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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef MIDIPortMap_h
#define MIDIPortMap_h
#include "bindings/core/v8/ExceptionState.h"
#include "bindings/core/v8/ScriptState.h"
#include "bindings/core/v8/ScriptValue.h"
#include "bindings/core/v8/V8Binding.h"
#include "bindings/core/v8/V8IteratorResultValue.h"
#include "core/dom/Iterator.h"
#include "platform/heap/Handle.h"
#include "wtf/HashMap.h"
#include "wtf/text/StringHash.h"
#include "wtf/text/WTFString.h"
namespace blink {
template <typename T>
class MIDIPortMap : public GarbageCollected<MIDIPortMap<T> > {
public:
explicit MIDIPortMap(const HeapHashMap<String, Member<T> >& entries) : m_entries(entries) { }
// IDL attributes / methods
size_t size() const { return m_entries.size(); }
Iterator* keys();
Iterator* entries();
Iterator* values();
T* get(const String& key) const;
bool has(const String& key) const { return m_entries.contains(key); }
Iterator* iterator(ScriptState*, ExceptionState&) { return entries(); }
virtual void trace(Visitor* visitor)
{
visitor->trace(m_entries);
}
private:
typedef HeapHashMap<String, Member<T> > MapType;
typedef typename HeapHashMap<String, Member<T> >::const_iterator IteratorType;
struct KeySelector {
static const String& select(ScriptState*, IteratorType i) { return i->key; }
};
struct ValueSelector {
static T* select(ScriptState*, IteratorType i) { return i->value; }
};
struct EntrySelector {
static Vector<ScriptValue> select(ScriptState* scriptState, IteratorType i)
{
Vector<ScriptValue> entry;
entry.append(ScriptValue(scriptState, v8String(scriptState->isolate(), i->key)));
entry.append(ScriptValue(scriptState, toV8(i->value, scriptState->context()->Global(), scriptState->isolate())));
return entry;
}
};
// Note: This template class relies on the fact that m_map.m_entries will
// never be modified once it is created.
template <typename Selector>
class MapIterator : public Iterator {
public:
MapIterator(MIDIPortMap<T>* map, IteratorType iterator, IteratorType end)
: m_map(map)
, m_iterator(iterator)
, m_end(end)
{
}
virtual ScriptValue next(ScriptState* scriptState, ExceptionState&) override
{
if (m_iterator == m_end)
return v8IteratorResultDone(scriptState);
ScriptValue result = v8IteratorResult(scriptState, Selector::select(scriptState, m_iterator));
++m_iterator;
return result;
}
virtual ScriptValue next(ScriptState* scriptState, ScriptValue, ExceptionState& exceptionState) override
{
return next(scriptState, exceptionState);
}
virtual void trace(Visitor* visitor) override
{
visitor->trace(m_map);
Iterator::trace(visitor);
}
private:
// m_map is stored just for keeping it alive. It needs to be kept
// alive while JavaScript holds the iterator to it.
const Member<const MIDIPortMap<T> > m_map;
IteratorType m_iterator;
const IteratorType m_end;
};
const MapType m_entries;
};
template <typename T>
Iterator* MIDIPortMap<T>::keys()
{
return new MapIterator<KeySelector>(this, m_entries.begin(), m_entries.end());
}
template <typename T>
Iterator* MIDIPortMap<T>::entries()
{
return new MapIterator<EntrySelector>(this, m_entries.begin(), m_entries.end());
}
template <typename T>
Iterator* MIDIPortMap<T>::values()
{
return new MapIterator<ValueSelector>(this, m_entries.begin(), m_entries.end());
}
template <typename T>
T* MIDIPortMap<T>::get(const String& key) const
{
return has(key) ? m_entries.get(key) : 0;
}
} // namespace blink
#endif
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