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/* Copyright (c) 2006-2013 by OpenLayers Contributors (see authors.txt for
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* full list of contributors). Published under the 2-clause BSD license.
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* See license.txt in the OpenLayers distribution or repository for the
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* full text of the license. */
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/**
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* @requires OpenLayers/Filter.js
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*/
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/**
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* Class: OpenLayers.Filter.Logical
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* This class represents ogc:And, ogc:Or and ogc:Not rules.
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*
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* Inherits from:
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* - <OpenLayers.Filter>
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*/
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OpenLayers.Filter.Logical = OpenLayers.Class(OpenLayers.Filter, {
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/**
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* APIProperty: filters
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* {Array(<OpenLayers.Filter>)} Child filters for this filter.
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*/
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filters: null,
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/**
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* APIProperty: type
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* {String} type of logical operator. Available types are:
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* - OpenLayers.Filter.Logical.AND = "&&";
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* - OpenLayers.Filter.Logical.OR = "||";
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* - OpenLayers.Filter.Logical.NOT = "!";
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*/
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type: null,
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/**
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* Constructor: OpenLayers.Filter.Logical
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* Creates a logical filter (And, Or, Not).
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*
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* Parameters:
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* options - {Object} An optional object with properties to set on the
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* filter.
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*
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* Returns:
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* {<OpenLayers.Filter.Logical>}
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*/
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initialize: function(options) {
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this.filters = [];
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OpenLayers.Filter.prototype.initialize.apply(this, [options]);
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},
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/**
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* APIMethod: destroy
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* Remove reference to child filters.
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*/
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destroy: function() {
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this.filters = null;
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OpenLayers.Filter.prototype.destroy.apply(this);
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},
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/**
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* APIMethod: evaluate
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* Evaluates this filter in a specific context.
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*
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* Parameters:
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* context - {Object} Context to use in evaluating the filter. A vector
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* feature may also be provided to evaluate feature attributes in
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* comparison filters or geometries in spatial filters.
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*
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* Returns:
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* {Boolean} The filter applies.
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*/
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evaluate: function(context) {
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var i, len;
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switch(this.type) {
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case OpenLayers.Filter.Logical.AND:
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for (i=0, len=this.filters.length; i<len; i++) {
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if (this.filters[i].evaluate(context) == false) {
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return false;
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}
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}
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return true;
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case OpenLayers.Filter.Logical.OR:
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for (i=0, len=this.filters.length; i<len; i++) {
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if (this.filters[i].evaluate(context) == true) {
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return true;
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}
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}
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return false;
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case OpenLayers.Filter.Logical.NOT:
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return (!this.filters[0].evaluate(context));
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}
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return undefined;
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},
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/**
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* APIMethod: clone
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* Clones this filter.
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*
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* Returns:
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* {<OpenLayers.Filter.Logical>} Clone of this filter.
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*/
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clone: function() {
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var filters = [];
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for(var i=0, len=this.filters.length; i<len; ++i) {
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filters.push(this.filters[i].clone());
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}
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return new OpenLayers.Filter.Logical({
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type: this.type,
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filters: filters
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});
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},
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CLASS_NAME: "OpenLayers.Filter.Logical"
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});
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OpenLayers.Filter.Logical.AND = "&&";
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OpenLayers.Filter.Logical.OR = "||";
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OpenLayers.Filter.Logical.NOT = "!";
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