MutationObserverInterestGroup.h   [plain text]


/*
 * Copyright (C) 2011 Google Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
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 *
 *     * 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
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 * 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
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 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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#ifndef MutationObserverInterestGroup_h
#define MutationObserverInterestGroup_h

#if ENABLE(MUTATION_OBSERVERS)

#include "Document.h"
#include "Node.h"
#include "QualifiedName.h"
#include "WebKitMutationObserver.h"
#include <wtf/HashMap.h>
#include <wtf/PassOwnPtr.h>

namespace WebCore {

class MutationObserverInterestGroup {
public:
    static PassOwnPtr<MutationObserverInterestGroup> createForChildListMutation(Node* target)
    {
        if (!target->document()->hasMutationObserversOfType(WebKitMutationObserver::ChildList))
            return nullptr;

        MutationRecordDeliveryOptions oldValueFlag = 0;
        return createIfNeeded(target, WebKitMutationObserver::ChildList, oldValueFlag);
    }

    static PassOwnPtr<MutationObserverInterestGroup> createForCharacterDataMutation(Node* target)
    {
        if (!target->document()->hasMutationObserversOfType(WebKitMutationObserver::CharacterData))
            return nullptr;

        return createIfNeeded(target, WebKitMutationObserver::CharacterData, WebKitMutationObserver::CharacterDataOldValue);
    }

    static PassOwnPtr<MutationObserverInterestGroup> createForAttributesMutation(Node* target, const QualifiedName& attributeName)
    {
        if (!target->document()->hasMutationObserversOfType(WebKitMutationObserver::Attributes))
            return nullptr;

        return createIfNeeded(target, WebKitMutationObserver::Attributes, WebKitMutationObserver::AttributeOldValue, &attributeName);
    }

    bool isOldValueRequested();
    void enqueueMutationRecord(PassRefPtr<MutationRecord>);

private:
    static PassOwnPtr<MutationObserverInterestGroup> createIfNeeded(Node* target, WebKitMutationObserver::MutationType, MutationRecordDeliveryOptions oldValueFlag, const QualifiedName* attributeName = 0);
    MutationObserverInterestGroup(HashMap<WebKitMutationObserver*, MutationRecordDeliveryOptions>& observers, MutationRecordDeliveryOptions oldValueFlag);

    bool hasOldValue(MutationRecordDeliveryOptions options) { return options & m_oldValueFlag; }

    HashMap<WebKitMutationObserver*, MutationRecordDeliveryOptions> m_observers;
    MutationRecordDeliveryOptions m_oldValueFlag;
};

}

#endif // ENABLE(MUTATION_OBSERVERS)

#endif // MutationObserverInterestGroup_h