[Files.app] Split the JavaScript files into subdirectories: common, background, and foreground

chrome/browser/resources/file_manager/js/directory_model.js

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-'use strict';
-
-// If directory files changes too often, don't rescan directory more than once
-// per specified interval
-var SIMULTANEOUS_RESCAN_INTERVAL = 1000;
-// Used for operations that require almost instant rescan.
-var SHORT_RESCAN_INTERVAL = 100;
-
-/**
- * Data model of the file manager.
- *
- * @param {boolean} singleSelection True if only one file could be selected
- *                                  at the time.
- * @param {FileFilter} fileFilter Instance of FileFilter.
- * @param {FileWatcher} fileWatcher Instance of FileWatcher.
- * @param {MetadataCache} metadataCache The metadata cache service.
- * @param {VolumeManagerWrapper} volumeManager The volume manager.
- * @param {boolean} showSpecialSearchRoots True if special-search roots are
- *     available. They should be hidden for the dialogs to save files.
- * @constructor
- */
-function DirectoryModel(singleSelection, fileFilter, fileWatcher,
-                        metadataCache, volumeManager,
-                        showSpecialSearchRoots) {
-  this.fileListSelection_ = singleSelection ?
-      new cr.ui.ListSingleSelectionModel() : new cr.ui.ListSelectionModel();
-
-  this.runningScan_ = null;
-  this.pendingScan_ = null;
-  this.rescanTime_ = null;
-  this.scanFailures_ = 0;
-  this.showSpecialSearchRoots_ = showSpecialSearchRoots;
-
-  this.fileFilter_ = fileFilter;
-  this.fileFilter_.addEventListener('changed',
-                                    this.onFilterChanged_.bind(this));
-
-  this.currentFileListContext_ = new FileListContext(
-      fileFilter, metadataCache);
-  this.currentDirContents_ =
-      DirectoryContents.createForDirectory(this.currentFileListContext_, null);
-
-  this.volumeManager_ = volumeManager;
-  this.volumeManager_.volumeInfoList.addEventListener(
-      'splice', this.onVolumeInfoListUpdated_.bind(this));
-
-  this.fileWatcher_ = fileWatcher;
-  this.fileWatcher_.addEventListener(
-      'watcher-directory-changed',
-      this.onWatcherDirectoryChanged_.bind(this));
-}
-
-/**
- * Fake entry to be used in currentDirEntry_ when current directory is
- * unmounted DRIVE. TODO(haruki): Support "drive/root" and "drive/other".
- * @type {Object}
- * @const
- * @private
- */
-DirectoryModel.fakeDriveEntry_ = {
-  fullPath: RootDirectory.DRIVE + '/' + DriveSubRootDirectory.ROOT,
-  isDirectory: true
-};
-
-/**
- * Fake entry representing a psuedo directory, which contains Drive files
- * available offline. This entry works as a trigger to start a search for
- * offline files.
- * @type {Object}
- * @const
- * @private
- */
-DirectoryModel.fakeDriveOfflineEntry_ = {
-  fullPath: RootDirectory.DRIVE_OFFLINE,
-  isDirectory: true
-};
-
-/**
- * Fake entry representing a pseudo directory, which contains shared-with-me
- * Drive files. This entry works as a trigger to start a search for
- * shared-with-me files.
- * @type {Object}
- * @const
- * @private
- */
-DirectoryModel.fakeDriveSharedWithMeEntry_ = {
-  fullPath: RootDirectory.DRIVE_SHARED_WITH_ME,
-  isDirectory: true
-};
-
-/**
- * Fake entry representing a pseudo directory, which contains Drive files
- * accessed recently. This entry works as a trigger to start a metadata search
- * implemented as DirectoryContentsDriveRecent.
- * DirectoryModel is responsible to start the search when the UI tries to open
- * this fake entry (e.g. changeDirectory()).
- * @type {Object}
- * @const
- * @private
- */
-DirectoryModel.fakeDriveRecentEntry_ = {
-  fullPath: RootDirectory.DRIVE_RECENT,
-  isDirectory: true
-};
-
-/**
- * List of fake entries for special searches.
- *
- * @type {Array.<Object>}
- * @const
- */
-DirectoryModel.FAKE_DRIVE_SPECIAL_SEARCH_ENTRIES = [
-  DirectoryModel.fakeDriveSharedWithMeEntry_,
-  DirectoryModel.fakeDriveRecentEntry_,
-  DirectoryModel.fakeDriveOfflineEntry_
-];
-
-/**
- * DirectoryModel extends cr.EventTarget.
- */
-DirectoryModel.prototype.__proto__ = cr.EventTarget.prototype;
-
-/**
- * Disposes the directory model by removing file watchers.
- */
-DirectoryModel.prototype.dispose = function() {
-  this.fileWatcher_.dispose();
-};
-
-/**
- * @return {cr.ui.ArrayDataModel} Files in the current directory.
- */
-DirectoryModel.prototype.getFileList = function() {
-  return this.currentFileListContext_.fileList;
-};
-
-/**
- * Sort the file list.
- * @param {string} sortField Sort field.
- * @param {string} sortDirection "asc" or "desc".
- */
-DirectoryModel.prototype.sortFileList = function(sortField, sortDirection) {
-  this.getFileList().sort(sortField, sortDirection);
-};
-
-/**
- * @return {cr.ui.ListSelectionModel|cr.ui.ListSingleSelectionModel} Selection
- * in the fileList.
