Web MIDI: implement MIDIAccess

Source/modules/webmidi/MIDIAccess.cpp

+/*
+ * Copyright (C) 2013 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:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "modules/webmidi/MIDIAccess.h"
+
+#include "core/dom/ExceptionCode.h"
+#include "modules/webmidi/MIDIConnectionEvent.h"
+#include "modules/webmidi/MIDIInput.h"
+#include "modules/webmidi/MIDIOutput.h"
+#include "modules/webmidi/MIDIPort.h"
+
+namespace WebCore {
+
+PassRefPtr<MIDIAccess> MIDIAccess::create(ScriptExecutionContext* context)
+{
+    RefPtr<MIDIAccess> midiAccess(adoptRef(new MIDIAccess(context)));
+    midiAccess->suspendIfNeeded();
+    return midiAccess.release();
+}
+
+MIDIAccess::~MIDIAccess()
+{
+    stop();
+}
+
+MIDIAccess::MIDIAccess(ScriptExecutionContext* context)
+    : ActiveDOMObject(context)
+{
+}
+
+const MIDIPortVector& MIDIAccess::getInputs()
+{
+    return m_inputs;
+}
+
+const MIDIPortVector& MIDIAccess::getOutputs()
+{
+    return m_outputs;
+}
+
+RefPtr<MIDIInput> MIDIAccess::getInput(PassRefPtr<MIDIPort> target, ExceptionCode& ec)
+{
+    return getInput(target->id(), ec);
+}
+
+RefPtr<MIDIInput> MIDIAccess::getInput(const String& id, ExceptionCode& ec)
+{
+    for (MIDIPortVector::const_iterator i = m_inputs.begin(); i != m_inputs.end(); ++i) {
+        if ((*i)->id() != id)

[Chris Rogers, 2013/04/29 19:22:09]

Instead of checking for inequality and using "continue", I'd check for equality,
returning the created MIDIInput and avoid the continue

+            continue;
+        return MIDIInput::create(*i);
+    }

[Chris Rogers, 2013/04/29 19:22:09]

It would be good to add a comment here to describe that the rest of the checking
(using m_outputs) is just for deciding what exception code, since only ports
from m_inputs will return a valid MIDIInput

+    for (MIDIPortVector::const_iterator i = m_outputs.begin(); i != m_outputs.end(); ++i) {
+        if ((*i)->id() != id)
+            continue;
+        ec = INVALID_ACCESS_ERR;
+        return 0;
+    }
+    ec = NOT_FOUND_ERR;
+    return 0;
+}
+
+RefPtr<MIDIInput> MIDIAccess::getInput(short index, ExceptionCode& ec)
+{
+    if (static_cast<size_t>(index) < m_inputs.size())
+        return getInput(m_inputs[index]->id(), ec);
+
+    ec = NOT_FOUND_ERR;
+    return 0;
+}
+
+RefPtr<MIDIOutput> MIDIAccess::getOutput(PassRefPtr<MIDIPort> target, ExceptionCode& ec)
+{
+    return getOutput(target->id(), ec);
+}
+
+RefPtr<MIDIOutput> MIDIAccess::getOutput(const String& id, ExceptionCode& ec)
+{
+    for (MIDIPortVector::const_iterator i = m_outputs.begin(); i != m_outputs.end(); ++i) {
+        if ((*i)->id() != id)
+            continue;
+        return MIDIOutput::create(*i);
+    }
+    for (MIDIPortVector::const_iterator i = m_inputs.begin(); i != m_inputs.end(); ++i) {
+        if ((*i)->id() != id)
+            continue;
+        ec = INVALID_ACCESS_ERR;
+        return 0;
+    }
+    ec = NOT_FOUND_ERR;
+    return 0;
+}
+
+RefPtr<MIDIOutput> MIDIAccess::getOutput(short index, ExceptionCode& ec)
+{
+    if (static_cast<size_t>(index) < m_outputs.size())
+        return getOutput(m_outputs[index]->id(), ec);
+
+    ec = NOT_FOUND_ERR;
+    return 0;
+}
+
+} // namespace WebCore