Introduce MIDIInputMap and MIDIOutputMap.

Source/modules/webmidi/MIDIAccess.cpp

Index: Source/modules/webmidi/MIDIAccess.cpp
diff --git a/Source/modules/webmidi/MIDIAccess.cpp b/Source/modules/webmidi/MIDIAccess.cpp
index d0a733c1b36de4dade5bba329e1ed5ec20b4167d..c62fe17e4effe9eed2db7e087a7fc0a5ab953e2f 100644
--- a/Source/modules/webmidi/MIDIAccess.cpp
+++ b/Source/modules/webmidi/MIDIAccess.cpp
@@ -37,7 +37,11 @@
 #include "modules/webmidi/MIDIAccessInitializer.h"
 #include "modules/webmidi/MIDIConnectionEvent.h"
 #include "modules/webmidi/MIDIController.h"
+#include "modules/webmidi/MIDIInput.h"
+#include "modules/webmidi/MIDIInputMap.h"
 #include "modules/webmidi/MIDIOptions.h"
+#include "modules/webmidi/MIDIOutput.h"
+#include "modules/webmidi/MIDIOutputMap.h"
 #include "modules/webmidi/MIDIPort.h"
 #include "platform/AsyncMethodRunner.h"
 #include <v8.h>
@@ -51,14 +55,23 @@ MIDIAccess::MIDIAccess(PassOwnPtr<MIDIAccessor> accessor, bool sysexEnabled, con
 {
     ScriptWrappable::init(this);
     m_accessor->setClient(this);
+    HeapHashMap<String, Member<MIDIInput> > inputs;
+    HeapHashMap<String, Member<MIDIOutput> > outputs;
     for (size_t i = 0; i < ports.size(); ++i) {
         const MIDIAccessInitializer::PortDescriptor& port = ports[i];
         if (port.type == MIDIPort::MIDIPortTypeInput) {
-            m_inputs.append(MIDIInput::create(this, port.id, port.manufacturer, port.name, port.version));
+            inputs.add(port.id, MIDIInput::create(this, port.id, port.manufacturer, port.name, port.version));
+            m_inputKeys.append(port.id);
         } else {
-            m_outputs.append(MIDIOutput::create(this, m_outputs.size(), port.id, port.manufacturer, port.name, port.version));
+            outputs.add(port.id, MIDIOutput::create(this, outputs.size(), port.id, port.manufacturer, port.name, port.version));
         }
     }
+    if (inputs.size() + outputs.size() != ports.size()) {
+        // There are id-duplicate ports that violate the spec.
+        return;
+    }
+    m_inputs = new MIDIInputMap(inputs);
+    m_outputs = new MIDIOutputMap(outputs);
 }
 
 MIDIAccess::~MIDIAccess()
@@ -68,20 +81,23 @@ MIDIAccess::~MIDIAccess()
 void MIDIAccess::didAddInputPort(const String& id, const String& manufacturer, const String& name, const String& version)
 {
     ASSERT(isMainThread());
-    m_inputs.append(MIDIInput::create(this, id, manufacturer, name, version));
+    // We currently assume no ports will be added once an MIDIAccess object is
+    // created.
+    ASSERT_NOT_REACHED();
 }
 
 void MIDIAccess::didAddOutputPort(const String& id, const String& manufacturer, const String& name, const String& version)
 {
     ASSERT(isMainThread());
-    unsigned portIndex = m_outputs.size();
-    m_outputs.append(MIDIOutput::create(this, portIndex, id, manufacturer, name, version));
+    // We currently assume no ports will be added once an MIDIAccess object is
+    // created.
+    ASSERT_NOT_REACHED();
 }
 
 void MIDIAccess::didReceiveMIDIData(unsigned portIndex, const unsigned char* data, size_t length, double timeStamp)
 {
     ASSERT(isMainThread());
-    if (portIndex >= m_inputs.size())
+    if (portIndex >= m_inputs->size())
         return;
 
     // Convert from time in seconds which is based on the time coordinate system of monotonicallyIncreasingTime()
@@ -92,12 +108,13 @@ void MIDIAccess::didReceiveMIDIData(unsigned portIndex, const unsigned char* dat
 
     double timeStampInMilliseconds = 1000 * document->loader()->timing()->monotonicTimeToZeroBasedDocumentTime(timeStamp);
 
-    m_inputs[portIndex]->didReceiveMIDIData(portIndex, data, length, timeStampInMilliseconds);
+    ASSERT(m_inputs->has(m_inputKeys[portIndex]));
+    m_inputs->get(m_inputKeys[portIndex])->didReceiveMIDIData(portIndex, data, length, timeStampInMilliseconds);
 }
 
 void MIDIAccess::sendMIDIData(unsigned portIndex, const unsigned char* data, size_t length, double timeStampInMilliseconds)
 {
-    if (!data || !length || portIndex >= m_outputs.size())
+    if (!data || !length || portIndex >= m_outputs->size())
         return;
     // Convert from a time in milliseconds (a DOMHighResTimeStamp) according to the same time coordinate system as performance.now()
     // into a time in seconds which is based on the time coordinate system of monotonicallyIncreasingTime().