- */
-DirectoryModel.prototype.getFileListSelection = function() {
-  return this.fileListSelection_;
-};
-
-/**
- * @return {RootType} Root type of current root.
- */
-DirectoryModel.prototype.getCurrentRootType = function() {
-  var entry = this.currentDirContents_.getDirectoryEntry();
-  return PathUtil.getRootType(entry ? entry.fullPath : '');
-};
-
-/**
- * @return {string} Root path.
- */
-DirectoryModel.prototype.getCurrentRootPath = function() {
-  var entry = this.currentDirContents_.getDirectoryEntry();
-  return entry ? PathUtil.getRootPath(entry.fullPath) : '';
-};
-
-/**
- * @return {string} Filesystem URL representing the mountpoint for the current
- *     contents.
- */
-DirectoryModel.prototype.getCurrentMountPointUrl = function() {
-  var rootPath = this.getCurrentRootPath();
-  // Special search roots are just showing a search results from DRIVE.
-  if (PathUtil.getRootType(rootPath) == RootType.DRIVE ||
-      PathUtil.isSpecialSearchRoot(rootPath))
-    return util.makeFilesystemUrl(RootDirectory.DRIVE);
-
-  return util.makeFilesystemUrl(rootPath);
-};
-
-/**
- * @return {boolean} on True if offline.
- */
-DirectoryModel.prototype.isDriveOffline = function() {
-  var connection = this.volumeManager_.getDriveConnectionState();
-  return connection.type == util.DriveConnectionType.OFFLINE;
-};
-
-/**
- * TODO(haruki): This actually checks the current root. Fix the method name and
- * related code.
- * @return {boolean} True if the root for the current directory is read only.
- */
-DirectoryModel.prototype.isReadOnly = function() {
-  return this.isPathReadOnly(this.getCurrentRootPath());
-};
-
-/**
- * @return {boolean} True if the a scan is active.
- */
-DirectoryModel.prototype.isScanning = function() {
-  return this.currentDirContents_.isScanning();
-};
-
-/**
- * @return {boolean} True if search is in progress.
- */
-DirectoryModel.prototype.isSearching = function() {
-  return this.currentDirContents_.isSearch();
-};
-
-/**
- * @param {string} path Path to check.
- * @return {boolean} True if the |path| is read only.
- */
-DirectoryModel.prototype.isPathReadOnly = function(path) {
-  // TODO(hidehiko): Migrate this into VolumeInfo.
-  switch (PathUtil.getRootType(path)) {
-    case RootType.REMOVABLE:
-      var volumeInfo = this.volumeManager_.getVolumeInfo(
-          PathUtil.getRootPath(path));
-      // Returns true if the volume is actually read only, or if an error
-      // is found during the mounting.
-      // TODO(hidehiko): Remove "error" check here, by removing error'ed volume
-      // info from VolumeManager.
-      return volumeInfo && (volumeInfo.isReadOnly || !!volumeInfo.error);
-    case RootType.ARCHIVE:
-      return true;
-    case RootType.DOWNLOADS:
-      return false;
-    case RootType.DRIVE:
-      // TODO(haruki): Maybe add DRIVE_OFFLINE as well to allow renaming in the
-      // offline tab.
-      return this.isDriveOffline();
-    default:
-      return true;
-  }
-};
-
-/**
- * Updates the selection by using the updateFunc and publish the change event.
- * If updateFunc returns true, it force to dispatch the change event even if the
- * selection index is not changed.
- *
- * @param {cr.ui.ListSelectionModel|cr.ui.ListSingleSelectionModel} selection
- *     Selection to be updated.
- * @param {function(): boolean} updateFunc Function updating the selection.
- * @private
- */
-DirectoryModel.prototype.updateSelectionAndPublishEvent_ =
-    function(selection, updateFunc) {
-  // Begin change.
-  selection.beginChange();
-
-  // If dispatchNeeded is true, we should ensure the change event is
-  // dispatched.
-  var dispatchNeeded = updateFunc();
-
-  // Check if the change event is dispatched in the endChange function
-  // or not.
-  var eventDispatched = function() { dispatchNeeded = false; };
-  selection.addEventListener('change', eventDispatched);
-  selection.endChange();
-  selection.removeEventListener('change', eventDispatched);
-
-  // If the change event have been already dispatched, dispatchNeeded is false.
-  if (dispatchNeeded) {
-    var event = new Event('change');
-    // The selection status (selected or not) is not changed because
-    // this event is caused by the change of selected item.
-    event.changes = [];
-    selection.dispatchEvent(event);
-  }
-};
-
-/**
- * Invoked when a change in the directory is detected by the watcher.
- * @private
- */
-DirectoryModel.prototype.onWatcherDirectoryChanged_ = function() {
-  this.rescanSoon();
-};
-
-/**
- * Invoked when filters are changed.
- * @private
- */
-DirectoryModel.prototype.onFilterChanged_ = function() {
-  this.rescanSoon();
-};
-
-/**
- * Returns the filter.
- * @return {FileFilter} The file filter.
- */
-DirectoryModel.prototype.getFileFilter = function() {
-  return this.fileFilter_;
-};
-
-/**
- * @return {DirectoryEntry} Current directory.
- */
-DirectoryModel.prototype.getCurrentDirEntry = function() {
-  return this.currentDirContents_.getDirectoryEntry();
-};
-
-/**
- * @return {string} URL of the current directory. or null if unavailable.
