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From d..@apache.org
Subject cvs commit: xml-rpc/src/java/org/apache/xmlrpc Invoker.java
Date Tue, 27 Aug 2002 19:20:42 GMT
dlr         2002/08/27 12:20:42

  Added:       src/java/org/apache/xmlrpc Invoker.java
  Log:
  Refactored into its own class by Andrew Evers.
  
  Revision  Changes    Path
  1.1                  xml-rpc/src/java/org/apache/xmlrpc/Invoker.java
  
  Index: Invoker.java
  ===================================================================
  package org.apache.xmlrpc;
  
  /*
   * The Apache Software License, Version 1.1
   *
   *
   * Copyright(c) 2002 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 "XML-RPC" 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 apache@apache.org.
   *
   * 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.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   */
  
  import java.lang.reflect.InvocationTargetException;
  import java.lang.reflect.Method;
  import java.util.Vector;
  
  /**
   * Introspects handlers using Java Reflection to call methods matching
   * a XML-RPC call.
   *
   * @author <a href="mailto:hannes@apache.org">Hannes Wallnoefer</a>
   * @author <a href="mailto:dlr@finemaltcoding.com">Daniel Rall</a>
   * @author <a href="mailto:andrew@kungfoocoder.org">Andrew Evers</a>
   */
  public class Invoker implements XmlRpcHandler
  {
      private Object invokeTarget;
      private Class targetClass;
  
      public Invoker(Object target)
      {
          invokeTarget = target;
          targetClass = (invokeTarget instanceof Class) ? (Class) invokeTarget :
                  invokeTarget.getClass();
          if (XmlRpc.debug)
          {
              System.out.println("Target object is " + targetClass);
          }
      }
  
      /**
       * main method, sucht methode in object, wenn gefunden dann aufrufen.
       */
      public Object execute(String methodName, Vector params) throws Exception
      {
          // Array mit Classtype bilden, ObjectAry mit Values bilden
          Class[] argClasses = null;
          Object[] argValues = null;
          if (params != null)
          {
              argClasses = new Class[params.size()];
              argValues = new Object[params.size()];
              for (int i = 0; i < params.size(); i++)
              {
                  argValues[i] = params.elementAt(i);
                  if (argValues[i] instanceof Integer)
                  {
                      argClasses[i] = Integer.TYPE;
                  }
                  else if (argValues[i] instanceof Double)
                  {
                      argClasses[i] = Double.TYPE;
                  }
                  else if (argValues[i] instanceof Boolean)
                  {
                      argClasses[i] = Boolean.TYPE;
                  }
                  else
                  {
                      argClasses[i] = argValues[i].getClass();
                  }
              }
          }
  
          // Methode da ?
          Method method = null;
  
          // The last element of the XML-RPC method name is the Java
          // method name.
          int dot = methodName.lastIndexOf('.');
          if (dot > -1 && dot + 1 < methodName.length())
          {
              methodName = methodName.substring(dot + 1);
          }
  
          if (XmlRpc.debug)
          {
              System.out.println("Searching for method: " + methodName +
                                 " in class " + targetClass.getName());
              for (int i = 0; i < argClasses.length; i++)
              {
                  System.out.println("Parameter " + i + ": " + argValues[i]
                          + " (" + argClasses[i] + ')');
              }
          }
  
          try
          {
              method = targetClass.getMethod(methodName, argClasses);
          }
          // Wenn nicht da dann entsprechende Exception returnen
          catch(NoSuchMethodException nsm_e)
          {
              throw nsm_e;
          }
          catch(SecurityException s_e)
          {
              throw s_e;
          }
  
          // Our policy is to make all public methods callable except
          // the ones defined in java.lang.Object.
          if (method.getDeclaringClass() == Object.class)
          {
              throw new XmlRpcException(0, "Invoker can't call methods "
                      + "defined in java.lang.Object");
          }
  
          // invoke
          Object returnValue = null;
          try
          {
              returnValue = method.invoke(invokeTarget, argValues);
          }
          catch(IllegalAccessException iacc_e)
          {
              throw iacc_e;
          }
          catch(IllegalArgumentException iarg_e)
          {
              throw iarg_e;
          }
          catch(InvocationTargetException it_e)
          {
              if (XmlRpc.debug)
              {
                  it_e.getTargetException().printStackTrace();
              }
              // check whether the thrown exception is XmlRpcException
              Throwable t = it_e.getTargetException();
              if (t instanceof XmlRpcException)
              {
                  throw (XmlRpcException) t;
              }
              // It is some other exception
              throw new Exception(t.toString());
          }
          if (returnValue == null && method.getReturnType() == Void.TYPE)
          {
              // Not supported by the spec.
              throw new IllegalArgumentException
                  ("void return types for handler methods not supported");
          }
          return returnValue;
      }
  }
  
  
  

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