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Viewing changes to gis/dhis-gis-geostat/mfbase/openlayers/lib/OpenLayers/Filter/Logical.js

  • Committer: larshelge at gmail
  • Date: 2009-03-03 16:46:36 UTC
  • Revision ID: larshelge@gmail.com-20090303164636-2sjlrquo7ib1gf7r
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gis/dhis-gis-geostat/mfbase/openlayers/lib/OpenLayers/Filter/Logical.js
 
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/* Copyright (c) 2006-2008 MetaCarta, Inc., published under the Clear BSD
 
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 * license.  See http://svn.openlayers.org/trunk/openlayers/license.txt 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.Locical.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.  Should be implemented by
 
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     *     subclasses.
 
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     * 
 
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     * Parameters:
 
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     * context - {Object} Context to use in evaluating the filter.
 
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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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        switch(this.type) {
 
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            case OpenLayers.Filter.Logical.AND:
 
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                for (var 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 (var 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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    },
 
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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 = "!";