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org.apache.jcs.utils.serialization.SerializationConversionUtil |
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1 | package org.apache.jcs.utils.serialization; |
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2 | ||
3 | /* |
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4 | * Licensed to the Apache Software Foundation (ASF) under one |
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5 | * or more contributor license agreements. See the NOTICE file |
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6 | * distributed with this work for additional information |
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7 | * regarding copyright ownership. The ASF licenses this file |
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8 | * to you under the Apache License, Version 2.0 (the |
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9 | * "License"); you may not use this file except in compliance |
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10 | * with the License. You may obtain a copy of the License at |
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11 | * |
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12 | * http://www.apache.org/licenses/LICENSE-2.0 |
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13 | * |
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14 | * Unless required by applicable law or agreed to in writing, |
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15 | * software distributed under the License is distributed on an |
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16 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
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17 | * KIND, either express or implied. See the License for the |
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18 | * specific language governing permissions and limitations |
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19 | * under the License. |
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20 | */ |
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21 | ||
22 | import java.io.IOException; |
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23 | ||
24 | import org.apache.commons.logging.Log; |
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25 | import org.apache.commons.logging.LogFactory; |
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26 | import org.apache.jcs.engine.CacheElement; |
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27 | import org.apache.jcs.engine.CacheElementSerialized; |
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28 | import org.apache.jcs.engine.behavior.ICacheElement; |
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29 | import org.apache.jcs.engine.behavior.ICacheElementSerialized; |
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30 | import org.apache.jcs.engine.behavior.IElementSerializer; |
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31 | ||
32 | /** |
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33 | * This uses a supplied Serialer to convert to and from cache elements. |
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34 | * <p> |
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35 | * @author Aaron Smuts |
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36 | */ |
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37 | 1 | public class SerializationConversionUtil |
38 | { |
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39 | 57 | private final static Log log = LogFactory.getLog( SerializationConversionUtil.class ); |
40 | ||
41 | /** |
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42 | * This returns a wrapper that has a serialized version of the value instead |
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43 | * of the value. |
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44 | * <p> |
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45 | * @param element |
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46 | * @param elementSerializer |
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47 | * the serializer to be used. |
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48 | * @return null for null; |
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49 | * @throws IOException |
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50 | */ |
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51 | public static ICacheElementSerialized getSerializedCacheElement( ICacheElement element, |
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52 | IElementSerializer elementSerializer ) |
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53 | throws IOException |
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54 | { |
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55 | 751 | if ( element == null ) |
56 | { |
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57 | 0 | return null; |
58 | } |
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59 | ||
60 | 751 | byte[] serialzedValue = null; |
61 | ||
62 | // if it has already been serialized, don't do it again. |
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63 | 751 | if ( element instanceof ICacheElementSerialized ) |
64 | { |
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65 | 0 | serialzedValue = ( (ICacheElementSerialized) element ).getSerializedValue(); |
66 | 0 | } |
67 | else |
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68 | { |
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69 | 751 | if ( elementSerializer != null ) |
70 | { |
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71 | try |
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72 | { |
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73 | 743 | serialzedValue = elementSerializer.serialize( element.getVal() ); |
74 | } |
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75 | 0 | catch ( IOException e ) |
76 | { |
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77 | 0 | log.error( "Problem serializing object.", e ); |
78 | 0 | throw e; |
79 | 742 | } |
80 | } |
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81 | else |
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82 | { |
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83 | // we could just use the default. |
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84 | 8 | log.warn( "ElementSerializer is null. Could not serialize object." ); |
85 | 8 | throw new IOException( "Could not serialize object. The ElementSerializer is null." ); |
86 | } |
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87 | } |
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88 | 744 | ICacheElementSerialized serialized = new CacheElementSerialized( element.getCacheName(), element.getKey(), |
89 | 1 | serialzedValue, element.getElementAttributes() ); |
90 | ||
91 | 743 | return serialized; |
92 | } |
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93 | ||
94 | /** |
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95 | * This returns a wrapper that has a de-serialized version of the value |
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96 | * instead of the serialized value. |
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97 | * <p> |
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98 | * @param serialized |
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99 | * @param elementSerializer |
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100 | * the serializer to be used. |
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101 | * @return null for null; |
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102 | * @throws IOException |
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103 | * @throws ClassNotFoundException |
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104 | */ |
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105 | public static ICacheElement getDeSerializedCacheElement( ICacheElementSerialized serialized, |
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106 | IElementSerializer elementSerializer ) |
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107 | throws IOException, ClassNotFoundException |
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108 | { |
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109 | 43 | if ( serialized == null ) |
110 | { |
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111 | 0 | return null; |
112 | } |
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113 | ||
114 | 43 | Object deSerialzedValue = null; |
115 | ||
116 | 43 | if ( elementSerializer != null ) |
117 | { |
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118 | try |
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119 | { |
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120 | try |
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121 | { |
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122 | 43 | deSerialzedValue = elementSerializer.deSerialize( serialized.getSerializedValue() ); |
123 | } |
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124 | 0 | catch ( ClassNotFoundException e ) |
125 | { |
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126 | 0 | log.error( "Problem de-serializing object.", e ); |
127 | 0 | throw e; |
128 | 42 | } |
129 | } |
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130 | 0 | catch ( IOException e ) |
131 | { |
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132 | 0 | log.error( "Problem de-serializing object.", e ); |
133 | 0 | throw e; |
134 | 42 | } |
135 | } |
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136 | else |
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137 | { |
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138 | // we could just use the default. |
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139 | 0 | log.warn( "ElementSerializer is null. Could not serialize object." ); |
140 | } |
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141 | 43 | ICacheElement deSerialized = new CacheElement( serialized.getCacheName(), serialized.getKey(), deSerialzedValue ); |
142 | 43 | deSerialized.setElementAttributes( serialized.getElementAttributes() ); |
143 | ||
144 | 43 | return deSerialized; |
145 | } |
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146 | } |
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