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

chrome/browser/resources/file_manager/js/file_operation_manager.js

-// Copyright 2013 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';
-
-/**
- * Utilities for FileOperationManager.
- */
-var fileOperationUtil = {};
-
-/**
- * Simple wrapper for util.deduplicatePath. On error, this method translates
- * the FileError to FileOperationManager.Error object.
- *
- * @param {DirectoryEntry} dirEntry The target directory entry.
- * @param {string} relativePath The path to be deduplicated.
- * @param {function(string)} successCallback Callback run with the deduplicated
- *     path on success.
- * @param {function(FileOperationManager.Error)} errorCallback Callback run on
- *     error.
- */
-fileOperationUtil.deduplicatePath = function(
-    dirEntry, relativePath, successCallback, errorCallback) {
-  util.deduplicatePath(
-      dirEntry, relativePath, successCallback,
-      function(err) {
-        var onFileSystemError = function(error) {
-          errorCallback(new FileOperationManager.Error(
-              util.FileOperationErrorType.FILESYSTEM_ERROR, error));
-        };
-
-        if (err.code == FileError.PATH_EXISTS_ERR) {
-          // Failed to uniquify the file path. There should be an existing
-          // entry, so return the error with it.
-          util.resolvePath(
-              dirEntry, relativePath,
-              function(entry) {
-                errorCallback(new FileOperationManager.Error(
-                    util.FileOperationErrorType.TARGET_EXISTS, entry));
-              },
-              onFileSystemError);
-          return;
-        }
-        onFileSystemError(err);
-      });
-};
-
-/**
- * Traverses files/subdirectories of the given entry, and returns them.
- * In addition, this method annotate the size of each entry. The result will
- * include the entry itself.
- *
- * @param {Entry} entry The root Entry for traversing.
- * @param {function(Array.<Entry>)} successCallback Called when the traverse
- *     is successfully done with the array of the entries.
- * @param {function(FileError)} errorCallback Called on error with the first
- *     occurred error (i.e. following errors will just be discarded).
- */
-fileOperationUtil.resolveRecursively = function(
-    entry, successCallback, errorCallback) {
-  var result = [];
-  var error = null;
-  var numRunningTasks = 0;
-
-  var maybeInvokeCallback = function() {
-    // If there still remain some running tasks, wait their finishing.
-    if (numRunningTasks > 0)
-      return;
-
-    if (error)
-      errorCallback(error);
-    else
-      successCallback(result);
-  };
-
-  // The error handling can be shared.
-  var onError = function(fileError) {
-    // If this is the first error, remember it.
-    if (!error)
-      error = fileError;
-    --numRunningTasks;
-    maybeInvokeCallback();
-  };
-
-  var process = function(entry) {
-    numRunningTasks++;
-    result.push(entry);
-    if (entry.isDirectory) {
-      // The size of a directory is 1 bytes here, so that the progress bar
-      // will work smoother.
-      // TODO(hidehiko): Remove this hack.
-      entry.size = 1;
-
-      // Recursively traverse children.
-      var reader = entry.createReader();
-      reader.readEntries(
-          function processSubEntries(subEntries) {
-            if (error || subEntries.length == 0) {
-              // If an error is found already, or this is the completion
-              // callback, then finish the process.
-              --numRunningTasks;
-              maybeInvokeCallback();
-              return;
-            }
-
-            for (var i = 0; i < subEntries.length; i++)
-              process(subEntries[i]);
-
-            // Continue to read remaining children.
-            reader.readEntries(processSubEntries, onError);
-          },
-          onError);
-    } else {
-      // For a file, annotate the file size.
-      entry.getMetadata(function(metadata) {
-        entry.size = metadata.size;
-        --numRunningTasks;
-        maybeInvokeCallback();
-      }, onError);
-    }
-  };
-
-  process(entry);
-};
-
-/**
- * Copies source to parent with the name newName recursively.
- * This should work very similar to FileSystem API's copyTo. The difference is;
- * - The progress callback is supported.
- * - The cancellation is supported.
- *
- * @param {Entry} source The entry to be copied.
- * @param {DirectoryEntry} parent The entry of the destination directory.
- * @param {string} newName The name of copied file.
- * @param {function(string, string)} entryChangedCallback
- *     Callback invoked when an entry is created with the source url and
- *     the destination url.
- * @param {function(string, number)} progressCallback Callback invoked
- *     periodically during the copying. It takes the source url and the
- *     processed bytes of it.
- * @param {function(string)} successCallback Callback invoked when the copy
- *     is successfully done with the url of the created entry.
- * @param {function(FileError)} errorCallback Callback invoked when an error
- *     is found.
- * @return {function()} Callback to cancel the current file copy operation.
- *     When the cancel is done, errorCallback will be called. The returned
- *     callback must not be called more than once.
- */
-fileOperationUtil.copyTo = function(
-    source, parent, newName, entryChangedCallback, progressCallback,
-    successCallback, errorCallback) {
-  var copyId = null;
-  var pendingCallbacks = [];
-
-  var onCopyProgress = function(progressCopyId, status) {
-    if (copyId == null) {
-      // If the copyId is not yet available, wait for it.
-      pendingCallbacks.push(
-          onCopyProgress.bind(null, progressCopyId, status));
-      return;
-    }
-
-    // This is not what we're interested in.
-    if (progressCopyId != copyId)
-      return;
-
-    switch (status.type) {
-      case 'begin_copy_entry':
-        break;
-
-      case 'end_copy_entry':
-        entryChangedCallback(status.sourceUrl, status.destinationUrl);
-        break;
-
-      case 'progress':
-        progressCallback(status.sourceUrl, status.size);
-        break;
-
-      case 'success':
-        chrome.fileBrowserPrivate.onCopyProgress.removeListener(onCopyProgress);
-        successCallback(status.destinationUrl);
-        break;
-
-      case 'error':
-        chrome.fileBrowserPrivate.onCopyProgress.removeListener(onCopyProgress);
-        errorCallback(util.createFileError(status.error));
-        break;
-
-      default:
-        // Found unknown state. Cancel the task, and return an error.
-        console.error('Unknown progress type: ' + status.type);
-        chrome.fileBrowserPrivate.onCopyProgress.removeListener(onCopyProgress);
-        chrome.fileBrowserPrivate.cancelCopy(copyId);
-        errorCallback(util.createFileError(FileError.INVALID_STATE_ERR));
-    }
-  };
-
-  // Register the listener before calling startCopy. Otherwise some events
-  // would be lost.
