Package de.petris.dynamicaspects.wrapper

Source Code of de.petris.dynamicaspects.wrapper.ExecutionMapper

/*
* Copyright (c) 2004, Marco Petris
* All rights reserved.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*     - Redistributions of source code must retain the above copyright notice,
*       this list of conditions and the following disclaimer.
*     - 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.
*     - Neither the name of Marco Petris nor the names of its
*       contributors may be used to endorse or promote products derived from
*       this software without specific prior written permission.
*      
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS 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 COPYRIGHT OWNER OR 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.
*/
package de.petris.dynamicaspects.wrapper;

import java.util.HashMap;
import java.util.Map;

import de.petris.dynamicaspects.classhandler.ClassHandler;
import de.petris.dynamicaspects.classhandler.ExecutionClassHandler;


/**
* This class is patched into the matching methods of the target class.
* If a woven method of the target class is called the mapper returns the
* correct wrapper for the method. The wrapper
* {@link ExecutionWrapper ExecutionWrapper} then handles the aspects.
* This mapper handles the mapping of target classes and class handlers.
*
* @author Marco Petris
*
* @see ExecutionWrapper
* @see ExecutionClassHandler
* @see de.petris.dynamicaspects.BeforeAfterAdvice
* @see de.petris.dynamicaspects.WeaveType
*/
public class ExecutionMapper {
 
  /**
   * This method is called during runtime to get the wrapper for the
   * executing method.
   */
  static String GETWRAPPER_METHODNAME = "getWrapper";

  // a mapping: targetclass name -> classhandler
    private static Map<String, ExecutionClassHandler> executionHandlers
     = new HashMap<String, ExecutionClassHandler>();

    /**
     * Called by {@link de.petris.dynamicaspects.WeaveType WeaveType.EXECUTION}
     * to obtain the corresponding handler for a target class. If the class has
     * no handler yet a handler is created.
     *
     * @param targetClassName the name of the target class
     * @return the handler for the target class
     */
    public static ClassHandler getClassHandler( String targetClassName ) {
     
      if( executionHandlers.containsKey( targetClassName ) ) {
        return executionHandlers.get( targetClassName );
      }
      else {
        ExecutionClassHandler cHandler = new ExecutionClassHandler();
        executionHandlers.put( targetClassName, cHandler );
        return cHandler;
      }
    }
   
    /**
     * Called to handle the advices. The target method calls this method to
     * load its wrapper and leave advice handling to this wrapper.
     * This method is not for normal programming use.
     *
     * @param targetClassName the classname of the target class.
     * @param fullMethodName the method name which is executing.
     * @return the wrapper for the given class/method
     */
    public static ExecutionWrapper getWrapper(
        String targetClassName, String fullMethodName ) {
      ExecutionClassHandler cHandler
      = executionHandlers.get( targetClassName );
     
      return cHandler.getExecutionWrapper( fullMethodName );
    }
   
}
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