- */
-DirectoryModel.prototype.getCurrentDirectoryURL = function() {
-  var entry = this.currentDirContents_.getDirectoryEntry();
-  if (!entry)
-    return null;
-  if (entry === DirectoryModel.fakeDriveOfflineEntry_)
-    return util.makeFilesystemUrl(entry.fullPath);
-  return entry.toURL();
-};
-
-/**
- * @return {string} Path for the current directory, or empty string if the
- *     current directory is not yet set.
- */
-DirectoryModel.prototype.getCurrentDirPath = function() {
-  var entry = this.currentDirContents_.getDirectoryEntry();
-  return entry ? entry.fullPath : '';
-};
-
-/**
- * @return {Array.<string>} File paths of selected files.
- * @private
- */
-DirectoryModel.prototype.getSelectedPaths_ = function() {
-  var indexes = this.fileListSelection_.selectedIndexes;
-  var fileList = this.getFileList();
-  if (fileList) {
-    return indexes.map(function(i) {
-      return fileList.item(i).fullPath;
-    });
-  }
-  return [];
-};
-
-/**
- * @param {Array.<string>} value List of file paths of selected files.
- * @private
- */
-DirectoryModel.prototype.setSelectedPaths_ = function(value) {
-  var indexes = [];
-  var fileList = this.getFileList();
-
-  var safeKey = function(key) {
-    // The transformation must:
-    // 1. Never generate a reserved name ('__proto__')
-    // 2. Keep different keys different.
-    return '#' + key;
-  };
-
-  var hash = {};
-
-  for (var i = 0; i < value.length; i++)
-    hash[safeKey(value[i])] = 1;
-
-  for (var i = 0; i < fileList.length; i++) {
-    if (hash.hasOwnProperty(safeKey(fileList.item(i).fullPath)))
-      indexes.push(i);
-  }
-  this.fileListSelection_.selectedIndexes = indexes;
-};
-
-/**
- * @return {string} Lead item file path.
- * @private
- */
-DirectoryModel.prototype.getLeadPath_ = function() {
-  var index = this.fileListSelection_.leadIndex;
-  return index >= 0 && this.getFileList().item(index).fullPath;
-};
-
-/**
- * @param {string} value The name of new lead index.
- * @private
- */
-DirectoryModel.prototype.setLeadPath_ = function(value) {
-  var fileList = this.getFileList();
-  for (var i = 0; i < fileList.length; i++) {
-    if (fileList.item(i).fullPath === value) {
-      this.fileListSelection_.leadIndex = i;
-      return;
-    }
-  }
-};
-
-/**
- * Schedule rescan with short delay.
- */
-DirectoryModel.prototype.rescanSoon = function() {
-  this.scheduleRescan(SHORT_RESCAN_INTERVAL);
-};
-
-/**
- * Schedule rescan with delay. Designed to handle directory change
- * notification.
- */
-DirectoryModel.prototype.rescanLater = function() {
-  this.scheduleRescan(SIMULTANEOUS_RESCAN_INTERVAL);
-};
-
-/**
- * Schedule rescan with delay. If another rescan has been scheduled does
- * nothing. File operation may cause a few notifications what should cause
- * a single refresh.
- * @param {number} delay Delay in ms after which the rescan will be performed.
- */
-DirectoryModel.prototype.scheduleRescan = function(delay) {
-  if (this.rescanTime_) {
-    if (this.rescanTime_ <= Date.now() + delay)
-      return;
-    clearTimeout(this.rescanTimeoutId_);
-  }
-
-  this.rescanTime_ = Date.now() + delay;
-  this.rescanTimeoutId_ = setTimeout(this.rescan.bind(this), delay);
-};
-
-/**
- * Cancel a rescan on timeout if it is scheduled.
- * @private
- */
-DirectoryModel.prototype.clearRescanTimeout_ = function() {
-  this.rescanTime_ = null;
-  if (this.rescanTimeoutId_) {
-    clearTimeout(this.rescanTimeoutId_);
-    this.rescanTimeoutId_ = null;
-  }
-};
-
-/**
- * Rescan current directory. May be called indirectly through rescanLater or
- * directly in order to reflect user action. Will first cache all the directory
- * contents in an array, then seamlessly substitute the fileList contents,
- * preserving the select element etc.
- *
- * This should be to scan the contents of current directory (or search).
- */
-DirectoryModel.prototype.rescan = function() {
-  this.clearRescanTimeout_();
-  if (this.runningScan_) {
-    this.pendingRescan_ = true;
-    return;
-  }
-
-  var dirContents = this.currentDirContents_.clone();
-  dirContents.setFileList([]);
-
-  var successCallback = (function() {
-    this.replaceDirectoryContents_(dirContents);
-    cr.dispatchSimpleEvent(this, 'rescan-completed');
-  }).bind(this);
-
-  this.scan_(dirContents,
-             successCallback, function() {}, function() {}, function() {});
-};
-
-/**
- * Run scan on the current DirectoryContents. The active fileList is cleared and
- * the entries are added directly.
- *
- * This should be used when changing directory or initiating a new search.
- *
- * @param {DirectoryContentes} newDirContents New DirectoryContents instance to
- *     replace currentDirContents_.
- * @param {function()=} opt_callback Called on success.