-  chrome.fileBrowserPrivate.onCopyProgress.addListener(onCopyProgress);
-
-  // Then starts the copy.
-  chrome.fileBrowserPrivate.startCopy(
-      source.toURL(), parent.toURL(), newName, function(startCopyId) {
-        // last error contains the FileError code on error.
-        if (chrome.runtime.lastError) {
-          // Unsubscribe the progress listener.
-          chrome.fileBrowserPrivate.onCopyProgress.removeListener(
-              onCopyProgress);
-          errorCallback(util.createFileError(
-              Integer.parseInt(chrome.runtime.lastError, 10)));
-          return;
-        }
-
-        copyId = startCopyId;
-        for (var i = 0; i < pendingCallbacks.length; i++) {
-          pendingCallbacks[i]();
-        }
-      });
-
-  return function() {
-    // If copyId is not yet available, wait for it.
-    if (copyId == null) {
-      pendingCallbacks.push(function() {
-        chrome.fileBrowserPrivate.cancelCopy(copyId);
-      });
-      return;
-    }
-
-    chrome.fileBrowserPrivate.cancelCopy(copyId);
-  };
-};
-
-/**
- * Thin wrapper of chrome.fileBrowserPrivate.zipSelection to adapt its
- * interface similar to copyTo().
- *
- * @param {Array.<Entry>} sources The array of entries to be archived.
- * @param {DirectoryEntry} parent The entry of the destination directory.
- * @param {string} newName The name of the archive to be created.
- * @param {function(FileEntry)} successCallback Callback invoked when the
- *     operation is successfully done with the entry of the created archive.
- * @param {function(FileError)} errorCallback Callback invoked when an error
- *     is found.
- */
-fileOperationUtil.zipSelection = function(
-    sources, parent, newName, successCallback, errorCallback) {
-  chrome.fileBrowserPrivate.zipSelection(
-      parent.toURL(),
-      sources.map(function(e) { return e.toURL(); }),
-      newName, function(success) {
-        if (!success) {
-          // Failed to create a zip archive.
-          errorCallback(
-              util.createFileError(FileError.INVALID_MODIFICATION_ERR));
-          return;
-        }
-
-        // Returns the created entry via callback.
-        parent.getFile(
-            newName, {create: false}, successCallback, errorCallback);
-      });
-};
-
-/**
- * @constructor
- */
-function FileOperationManager() {
-  this.copyTasks_ = [];
-  this.deleteTasks_ = [];
-  this.cancelObservers_ = [];
-  this.cancelRequested_ = false;
-  this.cancelCallback_ = null;
-  this.unloadTimeout_ = null;
-  this.taskIdCounter_ = 0;
-
-  this.eventRouter_ = new FileOperationManager.EventRouter();
-
-  Object.seal(this);
-}
-
-/**
- * Get FileOperationManager instance. In case is hasn't been initialized, a new
- * instance is created.
- *
- * @return {FileOperationManager} A FileOperationManager instance.
- */
-FileOperationManager.getInstance = function() {
-  if (!FileOperationManager.instance_)
-    FileOperationManager.instance_ = new FileOperationManager();
-
-  return FileOperationManager.instance_;
-};
-
-/**
- * Manages Event dispatching.
- * Currently this can send three types of events: "copy-progress",
- * "copy-operation-completed" and "delete".
- *
- * TODO(hidehiko): Reorganize the event dispatching mechanism.
- * @constructor
- * @extends {cr.EventTarget}
- */
-FileOperationManager.EventRouter = function() {
-};
-
-/**
- * Extends cr.EventTarget.
- */
-FileOperationManager.EventRouter.prototype.__proto__ = cr.EventTarget.prototype;
-
-/**
- * Dispatches a simple "copy-progress" event with reason and current
- * FileOperationManager status. If it is an ERROR event, error should be set.
- *
- * @param {string} reason Event type. One of "BEGIN", "PROGRESS", "SUCCESS",
- *     "ERROR" or "CANCELLED". TODO(hidehiko): Use enum.
- * @param {Object} status Current FileOperationManager's status. See also
- *     FileOperationManager.getStatus().
- * @param {string} taskId ID of task related with the event.
- * @param {FileOperationManager.Error=} opt_error The info for the error. This
- *     should be set iff the reason is "ERROR".
- */
-FileOperationManager.EventRouter.prototype.sendProgressEvent = function(
-    reason, status, taskId, opt_error) {
-  var event = new Event('copy-progress');
-  event.reason = reason;
-  event.status = status;
-  event.taskId = taskId;
-  if (opt_error)
-    event.error = opt_error;
-  this.dispatchEvent(event);
-};
-
-/**
- * Dispatches an event to notify that an entry is changed (created or deleted).
- * @param {util.EntryChangedKind} kind The enum to represent if the entry is
- *     created or deleted.
- * @param {Entry} entry The changed entry.
- */
-FileOperationManager.EventRouter.prototype.sendEntryChangedEvent = function(
-    kind, entry) {
-  var event = new Event('entry-changed');
-  event.kind = kind;
-  event.entry = entry;
-  this.dispatchEvent(event);
-};
-
-/**
- * Dispatches an event to notify entries are changed for delete task.
- *
- * @param {string} reason Event type. One of "BEGIN", "PROGRESS", "SUCCESS",
- *     or "ERROR". TODO(hidehiko): Use enum.
- * @param {Array.<string>} urls An array of URLs which are affected by delete
- *     operation.
- * @param {string} taskId ID of task related with the event.
- */
-FileOperationManager.EventRouter.prototype.sendDeleteEvent = function(
-    reason, urls, taskId) {
-  var event = new Event('delete');
-  event.reason = reason;
-  event.urls = urls;
-  this.dispatchEvent(event);
-};
-
-/**
- * A record of a queued copy operation.
- *
- * Multiple copy operations may be queued at any given time.  Additional
- * Tasks may be added while the queue is being serviced.  Though a
- * cancel operation cancels everything in the queue.
- *
- * @param {util.FileOperationType} operationType The type of this operation.
- * @param {Array.<Entry>} sourceEntries Array of source entries.
