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  /**
    @class
    <p>A filter for locating documents that fall within a polygon of points. Simply provide a lon/lat
    for each document as a Geo Point type. The format conforms with the GeoJSON specification.</p>

    @name ejs.GeoPolygonFilter

    @desc
    Filter results to those which are contained within the polygon of points.

    @param {String} fieldName the document property/field containing the Geo Point (lon/lat).
    */
  ejs.GeoPolygonFilter = function (fieldName) {

    /**
         The internal filter object. Use <code>_self()</code>

         @member ejs.GeoPolygonFilter
         @property {Object} filter
         */
    var filter = {
      geo_polygon: {}
    };

    filter.geo_polygon[fieldName] = {
      points: []
    };

    return {

      /**
           Sets the fields to filter against.

           @member ejs.GeoPolygonFilter
           @param {String} f A valid field name.
           @returns {Object} returns <code>this</code> so that calls can be chained.
           */
      field: function (f) {
        var oldValue = filter.geo_polygon[fieldName];

        if (f == null) {
          return fieldName;
        }

        delete filter.geo_polygon[fieldName];
        fieldName = f;
        filter.geo_polygon[f] = oldValue;

        return this;
      },
       
      /**
             Sets a series of points that represent a polygon.  If passed a 
             single <code>GeoPoint</code> object, it is added to the current 
             list of points.  If passed an array of <code>GeoPoint</code> 
             objects it replaces all current values. 

             @member ejs.GeoPolygonFilter
             @param {Array} pointsArray the array of points that represent the polygon
             @returns {Object} returns <code>this</code> so that calls can be chained.
             */
      points: function (p) {
        var i, len;
        
        if (p == null) {
          return filter.geo_polygon[fieldName].points;
        }
      
        if (isGeoPoint(p)) {
          filter.geo_polygon[fieldName].points.push(p._self());
        } else if (isArray(p)) {
          filter.geo_polygon[fieldName].points = [];
          for (i = 0, len = p.length; i < len; i++) {
            if (!isGeoPoint(p[i])) {
              throw new TypeError('Argument must be Array of GeoPoints');
            }
            
            filter.geo_polygon[fieldName].points.push(p[i]._self());
          }
        } else {
          throw new TypeError('Argument must be a GeoPoint or Array of GeoPoints');
        }
        
        return this;
      },

      /**
            If the lat/long points should be normalized to lie within their
            respective normalized ranges.
            
            Normalized ranges are:
            lon = -180 (exclusive) to 180 (inclusive) range
            lat = -90 to 90 (both inclusive) range

            @member ejs.GeoPolygonFilter
            @param {String} trueFalse True if the coordinates should be normalized. False otherwise.
            @returns {Object} returns <code>this</code> so that calls can be chained.
            */
      normalize: function (trueFalse) {
        if (trueFalse == null) {
          return filter.geo_polygon.normalize;
        }

        filter.geo_polygon.normalize = trueFalse;
        return this;
      },
      
      /**
            Sets the filter name.

            @member ejs.GeoPolygonFilter
            @param {String} name A name for the filter.
            @returns {Object} returns <code>this</code> so that calls can be chained.
            */
      name: function (name) {
        if (name == null) {
          return filter.geo_polygon._name;
        }

        filter.geo_polygon._name = name;
        return this;
      },

      /**
            Enable or disable caching of the filter

            @member ejs.GeoPolygonFilter
            @param {Boolean} trueFalse True to cache the filter, false otherwise.
            @returns {Object} returns <code>this</code> so that calls can be chained.
            */
      cache: function (trueFalse) {
        if (trueFalse == null) {
          return filter.geo_polygon._cache;
        }

        filter.geo_polygon._cache = trueFalse;
        return this;
      },
    
      /**
            Sets the cache key.

            @member ejs.GeoPolygonFilter
            @param {String} key the cache key as a string.
            @returns {Object} returns <code>this</code> so that calls can be chained.
            */
      cacheKey: function (key) {
        if (key == null) {
          return filter.geo_polygon._cache_key;
        }

        filter.geo_polygon._cache_key = key;
        return this;
      },
      
      /**
             Returns the filter container as a JSON string

             @member ejs.GeoPolygonFilter
             @returns {String} JSON representation of the notFilter object
             */
      toString: function () {
        return JSON.stringify(filter);
      },

      /**
            The type of ejs object.  For internal use only.
            
            @member ejs.GeoPolygonFilter
            @returns {String} the type of object
            */
      _type: function () {
        return 'filter';
      },
      
      /**
             Returns the filter object.

             @member ejs.GeoPolygonFilter
             @returns {Object} filter object
             */
      _self: function () {
        return filter;
      }
    };
  };
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