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/*
* Copyright (c) 2006 The Regents of The University of Michigan
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* 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;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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 THE COPYRIGHT
* OWNER 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.
*
* Authors: Ali Saidi
*/
#ifndef __BASE_RANGE_MAP_HH__
#define __BASE_RANGE_MAP_HH__
#include <map>
#include <utility>
#include "base/range.hh"
/**
* The range_map uses an STL map to implement an interval tree. The
* type of both the key (range) and the value are template
* parameters. It can, for example, be used for address decoding,
* using a range of addresses to map to ports.
*/
template <class T,class V>
class range_map
{
private:
typedef std::map<Range<T>,V> RangeMap;
RangeMap tree;
public:
typedef typename RangeMap::iterator iterator;
typedef typename RangeMap::const_iterator const_iterator;
template <class U>
const_iterator
find(const Range<U> &r) const
{
const_iterator i;
i = tree.upper_bound(r);
if (i == tree.begin()) {
if (i->first.start <= r.end && i->first.end >= r.start)
return i;
else
// Nothing could match, so return end()
return tree.end();
}
--i;
if (i->first.start <= r.end && i->first.end >= r.start)
return i;
return tree.end();
}
template <class U>
iterator
find(const Range<U> &r)
{
iterator i;
i = tree.upper_bound(r);
if (i == tree.begin()) {
if (i->first.start <= r.end && i->first.end >= r.start)
return i;
else
// Nothing could match, so return end()
return tree.end();
}
--i;
if (i->first.start <= r.end && i->first.end >= r.start)
return i;
return tree.end();
}
template <class U>
const_iterator
find(const U &r) const
{
return find(RangeSize(r, 1));
}
template <class U>
iterator
find(const U &r)
{
return find(RangeSize(r, 1));
}
template <class U>
bool
intersect(const Range<U> &r)
{
iterator i;
i = find(r);
if (i != tree.end())
return true;
return false;
}
template <class U,class W>
iterator
insert(const Range<U> &r, const W d)
{
if (intersect(r))
return tree.end();
return tree.insert(std::make_pair(r, d)).first;
}
size_t
erase(T k)
{
return tree.erase(k);
}
void
erase(iterator p)
{
tree.erase(p);
}
void
erase(iterator p, iterator q)
{
tree.erase(p,q);
}
void
clear()
{
tree.erase(tree.begin(), tree.end());
}
const_iterator
begin() const
{
return tree.begin();
}
iterator
begin()
{
return tree.begin();
}
const_iterator
end() const
{
return tree.end();
}
iterator
end()
{
return tree.end();
}
size_t
size() const
{
return tree.size();
}
bool
empty() const
{
return tree.empty();
}
};
#endif //__BASE_RANGE_MAP_HH__
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