Source/core/dom/DOMNamedFlowCollection.cpp

/*
 * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
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 * modification, are permitted provided that the following conditions
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER "AS IS" AND ANY
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#include "config.h"
#include "core/dom/DOMNamedFlowCollection.h"

#include "RuntimeEnabledFeatures.h"
#include "core/dom/NamedFlow.h"
#include "core/dom/NamedFlowCollection.h"
#include "wtf/text/StringHash.h"

namespace WebCore {

DOMNamedFlowCollection::DOMNamedFlowCollection(const Vector<NamedFlow*>& namedFlows)
{
    ASSERT(RuntimeEnabledFeatures::cssRegionsEnabled());
    ScriptWrappable::init(this);
    for (Vector<NamedFlow*>::const_iterator it = namedFlows.begin(); it != namedFlows.end(); ++it)
        m_namedFlows.add(*it);
}

unsigned long DOMNamedFlowCollection::length() const
{
    return m_namedFlows.size();
}

PassRefPtr<NamedFlow> DOMNamedFlowCollection::item(unsigned long index) const
{
    if (index >= static_cast<unsigned long>(m_namedFlows.size()))
        return 0;
    DOMNamedFlowSet::const_iterator it = m_namedFlows.begin();
    for (unsigned long i = 0; i < index; ++i)
        ++it;
    return *it;
}

PassRefPtr<NamedFlow> DOMNamedFlowCollection::namedItem(const AtomicString& name) const
{
    DOMNamedFlowSet::const_iterator it = m_namedFlows.find<String, DOMNamedFlowHashTranslator>(name);
    if (it != m_namedFlows.end())
        return *it;
    return 0;
}

bool DOMNamedFlowCollection::hasNamedItem(const AtomicString& name) const
{
    return namedItem(name);
}

// The HashFunctions object used by the HashSet to compare between RefPtr<NamedFlows>.
// It is safe to set safeToCompareToEmptyOrDeleted because the HashSet will never contain null pointers or deleted values.
struct DOMNamedFlowCollection::DOMNamedFlowHashFunctions {
    static unsigned hash(PassRefPtr<NamedFlow> key) { return DefaultHash<String>::Hash::hash(key->name()); }
    static bool equal(PassRefPtr<NamedFlow> a, PassRefPtr<NamedFlow> b) { return a->name() == b->name(); }
    static const bool safeToCompareToEmptyOrDeleted = true;
};

// The HashTranslator is used to lookup a RefPtr<NamedFlow> in the set using a name.
struct DOMNamedFlowCollection::DOMNamedFlowHashTranslator {
    static unsigned hash(const String& key) { return DefaultHash<String>::Hash::hash(key); }
    static bool equal(PassRefPtr<NamedFlow> a, const String& b) { return a->name() == b; }
};
} // namespace WebCore