Add method to auto tests' proxy to clear the call list for better testing.

[dygraphs.git] / auto_tests / tests / Proxy.js

// Copyright (c) 2011 Google, Inc.
//
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// all copies or substantial portions of the Software.
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// THE SOFTWARE.

/** 
 * @fileoverview A general purpose object proxy that logs all method calls.
 *
 * @author konigsberg@google.com (Robert Konigsberg)
 */

var Proxy = function(delegate) {
  this.delegate__ = delegate;
  this.calls__ = [];
  this.propertiesToTrack__ = [];

  for (var propname in delegate) {
    var type = typeof(delegate[propname]);

    // Functions are passed through to the delegate, and are logged
    // prior to the call.
    if (type == "function") {
      function makeFunc(name) {
        return function() {
          this.log__(name, arguments);
          return this.delegate__[name].apply(this.delegate__, arguments);
        }
      };
      this[propname] = makeFunc(propname);
    } else if (type == "string" || type == "number") {
      // String and number properties are just passed through to the delegate.
      this.propertiesToTrack__.push(propname);
      function makeSetter(name) {
        return function(x) {
          this.delegate__[name] = x;
        }
      };
      this.__defineSetter__(propname, makeSetter(propname));

      function makeGetter(name) {
        return function() {
          return this.delegate__[name];
        }
      };
      this.__defineGetter__(propname, makeGetter(propname));
    }
  }
};

Proxy.prototype.log__ = function(name, args) {
  var properties = {};
  for (var propIdx in this.propertiesToTrack__) {
    var prop = this.propertiesToTrack__[propIdx];
    properties[prop] = this.delegate__[prop];
  }
  var call = { name : name, args : args, properties: properties };
  this.calls__.push(call);
};

Proxy.reset = function(proxy) {
  proxy.calls__ = [];
}