Move the exception logic to the AudioNode creator

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

Index: third_party/WebKit/Source/modules/webaudio/IIRFilterNode.cpp
diff --git a/third_party/WebKit/Source/modules/webaudio/IIRFilterNode.cpp b/third_party/WebKit/Source/modules/webaudio/IIRFilterNode.cpp
index 401e199f33e63739b32b39c644269c57ca624921..bde304df7f59c90589c682379dea197ab348585f 100644
--- a/third_party/WebKit/Source/modules/webaudio/IIRFilterNode.cpp
+++ b/third_party/WebKit/Source/modules/webaudio/IIRFilterNode.cpp
@@ -7,17 +7,18 @@
 #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/AudioBasicProcessorHandler.h"
 #include "platform/Histogram.h"
 
 namespace blink {
 
-IIRFilterNode::IIRFilterNode(AbstractAudioContext& context, float sampleRate, const Vector<double> feedforwardCoef, const Vector<double> feedbackCoef)
+IIRFilterNode::IIRFilterNode(AbstractAudioContext& context, const Vector<double> feedforwardCoef, const Vector<double> feedbackCoef)
     : AudioNode(context)
 {
     setHandler(AudioBasicProcessorHandler::create(
-        AudioHandler::NodeTypeIIRFilter, *this, sampleRate,
-        adoptPtr(new IIRProcessor(sampleRate, 1, feedforwardCoef, feedbackCoef))));
+        AudioHandler::NodeTypeIIRFilter, *this, context.sampleRate(),
+        adoptPtr(new IIRProcessor(context.sampleRate(), 1, feedforwardCoef, feedbackCoef))));
 
     // Histogram of the IIRFilter order.  createIIRFilter ensures that the length of |feedbackCoef|
     // is in the range [1, IIRFilter::kMaxOrder + 1].  The order is one less than the length of this
@@ -27,6 +28,94 @@ IIRFilterNode::IIRFilterNode(AbstractAudioContext& context, float sampleRate, co
     filterOrderHistogram.sample(feedbackCoef.size() - 1);
 }
 
+IIRFilterNode* IIRFilterNode::create(
+    AbstractAudioContext& context,
+    const Vector<double> feedforwardCoef,
+    const Vector<double> feedbackCoef,
+    ExceptionState& exceptionState)
+{
+    DCHECK(isMainThread());
+
+    if (context.isContextClosed()) {
+        context.throwExceptionForClosedState(exceptionState);
+        return nullptr;
+    }
+
+    if (feedbackCoef.size() == 0 || (feedbackCoef.size() > IIRFilter::kMaxOrder + 1)) {
+        exceptionState.throwDOMException(
+            NotSupportedError,
+            ExceptionMessages::indexOutsideRange<size_t>(
+                "number of feedback coefficients",
+                feedbackCoef.size(),
+                1,
+                ExceptionMessages::InclusiveBound,
+                IIRFilter::kMaxOrder + 1,
+                ExceptionMessages::InclusiveBound));
+        return nullptr;
+    }
+
+    if (feedforwardCoef.size() == 0 || (feedforwardCoef.size() > IIRFilter::kMaxOrder + 1)) {
+        exceptionState.throwDOMException(
+            NotSupportedError,
+            ExceptionMessages::indexOutsideRange<size_t>(
+                "number of feedforward coefficients",
+                feedforwardCoef.size(),
+                1,
+                ExceptionMessages::InclusiveBound,
+                IIRFilter::kMaxOrder + 1,
+                ExceptionMessages::InclusiveBound));
+        return nullptr;
+    }
+
+    if (feedbackCoef[0] == 0) {
+        exceptionState.throwDOMException(
+            InvalidStateError,
+            "First feedback coefficient cannot be zero.");
+        return nullptr;
+    }
+
+    bool hasNonZeroCoef = false;
+
+    for (size_t k = 0; k < feedforwardCoef.size(); ++k) {
+        if (feedforwardCoef[k] != 0) {
+            hasNonZeroCoef = true;
+            break;
+        }
+    }
+
+    if (!hasNonZeroCoef) {
+        exceptionState.throwDOMException(
+            InvalidStateError,
+            "At least one feedforward coefficient must be non-zero.");
+        return nullptr;
+    }
+
+    // Make sure all coefficents are finite.
+    for (size_t k = 0; k < feedforwardCoef.size(); ++k) {
+        double c = feedforwardCoef[k];
+        if (!std::isfinite(c)) {
+            String name = "feedforward coefficient " + String::number(k);
+            exceptionState.throwDOMException(
+                InvalidStateError,
+                ExceptionMessages::notAFiniteNumber(c, name.ascii().data()));
+            return nullptr;
+        }
+    }
+
+    for (size_t k = 0; k < feedbackCoef.size(); ++k) {
+        double c = feedbackCoef[k];
+        if (!std::isfinite(c)) {
+            String name = "feedback coefficient " + String::number(k);
+            exceptionState.throwDOMException(
+                InvalidStateError,
+                ExceptionMessages::notAFiniteNumber(c, name.ascii().data()));
+            return nullptr;
+        }
+    }
+
+    return new IIRFilterNode(context, feedforwardCoef, feedbackCoef);
+}
+
 DEFINE_TRACE(IIRFilterNode)
 {
     AudioNode::trace(visitor);