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  /**
    @class
    <p>Nested queries allow you to search against content within objects that are
       embedded inside of other objects. It is similar to <code>XPath</code> expressions
       in <code>XML</code> both conceptually and syntactically.</p>

    <p>The query is executed against the nested objects / docs as if they were 
    indexed as separate docs and resulting in the rootparent doc (or parent 
    nested mapping).</p>
    
    @name ejs.NestedQuery

    @desc
    <p>Constructs a query that is capable of executing a search against objects
       nested within a document.</p>

    @param {String} path The nested object path.

     */
  ejs.NestedQuery = function (path) {

    /**
         The internal Query object. Use <code>_self()</code>.
         
         @member ejs.NestedQuery
         @property {Object} query
         */
    var query = {
      nested: {
        path: path
      }
    };

    return {
      
      /**
             Sets the root context for the nested query.
             
             @member ejs.NestedQuery
             @param {String} path The path defining the root context for the nested query.
             @returns {Object} returns <code>this</code> so that calls can be chained.
             */
      path: function (path) {
        if (path == null) {
          return query.nested.path;
        }
      
        query.nested.path = path;
        return this;
      },

      /**
             Sets the nested query to be executed.
             
             @member ejs.NestedQuery
             @param {Object} oQuery A valid Query object
             @returns {Object} returns <code>this</code> so that calls can be chained.
             */
      query: function (oQuery) {
        if (oQuery == null) {
          return query.nested.query;
        }
    
        if (!isQuery(oQuery)) {
          throw new TypeError('Argument must be a Query');
        }
        
        query.nested.query = oQuery._self();
        return this;
      },


      /**
             Sets the nested filter to be executed.
             
             @member ejs.NestedQuery
             @param {Object} oFilter A valid Filter object
             @returns {Object} returns <code>this</code> so that calls can be chained.
             */
      filter: function (oFilter) {
        if (oFilter == null) {
          return query.nested.filter;
        }
    
        if (!isFilter(oFilter)) {
          throw new TypeError('Argument must be a Filter');
        }
        
        query.nested.filter = oFilter._self();
        return this;
      },

      /**
             Sets how the inner (nested) matches affect scoring on the parent document.
             
             @member ejs.NestedQuery
             @param {String} mode The mode of scoring to be used for nested matches.
                             Options are avg, total, max, none - defaults to avg
             @returns {Object} returns <code>this</code> so that calls can be chained.
             */
      scoreMode: function (mode) {
        if (mode == null) {
          return query.nested.score_mode;
        }
      
        mode = mode.toLowerCase();
        if (mode === 'avg' || mode === 'total' || mode === 'max' || 
          mode === 'none' || mode === 'sum') {
            
          query.nested.score_mode = mode;
        }
        
        return this;
      },

      /**
            Sets the scope of the query.  A scope allows to run facets on the 
            same scope name that will work against the nested documents. 

            @deprecated since elasticsearch 0.90
            @member ejs.NestedQuery
            @param {String} s The scope name as a string.
            @returns {Object} returns <code>this</code> so that calls can be chained.
            */
      scope: function (s) {
        return this;
      },
      
      /**
            Sets the boost value of the nested <code>Query</code>.

            @member ejs.NestedQuery
            @param {Double} boost A positive <code>double</code> value.
            @returns {Object} returns <code>this</code> so that calls can be chained.
            */
      boost: function (boost) {
        if (boost == null) {
          return query.nested.boost;
        }

        query.nested.boost = boost;
        return this;
      },
      
      /**
             Serializes the internal <em>query</em> object as a JSON string.
             
             @member ejs.NestedQuery
             @returns {String} Returns a JSON representation of the termFilter object.
             */
      toString: function () {
        return JSON.stringify(query);
      },

      /**
            The type of ejs object.  For internal use only.
            
            @member ejs.NestedQuery
            @returns {String} the type of object
            */
      _type: function () {
        return 'query';
      },
      
      /**
            This method is used to retrieve the raw query object. It's designed
            for internal use when composing and serializing queries.
            
            @member ejs.NestedQuery
            @returns {Object} Returns the object's <em>query</em> property.
            */
      _self: function () {
        return query;
      }
    };
  };
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