IDBTransaction.js

/*
 Copyright 2012 Facebook Inc.

 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

 http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 */

if (window.indexedDB.polyfill)
  (function (window, util, undefined) {
    var IDBTransaction = util.IDBTransaction = window.IDBTransaction = function (db, storeNames, mode) {
      this.db = db;
      this.mode = mode;
      this.onabort = null;
      this.oncomplete = null;
      this.onerror = null;

      this._active = true;
      this._requests = [];
      var sqldb = this.db._webdb;

      // Main
      db._activeTransactionCounter++;

      var txFn;
      if (mode === IDBTransaction.READ_ONLY) txFn = sqldb.readTransaction;
      else if (mode === IDBTransaction.READ_WRITE) txFn = sqldb.transaction;
      else if (mode === IDBTransaction.VERSION_CHANGE) {
        txFn = function (x, y, z) { sqldb.changeVersion(sqldb.version, db.version, x, y, z); };
      }

      var me = this;
      txFn && txFn.call(sqldb,
        function (sqlTx) { performOperation(me, sqlTx, 0); },
        function (sqlError) {
          db.close();

          db._transactionCompleted();

          me.error = util.error("AbortError", null, sqlError);
          if (me.onabort) me.onabort(util.event("abort", me));
        },
        function () {
          db._transactionCompleted();

          if (me.oncomplete) me.oncomplete(util.event("success", me));
        });
    };

    function performOperation(me, sqlTx, operationIndex) {
      if (!me._active) return;

      if (operationIndex >= me._requests.length) {
        me._active = false;
        me._requests = [];
        /*for (var name in me.db._objectStores)
         {
         me.db._objectStores[name].transaction = null;
         }*/
        return;
      }
      me._requests[operationIndex](sqlTx, function () {
        performOperation(me, sqlTx, operationIndex + 1);
      });
    }

    IDBTransaction.prototype.objectStore = function (name) {
      validateActive(this);
      var objectStore = this.db._objectStores[name];
      if (objectStore) {
        objectStore.transaction = this;
        return objectStore;
      }
      else {
        throw util.error("NotFoundError");
      }
    };

    IDBTransaction.prototype.abort = function () {
      if (!this._active) throw util.error("InvalidStateError");
      this._queueOperation(function (sqlTx, nextRequestCallback) {
        throw util.error("AbortError");
      });
    };

    IDBTransaction.prototype._queueOperation = function (sqlTxCallback) {
      validateActive(this);
      this._requests.push(sqlTxCallback);
    };

    IDBTransaction._assertNotReadOnly = function (tx) {
      if (tx.mode === util.IDBTransaction.READ_ONLY) {
        throw util.error("ReadOnlyError", "A mutation operation was attempted in a READ_ONLY transaction.");
      }
    };

    IDBTransaction._assertVersionChange = function (tx) {
      if (!tx || tx.mode !== util.IDBTransaction.VERSION_CHANGE) {
        throw util.error("InvalidStateError");
      }
    };

    IDBTransaction.READ_ONLY = "readonly";
    IDBTransaction.READ_WRITE = "readwrite";
    IDBTransaction.VERSION_CHANGE = "versionchange";

    // Utils
    function validateActive(me) {
      if (!me._active) throw new util.error("TransactionInactiveError");
    }

  }(window, window.indexedDB.util));