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// Copyright 2018 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.
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_STREAMS_TRANSFORM_STREAM_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_STREAMS_TRANSFORM_STREAM_H_
#include "base/macros.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/platform/bindings/trace_wrapper_v8_reference.h"
#include "third_party/blink/renderer/platform/heap/garbage_collected.h"
#include "third_party/blink/renderer/platform/heap/heap.h"
#include "v8/include/v8.h"
namespace blink {
class ExceptionState;
class ScriptState;
class ScriptValue;
class TransformStreamTransformer;
class Visitor;
// Creates and wraps a JavaScript TransformStream object with a transformation
// defined in C++. Provides access to the readable and writable streams.
//
// On-heap references to this class must always be via a TraceWrapperMember, and
// must always have an ancestor in the V8 heap, or |stream_| will be lost.
//
// To ensure that the JS TransformStream is always referenced, this class uses
// two-stage construction. After calling the constructor, store the reference
// in a TraceWrapperMember before calling Init(). Init() must always be called
// before using the instance.
class CORE_EXPORT TransformStream final
: public GarbageCollectedFinalized<TransformStream> {
public:
TransformStream();
~TransformStream();
// If HadException is true on return, the object is invalid and should be
// destroyed.
void Init(TransformStreamTransformer*, ScriptState*, ExceptionState&);
ScriptValue Readable(ScriptState*, ExceptionState&) const;
ScriptValue Writable(ScriptState*, ExceptionState&) const;
void Trace(Visitor*);
private:
// These are class-scoped to avoid name clashes in jumbo builds.
class Algorithm;
class FlushAlgorithm;
class TransformAlgorithm;
// Common implementation for Readable() and Writable() accessors.
ScriptValue Accessor(const char* accessor_function_name,
ScriptState*,
ExceptionState&) const;
TraceWrapperV8Reference<v8::Value> stream_;
DISALLOW_COPY_AND_ASSIGN(TransformStream);
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_STREAMS_TRANSFORM_STREAM_H_
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