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   1  /*
   2  YUI 3.17.2 (build 9c3c78e)
   3  Copyright 2014 Yahoo! Inc. All rights reserved.
   4  Licensed under the BSD License.
   5  http://yuilibrary.com/license/
   6  */
   7  
   8  YUI.add('datasource-function', function (Y, NAME) {
   9  
  10  /**
  11   * Provides a DataSource implementation which can be used to retrieve data from
  12   * a custom function.
  13   *
  14   * @module datasource
  15   * @submodule datasource-function
  16   */
  17  
  18  /**
  19   * Function subclass for the DataSource Utility.
  20   * @class DataSource.Function
  21   * @extends DataSource.Local
  22   * @constructor
  23   */
  24  var LANG = Y.Lang,
  25  
  26      DSFn = function() {
  27          DSFn.superclass.constructor.apply(this, arguments);
  28      };
  29  
  30  
  31      /////////////////////////////////////////////////////////////////////////////
  32      //
  33      // DataSource.Function static properties
  34      //
  35      /////////////////////////////////////////////////////////////////////////////
  36  Y.mix(DSFn, {
  37      /**
  38       * Class name.
  39       *
  40       * @property NAME
  41       * @type String
  42       * @static
  43       * @final
  44       * @value "dataSourceFunction"
  45       */
  46      NAME: "dataSourceFunction",
  47  
  48  
  49      /////////////////////////////////////////////////////////////////////////////
  50      //
  51      // DataSource.Function Attributes
  52      //
  53      /////////////////////////////////////////////////////////////////////////////
  54  
  55      ATTRS: {
  56          /**
  57          * Stores the function that will serve the response data.
  58          *
  59          * @attribute source
  60          * @type {Any}
  61          * @default null
  62          */
  63          source: {
  64              validator: LANG.isFunction
  65          }
  66      }
  67  });
  68  
  69  Y.extend(DSFn, Y.DataSource.Local, {
  70      /**
  71       * Passes query data to the source function. Fires <code>response</code>
  72       * event with the function results (synchronously).
  73       *
  74       * @method _defRequestFn
  75       * @param e {EventFacade} Event Facade with the following properties:
  76       * <dl>
  77       * <dt>tId (Number)</dt> <dd>Unique transaction ID.</dd>
  78       * <dt>request (Object)</dt> <dd>The request.</dd>
  79       * <dt>callback (Object)</dt> <dd>The callback object with the following
  80       * properties:
  81       *     <dl>
  82       *         <dt>success (Function)</dt> <dd>Success handler.</dd>
  83       *         <dt>failure (Function)</dt> <dd>Failure handler.</dd>
  84       *     </dl>
  85       * </dd>
  86       * <dt>cfg (Object)</dt> <dd>Configuration object.</dd>
  87       * </dl>
  88       * @protected
  89       */
  90      _defRequestFn: function(e) {
  91          var fn = this.get("source"),
  92              payload = e.details[0];
  93  
  94          if (fn) {
  95              try {
  96                  payload.data = fn(e.request, this, e);
  97              } catch (ex) {
  98                  Y.log("Function execution failure", "error", "datasource-function");
  99                  payload.error = ex;
 100              }
 101          } else {
 102              Y.log("Function data failure", "error", "datasource-function");
 103              payload.error = new Error("Function data failure");
 104          }
 105  
 106          this.fire("data", payload);
 107  
 108          return e.tId;
 109      }
 110  });
 111  
 112  Y.DataSource.Function = DSFn;
 113  
 114  
 115  }, '3.17.2', {"requires": ["datasource-local"]});