text: /*
   * Copyright (C) 2013 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 Stream_h
  #define Stream_h
  
  #include "bindings/core/v8/ScriptWrappable.h"
  #include "core/CoreExport.h"
  #include "core/dom/ActiveDOMObject.h"
  #include "platform/heap/Handle.h"
  #include "platform/weborigin/KURL.h"
  #include "wtf/text/WTFString.h"
  
  namespace blink {
  
  class ExecutionContext;
  
  class CORE_EXPORT Stream final : public GarbageCollectedFinalized<Stream>,
                                   public ScriptWrappable,
                                   public ActiveDOMObject {
    USING_GARBAGE_COLLECTED_MIXIN(Stream);
    DEFINE_WRAPPERTYPEINFO();
  
   public:
    static Stream* create(ExecutionContext* context, const String& mediaType) {
      Stream* stream = new Stream(context, mediaType);
      stream->suspendIfNeeded();
      return stream;
    }
  
    ~Stream() override;
  
    // Returns the internal URL referring to this stream.
    const KURL& url() const { return m_internalURL; }
    // Returns the media type of this stream.
    const String& type() const { return m_mediaType; }
  
    // Appends data to this stream.
    void addData(const char* data, size_t len);
    // Flushes contents buffered in the stream.
    void flush();
    // Mark this stream finalized so that a reader of this stream is notified
    // of EOF.
    void finalize();
    // Mark this stream finalized due to an error so that a reader of this
    // stream is notified of EOF due to the error.
    void abort();
  
    // Allow an external reader class to mark this object neutered so that they
    // won't load the corresponding stream again. All stream objects are
    // read-once for now.
    void neuter() { m_isNeutered = true; }
    bool isNeutered() const { return m_isNeutered; }
  
    // Implementation of ActiveDOMObject.
    //
    // FIXME: Implement suspend() and resume() when necessary.
    void suspend() override;
    void resume() override;
    void contextDestroyed() override;
  
    DECLARE_VIRTUAL_TRACE();
  
   protected:
    Stream(ExecutionContext*, const String& mediaType);
  
    // This is an internal URL referring to the blob data associated with this
    // object. It serves as an identifier for this blob. The internal URL is never
    // used to source the blob's content into an HTML or for FileRead'ing, public
    // blob URLs must be used for those purposes.
    KURL m_internalURL;
  
    String m_mediaType;
  
    bool m_isNeutered;
  };
  
  }  // namespace blink
  
  #endif  // Stream_h
  