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org.apache.jcs.auxiliary.disk.indexed.IndexedDiskElementDescriptor |
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1 | package org.apache.jcs.auxiliary.disk.indexed; |
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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.Serializable; |
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23 | ||
24 | /** |
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25 | * Disk objects are located by descriptor entries. These are saved on shutdown and loaded into |
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26 | * memory on startup. |
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27 | */ |
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28 | public class IndexedDiskElementDescriptor |
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29 | implements Serializable, Comparable |
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30 | { |
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31 | private static final long serialVersionUID = -3029163572847659450L; |
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32 | ||
33 | /** Position of the cache data entry on disk. */ |
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34 | long pos; |
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35 | ||
36 | /** Number of bytes the serialized form of the cache data takes. */ |
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37 | public int len; |
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38 | ||
39 | /** |
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40 | * Set the offset (i.e. position, and the size of the element) |
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41 | * <p> |
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42 | * @param pos |
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43 | * @param data |
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44 | */ |
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45 | public void init( long pos, byte[] data ) |
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46 | { |
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47 | 0 | this.pos = pos; |
48 | 0 | this.len = data.length; |
49 | 0 | } |
50 | ||
51 | /** Constructor for the DiskElementDescriptor object */ |
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52 | public IndexedDiskElementDescriptor() |
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53 | { |
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54 | 0 | super(); |
55 | 0 | } |
56 | ||
57 | /** |
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58 | * Constructs a usable disk element descriptor. |
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59 | * <p> |
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60 | * @param pos |
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61 | * @param len |
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62 | */ |
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63 | public IndexedDiskElementDescriptor( long pos, int len ) |
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64 | 245151 | { |
65 | 245156 | this.pos = pos; |
66 | 245124 | this.len = len; |
67 | 245168 | } |
68 | ||
69 | public String toString() |
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70 | { |
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71 | 8 | StringBuffer buf = new StringBuffer(); |
72 | 8 | buf.append( "[DED: " ); |
73 | 8 | buf.append( " pos = " + pos ); |
74 | 8 | buf.append( " len = " + len ); |
75 | 8 | buf.append( "]" ); |
76 | 8 | return buf.toString(); |
77 | } |
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78 | ||
79 | /** |
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80 | * Compares based on length. |
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81 | * <p> |
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82 | * @param o Object |
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83 | * @return int |
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84 | */ |
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85 | public int compareTo( Object o ) |
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86 | { |
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87 | 1068700 | if ( o == null ) |
88 | { |
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89 | 0 | return 1; |
90 | } |
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91 | ||
92 | 1069281 | int oLen = ( (IndexedDiskElementDescriptor) o ).len; |
93 | 1069323 | if ( oLen == len ) |
94 | { |
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95 | 268141 | return 0; |
96 | } |
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97 | 801066 | else if ( oLen > len ) |
98 | { |
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99 | 264132 | return -1; |
100 | } |
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101 | 536619 | else if ( oLen < len ) |
102 | { |
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103 | 536937 | return 1; |
104 | } |
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105 | 0 | return 0; |
106 | } |
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107 | } |
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