Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||||||
IdentitySet |
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| 1.0;1 |
1 | /* |
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2 | $Id$ |
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3 | ||
4 | Copyright 2005 Elliotte Rusty Harold. All Rights Reserved. |
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5 | |
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6 | Redistribution and use of this software and associated documentation |
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7 | ("Software"), with or without modification, are permitted provided |
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8 | that the following conditions are met: |
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9 | ||
10 | 1. Redistributions of source code must retain copyright |
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11 | statements and notices. Redistributions must also contain a |
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12 | copy of this document. |
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13 | |
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14 | 2. Redistributions in binary form must reproduce the |
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15 | above copyright notice, this list of conditions and the |
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16 | following disclaimer in the documentation and/or other |
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17 | materials provided with the distribution. |
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18 | |
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19 | 3. The name "jaxen" must not be used to endorse or promote |
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20 | products derived from this Software without prior written |
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21 | permission of The Werken Company. For written permission, |
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22 | please contact bob@werken.com. |
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23 | |
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24 | 4. Products derived from this Software may not be called "jaxen" |
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25 | nor may "jaxen" appear in their names without prior written |
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26 | permission of The Werken Company. "jaxen" is a registered |
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27 | trademark of The Werken Company. |
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28 | |
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29 | 5. Due credit should be given to The Werken Company. |
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30 | (http://jaxen.werken.com/). |
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31 | |
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32 | THIS SOFTWARE IS PROVIDED BY THE WERKEN COMPANY AND CONTRIBUTORS |
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33 | ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT |
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34 | NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND |
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35 | FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL |
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36 | THE WERKEN COMPANY OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, |
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37 | INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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38 | (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
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39 | SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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40 | HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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41 | STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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42 | ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
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43 | OF THE POSSIBILITY OF SUCH DAMAGE. |
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44 | ||
45 | */ |
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46 | package org.jaxen.expr; |
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47 | ||
48 | import java.util.HashSet; |
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49 | ||
50 | ||
51 | /** |
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52 | * <p> |
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53 | * This is a set that uses identity rather than equality semantics. |
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54 | * </p> |
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55 | * |
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56 | * @author Elliotte Rusty Harold |
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57 | * |
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58 | */ |
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59 | final class IdentitySet { |
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60 | ||
61 | 4452 | private HashSet contents = new HashSet(); |
62 | ||
63 | IdentitySet() { |
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64 | 4452 | super(); |
65 | 4452 | } |
66 | ||
67 | void add(Object object) { |
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68 | 134136 | IdentityWrapper wrapper = new IdentityWrapper(object); |
69 | 134136 | contents.add(wrapper); |
70 | 134136 | } |
71 | ||
72 | public boolean contains(Object object) { |
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73 | 139308 | IdentityWrapper wrapper = new IdentityWrapper(object); |
74 | 139308 | return contents.contains(wrapper); |
75 | } |
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76 | ||
77 | private static class IdentityWrapper { |
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78 | ||
79 | private Object object; |
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80 | ||
81 | 273444 | IdentityWrapper(Object object) { |
82 | 273444 | this.object = object; |
83 | 273444 | } |
84 | ||
85 | public boolean equals(Object o) { |
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86 | 84 | IdentityWrapper w = (IdentityWrapper) o; |
87 | 84 | return object == w.object; |
88 | } |
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89 | ||
90 | public int hashCode() { |
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91 | 273444 | return System.identityHashCode(object); |
92 | } |
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93 | ||
94 | } |
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95 | ||
96 | ||
97 | } |