- * @param {DirectoryEntry} targetDirEntry Target directory.
- * @constructor
- */
-FileOperationManager.Task = function(
-    operationType, sourceEntries, targetDirEntry) {
-  this.operationType = operationType;
-  this.sourceEntries = sourceEntries;
-  this.targetDirEntry = targetDirEntry;
-
-  /**
-   * An array of map from url to Entry being processed.
-   * @type {Array.<Object<string, Entry>>}
-   */
-  this.processingEntries = null;
-
-  /**
-   * Total number of bytes to be processed. Filled in initialize().
-   * @type {number}
-   */
-  this.totalBytes = 0;
-
-  /**
-   * Total number of already processed bytes. Updated periodically.
-   * @type {number}
-   */
-  this.processedBytes = 0;
-
-  this.deleteAfterCopy = false;
-
-  /**
-   * Set to true when cancel is requested.
-   * @private {boolean}
-   */
-  this.cancelRequested_ = false;
-
-  /**
-   * Callback to cancel the running process.
-   * @private {function()}
-   */
-  this.cancelCallback_ = null;
-
-  // TODO(hidehiko): After we support recursive copy, we don't need this.
-  // If directory already exists, we try to make a copy named 'dir (X)',
-  // where X is a number. When we do this, all subsequent copies from
-  // inside the subtree should be mapped to the new directory name.
-  // For example, if 'dir' was copied as 'dir (1)', then 'dir\file.txt' should
-  // become 'dir (1)\file.txt'.
-  this.renamedDirectories_ = [];
-};
-
-/**
- * @param {function()} callback When entries resolved.
- */
-FileOperationManager.Task.prototype.initialize = function(callback) {
-};
-
-/**
- * Updates copy progress status for the entry.
- *
- * @param {number} size Number of bytes that has been copied since last update.
- */
-FileOperationManager.Task.prototype.updateFileCopyProgress = function(size) {
-  this.completedBytes += size;
-};
-
-/**
- * Requests cancellation of this task.
- * When the cancellation is done, it is notified via callbacks of run().
- */
-FileOperationManager.Task.prototype.requestCancel = function() {
-  this.cancelRequested_ = true;
-  if (this.cancelCallback_) {
-    this.cancelCallback_();
-    this.cancelCallback_ = null;
-  }
-};
-
-/**
- * Runs the task. Sub classes must implement this method.
- *
- * @param {function(util.EntryChangedKind, Entry)} entryChangedCallback
- *     Callback invoked when an entry is changed.
- * @param {function()} progressCallback Callback invoked periodically during
- *     the operation.
- * @param {function()} successCallback Callback run on success.
- * @param {function(FileOperationManager.Error)} errorCallback Callback run on
- *     error.
- */
-FileOperationManager.Task.prototype.run = function(
-    entryChangedCallback, progressCallback, successCallback, errorCallback) {
-};
-
-/**
- * Get states of the task.
- * TOOD(hirono): Removes this method and sets a task to progress events.
- * @return {object} Status object.
- */
-FileOperationManager.Task.prototype.getStatus = function() {
-  var numRemainingItems = this.countRemainingItems();
-  return {
-    operationType: this.operationType,
-    numRemainingItems: numRemainingItems,
-    totalBytes: this.totalBytes,
-    processedBytes: this.processedBytes,
-    processingEntry: this.getSingleEntry()
-  };
-};
-
-/**
- * Counts the number of remaining items.
- * @return {number} Number of remaining items.
- */
-FileOperationManager.Task.prototype.countRemainingItems = function() {
-  var count = 0;
-  for (var i = 0; i < this.processingEntries.length; i++) {
-    for (var url in this.processingEntries[i]) {
-      count++;
-    }
-  }
-  return count;
-};
-
-/**
- * Obtains the single processing entry. If there are multiple processing
- * entries, it returns null.
- * @return {Entry} First entry.
- */
-FileOperationManager.Task.prototype.getSingleEntry = function() {
-  if (this.countRemainingItems() !== 1)
-    return null;
-  for (var i = 0; i < this.processingEntries.length; i++) {
-    var entryMap = this.processingEntries[i];
-    for (var name in entryMap)
-      return entryMap[name];
-  }
-  return null;
-};
-
-/**
- * Task to copy entries.
- *
- * @param {Array.<Entry>} sourceEntries Array of source entries.
- * @param {DirectoryEntry} targetDirEntry Target directory.
- * @constructor
- * @extends {FileOperationManager.Task}
- */
-FileOperationManager.CopyTask = function(sourceEntries, targetDirEntry) {
-  FileOperationManager.Task.call(
-      this, util.FileOperationType.COPY, sourceEntries, targetDirEntry);
-};
-
-/**
- * Extends FileOperationManager.Task.
- */
-FileOperationManager.CopyTask.prototype.__proto__ =
-    FileOperationManager.Task.prototype;
-
-/**
- * Initializes the CopyTask.
- * @param {function()} callback Called when the initialize is completed.
- */
-FileOperationManager.CopyTask.prototype.initialize = function(callback) {
-  var group = new AsyncUtil.Group();
-  // Correct all entries to be copied for status update.
-  this.processingEntries = [];
-  for (var i = 0; i < this.sourceEntries.length; i++) {
-    group.add(function(index, callback) {
-      fileOperationUtil.resolveRecursively(
-          this.sourceEntries[index],
-          function(resolvedEntries) {
-            var resolvedEntryMap = {};
-            for (var j = 0; j < resolvedEntries.length; ++j) {
-              var entry = resolvedEntries[j];
-              entry.processedBytes = 0;
-              resolvedEntryMap[entry.toURL()] = entry;
-            }
-            this.processingEntries[index] = resolvedEntryMap;
-            callback();
-          }.bind(this),
-          function(error) {
-            console.error(
-                'Failed to resolve for copy: %s',
-                util.getFileErrorMnemonic(error.code));
-          });
-    }.bind(this, i));
-  }
-
-  group.run(function() {
-    // Fill totalBytes.
-    this.totalBytes = 0;
-    for (var i = 0; i < this.processingEntries.length; i++) {
-      for (var url in this.processingEntries[i])
-        this.totalBytes += this.processingEntries[i][url].size;
-    }
-
-    callback();
-  }.bind(this));
-};
-
-/**
- * Copies all entries to the target directory.
