1 package org.apache.turbine.util;
2
3
4 /*
5 * Licensed to the Apache Software Foundation (ASF) under one
6 * or more contributor license agreements. See the NOTICE file
7 * distributed with this work for additional information
8 * regarding copyright ownership. The ASF licenses this file
9 * to you under the Apache License, Version 2.0 (the
10 * "License"); you may not use this file except in compliance
11 * with the License. You may obtain a copy of the License at
12 *
13 * http://www.apache.org/licenses/LICENSE-2.0
14 *
15 * Unless required by applicable law or agreed to in writing,
16 * software distributed under the License is distributed on an
17 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
18 * KIND, either express or implied. See the License for the
19 * specific language governing permissions and limitations
20 * under the License.
21 */
22
23
24 import java.io.BufferedInputStream;
25 import java.io.BufferedOutputStream;
26 import java.io.ByteArrayInputStream;
27 import java.io.ByteArrayOutputStream;
28 import java.io.IOException;
29 import java.io.ObjectInputStream;
30 import java.io.ObjectOutputStream;
31 import java.io.Serializable;
32 import java.util.Hashtable;
33 import java.util.Map;
34
35 /**
36 * This is where common Object manipulation routines should go.
37 *
38 * @author <a href="mailto:nissim@nksystems.com">Nissim Karpenstein</a>
39 * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a>
40 * @version $Id: ObjectUtils.java 1524160 2013-09-17 18:37:14Z tv $
41 */
42 public abstract class ObjectUtils
43 {
44 /**
45 * Converts a map to a byte array for storage/serialization.
46 *
47 * @param map The Map to convert.
48 *
49 * @return A byte[] with the converted Map.
50 *
51 * @exception Exception A generic exception.
52 */
53 public static byte[] serializeMap(Map<String, Object> map)
54 throws Exception
55 {
56 Map<String, Serializable> saveData =
57 new Hashtable<String, Serializable>(map.size());
58 String key = null;
59 Object value = null;
60 byte[] byteArray = null;
61
62 for (Map.Entry<String, Object> entry : map.entrySet())
63 {
64 key = entry.getKey();
65 value = entry.getValue();
66 if (value instanceof Serializable)
67 {
68 saveData.put (key, (Serializable)value);
69 }
70 }
71
72 ByteArrayOutputStream baos = null;
73 BufferedOutputStream bos = null;
74 ObjectOutputStream out = null;
75 try
76 {
77 // These objects are closed in the finally.
78 baos = new ByteArrayOutputStream();
79 bos = new BufferedOutputStream(baos);
80 out = new ObjectOutputStream(bos);
81
82 out.writeObject(saveData);
83 out.flush();
84 bos.flush();
85
86 byteArray = baos.toByteArray();
87 }
88 finally
89 {
90 if (out != null)
91 {
92 out.close();
93 }
94 if (bos != null)
95 {
96 bos.close();
97 }
98 if (baos != null)
99 {
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 @SuppressWarnings("unchecked")
114 public static <T> T deserialize(byte[] objectData)
115 {
116 T object = null;
117
118 if (objectData != null)
119 {
120 // These streams are closed in finally.
121 ObjectInputStream in = null;
122 ByteArrayInputStream bin = new ByteArrayInputStream(objectData);
123 BufferedInputStream bufin = new BufferedInputStream(bin);
124
125 try
126 {
127 in = new ObjectInputStream(bufin);
128
129 // If objectData has not been initialized, an
130 // exception will occur.
131 object = (T)in.readObject();
132 }
133 catch (Exception e)
134 {
135 // ignore
136 }
137 finally
138 {
139 try
140 {
141 if (in != null)
142 {
143 in.close();
144 }
145
146 bufin.close();
147 bin.close();
148 }
149 catch (IOException e)
150 {
151 // ignore
152 }
153 }
154 }
155 return object;
156 }
157 }