/*
 * Copyright (C) 2011 Google 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:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * 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.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
 * OWNER OR 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.
 */

#ifndef DataObjectItem_h
#define DataObjectItem_h

#include "core/CoreExport.h"
#include "core/fileapi/File.h"
#include "platform/SharedBuffer.h"
#include "platform/heap/Handle.h"
#include "platform/weborigin/KURL.h"
#include "wtf/Forward.h"

namespace blink {

class Blob;

class CORE_EXPORT DataObjectItem
    : public GarbageCollectedFinalized<DataObjectItem> {
 public:
  enum ItemKind { StringKind, FileKind };

  static DataObjectItem* createFromString(const String& type,
                                          const String& data);
  static DataObjectItem* createFromFile(File*);
  // File with non-empty filesystem ID can be converted into FileEntry by using
  // webkitGetAsEntry.
  static DataObjectItem* createFromFileWithFileSystemId(
      File*,
      const String& fileSystemId);
  static DataObjectItem* createFromURL(const String& url, const String& title);
  static DataObjectItem* createFromHTML(const String& html,
                                        const KURL& baseURL);
  static DataObjectItem* createFromSharedBuffer(const String& filename,
                                                PassRefPtr<SharedBuffer>);
  static DataObjectItem* createFromPasteboard(const String& type,
                                              uint64_t sequenceNumber);

  ItemKind kind() const { return m_kind; }
  String type() const { return m_type; }
  String getAsString() const;
  Blob* getAsFile() const;

  // Used to support legacy DataTransfer APIs and renderer->browser
  // serialization.
  PassRefPtr<SharedBuffer> sharedBuffer() const { return m_sharedBuffer; }
  String title() const { return m_title; }
  KURL baseURL() const { return m_baseURL; }
  bool isFilename() const;

  bool hasFileSystemId() const;
  String fileSystemId() const;

  DECLARE_TRACE();

 private:
  enum DataSource {
    PasteboardSource,
    InternalSource,
  };

  DataObjectItem(ItemKind, const String& type);
  DataObjectItem(ItemKind, const String& type, uint64_t sequenceNumber);

  DataSource m_source;
  ItemKind m_kind;
  String m_type;

  String m_data;
  Member<File> m_file;
  RefPtr<SharedBuffer> m_sharedBuffer;
  // Optional metadata. Currently used for URL, HTML, and dragging files in.
  String m_title;
  KURL m_baseURL;

  uint64_t m_sequenceNumber;  // Only valid when m_source == PasteboardSource
  String m_fileSystemId;      // Only valid when m_file is backed by FileEntry.
};

}  // namespace blink

#endif  // DataObjectItem_h
