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1 /*--
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2
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3 $Id: NegateFilter.java,v 1.4 2007/11/10 05:29:00 jhunter Exp $
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4
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5 Copyright (C) 2000-2007 Jason Hunter & Brett McLaughlin.
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6 All rights reserved.
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7
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8 Redistribution and use in source and binary forms, with or without
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9 modification, are permitted provided that the following conditions
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10 are met:
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11
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12 1. Redistributions of source code must retain the above copyright
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13 notice, this list of conditions, and the following disclaimer.
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14
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15 2. Redistributions in binary form must reproduce the above copyright
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16 notice, this list of conditions, and the disclaimer that follows
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17 these conditions in the documentation and/or other materials
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18 provided with the distribution.
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19
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20 3. The name "JDOM" must not be used to endorse or promote products
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21 derived from this software without prior written permission. For
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22 written permission, please contact <request_AT_jdom_DOT_org>.
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23
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24 4. Products derived from this software may not be called "JDOM", nor
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25 may "JDOM" appear in their name, without prior written permission
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26 from the JDOM Project Management <request_AT_jdom_DOT_org>.
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27
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28 In addition, we request (but do not require) that you include in the
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29 end-user documentation provided with the redistribution and/or in the
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30 software itself an acknowledgement equivalent to the following:
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31 "This product includes software developed by the
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32 JDOM Project (http://www.jdom.org/)."
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33 Alternatively, the acknowledgment may be graphical using the logos
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34 available at http://www.jdom.org/images/logos.
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35
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36 THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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37 WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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38 OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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39 DISCLAIMED. IN NO EVENT SHALL THE JDOM AUTHORS OR THE PROJECT
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40 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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41 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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42 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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43 USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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44 ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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45 OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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46 OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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47 SUCH DAMAGE.
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48
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49 This software consists of voluntary contributions made by many
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50 individuals on behalf of the JDOM Project and was originally
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51 created by Jason Hunter <jhunter_AT_jdom_DOT_org> and
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52 Brett McLaughlin <brett_AT_jdom_DOT_org>. For more information
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53 on the JDOM Project, please see <http://www.jdom.org/>.
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54
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55 */
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56
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57 package org.jdom.filter;
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58
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59 /**
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60 * Filter that is the logical <b>negation</b> operation of another filter.
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61 *
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62 *
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63 * @author Bradley S. Huffman
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64 * @version $Revision: 1.4 $, $Date: 2007/11/10 05:29:00 $
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65 */
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66 final class NegateFilter extends AbstractFilter {
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67
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68 private static final String CVS_ID =
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69 "@(#) $RCSfile: NegateFilter.java,v $ $Revision: 1.4 $ $Date: 2007/11/10 05:29:00 $";
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70
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71 // Underlying filter.
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72 private Filter filter;
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73
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74 /**
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75 * Match if the supplied filter <b>does not</b> match.
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76 *
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77 * @param filter filter to use.
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78 */
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79 public NegateFilter(Filter filter) {
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80 this.filter = filter;
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81 }
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82
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83 public boolean matches(Object obj) {
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84 return !filter.matches(obj);
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85 }
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86
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87 public Filter negate() {
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88 return filter;
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89 }
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90
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91 public boolean equals(Object obj) {
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92 if (this == obj) {
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93 return true;
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94 }
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95
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96 if (obj instanceof NegateFilter) {
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97 return filter.equals(((NegateFilter) obj).filter);
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98 }
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99 return false;
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100 }
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101
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102 public int hashCode() {
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103 return ~filter.hashCode();
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104 }
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105
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106 public String toString() {
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107 return new StringBuffer(64)
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108 .append("[NegateFilter: ")
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109 .append(filter.toString())
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110 .append("]")
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111 .toString();
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112 }
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113 }
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