- * Note: this method contains also the operation of "Move" due to historical
- * reason.
- *
- * @param {function(util.EntryChangedKind, Entry)} entryChangedCallback
- *     Callback invoked when an entry is changed.
- * @param {function()} progressCallback Callback invoked periodically during
- *     the copying.
- * @param {function()} successCallback On success.
- * @param {function(FileOperationManager.Error)} errorCallback On error.
- * @override
- */
-FileOperationManager.CopyTask.prototype.run = function(
-    entryChangedCallback, progressCallback, successCallback, errorCallback) {
-  // TODO(hidehiko): We should be able to share the code to iterate on entries
-  // with serviceMoveTask_().
-  if (this.sourceEntries.length == 0) {
-    successCallback();
-    return;
-  }
-
-  // TODO(hidehiko): Delete after copy is the implementation of Move.
-  // Migrate the part into MoveTask.run().
-  var deleteOriginals = function() {
-    var count = this.sourceEntries.length;
-
-    var onEntryDeleted = function(entry) {
-      entryChangedCallback(util.EntryChangedKind.DELETED, entry);
-      count--;
-      if (!count)
-        successCallback();
-    };
-
-    var onFilesystemError = function(err) {
-      errorCallback(new FileOperationManager.Error(
-          util.FileOperationErrorType.FILESYSTEM_ERROR, err));
-    };
-
-    for (var i = 0; i < this.sourceEntries.length; i++) {
-      var entry = this.sourceEntries[i];
-      util.removeFileOrDirectory(
-          entry, onEntryDeleted.bind(null, entry), onFilesystemError);
-    }
-  }.bind(this);
-
-  AsyncUtil.forEach(
-      this.sourceEntries,
-      function(callback, entry, index) {
-        if (this.cancelRequested_) {
-          errorCallback(new FileOperationManager.Error(
-              util.FileOperationErrorType.FILESYSTEM_ERROR,
-              util.createFileError(FileError.ABORT_ERR)));
-          return;
-        }
-        progressCallback();
-        this.cancelCallback_ = FileOperationManager.CopyTask.processEntry_(
-            entry, this.targetDirEntry,
-            function(sourceUrl, destinationUrl) {
-              // Finalize the entry's progress state.
-              var entry = this.processingEntries[index][sourceUrl];
-              if (entry) {
-                this.processedBytes += entry.size - entry.processedBytes;
-                progressCallback();
-                delete this.processingEntries[index][sourceUrl];
-              }
-
-              webkitResolveLocalFileSystemURL(
-                  destinationUrl, function(destinationEntry) {
-                    entryChangedCallback(
-                        util.EntryChangedKind.CREATED, destinationEntry);
-                  });
-            }.bind(this),
-            function(source_url, size) {
-              var entry = this.processingEntries[index][source_url];
-              if (entry) {
-                this.processedBytes += size - entry.processedBytes;
-                entry.processedBytes = size;
-                progressCallback();
-              }
-            }.bind(this),
-            function() {
-              this.cancelCallback_ = null;
-              callback();
-            }.bind(this),
-            function(error) {
-              this.cancelCallback_ = null;
-              errorCallback(error);
-            }.bind(this));
-      },
-      function() {
-        if (this.deleteAfterCopy) {
-          deleteOriginals();
-        } else {
-          successCallback();
-        }
-      }.bind(this),
-      this);
-};
-
-/**
- * Copies the source entry to the target directory.
- *
- * @param {Entry} sourceEntry An entry to be copied.
- * @param {DirectoryEntry} destinationEntry The entry which will contain the
- *     copied entry.
- * @param {function(string, string)} entryChangedCallback
- *     Callback invoked when an entry is created with the source url and
- *     the destination url.
- * @param {function(string, number)} progressCallback Callback invoked
- *     periodically during the copying.
- * @param {function()} successCallback On success.
- * @param {function(FileOperationManager.Error)} errorCallback On error.
- * @return {function()} Callback to cancel the current file copy operation.
- *     When the cancel is done, errorCallback will be called. The returned
- *     callback must not be called more than once.
- * @private
- */
-FileOperationManager.CopyTask.processEntry_ = function(
-    sourceEntry, destinationEntry, entryChangedCallback, progressCallback,
-    successCallback, errorCallback) {
-  var cancelRequested = false;
-  var cancelCallback = null;
-  fileOperationUtil.deduplicatePath(
-      destinationEntry, sourceEntry.name,
-      function(destinationName) {
-        if (cancelRequested) {
-          errorCallback(new FileOperationManager.Error(
-              util.FileOperationErrorType.FILESYSTEM_ERROR,
-              util.createFileError(FileError.ABORT_ERR)));
-          return;
-        }
-
-        cancelCallback = fileOperationUtil.copyTo(
-            sourceEntry, destinationEntry, destinationName,
-            entryChangedCallback, progressCallback,
-            function(entry) {
-              cancelCallback = null;
-              successCallback();
-            },
-            function(error) {
-              cancelCallback = null;
-              errorCallback(new FileOperationManager.Error(
-                  util.FileOperationErrorType.FILESYSTEM_ERROR, error));
-            });
-      },
-      errorCallback);
-
-  return function() {
-    cancelRequested = true;
-    if (cancelCallback) {
-      cancelCallback();
-      cancelCallback = null;
-    }
-  };
-};
-
-/**
- * Task to move entries.
- *
- * @param {Array.<Entry>} sourceEntries Array of source entries.
- * @param {DirectoryEntry} targetDirEntry Target directory.
- * @constructor
- * @extends {FileOperationManager.Task}
- */
-FileOperationManager.MoveTask = function(sourceEntries, targetDirEntry) {
-  FileOperationManager.Task.call(
-      this, util.FileOperationType.MOVE, sourceEntries, targetDirEntry);
-};
-
-/**
- * Extends FileOperationManager.Task.
- */
-FileOperationManager.MoveTask.prototype.__proto__ =
-    FileOperationManager.Task.prototype;
-
-/**
- * Initializes the MoveTask.
- * @param {function()} callback Called when the initialize is completed.
- */
-FileOperationManager.MoveTask.prototype.initialize = function(callback) {
-  // This may be moving from search results, where it fails if we
-  // move parent entries earlier than child entries. We should
-  // process the deepest entry first. Since move of each entry is
-  // done by a single moveTo() call, we don't need to care about the
-  // recursive traversal order.
