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