text: /*
   * Copyright (C) 2017 Apple Inc. All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
   * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   * THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #include "config.h"
  #include "FileSystemDirectoryReader.h"
  
  #include "DOMException.h"
  #include "DOMFileSystem.h"
  #include "ErrorCallback.h"
  #include "FileSystemDirectoryEntry.h"
  #include "FileSystemEntriesCallback.h"
  #include "ScriptExecutionContext.h"
  #include <wtf/MainThread.h>
  
  namespace WebCore {
  
  FileSystemDirectoryReader::FileSystemDirectoryReader(ScriptExecutionContext& context, FileSystemDirectoryEntry& directory)
      : ActiveDOMObject(&context)
      , m_directory(directory)
  {
      suspendIfNeeded();
  }
  
  FileSystemDirectoryReader::~FileSystemDirectoryReader() = default;
  
  const char* FileSystemDirectoryReader::activeDOMObjectName() const
  {
      return "FileSystemDirectoryReader";
  }
  
  bool FileSystemDirectoryReader::canSuspendForDocumentSuspension() const
  {
      return !hasPendingActivity();
  }
  
  // https://wicg.github.io/entries-api/#dom-filesystemdirectoryentry-readentries
  void FileSystemDirectoryReader::readEntries(ScriptExecutionContext& context, Ref<FileSystemEntriesCallback>&& successCallback, RefPtr<ErrorCallback>&& errorCallback)
  {
      if (m_isReading) {
          if (errorCallback)
              errorCallback->scheduleCallback(context, DOMException::create(Exception { InvalidStateError, ASCIILiteral("Directory reader is already reading") }));
          return;
      }
  
      if (m_error) {
          if (errorCallback)
              errorCallback->scheduleCallback(context, DOMException::create(*m_error));
          return;
      }
  
      if (m_isDone) {
          successCallback->scheduleCallback(context, { });
          return;
      }
  
      m_isReading = true;
      auto pendingActivity = makePendingActivity(*this);
      callOnMainThread([this, context = makeRef(context), successCallback = WTFMove(successCallback), errorCallback = WTFMove(errorCallback), pendingActivity = WTFMove(pendingActivity)]() mutable {
          m_isReading = false;
          m_directory->filesystem().listDirectory(context, m_directory, [this, successCallback = WTFMove(successCallback), errorCallback = WTFMove(errorCallback), pendingActivity = WTFMove(pendingActivity)](ExceptionOr<Vector<Ref<FileSystemEntry>>>&& result) {
              if (result.hasException()) {
                  m_error = result.releaseException();
                  if (errorCallback)
                      errorCallback->handleEvent(DOMException::create(*m_error));
                  return;
              }
              m_isDone = true;
              successCallback->handleEvent(result.releaseReturnValue());
          });
      });
  }
  
  } // namespace WebCore
  