alasql/test/cordova/filestorage.js

AlaSQL.js - JavaScript SQL database library for relational and graph data manipulation with support of localStorage, IndexedDB, and Excel

var gv = undefined;

function loadFile(path,asy,success,error) {
  return gv;
}

function saveFile(path,data,callback) {
      gv = data;
      console.log(gv);
      callback();
};

  function FileStorage(path, opts) {
    var self = this;
    opts = opts || {};
    var db
      ;

    Object.defineProperty(this, '___priv_bk___', {
      value: {
        path: path
      }
    , writable: false
    , enumerable: false
    });

    Object.defineProperty(this, '___priv_strict___', {
      value: !!opts.strict
    , writable: false
    , enumerable: false
    });

    Object.defineProperty(this, '___priv_ws___', {
      value: opts.ws || '  '
    , writable: false
    , enumerable: false
    });

    loadFile(path,true,function(data){
      try {
        db = JSON.parse(data);
      } catch(e) {
        db = {};
      }

      Object.keys(db).forEach(function (key) {
        self[key] = db[key];
      }, self);
    });
  }

  FileStorage.prototype.getItem = function (key) {
    if (this.hasOwnProperty(key)) {
      if (this.___priv_strict___) {
        return String(this[key]);
      } else {
        return this[key];
      }
    }
    return null;
  };

  FileStorage.prototype.setItem = function (key, val) {
    if (val === undefined) {
      this[key] = null;
    } else if (this.___priv_strict___) {
      this[key] = String(val);
    } else {
      this[key] = val;
    }
    this.___save___();
  };

  FileStorage.prototype.removeItem = function (key) {
    delete this[key];
    this.___save___();
  };

  FileStorage.prototype.clear = function () {
    var self = this;
    // filters out prototype keys
    Object.keys(self).forEach(function (key) {
      self[key] = undefined;
      delete self[key];
    });
  };

  FileStorage.prototype.key = function (i) {
    i = i || 0;
    return Object.keys(this)[i];
  };

  FileStorage.prototype.__defineGetter__('length', function () {
    return Object.keys(this).length;
  });

  FileStorage.prototype.___save___ = function () {
    var self = this
      ;

    if (!this.___priv_bk___.path) {
      return;
    }

    if (this.___priv_bk___.lock) {
      this.___priv_bk___.wait = true;
      return;
    }

    this.___priv_bk___.lock = true;
    saveFile(
      this.___priv_bk___.path
    , JSON.stringify(this, null, this.___priv_ws___)
    , function (e) {
      self.___priv_bk___.lock = false;
      if (e) {
        return;
      }
      if (self.___priv_bk___.wait) {
        self.___priv_bk___.wait = false;
        self.___save___();
      }
    });
  };

  Object.defineProperty(FileStorage, 'create', {
    value: function (path, opts) {
      return new FileStorage(path, opts);
    }
  , writable: false
  , enumerable: false
  });


exports.FileStorage = FileStorage;
// Start to use

//  fileStorage = new FileStorage("./fstest.json", { strict: false, ws: '' });