-  this.sourceEntries.sort(function(entry1, entry2) {
-    return entry2.fullPath.length - entry1.fullPath.length;
-  });
-
-  this.processingEntries = [];
-  for (var i = 0; i < this.sourceEntries.length; i++) {
-    var processingEntryMap = {};
-    var entry = this.sourceEntries[i];
-
-    // The move should be done with updating the metadata. So here we assume
-    // all the file size is 1 byte. (Avoiding 0, so that progress bar can
-    // move smoothly).
-    // TODO(hidehiko): Remove this hack.
-    entry.size = 1;
-    processingEntryMap[entry.toURL()] = entry;
-    this.processingEntries[i] = processingEntryMap;
-  }
-
-  callback();
-};
-
-/**
- * Moves all entries in the task.
- *
- * @param {function(util.EntryChangedKind, Entry)} entryChangedCallback
- *     Callback invoked when an entry is changed.
- * @param {function()} progressCallback Callback invoked periodically during
- *     the moving.
- * @param {function()} successCallback On success.
- * @param {function(FileOperationManager.Error)} errorCallback On error.
- * @override
- */
-FileOperationManager.MoveTask.prototype.run = function(
-    entryChangedCallback, progressCallback, successCallback, errorCallback) {
-  if (this.sourceEntries.length == 0) {
-    successCallback();
-    return;
-  }
-
-  AsyncUtil.forEach(
-      this.sourceEntries,
-      function(callback, entry, index) {
-        if (this.cancelRequested_) {
-          errorCallback(new FileOperationManager.Error(
-              util.FileOperationErrorType.FILESYSTEM_ERROR,
-              util.createFileError(FileError.ABORT_ERR)));
-          return;
-        }
-        progressCallback();
-        FileOperationManager.MoveTask.processEntry_(
-            entry, this.targetDirEntry, entryChangedCallback,
-            function() {
-              // Erase the processing entry.
-              this.processingEntries[index] = {};
-              this.processedBytes++;
-              callback();
-            }.bind(this),
-            errorCallback);
-      },
-      function() {
-        successCallback();
-      }.bind(this),
-      this);
-};
-
-/**
- * Moves the sourceEntry to the targetDirEntry in this task.
- *
- * @param {Entry} sourceEntry An entry to be moved.
- * @param {DirectoryEntry} destinationEntry The entry of the destination
- *     directory.
- * @param {function(util.EntryChangedKind, Entry)} entryChangedCallback
- *     Callback invoked when an entry is changed.
- * @param {function()} successCallback On success.
- * @param {function(FileOperationManager.Error)} errorCallback On error.
- * @private
- */
-FileOperationManager.MoveTask.processEntry_ = function(
-    sourceEntry, destinationEntry, entryChangedCallback, successCallback,
-    errorCallback) {
-  fileOperationUtil.deduplicatePath(
-      destinationEntry,
-      sourceEntry.name,
-      function(destinationName) {
-        sourceEntry.moveTo(
-            destinationEntry, destinationName,
-            function(movedEntry) {
-              entryChangedCallback(util.EntryChangedKind.CREATED, movedEntry);
-              entryChangedCallback(util.EntryChangedKind.DELETED, sourceEntry);
-              successCallback();
-            },
-            function(error) {
-              errorCallback(new FileOperationManager.Error(
-                  util.FileOperationErrorType.FILESYSTEM_ERROR, error));
-            });
-      },
-      errorCallback);
-};
-
-/**
- * Task to create a zip archive.
- *
- * @param {Array.<Entry>} sourceEntries Array of source entries.
- * @param {DirectoryEntry} targetDirEntry Target directory.
- * @param {DirectoryEntry} zipBaseDirEntry Base directory dealt as a root
- *     in ZIP archive.
- * @constructor
- * @extends {FileOperationManager.Task}
- */
-FileOperationManager.ZipTask = function(
-    sourceEntries, targetDirEntry, zipBaseDirEntry) {
-  FileOperationManager.Task.call(
-      this, util.FileOperationType.ZIP, sourceEntries, targetDirEntry);
-  this.zipBaseDirEntry = zipBaseDirEntry;
-};
-
-/**
- * Extends FileOperationManager.Task.
- */
-FileOperationManager.ZipTask.prototype.__proto__ =
-    FileOperationManager.Task.prototype;
-
-
-/**
- * Initializes the ZipTask.
- * @param {function()} callback Called when the initialize is completed.
- */
-FileOperationManager.ZipTask.prototype.initialize = function(callback) {
-  var resolvedEntryMap = {};
-  var group = new AsyncUtil.Group();
-  for (var i = 0; i < this.sourceEntries.length; i++) {
-    group.add(function(index, callback) {
-      fileOperationUtil.resolveRecursively(
-          this.sourceEntries[index],
-          function(entries) {
-            for (var j = 0; j < entries.length; j++)
-              resolvedEntryMap[entries[j].toURL()] = entries[j];
-            callback();
-          },
-          function(error) {});
-    }.bind(this, i));
-  }
-
-  group.run(function() {
-    // For zip archiving, all the entries are processed at once.
-    this.processingEntries = [resolvedEntryMap];
-
-    this.totalBytes = 0;
-    for (var url in resolvedEntryMap)
-      this.totalBytes += resolvedEntryMap[url].size;
-
-    callback();
-  }.bind(this));
-};
-
-/**
- * Runs a zip file creation task.
- *
- * @param {function(util.EntryChangedKind, Entry)} entryChangedCallback
- *     Callback invoked when an entry is changed.
- * @param {function()} progressCallback Callback invoked periodically during
- *     the moving.
- * @param {function()} successCallback On complete.
- * @param {function(FileOperationManager.Error)} errorCallback On error.
- * @override
- */
-FileOperationManager.ZipTask.prototype.run = function(
-    entryChangedCallback, progressCallback, successCallback, errorCallback) {
-  // TODO(hidehiko): we should localize the name.
-  var destName = 'Archive';
-  if (this.sourceEntries.length == 1) {
-    var entryPath = this.sourceEntries[0].fullPath;
-    var i = entryPath.lastIndexOf('/');
-    var basename = (i < 0) ? entryPath : entryPath.substr(i + 1);
-    i = basename.lastIndexOf('.');
-    destName = ((i < 0) ? basename : basename.substr(0, i));
-  }
-
-  fileOperationUtil.deduplicatePath(
-      this.targetDirEntry, destName + '.zip',
-      function(destPath) {
-        // TODO: per-entry zip progress update with accurate byte count.
