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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/BaseTypes/Class.js
* @requires OpenLayers/Util.js
* @requires OpenLayers/Style.js
*/
/**
* Class: OpenLayers.Filter
* This class represents an OGC Filter.
*/
OpenLayers.Filter = OpenLayers.Class({
/**
* Constructor: OpenLayers.Filter
* This class represents a generic filter.
*
* Parameters:
* options - {Object} Optional object whose properties will be set on the
* instance.
*
* Returns:
* {<OpenLayers.Filter>}
*/
initialize: function(options) {
OpenLayers.Util.extend(this, options);
},
/**
* APIMethod: destroy
* Remove reference to anything added.
*/
destroy: function() {
},
/**
* APIMethod: evaluate
* Evaluates this filter in a specific context. Instances or subclasses
* are supposed to override this method.
*
* Parameters:
* context - {Object} Context to use in evaluating the filter. If a vector
* feature is provided, the feature.attributes will be used as context.
*
* Returns:
* {Boolean} The filter applies.
*/
evaluate: function(context) {
return true;
},
/**
* APIMethod: clone
* Clones this filter. Should be implemented by subclasses.
*
* Returns:
* {<OpenLayers.Filter>} Clone of this filter.
*/
clone: function() {
return null;
},
/**
* APIMethod: toString
*
* Returns:
* {String} Include <OpenLayers.Format.CQL> in your build to get a CQL
* representation of the filter returned. Otherwise "[Object object]"
* will be returned.
*/
toString: function() {
var string;
if (OpenLayers.Format && OpenLayers.Format.CQL) {
string = OpenLayers.Format.CQL.prototype.write(this);
} else {
string = Object.prototype.toString.call(this);
}
return string;
},
CLASS_NAME: "OpenLayers.Filter"
});