
        {
          methodArgs[i] = args.elementAt(i);
        }
        Constructor c = (Constructor) getFromCache(methodKey, null, methodArgs);
        if (c != null)
        {
          try
          {
            paramTypes = c.getParameterTypes();
            MethodResolver.convertParams(methodArgs, convertedArgs, paramTypes, exprContext);
            return c.newInstance(convertedArgs[0]);
          }
          catch (InvocationTargetException ite)
          {
            throw ite;
          }
          catch(Exception e)
          {
            // Must not have been the right one
          }
        }
        className = m_className + funcName.substring(0, lastDot);
        try
        {
          classObj = getClassForName(className);
        }
        catch (ClassNotFoundException e) 
        {
          throw new TransformerException(e);
        }
        c = MethodResolver.getConstructor(classObj, 
                                          methodArgs,
                                          convertedArgs,
                                          exprContext);
        putToCache(methodKey, null, methodArgs, c);
        return c.newInstance(convertedArgs[0]);
      }

      else if (-1 != lastDot) {                         // Handle static method call

        methodArgs = new Object[args.size()];
        convertedArgs = new Object[1][];
        for (int i = 0; i < methodArgs.length; i++)
        {
          methodArgs[i] = args.elementAt(i);
        }
        Method m = (Method) getFromCache(methodKey, null, methodArgs);
        if (m != null)
        {
          try
          {
            paramTypes = m.getParameterTypes();
            MethodResolver.convertParams(methodArgs, convertedArgs, paramTypes, exprContext);
            return m.invoke(null, convertedArgs[0]);
          }
          catch (InvocationTargetException ite)
          {
            throw ite;
          }
          catch(Exception e)
          {
            // Must not have been the right one
          }
        }
        className = m_className + funcName.substring(0, lastDot);
        methodName = funcName.substring(lastDot + 1);
        try
        {
          classObj = getClassForName(className);
        }
        catch (ClassNotFoundException e) 
        {
          throw new TransformerException(e);
        }
        m = MethodResolver.getMethod(classObj,
                                     methodName,
                                     methodArgs, 
                                     convertedArgs,
                                     exprContext,
                                     MethodResolver.STATIC_ONLY);
        putToCache(methodKey, null, methodArgs, m);
        return m.invoke(null, convertedArgs[0]);
      }

      else {                                            // Handle instance method call

        if (args.size() < 1)
        {
          throw new TransformerException(XSLMessages.createMessage(XSLTErrorResources.ER_INSTANCE_MTHD_CALL_REQUIRES, new Object[]{funcName })); //"Instance method call to method " + funcName
                                    //+ " requires an Object instance as first argument");
        }
        targetObject = args.elementAt(0);
        if (targetObject instanceof XObject)          // Next level down for XObjects
          targetObject = ((XObject) targetObject).object();
        methodArgs = new Object[args.size() - 1];
        convertedArgs = new Object[1][];
        for (int i = 0; i < methodArgs.length; i++)
        {
          methodArgs[i] = args.elementAt(i+1);
        }
        Method m = (Method) getFromCache(methodKey, targetObject, methodArgs);
        if (m != null)
        {
          try
          {
            paramTypes = m.getParameterTypes();
            MethodResolver.convertParams(methodArgs, convertedArgs, paramTypes, exprContext);
            return m.invoke(targetObject, convertedArgs[0]);
          }
          catch (InvocationTargetException ite)
          {
            throw ite;
          }
          catch(Exception e)
          {
            // Must not have been the right one
          }
        }
        classObj = targetObject.getClass();
        m = MethodResolver.getMethod(classObj,
                                     funcName,
                                     methodArgs, 
                                     convertedArgs,
                                     exprContext,
                                     MethodResolver.INSTANCE_ONLY);
        putToCache(methodKey, targetObject, methodArgs, m);
        return m.invoke(targetObject, convertedArgs[0]);
      }
    }
    catch (InvocationTargetException ite)
    {
      Throwable resultException = ite;
      Throwable targetException = ite.getTargetException();
 
      if (targetException instanceof TransformerException)
        throw ((TransformerException)targetException);
      else if (targetException != null)
        resultException = targetException;
            
      throw new TransformerException(resultException);
    }
    catch (Exception e)
    {
      // e.printStackTrace();
      throw new TransformerException(e);
    }
  }


  /**
   * Process a call to this extension namespace via an element. As a side
   * effect, the results are sent to the TransformerImpl's result tree.
   * For this namespace, only static element methods are currently supported.
   * If instance methods are needed, please let us know your requirements.
   * @param localPart      Element name's local part.
   * @param element        The extension element being processed.
   * @param transformer      Handle to TransformerImpl.
   * @param stylesheetTree The compiled stylesheet tree.
   * @param mode           The current mode.
   * @param sourceTree     The root of the source tree (but don't assume
   *                       it's a Document).
   * @param sourceNode     The current context node.
   * @param mode           The current mode.
   * @param methodKey      A key that uniquely identifies this element call.
   * @throws IOException           if loading trouble
   * @throws TransformerException          if parsing trouble
   */

  public void processElement (String localPart,
                              ElemTemplateElement element,
                              TransformerImpl transformer,
                              Stylesheet stylesheetTree,
                              Object methodKey)
    throws TransformerException, IOException
  {
    Object result = null;
    Class classObj;

    Method m = (Method) getFromCache(methodKey, null, null);
    if (null == m)
    {
      try
      {
        String fullName = m_className + localPart;
        int lastDot = fullName.lastIndexOf(".");
        if (lastDot < 0)
          throw new TransformerException(XSLMessages.createMessage(XSLTErrorResources.ER_INVALID_ELEMENT_NAME, new Object[]{fullName })); //"Invalid element name specified " + fullName);
        try
        {
          classObj = getClassForName(fullName.substring(0, lastDot));
        }
        catch (ClassNotFoundException e) 
        {
          throw new TransformerException(e);
        }
        localPart = fullName.substring(lastDot + 1);
        m = MethodResolver.getElementMethod(classObj, localPart);
        if (!Modifier.isStatic(m.getModifiers()))
          throw new TransformerException(XSLMessages.createMessage(XSLTErrorResources.ER_ELEMENT_NAME_METHOD_STATIC, new Object[]{fullName })); //"Element name method must be static " + fullName);
      }
      catch (Exception e)
      {
        // e.printStackTrace ();
        throw new TransformerException (e);
      }
      putToCache(methodKey, null, null, m);
    }

    XSLProcessorContext xpc = new XSLProcessorContext(transformer, 
                                                      stylesheetTree);

    try
    {
      result = m.invoke(null, new Object[] {xpc, element});
    }
    catch (InvocationTargetException ite)
    {
      Throwable resultException = ite;
      Throwable targetException = ite.getTargetException();
 
      if (targetException instanceof TransformerException)
        throw ((TransformerException)targetException);
      else if (targetException != null)
        resultException = targetException;
            
      throw new TransformerException(resultException);
    }
    catch (Exception e)
    {
      // e.printStackTrace ();
      throw new TransformerException (e);
    }

    if (result != null)
    {
      xpc.outputToResultTree (stylesheetTree, result);
    }
 
  }

}