<!DOCTYPE html>
<!--
Copyright (c) 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.
-->
<link rel="import" href="/base/base.html">
<link rel="import" href="/base/extension_registry.html">
<script>
'use strict';

/**
 * @fileoverview Base class for trace data importers.
 */
tv.exportTo('tv.c.importer', function() {
  function Importer() { }

  Importer.prototype = {
    __proto__: Object.prototype,

    /**
     * Called by the Model to check whether the importer type stores the actual
     * trace data or just holds it as container for further extraction.
     */
    isTraceDataContainer: function() {
      return false;
    },

    /**
     * Called by the Model to extract one or more subtraces from the event data.
     */
    extractSubtraces: function() {
      return [];
    },

    /**
     * Called to import events into the Model.
     */
    importEvents: function() {
    },

    /**
     * Called to import sample data into the Model.
     */
    importSampleData: function() {
    },

    /**
     * Called by the Model after all other importers have imported their
     * events.
     */
    finalizeImport: function() {
    },

    /**
     * Called by the Model to join references between objects, after final
     * model bounds have been computed.
     */
    joinRefs: function() {
    }
  };


  var options = new tv.b.ExtensionRegistryOptions(tv.b.BASIC_REGISTRY_MODE);
  options.defaultMetadata = {};
  options.mandatoryBaseClass = Importer;
  tv.b.decorateExtensionRegistry(Importer, options);

  Importer.findImporterFor = function(eventData) {
    var typeInfo = Importer.findTypeInfoMatching(function(ti) {
      return ti.constructor.canImport(eventData);
    });
    if (typeInfo)
      return typeInfo.constructor;
    return undefined;
  };

  return {
    Importer: Importer
  };
});
</script>