diff -r 000000000000 -r 4f2f89ce4247 WebCore/dom/NodeWithIndex.h --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/WebCore/dom/NodeWithIndex.h Fri Sep 17 09:02:29 2010 +0300 @@ -0,0 +1,64 @@ +/* + * Copyright (C) 2008 Apple Inc. All Rights Reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. 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 distribution. + * + * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY + * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY + * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#ifndef NodeWithIndex_h +#define NodeWithIndex_h + +#include "Node.h" + +namespace WebCore { + +// For use when you want to get the index for a node repeatedly and +// only want to walk the child list to figure out the index once. +class NodeWithIndex { +public: + NodeWithIndex(Node* node) + : m_node(node) + , m_haveIndex(false) + { + ASSERT(node); + } + + Node* node() const { return m_node; } + + int index() const + { + if (!m_haveIndex) { + m_index = m_node->nodeIndex(); + m_haveIndex = true; + } + ASSERT(m_index == static_cast(m_node->nodeIndex())); + return m_index; + } + +private: + Node* m_node; + mutable bool m_haveIndex; + mutable int m_index; +}; + +} + +#endif