gecko/dom/xslt/xpath/txXPathNode.h

/* -*- Mode: C++; tab-width: 4; 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 txXPathNode_h__
#define txXPathNode_h__

#include "nsAutoPtr.h"
#include "nsIContent.h"
#include "nsIDocument.h"
#include "nsIDOMNode.h"
#include "nsNameSpaceManager.h"
#include "nsContentUtils.h" // For NameSpaceManager().

typedef nsIDOMNode txXPathNodeType;

class txXPathNode
{
public:
    bool operator==(const txXPathNode& aNode) const;
    bool operator!=(const txXPathNode& aNode) const
    {
        return !(*this == aNode);
    }
    ~txXPathNode();

private:
    friend class txNodeSet;
    friend class txXPathNativeNode;
    friend class txXPathNodeUtils;
    friend class txXPathTreeWalker;

    txXPathNode(const txXPathNode& aNode);

    txXPathNode(nsIDocument* aDocument) : mNode(aDocument),
                                          mRefCountRoot(0),
                                          mIndex(eDocument)
    {
        MOZ_COUNT_CTOR(txXPathNode);
    }
    txXPathNode(nsINode *aNode, uint32_t aIndex, nsINode *aRoot)
        : mNode(aNode),
          mRefCountRoot(aRoot ? 1 : 0),
          mIndex(aIndex)
    {
        MOZ_COUNT_CTOR(txXPathNode);
        if (aRoot) {
            NS_ADDREF(aRoot);
        }
    }

    static nsINode *RootOf(nsINode *aNode)
    {
        nsINode *ancestor, *root = aNode;
        while ((ancestor = root->GetParentNode())) {
            root = ancestor;
        }
        return root;
    }
    nsINode *Root() const
    {
        return RootOf(mNode);
    }
    nsINode *GetRootToAddRef() const
    {
        return mRefCountRoot ? Root() : nullptr;
    }

    bool isDocument() const
    {
        return mIndex == eDocument;
    }
    bool isContent() const
    {
        return mIndex == eContent;
    }
    bool isAttribute() const
    {
        return mIndex != eDocument && mIndex != eContent;
    }

    nsIContent* Content() const
    {
        NS_ASSERTION(isContent() || isAttribute(), "wrong type");
        return static_cast<nsIContent*>(mNode);
    }
    nsIDocument* Document() const
    {
        NS_ASSERTION(isDocument(), "wrong type");
        return static_cast<nsIDocument*>(mNode);
    }

    enum PositionType
    {
        eDocument = (1 << 30),
        eContent = eDocument - 1
    };

    nsINode* mNode;
    uint32_t mRefCountRoot : 1;
    uint32_t mIndex : 31;
};

class txNamespaceManager
{
public:
    static int32_t getNamespaceID(const nsAString& aNamespaceURI);
    static nsresult getNamespaceURI(const int32_t aID, nsAString& aResult);
};

/* static */
inline int32_t
txNamespaceManager::getNamespaceID(const nsAString& aNamespaceURI)
{
    int32_t namespaceID = kNameSpaceID_Unknown;
    nsContentUtils::NameSpaceManager()->
        RegisterNameSpace(aNamespaceURI, namespaceID);
    return namespaceID;
}

/* static */
inline nsresult
txNamespaceManager::getNamespaceURI(const int32_t aID, nsAString& aResult)
{
    return nsContentUtils::NameSpaceManager()->
        GetNameSpaceURI(aID, aResult);
}

inline bool
txXPathNode::operator==(const txXPathNode& aNode) const
{
    return mIndex == aNode.mIndex && mNode == aNode.mNode;
}

#endif /* txXPathNode_h__ */