001package org.apache.turbine.util; 002 003/* 004 * Licensed to the Apache Software Foundation (ASF) under one 005 * or more contributor license agreements. See the NOTICE file 006 * distributed with this work for additional information 007 * regarding copyright ownership. The ASF licenses this file 008 * to you under the Apache License, Version 2.0 (the 009 * "License"); you may not use this file except in compliance 010 * with the License. You may obtain a copy of the License at 011 * 012 * http://www.apache.org/licenses/LICENSE-2.0 013 * 014 * Unless required by applicable law or agreed to in writing, 015 * software distributed under the License is distributed on an 016 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 017 * KIND, either express or implied. See the License for the 018 * specific language governing permissions and limitations 019 * under the License. 020 */ 021 022import java.io.ByteArrayInputStream; 023import java.io.ByteArrayOutputStream; 024import java.io.IOException; 025import java.io.ObjectInputStream; 026import java.io.ObjectOutputStream; 027import java.io.Serializable; 028import java.util.Map; 029 030/** 031 * This is where common Object manipulation routines should go. 032 * 033 * @author <a href="mailto:nissim@nksystems.com">Nissim Karpenstein</a> 034 * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a> 035 * @version $Id: ObjectUtils.java 1812628 2017-10-19 12:34:25Z gk $ 036 */ 037public abstract class ObjectUtils 038{ 039 /** 040 * Converts a map to a byte array for storage/serialization. 041 * 042 * @param map The Map to convert. 043 * 044 * @return A byte[] with the converted Map. 045 * 046 * @throws Exception A generic exception. 047 */ 048 public static byte[] serializeMap(Map<String, Object> map) 049 throws Exception 050 { 051 byte[] byteArray = null; 052 053 for (Object value : map.values()) 054 { 055 if (! (value instanceof Serializable)) 056 { 057 throw new Exception("Could not serialize, value is not serializable:" + value); 058 } 059 } 060 061 ByteArrayOutputStream baos = null; 062 ObjectOutputStream out = null; 063 try 064 { 065 // These objects are closed in the finally. 066 baos = new ByteArrayOutputStream(1024); 067 out = new ObjectOutputStream(baos); 068 069 out.writeObject(map); 070 out.flush(); 071 072 byteArray = baos.toByteArray(); 073 } 074 finally 075 { 076 if (out != null) 077 { 078 out.close(); 079 } 080 if (baos != null) 081 { 082 baos.close(); 083 } 084 } 085 086 return byteArray; 087 } 088 089 /** 090 * Deserializes a single object from an array of bytes. 091 * 092 * @param objectData The serialized object. 093 * 094 * @return The deserialized object, or <code>null</code> on failure. 095 */ 096 @SuppressWarnings("unchecked") 097 public static <T> T deserialize(byte[] objectData) 098 { 099 T object = null; 100 101 if (objectData != null) 102 { 103 // These streams are closed in finally. 104 ObjectInputStream in = null; 105 ByteArrayInputStream bin = new ByteArrayInputStream(objectData); 106 107 try 108 { 109 in = new ObjectInputStream(bin); 110 111 // If objectData has not been initialized, an 112 // exception will occur. 113 object = (T)in.readObject(); 114 } 115 catch (Exception e) 116 { 117 // ignore 118 } 119 finally 120 { 121 try 122 { 123 if (in != null) 124 { 125 in.close(); 126 } 127 bin.close(); 128 } 129 catch (IOException e) 130 { 131 // ignore 132 } 133 } 134 } 135 return object; 136 } 137}