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/**
* Copyright (C) 2013 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects
* for all of the code used other than as permitted herein. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you do not
* wish to do so, delete this exception statement from your version. If you
* delete this exception statement from all source files in the program,
* then also delete it in the license file.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/range_arithmetic.h"
namespace mongo {
using std::make_pair;
using std::pair;
using std::string;
using std::stringstream;
bool rangeContains(const BSONObj& inclusiveLower,
const BSONObj& exclusiveUpper,
const BSONObj& point) {
return point.woCompare(inclusiveLower) >= 0 && point.woCompare(exclusiveUpper) < 0;
}
bool rangeOverlaps(const BSONObj& inclusiveLower1,
const BSONObj& exclusiveUpper1,
const BSONObj& inclusiveLower2,
const BSONObj& exclusiveUpper2) {
return (exclusiveUpper1.woCompare(inclusiveLower2) > 0) &&
(exclusiveUpper2.woCompare(inclusiveLower1) > 0);
}
int compareRanges(const BSONObj& rangeMin1,
const BSONObj& rangeMax1,
const BSONObj& rangeMin2,
const BSONObj& rangeMax2) {
const int minCmp = rangeMin1.woCompare(rangeMin2);
if (minCmp != 0)
return minCmp;
return rangeMax1.woCompare(rangeMax2);
}
// Represents the start and end of an overlap of a tested range
typedef pair<RangeMap::const_iterator, RangeMap::const_iterator> OverlapBounds;
// Internal-only, shared functionality
OverlapBounds rangeMapOverlapBounds(const RangeMap& ranges,
const BSONObj& inclusiveLower,
const BSONObj& exclusiveUpper) {
// Returns the first chunk with a min key that is >= lower bound - the previous chunk
// might overlap.
RangeMap::const_iterator low = ranges.lower_bound(inclusiveLower);
// See if the previous chunk overlaps our range, not clear from just min key
if (low != ranges.begin()) {
RangeMap::const_iterator next = low;
--low;
// If the previous range's max value is lte our min value
if (low->second.woCompare(inclusiveLower) < 1) {
low = next;
}
}
// Returns the first chunk with a max key that is >= upper bound - implies the
// chunk does not overlap upper bound
RangeMap::const_iterator high = ranges.lower_bound(exclusiveUpper);
return OverlapBounds(low, high);
}
void getRangeMapOverlap(const RangeMap& ranges,
const BSONObj& inclusiveLower,
const BSONObj& exclusiveUpper,
RangeVector* overlap) {
overlap->clear();
OverlapBounds bounds = rangeMapOverlapBounds(ranges, inclusiveLower, exclusiveUpper);
for (RangeMap::const_iterator it = bounds.first; it != bounds.second; ++it) {
overlap->push_back(make_pair(it->first, it->second));
}
}
bool rangeMapOverlaps(const RangeMap& ranges,
const BSONObj& inclusiveLower,
const BSONObj& exclusiveUpper) {
OverlapBounds bounds = rangeMapOverlapBounds(ranges, inclusiveLower, exclusiveUpper);
return bounds.first != bounds.second;
}
bool rangeMapContains(const RangeMap& ranges,
const BSONObj& inclusiveLower,
const BSONObj& exclusiveUpper) {
OverlapBounds bounds = rangeMapOverlapBounds(ranges, inclusiveLower, exclusiveUpper);
if (bounds.first == ranges.end())
return false;
return bounds.first->first.woCompare(inclusiveLower) == 0 &&
bounds.first->second.woCompare(exclusiveUpper) == 0;
}
string rangeToString(const BSONObj& inclusiveLower, const BSONObj& exclusiveUpper) {
stringstream ss;
ss << "[" << inclusiveLower.toString() << ", " << exclusiveUpper.toString() << ")";
return ss.str();
}
string overlapToString(RangeVector overlap) {
stringstream ss;
for (RangeVector::const_iterator it = overlap.begin(); it != overlap.end(); ++it) {
if (it != overlap.begin())
ss << ", ";
ss << rangeToString(it->first, it->second);
}
return ss.str();
}
}
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