Add Maplike<> utility mixin class for implementing maplike interfaces

Source/modules/encryptedmedia/MediaKeyStatusMap.cpp

 // Copyright 2015 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.
 
 #include "config.h"
 #include "modules/encryptedmedia/MediaKeyStatusMap.h"
 
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/ScriptState.h"
 #include "core/dom/DOMArrayBuffer.h"
@@ skipping 32 matching lines @@
         : m_keyId(DOMArrayBuffer::create(keyId.data(), keyId.size()))
         , m_status(status)
     {
     }
 
     RefPtr<DOMArrayBuffer> m_keyId;
     const String m_status;
 };
 
 // Represents an Iterator that loops through the set of MapEntrys.
-class MapIterationSource final : public PairIterable<DOMArrayBuffer*, String>::IterationSource {
+class MapIterationSource final : public PairIterable<ArrayBufferOrArrayBufferView, String>::IterationSource {
 public:
     MapIterationSource(MediaKeyStatusMap* map)
         : m_map(map)
         , m_current(0)
     {
     }
 
-    bool next(ScriptState* scriptState, DOMArrayBuffer*& key, String& value, ExceptionState&) override
+    bool next(ScriptState* scriptState, ArrayBufferOrArrayBufferView& key, String& value, ExceptionState&) override
     {
         // This simply advances an index and returns the next value if any,
         // so if the iterated object is mutated values may be skipped.
         if (m_current >= m_map->size())
             return false;
 
         const auto& entry = m_map->at(m_current++);
-        key = entry.keyId();
+        key.setArrayBuffer(entry.keyId());
         value = entry.status();
         return true;
     }
 
-    virtual void trace(Visitor* visitor) override
+    void trace(Visitor* visitor) override
     {
         visitor->trace(m_map);
-        PairIterable<DOMArrayBuffer*, String>::IterationSource::trace(visitor);
+        PairIterable<ArrayBufferOrArrayBufferView, String>::IterationSource::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 MediaKeyStatusMap> m_map;
     size_t m_current;
 };
 
 void MediaKeyStatusMap::clear()
 {
     m_entries.clear();
 }
 
 void MediaKeyStatusMap::addEntry(WebData keyId, const String& status)
 {
     m_entries.append(MapEntry::create(keyId, status));
 }
 
 const MediaKeyStatusMap::MapEntry& MediaKeyStatusMap::at(size_t index) const
 {
     BLINK_ASSERT(index < m_entries.size());
     return *m_entries.at(index);
 }
 
-String MediaKeyStatusMap::get(const DOMArrayPiece& key)
-{
-    // If |key| is not found this returns the null string. However, it shows
-    // up in JavaScript as "".
-    size_t index = indexOf(key);
-    return (index < m_entries.size()) ? at(index).status() : String();
-}
-
-bool MediaKeyStatusMap::has(const DOMArrayPiece& key) const
-{
-    return indexOf(key) < m_entries.size();
-}
-
 size_t MediaKeyStatusMap::indexOf(const DOMArrayPiece& key) const
 {
     for (size_t index = 0; index < m_entries.size(); ++index) {
         const auto& current = m_entries.at(index)->keyId();
         if (key == *current)
             return index;
     }
 
     // Not found, so return an index outside the valid range.
     return m_entries.size();
 }
 
-PairIterable<DOMArrayBuffer*, String>::IterationSource* MediaKeyStatusMap::startIteration(ScriptState*, ExceptionState&)
+PairIterable<ArrayBufferOrArrayBufferView, String>::IterationSource* MediaKeyStatusMap::startIteration(ScriptState*, ExceptionState&)
 {
     return new MapIterationSource(this);
 }
 
+bool MediaKeyStatusMap::getMapEntry(ScriptState*, const ArrayBufferOrArrayBufferView& key, String& value, ExceptionState&)
+{
+    size_t index = indexOf(key);
+    if (index < m_entries.size()) {
+        value = at(index).status();
+        return true;
+    }
+    return false;
+}
+
 void MediaKeyStatusMap::trace(Visitor* visitor)
 {
     visitor->trace(m_entries);
 }
 
 } // namespace blink