-        // For now just set completedBytes to same value as totalBytes so
-        // that the progress bar is full.
-        this.processedBytes = this.totalBytes;
-        progressCallback();
-
-        // The number of elements in processingEntries is 1. See also
-        // initialize().
-        var entries = [];
-        for (var url in this.processingEntries[0])
-          entries.push(this.processingEntries[0][url]);
-
-        fileOperationUtil.zipSelection(
-            entries,
-            this.zipBaseDirEntry,
-            destPath,
-            function(entry) {
-              entryChangedCallback(util.EntryChangedKind.CREATE, entry);
-              successCallback();
-            },
-            function(error) {
-              errorCallback(new FileOperationManager.Error(
-                  util.FileOperationErrorType.FILESYSTEM_ERROR, error));
-            });
-      }.bind(this),
-      errorCallback);
-};
-
-/**
- * Error class used to report problems with a copy operation.
- * If the code is UNEXPECTED_SOURCE_FILE, data should be a path of the file.
- * If the code is TARGET_EXISTS, data should be the existing Entry.
- * If the code is FILESYSTEM_ERROR, data should be the FileError.
- *
- * @param {util.FileOperationErrorType} code Error type.
- * @param {string|Entry|FileError} data Additional data.
- * @constructor
- */
-FileOperationManager.Error = function(code, data) {
-  this.code = code;
-  this.data = data;
-};
-
-// FileOperationManager methods.
-
-/**
- * Called before a new method is run in the manager. Prepares the manager's
- * state for running a new method.
- */
-FileOperationManager.prototype.willRunNewMethod = function() {
-  // Cancel any pending close actions so the file copy manager doesn't go away.
-  if (this.unloadTimeout_)
-    clearTimeout(this.unloadTimeout_);
-  this.unloadTimeout_ = null;
-};
-
-/**
- * @return {Object} Status object.
- */
-FileOperationManager.prototype.getStatus = function() {
-  // TODO(hidehiko): Reorganize the structure when delete queue is merged
-  // into copy task queue.
-  var result = {
-    // Set to util.FileOperationType if all the running/pending tasks is
-    // the same kind of task.
-    operationType: null,
-
-    // The number of entries to be processed.
-    numRemainingItems: 0,
-
-    // The total number of bytes to be processed.
-    totalBytes: 0,
-
-    // The number of bytes.
-    processedBytes: 0,
-
-    // Available if numRemainingItems == 1. Pointing to an Entry which is
-    // begin processed.
-    processingEntry: task.getSingleEntry()
-  };
-
-  var operationType =
-      this.copyTasks_.length > 0 ? this.copyTasks_[0].operationType : null;
-  var task = null;
-  for (var i = 0; i < this.copyTasks_.length; i++) {
-    task = this.copyTasks_[i];
-    if (task.operationType != operationType)
-      operationType = null;
-
-    // Assuming the number of entries is small enough, count every time.
-    result.numRemainingItems += task.countRemainingItems();
-    result.totalBytes += task.totalBytes;
-    result.processedBytes += task.processedBytes;
-  }
-
-  result.operationType = operationType;
-  return result;
-};
-
-/**
- * Adds an event listener for the tasks.
- * @param {string} type The name of the event.
- * @param {function(Event)} handler The handler for the event.
- *     This is called when the event is dispatched.
- */
-FileOperationManager.prototype.addEventListener = function(type, handler) {
-  this.eventRouter_.addEventListener(type, handler);
-};
-
-/**
- * Removes an event listener for the tasks.
- * @param {string} type The name of the event.
- * @param {function(Event)} handler The handler to be removed.
- */
-FileOperationManager.prototype.removeEventListener = function(type, handler) {
-  this.eventRouter_.removeEventListener(type, handler);
-};
-
-/**
- * Says if there are any tasks in the queue.
- * @return {boolean} True, if there are any tasks.
- */
-FileOperationManager.prototype.hasQueuedTasks = function() {
-  return this.copyTasks_.length > 0 || this.deleteTasks_.length > 0;
-};
-
-/**
- * Unloads the host page in 5 secs of idling. Need to be called
- * each time this.copyTasks_.length or this.deleteTasks_.length
- * changed.
- *
- * @private
- */
-FileOperationManager.prototype.maybeScheduleCloseBackgroundPage_ = function() {
-  if (!this.hasQueuedTasks()) {
-    if (this.unloadTimeout_ === null)
-      this.unloadTimeout_ = setTimeout(maybeCloseBackgroundPage, 5000);
-  } else if (this.unloadTimeout_) {
-    clearTimeout(this.unloadTimeout_);
-    this.unloadTimeout_ = null;
-  }
-};
-
-/**
- * Completely clear out the copy queue, either because we encountered an error
- * or completed successfully.
- *
- * @private
- */
-FileOperationManager.prototype.resetQueue_ = function() {
-  for (var i = 0; i < this.cancelObservers_.length; i++)
-    this.cancelObservers_[i]();
-
-  this.copyTasks_ = [];
-  this.cancelObservers_ = [];
-  this.maybeScheduleCloseBackgroundPage_();
-};
-
-/**
- * Request that the current copy queue be abandoned.
- *
- * @param {function()=} opt_callback On cancel.
- */
-FileOperationManager.prototype.requestCancel = function(opt_callback) {
-  this.cancelRequested_ = true;
-  if (this.cancelCallback_) {
-    this.cancelCallback_();
-    this.cancelCallback_ = null;
-  }
-  if (opt_callback)
-    this.cancelObservers_.push(opt_callback);
-
-  // If there is any active task it will eventually call maybeCancel_.
-  // Otherwise call it right now.
-  if (this.copyTasks_.length == 0)
-    this.doCancel_();
-  else
-    this.copyTasks_[0].requestCancel();
-};
-
-/**
- * Requests the specified task to be canceled.
- * @param {string} taskId ID of task to be canceled.
