Move the exception logic to the AudioNode creator

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

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
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  *     its contributors may be used to endorse or promote products derived
  *     from this software without specific prior written permission.
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 #include "modules/webaudio/PeriodicWave.h"
+#include "bindings/core/v8/ExceptionMessages.h"
+#include "bindings/core/v8/ExceptionState.h"
+#include "core/dom/ExceptionCode.h"
+#include "modules/webaudio/AbstractAudioContext.h"
 #include "modules/webaudio/OscillatorNode.h"
 #include "platform/audio/FFTFrame.h"
 #include "platform/audio/VectorMath.h"
 #include <algorithm>
 
 namespace blink {
 
 // The number of bands per octave.  Each octave will have this many entries in the wave tables.
 const unsigned kNumberOfOctaveBands = 3;
 
 // The max length of a periodic wave. This must be a power of two greater than or equal to 2048 and
 // must be supported by the FFT routines.
 const unsigned kMaxPeriodicWaveSize = 16384;
 
 const float CentsPerRange = 1200 / kNumberOfOctaveBands;
 
 using namespace VectorMath;
 
-PeriodicWave* PeriodicWave::create(float sampleRate, DOMFloat32Array* real, DOMFloat32Array* imag, bool disableNormalization)
+PeriodicWave* PeriodicWave::create(
+    AbstractAudioContext& context,
+    DOMFloat32Array* real,
+    DOMFloat32Array* imag,
+    bool disableNormalization,
+    ExceptionState& exceptionState)
 {
-    bool isGood = real && imag && real->length() == imag->length();
-    ASSERT(isGood);
-    if (isGood) {
-        PeriodicWave* periodicWave = new PeriodicWave(sampleRate);
-        size_t numberOfComponents = real->length();
-        periodicWave->createBandLimitedTables(real->data(), imag->data(), numberOfComponents, disableNormalization);
-        return periodicWave;
+    DCHECK(isMainThread());
+
+    if (context.isContextClosed()) {
+        context.throwExceptionForClosedState(exceptionState);
+        return nullptr;
     }
-    return nullptr;
+
+    if (real->length() != imag->length()) {
+        exceptionState.throwDOMException(
+            IndexSizeError,
+            "length of real array (" + String::number(real->length())
+            + ") and length of imaginary array (" +  String::number(imag->length())
+            + ") must match.");
+        return nullptr;
+    }
+
+    PeriodicWave* periodicWave = new PeriodicWave(context.sampleRate());
+    size_t numberOfComponents = real->length();
+    periodicWave->createBandLimitedTables(real->data(), imag->data(), numberOfComponents, disableNormalization);
+    return periodicWave;
 }
 
 PeriodicWave* PeriodicWave::createSine(float sampleRate)
 {
     PeriodicWave* periodicWave = new PeriodicWave(sampleRate);
     periodicWave->generateBasicWaveform(OscillatorHandler::SINE);
     return periodicWave;
 }
 
 PeriodicWave* PeriodicWave::createSquare(float sampleRate)
@@ skipping 253 matching lines @@
 
         realP[n] = 0;
         imagP[n] = b;
     }
 
     createBandLimitedTables(realP, imagP, halfSize, false);
 }
 
 } // namespace blink