1 package org.apache.turbine.util; 2 3 /* 4 * Licensed to the Apache Software Foundation (ASF) under one 5 * or more contributor license agreements. See the NOTICE file 6 * distributed with this work for additional information 7 * regarding copyright ownership. The ASF licenses this file 8 * to you under the Apache License, Version 2.0 (the 9 * "License"); you may not use this file except in compliance 10 * with the License. You may obtain a copy of the License at 11 * 12 * http://www.apache.org/licenses/LICENSE-2.0 13 * 14 * Unless required by applicable law or agreed to in writing, 15 * software distributed under the License is distributed on an 16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 17 * KIND, either express or implied. See the License for the 18 * specific language governing permissions and limitations 19 * under the License. 20 */ 21 22 import java.io.ByteArrayInputStream; 23 import java.io.ByteArrayOutputStream; 24 import java.io.ObjectInputStream; 25 import java.io.ObjectOutputStream; 26 import java.io.Serializable; 27 import java.util.Map; 28 29 /** 30 * This is where common Object manipulation routines should go. 31 * 32 * @author <a href="mailto:nissim@nksystems.com">Nissim Karpenstein</a> 33 * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a> 34 * @version $Id$ 35 */ 36 public abstract class ObjectUtils 37 { 38 /** 39 * Converts a map to a byte array for storage/serialization. 40 * 41 * @param map The Map to convert. 42 * 43 * @return A byte[] with the converted Map. 44 * 45 * @throws Exception A generic exception. 46 */ 47 public static byte[] serializeMap(Map<String, Object> map) 48 throws Exception 49 { 50 byte[] byteArray = null; 51 52 for (Object value : map.values()) 53 { 54 if (! (value instanceof Serializable)) 55 { 56 throw new Exception("Could not serialize, value is not serializable:" + value); 57 } 58 } 59 60 try (ByteArrayOutputStream baos = new ByteArrayOutputStream(1024); 61 ObjectOutputStream out = new ObjectOutputStream(baos)) 62 { 63 out.writeObject(map); 64 out.flush(); 65 66 byteArray = baos.toByteArray(); 67 } 68 69 return byteArray; 70 } 71 72 /** 73 * Deserializes a single object from an array of bytes. 74 * 75 * @param <T> type of the object to return 76 * @param objectData The serialized object. 77 * 78 * @return The deserialized object, or <code>null</code> on failure. 79 */ 80 @SuppressWarnings("unchecked") 81 public static <T> T deserialize(byte[] objectData) 82 { 83 T object = null; 84 85 if (objectData != null) 86 { 87 try (ByteArrayInputStream bin = new ByteArrayInputStream(objectData); 88 ObjectInputStream in = new ObjectInputStream(bin)) 89 { 90 // If objectData has not been initialized, an 91 // exception will occur. 92 object = (T)in.readObject(); 93 } 94 catch (Exception e) 95 { 96 // ignore 97 } 98 } 99 100 return object; 101 } 102 }