- */
-FileOperationManager.prototype.requestTaskCancel = function(taskId) {
-  var task = null;
-  for (var i = 0; i < this.copyTasks_.length; i++) {
-    if (this.copyTasks_[i].taskId === taskId) {
-      this.copyTasks_[i].requestCancel();
-      return;
-    }
-  }
-  for (var i = 0; i < this.deleteTasks_.length; i++) {
-    if (this.deleteTasks_[i].taskId === taskId) {
-      this.deleteTasks_[i].requestCancel();
-      return;
-    }
-  }
-};
-
-/**
- * Perform the bookkeeping required to cancel.
- *
- * @private
- */
-FileOperationManager.prototype.doCancel_ = function() {
-  var taskId = this.copyTasks_[0].taskId;
-  this.resetQueue_();
-  this.cancelRequested_ = false;
-  this.eventRouter_.sendProgressEvent('CANCELLED', this.getStatus(), taskId);
-};
-
-/**
- * Used internally to check if a cancel has been requested, and handle
- * it if so.
- *
- * @return {boolean} If canceled.
- * @private
- */
-FileOperationManager.prototype.maybeCancel_ = function() {
-  if (!this.cancelRequested_)
-    return false;
-
-  this.doCancel_();
-  return true;
-};
-
-/**
- * Kick off pasting.
- *
- * @param {Array.<string>} sourcePaths Path of the source files.
- * @param {string} targetPath The destination path of the target directory.
- * @param {boolean} isMove True if the operation is "move", otherwise (i.e.
- *     if the operation is "copy") false.
- */
-FileOperationManager.prototype.paste = function(
-    sourcePaths, targetPath, isMove) {
-  // Do nothing if sourcePaths is empty.
-  if (sourcePaths.length == 0)
-    return;
-
-  var errorCallback = function(error) {
-    this.eventRouter_.sendProgressEvent(
-        'ERROR',
-        this.getStatus(),
-        this.generateTaskId_(null),
-        new FileOperationManager.Error(
-            util.FileOperationErrorType.FILESYSTEM_ERROR, error));
-  }.bind(this);
-
-  var targetEntry = null;
-  var entries = [];
-
-  // Resolve paths to entries.
-  var resolveGroup = new AsyncUtil.Group();
-  resolveGroup.add(function(callback) {
-    webkitResolveLocalFileSystemURL(
-        util.makeFilesystemUrl(targetPath),
-        function(entry) {
-          if (!entry.isDirectory) {
-            // Found a non directory entry.
-            errorCallback(util.createFileError(FileError.TYPE_MISMATCH_ERR));
-            return;
-          }
-
-          targetEntry = entry;
-          callback();
-        },
-        errorCallback);
-  });
-
-  for (var i = 0; i < sourcePaths.length; i++) {
-    resolveGroup.add(function(sourcePath, callback) {
-      webkitResolveLocalFileSystemURL(
-          util.makeFilesystemUrl(sourcePath),
-          function(entry) {
-            entries.push(entry);
-            callback();
-          },
-          errorCallback);
-    }.bind(this, sourcePaths[i]));
-  }
-
-  resolveGroup.run(function() {
-    if (isMove) {
-      // Moving to the same directory is a redundant operation.
-      entries = entries.filter(function(entry) {
-        return targetEntry.fullPath + '/' + entry.name != entry.fullPath;
-      });
-
-      // Do nothing, if we have no entries to be moved.
-      if (entries.length == 0)
-        return;
-    }
-
-    this.queueCopy_(targetEntry, entries, isMove);
-  }.bind(this));
-};
-
-/**
- * Checks if the move operation is available between the given two locations.
- *
- * @param {DirectoryEntry} sourceEntry An entry from the source.
- * @param {DirectoryEntry} targetDirEntry Directory entry for the target.
- * @return {boolean} Whether we can move from the source to the target.
- */
-FileOperationManager.prototype.isMovable = function(sourceEntry,
-                                               targetDirEntry) {
-  return (PathUtil.isDriveBasedPath(sourceEntry.fullPath) &&
-          PathUtil.isDriveBasedPath(targetDirEntry.fullPath)) ||
-         (PathUtil.getRootPath(sourceEntry.fullPath) ==
-          PathUtil.getRootPath(targetDirEntry.fullPath));
-};
-
-/**
- * Initiate a file copy.
- *
- * @param {DirectoryEntry} targetDirEntry Target directory.
- * @param {Array.<Entry>} entries Entries to copy.
- * @param {boolean} isMove In case of move.
- * @return {FileOperationManager.Task} Copy task.
- * @private
- */
-FileOperationManager.prototype.queueCopy_ = function(
-    targetDirEntry, entries, isMove) {
-  // When copying files, null can be specified as source directory.
-  var task;
-  if (isMove) {
-    if (this.isMovable(entries[0], targetDirEntry)) {
-      task = new FileOperationManager.MoveTask(entries, targetDirEntry);
-    } else {
-      task = new FileOperationManager.CopyTask(entries, targetDirEntry);
-      task.deleteAfterCopy = true;
-    }
-  } else {
-    task = new FileOperationManager.CopyTask(entries, targetDirEntry);
-  }
-
-  task.taskId = this.generateTaskId_();
-  task.initialize(function() {
-    this.copyTasks_.push(task);
-    this.maybeScheduleCloseBackgroundPage_();
-    this.eventRouter_.sendProgressEvent('BEGIN', task.getStatus(), task.taskId);
-    if (this.copyTasks_.length == 1) {
-      // Assume this.cancelRequested_ == false.
-      // This moved us from 0 to 1 active tasks, let the servicing begin!
-      this.serviceAllTasks_();
-    }
-  }.bind(this));
-
-  return task;
-};
-
-/**
- * Service all pending tasks, as well as any that might appear during the
- * copy.
- *
- * @private
- */
-FileOperationManager.prototype.serviceAllTasks_ = function() {
-  if (!this.copyTasks_.length) {
-    // All tasks have been serviced, clean up and exit.
-    this.resetQueue_();
-    return;
-  }
-
-  var onTaskProgress = function() {
-    this.eventRouter_.sendProgressEvent('PROGRESS',
-                                        this.copyTasks_[0].getStatus(),
-                                        this.copyTasks_[0].taskId);
-  }.bind(this);
-
-  var onEntryChanged = function(kind, entry) {
-    this.eventRouter_.sendEntryChangedEvent(kind, entry);
-  }.bind(this);
-
-  var onTaskError = function(err) {
-    var task = this.copyTasks_.shift();
-    if (this.maybeCancel_())
-      return;
-    this.eventRouter_.sendProgressEvent('ERROR',
-                                        task.getStatus(),
-                                        task.taskId,
-                                        err);
-    this.serviceAllTasks_();
-  }.bind(this);
-
-  var onTaskSuccess = function() {
-    if (this.maybeCancel_())
-      return;
-
-    // The task at the front of the queue is completed. Pop it from the queue.
