Move the exception logic to the AudioNode creator

third_party/WebKit/Source/modules/webaudio/AudioBufferSourceNode.cpp

 /*
  * Copyright (C) 2010, 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:
  * 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
@@ skipping 563 matching lines @@
         if (context()->currentTime() > stopTime) {
             // The context time has passed the time when the source nodes should have stopped
             // playing. Stop the node now and deref it. (But don't run the onEnded event because the
             // source never actually played.)
             finishWithoutOnEnded();
         }
     }
 }
 
 // ----------------------------------------------------------------
-AudioBufferSourceNode::AudioBufferSourceNode(AbstractAudioContext& context, float sampleRate)
+AudioBufferSourceNode::AudioBufferSourceNode(AbstractAudioContext& context)
     : AudioScheduledSourceNode(context)
     , m_playbackRate(AudioParam::create(context, ParamTypeAudioBufferSourcePlaybackRate, 1.0))
     , m_detune(AudioParam::create(context, ParamTypeAudioBufferSourceDetune, 0.0))
 {
-    setHandler(AudioBufferSourceHandler::create(*this, sampleRate, m_playbackRate->handler(), m_detune->handler()));
+    setHandler(AudioBufferSourceHandler::create(
+        *this,
+        context.sampleRate(),
+        m_playbackRate->handler(),
+        m_detune->handler()));
 }
 
-AudioBufferSourceNode* AudioBufferSourceNode::create(AbstractAudioContext& context, float sampleRate)
+AudioBufferSourceNode* AudioBufferSourceNode::create(AbstractAudioContext& context, ExceptionState& exceptionState)
 {
-    return new AudioBufferSourceNode(context, sampleRate);
+    DCHECK(isMainThread());
+
+    if (context.isContextClosed()) {
+        context.throwExceptionForClosedState(exceptionState);
+        return nullptr;
+    }
+
+    return new AudioBufferSourceNode(context);
 }
 
 DEFINE_TRACE(AudioBufferSourceNode)
 {
     visitor->trace(m_playbackRate);
     visitor->trace(m_detune);
     AudioScheduledSourceNode::trace(visitor);
 }
 
 AudioBufferSourceHandler& AudioBufferSourceNode::audioBufferSourceHandler() const
@@ skipping 65 matching lines @@
 {
     audioBufferSourceHandler().start(when, grainOffset, exceptionState);
 }
 
 void AudioBufferSourceNode::start(double when, double grainOffset, double grainDuration, ExceptionState& exceptionState)
 {
     audioBufferSourceHandler().start(when, grainOffset, grainDuration, exceptionState);
 }
 
 } // namespace blink