1 | /* Copyright (c) 2006-2010 by OpenLayers Contributors (see authors.txt for |
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2 | * full list of contributors). Published under the Clear BSD license. |
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3 | * See http://svn.openlayers.org/trunk/openlayers/license.txt for the |
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4 | * full text of the license. */ |
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5 | |
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6 | |
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7 | /** |
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8 | * @requires OpenLayers/Filter.js |
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9 | */ |
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10 | |
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11 | /** |
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12 | * Class: OpenLayers.Filter.Logical |
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13 | * This class represents ogc:And, ogc:Or and ogc:Not rules. |
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14 | * |
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15 | * Inherits from |
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16 | * - <OpenLayers.Filter> |
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17 | */ |
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18 | OpenLayers.Filter.Logical = OpenLayers.Class(OpenLayers.Filter, { |
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19 | |
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20 | /** |
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21 | * APIProperty: filters |
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22 | * {Array(<OpenLayers.Filter>)} Child filters for this filter. |
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23 | */ |
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24 | filters: null, |
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25 | |
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26 | /** |
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27 | * APIProperty: type |
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28 | * {String} type of logical operator. Available types are: |
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29 | * - OpenLayers.Filter.Logical.AND = "&&"; |
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30 | * - OpenLayers.Filter.Logical.OR = "||"; |
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31 | * - OpenLayers.Filter.Logical.NOT = "!"; |
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32 | */ |
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33 | type: null, |
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34 | |
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35 | /** |
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36 | * Constructor: OpenLayers.Filter.Logical |
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37 | * Creates a logical filter (And, Or, Not). |
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38 | * |
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39 | * Parameters: |
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40 | * options - {Object} An optional object with properties to set on the |
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41 | * filter. |
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42 | * |
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43 | * Returns: |
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44 | * {<OpenLayers.Filter.Logical>} |
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45 | */ |
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46 | initialize: function(options) { |
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47 | this.filters = []; |
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48 | OpenLayers.Filter.prototype.initialize.apply(this, [options]); |
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49 | }, |
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50 | |
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51 | /** |
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52 | * APIMethod: destroy |
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53 | * Remove reference to child filters. |
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54 | */ |
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55 | destroy: function() { |
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56 | this.filters = null; |
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57 | OpenLayers.Filter.prototype.destroy.apply(this); |
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58 | }, |
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59 | |
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60 | /** |
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61 | * APIMethod: evaluate |
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62 | * Evaluates this filter in a specific context. |
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63 | * |
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64 | * Parameters: |
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65 | * context - {Object} Context to use in evaluating the filter. A vector |
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66 | * feature may also be provided to evaluate feature attributes in |
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67 | * comparison filters or geometries in spatial filters. |
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68 | * |
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69 | * Returns: |
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70 | * {Boolean} The filter applies. |
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71 | */ |
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72 | evaluate: function(context) { |
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73 | switch(this.type) { |
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74 | case OpenLayers.Filter.Logical.AND: |
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75 | for (var i=0, len=this.filters.length; i<len; i++) { |
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76 | if (this.filters[i].evaluate(context) == false) { |
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77 | return false; |
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78 | } |
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79 | } |
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80 | return true; |
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81 | |
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82 | case OpenLayers.Filter.Logical.OR: |
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83 | for (var i=0, len=this.filters.length; i<len; i++) { |
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84 | if (this.filters[i].evaluate(context) == true) { |
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85 | return true; |
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86 | } |
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87 | } |
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88 | return false; |
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89 | |
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90 | case OpenLayers.Filter.Logical.NOT: |
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91 | return (!this.filters[0].evaluate(context)); |
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92 | } |
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93 | }, |
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94 | |
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95 | /** |
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96 | * APIMethod: clone |
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97 | * Clones this filter. |
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98 | * |
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99 | * Returns: |
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100 | * {<OpenLayers.Filter.Logical>} Clone of this filter. |
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101 | */ |
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102 | clone: function() { |
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103 | var filters = []; |
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104 | for(var i=0, len=this.filters.length; i<len; ++i) { |
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105 | filters.push(this.filters[i].clone()); |
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106 | } |
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107 | return new OpenLayers.Filter.Logical({ |
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108 | type: this.type, |
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109 | filters: filters |
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110 | }); |
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111 | }, |
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112 | |
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113 | CLASS_NAME: "OpenLayers.Filter.Logical" |
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114 | }); |
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115 | |
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116 | |
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117 | OpenLayers.Filter.Logical.AND = "&&"; |
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118 | OpenLayers.Filter.Logical.OR = "||"; |
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119 | OpenLayers.Filter.Logical.NOT = "!"; |
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