- * @private
- */
-DirectoryModel.prototype.clearAndScan_ = function(newDirContents,
-                                                  opt_callback) {
-  if (this.currentDirContents_.isScanning())
-    this.currentDirContents_.cancelScan();
-  this.currentDirContents_ = newDirContents;
-  this.clearRescanTimeout_();
-
-  if (this.pendingScan_)
-    this.pendingScan_ = false;
-
-  if (this.runningScan_) {
-    if (this.runningScan_.isScanning())
-      this.runningScan_.cancelScan();
-    this.runningScan_ = null;
-  }
-
-  var onDone = function() {
-    cr.dispatchSimpleEvent(this, 'scan-completed');
-    if (opt_callback)
-      opt_callback();
-  }.bind(this);
-
-  var onFailed = function() {
-    cr.dispatchSimpleEvent(this, 'scan-failed');
-  }.bind(this);
-
-  var onUpdated = function() {
-    cr.dispatchSimpleEvent(this, 'scan-updated');
-  }.bind(this);
-
-  var onCancelled = function() {
-    cr.dispatchSimpleEvent(this, 'scan-cancelled');
-  }.bind(this);
-
-  // Clear the table, and start scanning.
-  cr.dispatchSimpleEvent(this, 'scan-started');
-  var fileList = this.getFileList();
-  fileList.splice(0, fileList.length);
-  this.scan_(this.currentDirContents_,
-             onDone, onFailed, onUpdated, onCancelled);
-};
-
-/**
- * Perform a directory contents scan. Should be called only from rescan() and
- * clearAndScan_().
- *
- * @param {DirectoryContents} dirContents DirectoryContents instance on which
- *     the scan will be run.
- * @param {function()} successCallback Callback on success.
- * @param {function()} failureCallback Callback on failure.
- * @param {function()} updatedCallback Callback on update. Only on the last
- *     update, {@code successCallback} is called instead of this.
- * @param {function()} cancelledCallback Callback on cancel.
- * @private
- */
-DirectoryModel.prototype.scan_ = function(
-    dirContents,
-    successCallback, failureCallback, updatedCallback, cancelledCallback) {
-  var self = this;
-
-  /**
-   * Runs pending scan if there is one.
-   *
-   * @return {boolean} Did pending scan exist.
-   */
-  var maybeRunPendingRescan = function() {
-    if (self.pendingRescan_) {
-      self.rescanSoon();
-      self.pendingRescan_ = false;
-      return true;
-    }
-    return false;
-  };
-
-  var onSuccess = function() {
-    self.runningScan_ = null;
-    successCallback();
-    self.scanFailures_ = 0;
-    maybeRunPendingRescan();
-  };
-
-  var onFailure = function() {
-    self.runningScan_ = null;
-    self.scanFailures_++;
-    failureCallback();
-
-    if (maybeRunPendingRescan())
-      return;
-
-    if (self.scanFailures_ <= 1)
-      self.rescanLater();
-  };
-
-  this.runningScan_ = dirContents;
-
-  dirContents.addEventListener('scan-completed', onSuccess);
-  dirContents.addEventListener('scan-updated', updatedCallback);
-  dirContents.addEventListener('scan-failed', onFailure);
-  dirContents.addEventListener('scan-cancelled', cancelledCallback);
-  dirContents.scan();
-};
-
-/**
- * @param {DirectoryContents} dirContents DirectoryContents instance.
- * @private
- */
-DirectoryModel.prototype.replaceDirectoryContents_ = function(dirContents) {
-  cr.dispatchSimpleEvent(this, 'begin-update-files');
-  this.updateSelectionAndPublishEvent_(this.fileListSelection_, function() {
-    var selectedPaths = this.getSelectedPaths_();
-    var selectedIndices = this.fileListSelection_.selectedIndexes;
-
-    // Restore leadIndex in case leadName no longer exists.
-    var leadIndex = this.fileListSelection_.leadIndex;
-    var leadPath = this.getLeadPath_();
-
-    this.currentDirContents_ = dirContents;
-    dirContents.replaceContextFileList();
-
-    this.setSelectedPaths_(selectedPaths);
-    this.fileListSelection_.leadIndex = leadIndex;
-    this.setLeadPath_(leadPath);
-
-    // If nothing is selected after update, then select file next to the
-    // latest selection
-    var forceChangeEvent = false;
-    if (this.fileListSelection_.selectedIndexes.length == 0 &&
-        selectedIndices.length != 0) {
-      var maxIdx = Math.max.apply(null, selectedIndices);
-      this.selectIndex(Math.min(maxIdx - selectedIndices.length + 2,
-                                this.getFileList().length) - 1);
-      forceChangeEvent = true;
-    }
-    return forceChangeEvent;
-  }.bind(this));
-
-  cr.dispatchSimpleEvent(this, 'end-update-files');
-};
-
-/**
- * Callback when an entry is changed.
- * @param {util.EntryChangedKind} kind How the entry is changed.
- * @param {Entry} entry The changed entry.
- */
-DirectoryModel.prototype.onEntryChanged = function(kind, entry) {
-  // TODO(hidehiko): We should update directory model even the search result
-  // is shown.
-  var rootType = this.getCurrentRootType();
-  if ((rootType === RootType.DRIVE ||
-       rootType === RootType.DRIVE_SHARED_WITH_ME ||
-       rootType === RootType.DRIVE_RECENT ||
-       rootType === RootType.DRIVE_OFFLINE) &&
-      this.isSearching())
-    return;
-
-  if (kind == util.EntryChangedKind.CREATED) {
-    entry.getParent(function(parentEntry) {
-      if (this.getCurrentDirEntry().fullPath != parentEntry.fullPath) {
-        // Do nothing if current directory changed during async operations.
-        return;
-      }
-      this.currentDirContents_.prefetchMetadata([entry], function() {
-        if (this.getCurrentDirEntry().fullPath != parentEntry.fullPath) {
-          // Do nothing if current directory changed during async operations.
