/*

  * Copyright 2006-2008 The Kuali Foundation

  * 

  * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php

  * 

  * 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.kuali.rice.kns.util.cache;

 import java.io.IOException;

 import java.io.ObjectInputStream;

 import java.io.ObjectOutputStream;

 import java.io.Serializable;

 /**

  * Container class to simplify getting both a deepCopied object and its size returned from a single call to deepCopy.

  */

 public class CopiedObject<T extends Serializable> {

     //private Serializable content;

     private byte[] content;

     private int size;

     private int oldSize;

     public CopiedObject() {

         oldSize = -1;

     }

     public CopiedObject( T cacheableObject ) {

         oldSize = -1;

         setContent( cacheableObject );

     }

     /**

      * @return current value of bytes.

      */

     public int getSize() {

         return size;

     }

     /**

      * @return current value of cacheableObject.

      */

     public T getContent() {

         T copy = null;

         if (content != null) {

             ObjectInputStream ois = null;

             try {

                 FastByteArrayInputStream deserializer = new FastByteArrayInputStream(content,size);

                 ois = new ObjectInputStream(deserializer);

                 copy = (T) ois.readObject();

             }

             catch (IOException e) {

                 throw new CacheException("unable to complete getContent()", e);

             }

             catch (ClassNotFoundException e) {

                 throw new CacheException("unable to complete getContent()", e);

             }

             finally {

                 try {

                     if (ois != null) {

                         ois.close();

                     }

                 }

                 catch (IOException e) {

                     // ignoring this IOException, since the streams are going to be abandoned now anyway

                 }

             }

         }

         return copy;

     }

     /**

      * Sets the cacheableObject attribute value.

      * 

      * @param cacheableObject The cacheableObject to set.

      */

     public void setContent(T cacheableObject) {

         int copySize = 0;

         if (cacheableObject != null) {

             ObjectOutputStream oos = null;

             try {

                 FastByteArrayOutputStream serializer = new FastByteArrayOutputStream();

                 oos = new ObjectOutputStream(serializer);

                 oos.writeObject(cacheableObject);

                 if ( content != null ) {

                     oldSize = size;

                 }

                 size = serializer.getSize();

                 content = serializer.getByteArray();

             } catch (IOException e) {

                 throw new CacheException("unable to complete deepCopy from src '" + cacheableObject.toString() + "'", e);

             }

             finally {

                 try {

                     if (oos != null) {

                         oos.close();

                     }

                 } catch (IOException e) {

                     // ignoring this IOException, since the streams are going to be abandoned now anyway

                 }

             }

         }

     }

     /**

      * @return current value of oldSize.

      */

     public int getOldSize() {

         return oldSize;

     }

 }