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