Source/WebCore/dom/DOMNamedFlowCollection.cpp

/*
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 * Copyright (C) 2016 Apple Inc. All rights reserved.
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#include "config.h"
#include "DOMNamedFlowCollection.h"

#include "WebKitNamedFlow.h"
#include <wtf/text/AtomicStringHash.h>

namespace WebCore {

inline DOMNamedFlowCollection::DOMNamedFlowCollection(Vector<Ref<WebKitNamedFlow>>&& flows)
    : m_flows(WTFMove(flows))
{
}

Ref<DOMNamedFlowCollection> DOMNamedFlowCollection::create(Vector<Ref<WebKitNamedFlow>>&& flows)
{
    return adoptRef(*new DOMNamedFlowCollection(WTFMove(flows)));
}

DOMNamedFlowCollection::~DOMNamedFlowCollection()
{
}

WebKitNamedFlow* DOMNamedFlowCollection::item(unsigned index) const
{
    if (index >= m_flows.size())
        return nullptr;
    return const_cast<WebKitNamedFlow*>(m_flows[index].ptr());
}

struct DOMNamedFlowCollection::HashFunctions {
    static unsigned hash(const WebKitNamedFlow* key) { return AtomicStringHash::hash(key->name()); }
    static bool equal(const WebKitNamedFlow* a, const WebKitNamedFlow* b) { return a->name() == b->name(); }
    static const bool safeToCompareToEmptyOrDeleted = false;

    static unsigned hash(const AtomicString& key) { return AtomicStringHash::hash(key); }
    static bool equal(const WebKitNamedFlow* a, const AtomicString& b) { return a->name() == b; }
};

WebKitNamedFlow* DOMNamedFlowCollection::namedItem(const AtomicString& name) const
{
    if (m_flowsByName.isEmpty()) {
        // No need to optimize the case where m_flows is empty; will do nothing very quickly.
        for (auto& flow : m_flows)
            m_flowsByName.add(const_cast<WebKitNamedFlow*>(flow.ptr()));
    }
    auto it = m_flowsByName.find<HashFunctions>(name);
    if (it == m_flowsByName.end())
        return nullptr;
    return *it;
}

const Vector<AtomicString>& DOMNamedFlowCollection::supportedPropertyNames()
{
    if (m_flowNames.isEmpty()) {
        // No need to optimize the case where m_flows is empty; will do nothing relatively quickly.
        m_flowNames.reserveInitialCapacity(m_flows.size());
        for (auto& flow : m_flows)
            m_flowNames.uncheckedAppend(flow->name());
    }
    return m_flowNames;
}

} // namespace WebCore