[File Manager] Cleanup: Moving js/css/html files to dedicated directories

chrome/browser/resources/file_manager/js/metadata_provider.js

-// Copyright (c) 2011 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.
-
-/**
- * @param {string} opt_workerPath path to the worker source JS file.
- */
-function MetadataProvider(opt_workerPath) {
-  this.cache_ = {};
-
-  // Pass all URLs to the metadata reader until we have a correct filter.
-  this.urlFilter = /.*/;
-
-  if (!opt_workerPath) {
-    var path = document.location.pathname;
-    opt_workerPath = document.location.origin +
-        path.substring(0, path.lastIndexOf('/') + 1) +
-        'js/metadata_dispatcher.js';
-  }
-
-  this.dispatcher_ = new Worker(opt_workerPath);
-  this.dispatcher_.onmessage = this.onMessage_.bind(this);
-  this.dispatcher_.postMessage({verb: 'init'});
-  // Initialization is not complete until the Worker sends back the
-  // 'initialized' message.  See below.
-}
-
-MetadataProvider.prototype.fetch = function(url, callback) {
-  var cacheValue = this.cache_[url];
-
-  if (!cacheValue) {
-    // This is the first time anyone's asked, go get it.
-    if (url.match(this.urlFilter)) {
-      this.cache_[url] = [callback];
-      this.dispatcher_.postMessage({verb: 'request', arguments: [url]});
-      return;
-    }
-    // Cannot extract metadata for this file, return an empty map.
-    setTimeout(function() { callback({}) }, 0);
-    return;
-  }
-
-  if (cacheValue instanceof Array) {
-    // Something is already pending, add to the list of observers.
-    cacheValue.push(callback);
-    return;
-  }
-
-  if (cacheValue instanceof Object) {
-    // We already know the answer, let the caller know in a fresh call stack.
-    setTimeout(function() { callback(cacheValue) }, 0);
-    return;
-  }
-
-  console.error('Unexpected metadata cache value:' + cacheValue);
-};
-
-MetadataProvider.prototype.reset = function(url) {
-  if (this.cache_[url] instanceof Array) {
-    console.error(
-        'Abandoned ' + this.cache_[url].length + ' metadata subscribers',
-        url);
-  }
-  delete this.cache_[url];
-};
-
-
-/**
- * Dispatch a message from a metadata reader to the appropriate on* method.
- */
-MetadataProvider.prototype.onMessage_ = function(event) {
-  var data = event.data;
-
-  var methodName =
-      'on' + data.verb.substr(0, 1).toUpperCase() + data.verb.substr(1) + '_';
-
-  if (!(methodName in this)) {
-    console.log('Unknown message from metadata reader: ' + data.verb, data);
-    return;
-  }
-
-  this[methodName].apply(this, data.arguments);
-};
-
-/**
- * Handles the 'initialized' message from the metadata reader Worker.
- */
-MetadataProvider.prototype.onInitialized_ = function(regexp) {
-  this.urlFilter = regexp;
-};
-
-MetadataProvider.prototype.onResult_ = function(url, metadata) {
-  var observers = this.cache_[url];
-  if (!observers || !(observers instanceof Array)) {
-    console.error('Missing or invalid metadata observers: ' + url + ': ' +
-                  observers);
-    return;
-  }
-
-  console.log('metadata result:', metadata);
-  for (var i = 0; i < observers.length; i++) {
-    observers[i](metadata);
-  }
-
-  this.cache_[url] = metadata;
-};
-
-MetadataProvider.prototype.onError_ = function(url, step, error, metadata) {
-  console.warn('metadata: ' + url + ': ' + step + ': ' + error);
-  this.onResult_(url, metadata || {});
-};
-
-MetadataProvider.prototype.onLog_ = function(arglist) {
-  console.log.apply(console, ['metadata:'].concat(arglist));
-};