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nsURIHashKey

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef nsURIHashKey_h__
#define nsURIHashKey_h__

#include "PLDHashTable.h"
#include "nsCOMPtr.h"
#include "nsIURI.h"
#include "nsHashKeys.h"
#include "mozilla/Unused.h"

/**
 * Hashtable key class to use with nsTHashtable/nsBaseHashtable
 */
class nsURIHashKey : public PLDHashEntryHdr
{
public:
    typedef nsIURI* KeyType;
    typedef const nsIURI* KeyTypePointer;

    explicit nsURIHashKey(const nsIURI* aKey) :
        mKey(const_cast<nsIURI*>(aKey)) { MOZ_COUNT_CTOR(nsURIHashKey); }
    nsURIHashKey(const nsURIHashKey& toCopy) :
        mKey(toCopy.mKey) { MOZ_COUNT_CTOR(nsURIHashKey); }
    ~nsURIHashKey() { MOZ_COUNT_DTOR(nsURIHashKey); }

    nsIURI* GetKey() const { return mKey; }

    bool KeyEquals(const nsIURI* aKey) const {
        bool eq;
        if (!mKey) {
            return !aKey;
        }
        if (NS_SUCCEEDED(mKey->Equals(const_cast<nsIURI*>(aKey), &eq))) {
            return eq;
        }
        return false;
    }

    static const nsIURI* KeyToPointer(nsIURI* aKey) { return aKey; }
    static PLDHashNumber HashKey(const nsIURI* aKey) {
        if (!aKey) {
            // If the key is null, return hash for empty string.
            return mozilla::HashString(EmptyCString());
        }
        nsAutoCString spec;
        // If GetSpec() fails, ignoring the failure and proceeding with an
        // empty |spec| seems like the best thing to do.
        mozilla::Unused << const_cast<nsIURI*>(aKey)->GetSpec(spec);
        return mozilla::HashString(spec);
    }

    enum { ALLOW_MEMMOVE = true };

protected:
    nsCOMPtr<nsIURI> mKey;
};

#endif // nsURIHashKey_h__