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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.
*/
#pragma once
#include "mongo/db/jsobj.h"
#include "mongo/util/mongoutils/str.h"
namespace mongo {
/** A range of values for one field. */
struct Interval {
// No BSONValue means we have to keep a BSONObj and pointers (BSONElement) into it.
// 'start' may not point at the first field in _intervalData.
// 'end' may not point at the last field in _intervalData.
// 'start' and 'end' may point at the same field.
BSONObj _intervalData;
// Start and End must be ordered according to the index order.
BSONElement start;
bool startInclusive;
BSONElement end;
bool endInclusive;
/** Creates an empty interval */
Interval();
std::string toString() const {
mongoutils::str::stream ss;
if (startInclusive) {
ss << "[";
}
else {
ss << "(";
}
// false means omit the field name
ss << start.toString(false);
ss << ", ";
ss << end.toString(false);
if (endInclusive) {
ss << "]";
}
else {
ss << ")";
}
return ss;
}
/**
* Creates an interval that starts at the first field of 'base' and ends at the second
* field of 'base'. (In other words, 'base' is a bsonobj with at least two elements, of
* which we don't care about field names.)
*
* The interval's extremities are closed or not depending on whether
* 'start'/'endIncluded' are true or not.
*/
Interval(BSONObj base, bool startIncluded, bool endIncluded);
/** Sets the current interval to the given values (see constructor) */
void init(BSONObj base, bool startIncluded, bool endIncluded);
/**
* Returns true if an empty-constructed interval hasn't been init()-ialized yet
*/
bool isEmpty() const;
/**
* Does this interval represent exactly one point?
*/
bool isPoint() const;
/**
* Returns true if start is same as end and interval is open at either end
*/
bool isNull() const;
//
// Comparison with other intervals
//
/**
* Returns true if 'this' is the same interval as 'other'
*/
bool equals(const Interval& other) const;
/**
* Returns true if 'this' overlaps with 'other', false otherwise.
*/
bool intersects(const Interval& rhs) const;
/**
* Returns true if 'this' is within 'other', false otherwise.
*/
bool within(const Interval& other) const;
/**
* Returns true if 'this' is located before 'other', false otherwise.
*/
bool precedes(const Interval& other) const;
/** Returns how 'this' compares to 'other' */
enum IntervalComparison {
//
// There is some intersection.
//
// The two intervals are *exactly* equal.
INTERVAL_EQUALS,
// 'this' contains the other interval.
INTERVAL_CONTAINS,
// 'this' is contained by the other interval.
INTERVAL_WITHIN,
// The two intervals intersect and 'this' is before the other interval.
INTERVAL_OVERLAPS_BEFORE,
// The two intervals intersect and 'this is after the other interval.
INTERVAL_OVERLAPS_AFTER,
//
// There is no intersection.
//
INTERVAL_PRECEDES,
// This happens if we have [a,b) [b,c]
INTERVAL_PRECEDES_COULD_UNION,
INTERVAL_SUCCEEDS,
INTERVAL_UNKNOWN
};
IntervalComparison compare(const Interval& other) const;
/**
* toString for IntervalComparison
*/
static std::string cmpstr(IntervalComparison c);
//
// Mutation of intervals
//
/**
* Swap start and end points of interval.
*/
void reverse();
/**
* Updates 'this' with the intersection of 'this' and 'other'. If 'this' and 'other'
* have been compare()d before, that result can be optionally passed in 'cmp'
*/
void intersect(const Interval& other, IntervalComparison cmp = INTERVAL_UNKNOWN);
/**
* Updates 'this" with the union of 'this' and 'other'. If 'this' and 'other' have
* been compare()d before, that result can be optionaly passed in 'cmp'.
*/
void combine(const Interval& other, IntervalComparison cmp = INTERVAL_UNKNOWN);
};
inline bool operator==(const Interval& lhs, const Interval& rhs) {
return lhs.compare(rhs) == Interval::INTERVAL_EQUALS;
}
} // namespace mongo
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