Package org.strecks.dispatch.internal

Source Code of org.strecks.dispatch.internal.DispatchControllerHelper

/*
* Copyright 2005-2006 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
* in compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License
* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
* or implied. See the License for the specific language governing permissions and limitations under
* the License.
*/

package org.strecks.dispatch.internal;

import java.lang.reflect.Method;
import java.util.HashMap;

import org.apache.struts.action.ActionMapping;
import org.strecks.exceptions.ApplicationConfigurationException;
import org.strecks.util.ReflectHelper;

/**
* Class used internally by <code>BasicDispatchController</code> and <code>NavigableDispatchController</code> to
* store method name to method mappings, and other tasks
* @author Phil Zoio
*/
public class DispatchControllerHelper
{

  /**
   * The set of Method objects we have introspected for this class, keyed by method name. This collection is populated
   * as different methods are called, so that introspection needs to occur only once per method name.
   */
  protected HashMap<String, Method> methods = new HashMap<String, Method>();

  public void checkParameterName(ActionMapping mapping, String parameterName)
  {
    if (parameterName == null)
    {
      throw new ApplicationConfigurationException(
          "The element 'parameter' is required to determine the method name, and is required in required in path "
              + mapping.getPath());
    }
  }

  public Method getMethod(Object actionBean, String methodName)
  {
    synchronized (methods)
    {
      Method method = methods.get(methodName);
      if (method == null)
      {
        method = ReflectHelper.getMethod(actionBean, methodName);
        methods.put(methodName, method);
      }
      return method;
    }
  }
}
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