-          return;
-        }
-
-        var index = this.findIndexByEntry_(entry);
-        if (index >= 0)
-          this.getFileList().splice(index, 1, entry);
-        else
-          this.getFileList().push(entry);
-      }.bind(this));
-    }.bind(this));
-  } else {
-    // This is the delete event.
-    var index = this.findIndexByEntry_(entry);
-    if (index >= 0)
-      this.getFileList().splice(index, 1);
-  }
-};
-
-/**
- * @param {Entry} entry The entry to be searched.
- * @return {number} The index in the fileList, or -1 if not found.
- * @private
- */
-DirectoryModel.prototype.findIndexByEntry_ = function(entry) {
-  var fileList = this.getFileList();
-  for (var i = 0; i < fileList.length; i++) {
-    if (util.isSameEntry(fileList.item(i), entry))
-      return i;
-  }
-  return -1;
-};
-
-/**
- * Called when rename is done successfully.
- * Note: conceptually, DirectoryModel should work without this, because entries
- * can be renamed by other systems anytime and Files.app should reflect it
- * correctly.
- * TODO(hidehiko): investigate more background, and remove this if possible.
- *
- * @param {Entry} oldEntry The old entry.
- * @param {Entry} newEntry The new entry.
- * @param {function()} opt_callback Called on completion.
- */
-DirectoryModel.prototype.onRenameEntry = function(
-    oldEntry, newEntry, opt_callback) {
-  this.currentDirContents_.prefetchMetadata([newEntry], function() {
-    // If the current directory is the old entry, then quietly change to the
-    // new one.
-    if (util.isSameEntry(oldEntry, this.getCurrentDirEntry()))
-      this.changeDirectory(newEntry.fullPath);
-
-    // Look for the old entry.
-    // If the entry doesn't exist in the list, it has been updated from
-    // outside (probably by directory rescan).
-    var index = this.findIndexByEntry_(oldEntry);
-    if (index >= 0) {
-      // Update the content list and selection status.
-      var wasSelected = this.fileListSelection_.getIndexSelected(index);
-      this.updateSelectionAndPublishEvent_(this.fileListSelection_, function() {
-        this.fileListSelection_.setIndexSelected(index, false);
-        this.getFileList().splice(index, 1, newEntry);
-        if (wasSelected) {
-          // We re-search the index, because splice may trigger sorting so that
-          // index may be stale.
-          this.fileListSelection_.setIndexSelected(
-              this.findIndexByEntry_(newEntry), true);
-        }
-        return true;
-      }.bind(this));
-    }
-
-    // Run callback, finally.
-    if (opt_callback)
-      opt_callback();
-  }.bind(this));
-};
-
-/**
- * Creates directory and updates the file list.
- *
- * @param {string} name Directory name.
- * @param {function(DirectoryEntry)} successCallback Callback on success.
- * @param {function(FileError)} errorCallback Callback on failure.
- */
-DirectoryModel.prototype.createDirectory = function(name, successCallback,
-                                                    errorCallback) {
-  var entry = this.getCurrentDirEntry();
-  if (!entry) {
-    errorCallback(util.createFileError(FileError.INVALID_MODIFICATION_ERR));
-    return;
-  }
-
-  var onSuccess = function(newEntry) {
-    // Do not change anything or call the callback if current
-    // directory changed.
-    if (entry.fullPath != this.getCurrentDirPath())
-      return;
-
-    var existing = this.getFileList().slice().filter(
-        function(e) {return e.name == name;});
-
-    if (existing.length) {
-      this.selectEntry(name);
-      successCallback(existing[0]);
-    } else {
-      this.fileListSelection_.beginChange();
-      this.getFileList().splice(0, 0, newEntry);
-      this.selectEntry(name);
-      this.fileListSelection_.endChange();
-      successCallback(newEntry);
-    }
-  };
-
-  this.currentDirContents_.createDirectory(name, onSuccess.bind(this),
-                                           errorCallback);
-};
-
-/**
- * Changes directory. Causes 'directory-change' event.
- *
- * @param {string} path New current directory path.
- * @param {function(FileError)=} opt_errorCallback Executed if the change
- *     directory failed.
- */
-DirectoryModel.prototype.changeDirectory = function(path, opt_errorCallback) {
-  if (PathUtil.isSpecialSearchRoot(path)) {
-    this.specialSearch(path, '');
-    return;
-  }
-
-  this.resolveDirectory(path, function(directoryEntry) {
-    this.changeDirectoryEntry_(directoryEntry);
-  }.bind(this), function(error) {
-    console.error('Error changing directory to ' + path + ': ', error);
-    if (opt_errorCallback)
-      opt_errorCallback(error);
-  });
-};
-
-/**
- * Resolves absolute directory path. Handles Drive stub. If the drive is
- * mounting, callbacks will be called after the mount is completed.
- *
- * @param {string} path Path to the directory.
- * @param {function(DirectoryEntry)} successCallback Success callback.
- * @param {function(FileError)} errorCallback Error callback.
- */
-DirectoryModel.prototype.resolveDirectory = function(
-    path, successCallback, errorCallback) {
-  if (PathUtil.getRootType(path) == RootType.DRIVE) {
-    if (!this.volumeManager_.getVolumeInfo(RootDirectory.DRIVE)) {
-      errorCallback(util.createFileError(FileError.NOT_FOUND_ERR));
-      return;
-    }
-  }
-
-  var onError = function(error) {
-    // Handle the special case, when in offline mode, and there are no cached
-    // contents on the C++ side. In such case, let's display the stub.
