# Code coverage report for lib/accessors/pojo.js

## Statements: 100% (69 / 69) Branches: 92% (23 / 25) Functions: 100% (17 / 17) Lines: 100% (65 / 65) Ignored: none

All files » lib/accessors/ » pojo.js

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     var BaseAccessor = require("./base");
    var _set         = require("../utils/set");

    function POJOAccessor() {
      BaseAccessor.call(this);
      this._getters  = {};
      this._callers  = {};
      this._watchers = [];
    }

    module.exports = BaseAccessor.extend(POJOAccessor, {

      /**
       */

      castObject: function(object) { return object; },

      /**
       */

      call: function(object, path, params) {

        var caller;

        if (!(caller = this._callers[path])) {
          var ctxPath = ["this"].concat(path.split("."));
          ctxPath.pop();
          ctxPath = ctxPath.join(".");
          caller = this._callers[path] = new Function("params", "return this." + path + ".apply(" + ctxPath + ", params);");
        }

        try {
          var ret = caller.call(object, params);
          this.applyChanges();
          return ret;
        } catch (e) {
          return void 0;
        }
      },

      /**
       */

      get: function(object, path) {

        var pt = typeof path !== "string" ? path.join(".") : path;
        var getter;

        if (!(getter = this._getters[pt])) {
          getter = this._getters[pt] = new Function("return this." + pt);
        }

        // is undefined - fugly, but works for this test.
        try {
          return getter.call(object);
        } catch (e) {
          return void 0;
        }
      },

      /**
       */

      set: function(object, path, value) {

        Eif (typeof path === "string") path = path.split(".");

        var ret = _set(object, path, value);

        this.applyChanges();

        return ret;
      },

      /**
       */

      watchProperty: function(object, path, listener) {

        var self = this;
        var currentValue;
        var firstCall = true;

        return this._addWatcher(function() {
          var newValue = self.get(object, path);
          if (!firstCall && newValue === currentValue && typeof newValue !== "function") return;
          firstCall = false;
          var oldValue = currentValue;
          currentValue = newValue;
          listener(newValue, currentValue);
        });
      },

      /**
       */

      _addWatcher: function(applyChanges) {

        var self = this;

        var watcher = {
          apply: applyChanges,
          trigger: applyChanges,
          dispose: function() {
            var i = self._watchers.indexOf(watcher);
            if (~i) self._watchers.splice(i, 1);
          }
        };

        this._watchers.push(watcher);

        return watcher;
      },

      /**
       */

      watchEvent: function(object, event, listener) {

        if (Object.prototype.toString.call(object) === "[object Array]" && event === "change") {
          return this._watchArrayChangeEvent(object, listener);
        }

        return {
          dispose: function() { }
        };
      },

      /**
       */

      _watchArrayChangeEvent: function(object, listener) {

        var copy = object.concat();

        return this._addWatcher(function() {

          var hasChanged = object.length !== copy.length;

          if (!hasChanged) {
            for (var i = 0, n = copy.length; i < n; i++) {
              hasChanged = (copy[i] !== object[i]);
              if (hasChanged) break;
            }
          }

          if (hasChanged) {
            copy = object.concat();
            listener();
          }
        });
      },

      /**
       * TODO - deserialize is improper. Maybe use
       */

      normalizeCollection: function(collection) {
        return collection;
      },

      /**
       */

      normalizeObject: function(object) {
        return object;
      },

      /**
       * DEPRECATED
       */

      apply: function() {
        this.applyChanges();
      },

      /**
       */

      applyChanges: function() {
        // if (this.__applyingChanges) return;
        // this.__applyingChanges = true;
        for (var i = 0, n = this._watchers.length; i < n; i++) {
          this._watchers[i].apply();
        }
        // this.__applyingChanges = false;
      }
    });