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org.apache.jcs.auxiliary.disk.block.BlockDiskElementDescriptor |
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1 | package org.apache.jcs.auxiliary.disk.block; |
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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.Externalizable; |
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23 | import java.io.IOException; |
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24 | import java.io.ObjectInput; |
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25 | import java.io.ObjectOutput; |
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26 | import java.io.Serializable; |
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27 | ||
28 | /** |
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29 | * This represents an element on disk. This is used when we persist the keys. We only store the |
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30 | * block addresses in memory. We don't need the length here, since all the blocks are the same size |
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31 | * receyle bin. |
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32 | * <p> |
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33 | * @author Aaron Smuts |
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34 | */ |
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35 | 55946 | public class BlockDiskElementDescriptor |
36 | implements Serializable, Externalizable |
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37 | { |
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38 | /** Don't change */ |
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39 | private static final long serialVersionUID = -1400659301208101411L; |
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40 | ||
41 | /** The key */ |
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42 | private Serializable key; |
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43 | ||
44 | /** The array of block numbers */ |
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45 | private int[] blocks; |
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46 | ||
47 | /** |
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48 | * @param key The key to set. |
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49 | */ |
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50 | public void setKey( Serializable key ) |
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51 | { |
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52 | 22302 | this.key = key; |
53 | 22309 | } |
54 | ||
55 | /** |
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56 | * @return Returns the key. |
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57 | */ |
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58 | public Serializable getKey() |
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59 | { |
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60 | 33649 | return key; |
61 | } |
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62 | ||
63 | /** |
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64 | * @param blocks The blocks to set. |
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65 | */ |
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66 | public void setBlocks( int[] blocks ) |
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67 | { |
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68 | 22321 | this.blocks = blocks; |
69 | 22327 | } |
70 | ||
71 | /** |
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72 | * This holds the block numbers. An item my be dispersed between multiple blocks. |
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73 | * <p> |
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74 | * @return Returns the blocks. |
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75 | */ |
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76 | public int[] getBlocks() |
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77 | { |
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78 | 33649 | return blocks; |
79 | } |
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80 | ||
81 | /** |
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82 | * For debugging. |
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83 | * <p> |
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84 | * @return Info on the descriptor. |
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85 | */ |
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86 | public String toString() |
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87 | { |
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88 | 0 | StringBuffer buf = new StringBuffer(); |
89 | 0 | buf.append( "\nBlockDiskElementDescriptor" ); |
90 | 0 | buf.append( "\n key [" + this.getKey() + "]" ); |
91 | 0 | buf.append( "\n blocks [" ); |
92 | 0 | if ( this.getBlocks() != null ) |
93 | { |
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94 | 0 | for ( int i = 0; i < blocks.length; i++ ) |
95 | { |
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96 | 0 | buf.append( this.getBlocks()[i] ); |
97 | } |
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98 | } |
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99 | 0 | buf.append( "]" ); |
100 | 0 | return buf.toString(); |
101 | } |
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102 | ||
103 | /** |
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104 | * Saves on reflection. |
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105 | * <p> |
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106 | * (non-Javadoc) |
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107 | * @see java.io.Externalizable#readExternal(java.io.ObjectInput) |
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108 | */ |
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109 | public void readExternal( ObjectInput input ) |
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110 | throws IOException, ClassNotFoundException |
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111 | { |
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112 | 33649 | this.key = (Serializable) input.readObject(); |
113 | 33649 | this.blocks = (int[]) input.readObject(); |
114 | 33649 | } |
115 | ||
116 | /** |
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117 | * Saves on reflection. |
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118 | * <p> |
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119 | * (non-Javadoc) |
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120 | * @see java.io.Externalizable#writeExternal(java.io.ObjectOutput) |
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121 | */ |
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122 | public void writeExternal( ObjectOutput output ) |
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123 | throws IOException |
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124 | { |
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125 | 22366 | output.writeObject( this.key ); |
126 | 22371 | output.writeObject( this.blocks ); |
127 | 22377 | } |
128 | } |
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