-    // The INVALID_STATE_ERR error code is returned from the drive filesystem
-    // in such situation.
-    //
-    // TODO(mtomasz, hashimoto): Consider rewriting this logic.
-    //     crbug.com/253464.
-    if (PathUtil.getRootType(path) == RootType.DRIVE &&
-        error.code == FileError.INVALID_STATE_ERR) {
-      successCallback(DirectoryModel.fakeDriveEntry_);
-      return;
-    }
-    errorCallback(error);
-  }.bind(this);
-
-  this.volumeManager_.resolvePath(
-      path,
-      function(entry) {
-        if (entry.isFile) {
-          onError(util.createFileError(FileError.TYPE_MISMATCH_ERR));
-          return;
-        }
-        successCallback(entry);
-      },
-      onError);
-};
-
-/**
- * @param {DirectoryEntry} dirEntry The absolute path to the new directory.
- * @param {function()=} opt_callback Executed if the directory loads
- *     successfully.
- * @private
- */
-DirectoryModel.prototype.changeDirectoryEntrySilent_ = function(dirEntry,
-                                                                opt_callback) {
-  var onScanComplete = function() {
-    if (opt_callback)
-      opt_callback();
-    // For tests that open the dialog to empty directories, everything
-    // is loaded at this point.
-    chrome.test.sendMessage('directory-change-complete');
-  };
-  this.clearAndScan_(
-      DirectoryContents.createForDirectory(this.currentFileListContext_,
-                                           dirEntry),
-      onScanComplete.bind(this));
-};
-
-/**
- * Change the current directory to the directory represented by a
- * DirectoryEntry.
- *
- * Dispatches the 'directory-changed' event when the directory is successfully
- * changed.
- *
- * @param {DirectoryEntry} dirEntry The absolute path to the new directory.
- * @param {function()=} opt_callback Executed if the directory loads
- *     successfully.
- * @private
- */
-DirectoryModel.prototype.changeDirectoryEntry_ = function(
-    dirEntry, opt_callback) {
-  this.fileWatcher_.changeWatchedDirectory(dirEntry, function() {
-    var previous = this.currentDirContents_.getDirectoryEntry();
-    this.clearSearch_();
-    this.changeDirectoryEntrySilent_(dirEntry, opt_callback);
-
-    var e = new Event('directory-changed');
-    e.previousDirEntry = previous;
-    e.newDirEntry = dirEntry;
-    this.dispatchEvent(e);
-  }.bind(this));
-};
-
-/**
- * Creates an object which could say whether directory has changed while it has
- * been active or not. Designed for long operations that should be cancelled
- * if the used change current directory.
- * @return {Object} Created object.
- */
-DirectoryModel.prototype.createDirectoryChangeTracker = function() {
-  var tracker = {
-    dm_: this,
-    active_: false,
-    hasChanged: false,
-
-    start: function() {
-      if (!this.active_) {
-        this.dm_.addEventListener('directory-changed',
-                                  this.onDirectoryChange_);
-        this.active_ = true;
-        this.hasChanged = false;
-      }
-    },
-
-    stop: function() {
-      if (this.active_) {
-        this.dm_.removeEventListener('directory-changed',
-                                     this.onDirectoryChange_);
-        this.active_ = false;
-      }
-    },
-
-    onDirectoryChange_: function(event) {
-      tracker.stop();
-      tracker.hasChanged = true;
-    }
-  };
-  return tracker;
-};
-
-/**
- * Change the state of the model to reflect the specified path (either a
- * file or directory).
- * TODO(hidehiko): This logic should be merged with
- * FileManager.setupCurrentDirectory_.
- *
- * @param {string} path The root path to use.
- * @param {function(string, string, boolean)=} opt_pathResolveCallback Invoked
- *     as soon as the path has been resolved, and called with the base and leaf
- *     portions of the path name, and a flag indicating if the entry exists.
- *     Will be called even if another directory change happened while setupPath
- *     was in progress, but will pass |false| as |exist| parameter.
- */
-DirectoryModel.prototype.setupPath = function(path, opt_pathResolveCallback) {
-  var tracker = this.createDirectoryChangeTracker();
-  tracker.start();
-
-  var self = this;
-  var resolveCallback = function(directoryPath, fileName, exists) {
-    tracker.stop();
-    if (!opt_pathResolveCallback)
-      return;
-    opt_pathResolveCallback(directoryPath, fileName,
-                            exists && !tracker.hasChanged);
-  };
-
-  var changeDirectoryEntry = function(directoryEntry, opt_callback) {
-    tracker.stop();
-    if (!tracker.hasChanged)
-      self.changeDirectoryEntry_(directoryEntry, opt_callback);
-  };
-
-  var EXISTS = true;
-
-  var changeToDefault = function(leafName) {
-    var def = PathUtil.DEFAULT_DIRECTORY;
-    self.resolveDirectory(def, function(directoryEntry) {
-      resolveCallback(def, leafName, !EXISTS);
-      changeDirectoryEntry(directoryEntry);
-    }, function(error) {
-      console.error('Failed to resolve default directory: ' + def, error);
-      resolveCallback('/', leafName, !EXISTS);
-    });
-  };
-
-  var noParentDirectory = function(leafName, error) {
-    console.warn('Can\'t resolve parent directory: ' + path, error);
-    changeToDefault(leafName);
-  };
-
-  if (DirectoryModel.isSystemDirectory(path)) {
-    changeToDefault('');
-    return;
-  }
-
-  this.resolveDirectory(path, function(directoryEntry) {
-    resolveCallback(directoryEntry.fullPath, '', !EXISTS);
-    changeDirectoryEntry(directoryEntry);
-  }, function(error) {
-    // Usually, leaf does not exist, because it's just a suggested file name.
