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    1   //========================================================================
    2   //$Id: PreDestroyCallback.java 1540 2007-01-19 12:24:10Z janb $
    3   //Copyright 2006 Mort Bay Consulting Pty. Ltd.
    4   //------------------------------------------------------------------------
    5   //Licensed under the Apache License, Version 2.0 (the "License");
    6   //you may not use this file except in compliance with the License.
    7   //You may obtain a copy of the License at
    8   //http://www.apache.org/licenses/LICENSE-2.0
    9   //Unless required by applicable law or agreed to in writing, software
    10  //distributed under the License is distributed on an "AS IS" BASIS,
    11  //WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  //See the License for the specific language governing permissions and
    13  //limitations under the License.
    14  //========================================================================
    15
    16  package org.mortbay.jetty.plus.annotation;
    17
    18  import java.lang.reflect.Method;
    19  import java.lang.reflect.Modifier;
    20
    21  import org.mortbay.log.Log;
    22
    23  /**
    24   * PreDestroyCallback
    25   *
    26   *
    27   */
    28  public class PreDestroyCallback extends LifeCycleCallback
    29  {
    30
    31      /**
    32       * Commons Annotations Specification section 2.6:
    33       * - no params to method
    34       * - returns void
    35       * - no checked exceptions
    36       * - not static
    37       * @see org.mortbay.jetty.plus.annotation.LifeCycleCallback#validate(java.lang.Class, java.lang.reflect.Method)
    38       */
    39      public void validate(Class clazz, Method method)
    40      {
    41
    42          if (method.getExceptionTypes().length > 0)
    43              throw new IllegalArgumentException(clazz.getName()+"."+method.getName()+ " cannot not throw a checked exception");
    44
    45          if (!method.getReturnType().equals(Void.TYPE))
    46              throw new IllegalArgumentException(clazz.getName()+"."+method.getName()+ " cannot not have a return type");
    47
    48          if (Modifier.isStatic(method.getModifiers()))
    49              throw new IllegalArgumentException(clazz.getName()+"."+method.getName()+ " cannot be static");
    50
    51      }
    52
    53
    54      public void callback(Object instance)
    55      {
    56          try
    57          {
    58              super.callback(instance);
    59          }
    60          catch (Exception e)
    61          {
    62              Log.warn("Ignoring exception thrown on preDestroy call to "+getTargetClass()+"."+getTarget().getName(), e);
    63          }
    64      }
    65
    66      public boolean equals(Object o)
    67      {
    68          if (super.equals(o) && (o instanceof PreDestroyCallback))
    69              return true;
    70          return false;
    71      }
    72  }