-    var task = this.copyTasks_.shift();
-    this.maybeScheduleCloseBackgroundPage_();
-    this.eventRouter_.sendProgressEvent('SUCCESS',
-                                        task.getStatus(),
-                                        task.taskId);
-    this.serviceAllTasks_();
-  }.bind(this);
-
-  var nextTask = this.copyTasks_[0];
-  this.eventRouter_.sendProgressEvent('PROGRESS',
-                                      nextTask.getStatus(),
-                                      nextTask.taskId);
-  nextTask.run(onEntryChanged, onTaskProgress, onTaskSuccess, onTaskError);
-};
-
-/**
- * Timeout before files are really deleted (to allow undo).
- */
-FileOperationManager.DELETE_TIMEOUT = 30 * 1000;
-
-/**
- * Schedules the files deletion.
- *
- * @param {Array.<Entry>} entries The entries.
- */
-FileOperationManager.prototype.deleteEntries = function(entries) {
-  var task = {
-    entries: entries,
-    taskId: this.generateTaskId_()
-  };
-  this.deleteTasks_.push(task);
-  this.eventRouter_.sendDeleteEvent('BEGIN', entries.map(function(entry) {
-    return util.makeFilesystemUrl(entry.fullPath);
-  }), task.taskId);
-  this.maybeScheduleCloseBackgroundPage_();
-  if (this.deleteTasks_.length == 1)
-    this.serviceAllDeleteTasks_();
-};
-
-/**
- * Service all pending delete tasks, as well as any that might appear during the
- * deletion.
- *
- * Must not be called if there is an in-flight delete task.
- *
- * @private
- */
-FileOperationManager.prototype.serviceAllDeleteTasks_ = function() {
-  // Returns the urls of the given task's entries.
-  var getTaskUrls = function(task) {
-    return task.entries.map(function(entry) {
-      return util.makeFilesystemUrl(entry.fullPath);
-    });
-  };
-
-  var onTaskSuccess = function() {
-    var urls = getTaskUrls(this.deleteTasks_[0]);
-    var taskId = this.deleteTasks_[0].taskId;
-    this.deleteTasks_.shift();
-    this.eventRouter_.sendDeleteEvent('SUCCESS', urls, taskId);
-
-    if (!this.deleteTasks_.length) {
-      // All tasks have been serviced, clean up and exit.
-      this.maybeScheduleCloseBackgroundPage_();
-      return;
-    }
-
-    var nextTask = this.deleteTasks_[0];
-    this.eventRouter_.sendDeleteEvent('PROGRESS',
-                                      urls,
-                                      nextTask.taskId);
-    this.serviceDeleteTask_(nextTask, onTaskSuccess, onTaskFailure);
-  }.bind(this);
-
-  var onTaskFailure = function(error) {
-    var urls = getTaskUrls(this.deleteTasks_[0]);
-    var taskId = this.deleteTasks_[0].taskId;
-    this.deleteTasks_ = [];
-    this.eventRouter_.sendDeleteEvent('ERROR',
-                                      urls,
-                                      taskId);
-    this.maybeScheduleCloseBackgroundPage_();
-  }.bind(this);
-
-  this.serviceDeleteTask_(this.deleteTasks_[0], onTaskSuccess, onTaskFailure);
-};
-
-/**
- * Performs the deletion.
- *
- * @param {Object} task The delete task (see deleteEntries function).
- * @param {function()} successCallback Callback run on success.
- * @param {function(FileOperationManager.Error)} errorCallback Callback run on
- *     error.
- * @private
- */
-FileOperationManager.prototype.serviceDeleteTask_ = function(
-    task, successCallback, errorCallback) {
-  var downcount = task.entries.length;
-  if (downcount == 0) {
-    successCallback();
-    return;
-  }
-
-  var filesystemError = null;
-  var onComplete = function() {
-    if (--downcount > 0)
-      return;
-
-    // All remove operations are processed. Run callback.
-    if (filesystemError) {
-      errorCallback(new FileOperationManager.Error(
-          util.FileOperationErrorType.FILESYSTEM_ERROR, filesystemError));
-    } else {
-      successCallback();
-    }
-  };
-
-  for (var i = 0; i < task.entries.length; i++) {
-    var entry = task.entries[i];
-    util.removeFileOrDirectory(
-        entry,
-        function(currentEntry) {
-          this.eventRouter_.sendEntryChangedEvent(
-              util.EntryChangedKind.DELETED, currentEntry);
-          onComplete();
-        }.bind(this, entry),
-        function(error) {
-          if (!filesystemError)
-            filesystemError = error;
-          onComplete();
-        });
-  }
-};
-
-/**
- * Creates a zip file for the selection of files.
- *
- * @param {Entry} dirEntry The directory containing the selection.
- * @param {Array.<Entry>} selectionEntries The selected entries.
- */
-FileOperationManager.prototype.zipSelection = function(
-    dirEntry, selectionEntries) {
-  var zipTask = new FileOperationManager.ZipTask(
-      selectionEntries, dirEntry, dirEntry);
-  zipTask.taskId = this.generateTaskId_(this.copyTasks_);
-  zipTask.zip = true;
-  zipTask.initialize(function() {
-    this.copyTasks_.push(zipTask);
-    this.eventRouter_.sendProgressEvent('BEGIN',
-                                        zipTask.getStatus(),
-                                        zipTask.taskId);
-    if (this.copyTasks_.length == 1) {
-      // Assume this.cancelRequested_ == false.
-      // This moved us from 0 to 1 active tasks, let the servicing begin!
-      this.serviceAllTasks_();
-    }
-  }.bind(this));
-};
-
-/**
- * Generates new task ID.
- *
- * @return {string} New task ID.
- * @private
- */
-FileOperationManager.prototype.generateTaskId_ = function() {
-  return 'file-operation-' + this.taskIdCounter_++;
-};