-    var fileExists = error.code == FileError.TYPE_MISMATCH_ERR;
-    var nameDelimiter = path.lastIndexOf('/');
-    var parentDirectoryPath = path.substr(0, nameDelimiter);
-    var leafName = path.substr(nameDelimiter + 1);
-    if (fileExists || error.code == FileError.NOT_FOUND_ERR) {
-      if (DirectoryModel.isSystemDirectory(parentDirectoryPath)) {
-        changeToDefault(leafName);
-        return;
-      }
-      self.resolveDirectory(parentDirectoryPath,
-                            function(parentDirectoryEntry) {
-        var fileName = path.substr(nameDelimiter + 1);
-        resolveCallback(parentDirectoryEntry.fullPath, fileName, fileExists);
-        changeDirectoryEntry(parentDirectoryEntry,
-                             function() {
-                               self.selectEntry(fileName);
-                             });
-      }, noParentDirectory.bind(null, leafName));
-    } else {
-      // Unexpected errors.
-      console.error('Directory resolving error: ', error);
-      changeToDefault(leafName);
-    }
-  });
-};
-
-/**
- * @param {string} name Filename.
- */
-DirectoryModel.prototype.selectEntry = function(name) {
-  var fileList = this.getFileList();
-  for (var i = 0; i < fileList.length; i++) {
-    if (fileList.item(i).name == name) {
-      this.selectIndex(i);
-      return;
-    }
-  }
-};
-
-/**
- * @param {Array.<string>} urls Array of URLs.
- */
-DirectoryModel.prototype.selectUrls = function(urls) {
-  var fileList = this.getFileList();
-  this.fileListSelection_.beginChange();
-  this.fileListSelection_.unselectAll();
-  for (var i = 0; i < fileList.length; i++) {
-    if (urls.indexOf(fileList.item(i).toURL()) >= 0)
-      this.fileListSelection_.setIndexSelected(i, true);
-  }
-  this.fileListSelection_.endChange();
-};
-
-/**
- * @param {number} index Index of file.
- */
-DirectoryModel.prototype.selectIndex = function(index) {
-  // this.focusCurrentList_();
-  if (index >= this.getFileList().length)
-    return;
-
-  // If a list bound with the model it will do scrollIndexIntoView(index).
-  this.fileListSelection_.selectedIndex = index;
-};
-
-/**
- * Called when VolumeInfoList is updated.
- *
- * @param {Event} event Event of VolumeInfoList's 'splice'.
- * @private
- */
-DirectoryModel.prototype.onVolumeInfoListUpdated_ = function(event) {
-  var driveVolume = this.volumeManager_.getVolumeInfo(RootDirectory.DRIVE);
-  if (driveVolume && !driveVolume.error) {
-    var currentDirEntry = this.getCurrentDirEntry();
-    if (currentDirEntry) {
-      if (currentDirEntry === DirectoryModel.fakeDriveEntry_) {
-        // Replace the fake entry by real DirectoryEntry silently.
-        this.volumeManager_.resolvePath(
-            DirectoryModel.fakeDriveEntry_.fullPath,
-            function(entry) {
-              // If the current entry is still fake drive entry, replace it.
-              if (this.getCurrentDirEntry() === DirectoryModel.fakeDriveEntry_)
-                this.changeDirectoryEntrySilent_(entry);
-            },
-            function(error) {});
-      } else if (PathUtil.isSpecialSearchRoot(currentDirEntry.fullPath)) {
-        for (var i = 0; i < event.added.length; i++) {
-          if (event.added[i].volumeType == util.VolumeType.DRIVE) {
-            // If the Drive volume is newly mounted, rescan it.
-            this.rescan();
-            break;
-          }
-        }
-      }
-    }
-  }
-
-  var rootPath = this.getCurrentRootPath();
-  var rootType = PathUtil.getRootType(rootPath);
-
-  // If the path is on drive, reduce to the Drive's mount point.
-  if (rootType === RootType.DRIVE)
-    rootPath = RootDirectory.DRIVE;
-
-  // When the volume where we are is unmounted, fallback to
-  // DEFAULT_DIRECTORY.
-  // Note: during the initialization, rootType can be undefined.
-  if (rootType && !this.volumeManager_.getVolumeInfo(rootPath))
-    this.changeDirectory(PathUtil.DEFAULT_DIRECTORY);
-};
-
-/**
- * @param {string} path Path.
- * @return {boolean} If current directory is system.
- */
-DirectoryModel.isSystemDirectory = function(path) {
-  path = path.replace(/\/+$/, '');
-  return path === RootDirectory.REMOVABLE || path === RootDirectory.ARCHIVE;
-};
-
-/**
- * Check if the root of the given path is mountable or not.
- *
- * @param {string} path Path.
- * @return {boolean} Return true, if the given path is under mountable root.
- *     Otherwise, return false.
