001 package org.apache.turbine.util; 002 003 004 /* 005 * Licensed to the Apache Software Foundation (ASF) under one 006 * or more contributor license agreements. See the NOTICE file 007 * distributed with this work for additional information 008 * regarding copyright ownership. The ASF licenses this file 009 * to you under the Apache License, Version 2.0 (the 010 * "License"); you may not use this file except in compliance 011 * with the License. You may obtain a copy of the License at 012 * 013 * http://www.apache.org/licenses/LICENSE-2.0 014 * 015 * Unless required by applicable law or agreed to in writing, 016 * software distributed under the License is distributed on an 017 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 018 * KIND, either express or implied. See the License for the 019 * specific language governing permissions and limitations 020 * under the License. 021 */ 022 023 024 import java.io.BufferedInputStream; 025 import java.io.BufferedOutputStream; 026 import java.io.ByteArrayInputStream; 027 import java.io.ByteArrayOutputStream; 028 import java.io.IOException; 029 import java.io.ObjectInputStream; 030 import java.io.ObjectOutputStream; 031 import java.io.Serializable; 032 import java.util.Hashtable; 033 import java.util.Map; 034 035 /** 036 * This is where common Object manipulation routines should go. 037 * 038 * @author <a href="mailto:nissim@nksystems.com">Nissim Karpenstein</a> 039 * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a> 040 * @version $Id: ObjectUtils.java 1073174 2011-02-21 22:18:45Z tv $ 041 */ 042 public abstract class ObjectUtils 043 { 044 /** 045 * Converts a hashtable to a byte array for storage/serialization. 046 * 047 * @param hash The Hashtable to convert. 048 * 049 * @return A byte[] with the converted Hashtable. 050 * 051 * @exception Exception A generic exception. 052 */ 053 public static byte[] serializeHashtable(Hashtable<String, Object> hash) 054 throws Exception 055 { 056 Hashtable<String, Serializable> saveData = 057 new Hashtable<String, Serializable>(hash.size()); 058 String key = null; 059 Object value = null; 060 byte[] byteArray = null; 061 062 for (Map.Entry<String, Object> entry : hash.entrySet()) 063 { 064 key = entry.getKey(); 065 value = entry.getValue(); 066 if (value instanceof Serializable) 067 { 068 saveData.put (key, (Serializable)value); 069 } 070 } 071 072 ByteArrayOutputStream baos = null; 073 BufferedOutputStream bos = null; 074 ObjectOutputStream out = null; 075 try 076 { 077 // These objects are closed in the finally. 078 baos = new ByteArrayOutputStream(); 079 bos = new BufferedOutputStream(baos); 080 out = new ObjectOutputStream(bos); 081 082 out.writeObject(saveData); 083 out.flush(); 084 bos.flush(); 085 086 byteArray = baos.toByteArray(); 087 } 088 finally 089 { 090 if (out != null) 091 { 092 out.close(); 093 } 094 if (bos != null) 095 { 096 bos.close(); 097 } 098 if (baos != null) 099 { 100 baos.close(); 101 } 102 } 103 return byteArray; 104 } 105 106 /** 107 * Deserializes a single object from an array of bytes. 108 * 109 * @param objectData The serialized object. 110 * 111 * @return The deserialized object, or <code>null</code> on failure. 112 */ 113 public static Object deserialize(byte[] objectData) 114 { 115 Object object = null; 116 117 if (objectData != null) 118 { 119 // These streams are closed in finally. 120 ObjectInputStream in = null; 121 ByteArrayInputStream bin = new ByteArrayInputStream(objectData); 122 BufferedInputStream bufin = new BufferedInputStream(bin); 123 124 try 125 { 126 in = new ObjectInputStream(bufin); 127 128 // If objectData has not been initialized, an 129 // exception will occur. 130 object = in.readObject(); 131 } 132 catch (Exception e) 133 { 134 // ignore 135 } 136 finally 137 { 138 try 139 { 140 if (in != null) 141 { 142 in.close(); 143 } 144 145 bufin.close(); 146 bin.close(); 147 } 148 catch (IOException e) 149 { 150 // ignore 151 } 152 } 153 } 154 return object; 155 } 156 }