Implement HTMLMediaElement::srcObject.

Source/core/html/MediaProvider.cpp

+/*
+ * Copyright (C) 2014 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:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ * 3. 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 "core/html/MediaProvider.h"
+
+#include "wtf/HashMap.h"
+#include "wtf/MainThread.h"
+#include "wtf/text/StringHash.h"
+
+namespace blink {
+
+class MediaProviderConverterContainer {
+public:
+    static MediaProviderConverterContainer& container();
+
+    void registerMediaProviderConverter(const String& interfaceName, const MediaProvider::Converter&);
+    virtual MediaProvider* convert(const ScriptValue&);
+
+private:
+    HashMap<String, MediaProvider::Converter> m_converters;
+};
+
+MediaProviderConverterContainer& MediaProviderConverterContainer::container()
+{
+    ASSERT(isMainThread());
+    DEFINE_STATIC_LOCAL(MediaProviderConverterContainer, instance, ());
+    return instance;
+}
+
+void MediaProviderConverterContainer::registerMediaProviderConverter(const String& interfaceName, const MediaProvider::Converter& converter)
+{
+    if (m_converters.get(interfaceName).isNull())
+        m_converters.set(interfaceName, converter);
+}
+
+MediaProvider* MediaProviderConverterContainer::convert(const ScriptValue& value)
+{
+    for (HashMap<String, MediaProvider::Converter>::iterator it = m_converters.begin(); it != m_converters.end(); ++it) {
+        MediaProvider* provider = (it->value)(value);
+        if (provider)
+            return provider;
+    }
+    return nullptr;
+}
+
+MediaProvider::MediaProvider(const String& interfaceName, const Converter& converter)
+{
+    MediaProviderConverterContainer& container = MediaProviderConverterContainer::container();
+    container.registerMediaProviderConverter(interfaceName, converter);
+}
+
+MediaProvider* MediaProvider::convert(const ScriptValue& value)
+{
+    MediaProviderConverterContainer& container = MediaProviderConverterContainer::container();
+    return container.convert(value);
+}
+
+} // namespace blink