- */
-DirectoryModel.isMountableRoot = function(path) {
-  var rootType = PathUtil.getRootType(path);
-  switch (rootType) {
-    case RootType.DOWNLOADS:
-      return false;
-    case RootType.ARCHIVE:
-    case RootType.REMOVABLE:
-    case RootType.DRIVE:
-      return true;
-    default:
-      throw new Error('Unknown root type!');
-  }
-};
-
-/**
- * Performs search and displays results. The search type is dependent on the
- * current directory. If we are currently on drive, server side content search
- * over drive mount point. If the current directory is not on the drive, file
- * name search over current directory will be performed.
- *
- * @param {string} query Query that will be searched for.
- * @param {function(Event)} onSearchRescan Function that will be called when the
- *     search directory is rescanned (i.e. search results are displayed).
- * @param {function()} onClearSearch Function to be called when search state
- *     gets cleared.
- * TODO(olege): Change callbacks to events.
- */
-DirectoryModel.prototype.search = function(query,
-                                           onSearchRescan,
-                                           onClearSearch) {
-  query = query.trimLeft();
-
-  this.clearSearch_();
-
-  var currentDirEntry = this.getCurrentDirEntry();
-  if (!currentDirEntry) {
-    // Not yet initialized. Do nothing.
-    return;
-  }
-
-  if (!query) {
-    if (this.isSearching()) {
-      var newDirContents = DirectoryContents.createForDirectory(
-          this.currentFileListContext_,
-          this.currentDirContents_.getLastNonSearchDirectoryEntry());
-      this.clearAndScan_(newDirContents);
-    }
-    return;
-  }
-
-  this.onSearchCompleted_ = onSearchRescan;
-  this.onClearSearch_ = onClearSearch;
-
-  this.addEventListener('scan-completed', this.onSearchCompleted_);
-
-  // If we are offline, let's fallback to file name search inside dir.
-  // A search initiated from directories in Drive or special search results
-  // should trigger Drive search.
-  var newDirContents;
-  if (!this.isDriveOffline() &&
-      PathUtil.isDriveBasedPath(currentDirEntry.fullPath)) {
-    // Drive search is performed over the whole drive, so pass  drive root as
-    // |directoryEntry|.
-    newDirContents = DirectoryContents.createForDriveSearch(
-        this.currentFileListContext_,
-        currentDirEntry,
-        this.currentDirContents_.getLastNonSearchDirectoryEntry(),
-        query);
-  } else {
-    newDirContents = DirectoryContents.createForLocalSearch(
-        this.currentFileListContext_, currentDirEntry, query);
-  }
-  this.clearAndScan_(newDirContents);
-};
-
-/**
- * Performs special search and displays results. e.g. Drive files available
- * offline, shared-with-me files, recently modified files.
- * @param {string} path Path string representing special search. See fake
- *     entries in PathUtil.RootDirectory.
- * @param {string=} opt_query Query string used for the search.
- */
-DirectoryModel.prototype.specialSearch = function(path, opt_query) {
-  var query = opt_query || '';
-
-  this.clearSearch_();
-
-  this.onSearchCompleted_ = null;
-  this.onClearSearch_ = null;
-
-  var onDriveDirectoryResolved = function(driveRoot) {
-    if (!driveRoot || driveRoot == DirectoryModel.fakeDriveEntry_) {
-      // Drive root not available or not ready. onVolumeInfoListUpdated_()
-      // handles the rescan if necessary.
-      driveRoot = null;
-    }
-
-    var specialSearchType = PathUtil.getRootType(path);
-    var searchOption;
-    var dirEntry;
-    if (specialSearchType == RootType.DRIVE_OFFLINE) {
-      dirEntry = DirectoryModel.fakeDriveOfflineEntry_;
-      searchOption =
-          DriveMetadataSearchContentScanner.SearchType.SEARCH_OFFLINE;
-    } else if (specialSearchType == RootType.DRIVE_SHARED_WITH_ME) {
-      dirEntry = DirectoryModel.fakeDriveSharedWithMeEntry_;
-      searchOption =
-          DriveMetadataSearchContentScanner.SearchType.SEARCH_SHARED_WITH_ME;
-    } else if (specialSearchType == RootType.DRIVE_RECENT) {
-      dirEntry = DirectoryModel.fakeDriveRecentEntry_;
-      searchOption =
-          DriveMetadataSearchContentScanner.SearchType.SEARCH_RECENT_FILES;
-
-    } else {
-      // Unknown path.
-      this.changeDirectory(PathUtil.DEFAULT_DIRECTORY);
-      return;
-    }
-
-    var newDirContents = DirectoryContents.createForDriveMetadataSearch(
-        this.currentFileListContext_,
-        dirEntry, driveRoot, query, searchOption);
-    var previous = this.currentDirContents_.getDirectoryEntry();
-    this.clearAndScan_(newDirContents);
-
-    var e = new Event('directory-changed');
-    e.previousDirEntry = previous;
-    e.newDirEntry = dirEntry;
-    this.dispatchEvent(e);
-  }.bind(this);
-
-  this.resolveDirectory(DirectoryModel.fakeDriveEntry_.fullPath,
-                        onDriveDirectoryResolved /* success */,
-                        function() {} /* failed */);
-};
-
-/**
- * In case the search was active, remove listeners and send notifications on
- * its canceling.
- * @private
- */
-DirectoryModel.prototype.clearSearch_ = function() {
-  if (!this.isSearching())
-    return;
-
-  if (this.onSearchCompleted_) {
-    this.removeEventListener('scan-completed', this.onSearchCompleted_);
-    this.onSearchCompleted_ = null;
-  }
-
-  if (this.onClearSearch_) {
-    this.onClearSearch_();
-    this.onClearSearch_ = null;
-  }
-};