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/*
* Copyright © 2016-2025 The LmdbJava Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package
org
.
lmdbjava
;
import
static
java
.
util
.
Objects
.
requireNonNull
;
import
static
org
.
lmdbjava
.
KeyRangeType
.
BACKWARD_ALL
;
import
static
org
.
lmdbjava
.
KeyRangeType
.
FORWARD_ALL
;
/**
* Limits the range and direction of keys to iterate.
*
* <p>Immutable once created (although the buffers themselves may not be).
*
* @param <T> buffer type
*/
public
final
class
KeyRange
<
T
> {
private
static
final
KeyRange
<?>
BK
=
new
KeyRange
<>(
BACKWARD_ALL
,
null
,
null
);
private
static
final
KeyRange
<?>
FW
=
new
KeyRange
<>(
FORWARD_ALL
,
null
,
null
);
private
final
T
start
;
private
final
T
stop
;
private
final
KeyRangeType
type
;
/**
* Construct a key range.
*
* <p>End user code may find it more expressive to use one of the static methods provided on this
* class.
*
* @param type key type
* @param start start key (required if applicable for the passed range type)
* @param stop stop key (required if applicable for the passed range type)
*/
public
KeyRange
(
final
KeyRangeType
type
,
final
T
start
,
final
T
stop
) {
requireNonNull
(
type
,
"Key range type is required"
);
if
(
type
.
isStartKeyRequired
()) {
requireNonNull
(
start
,
"Start key is required for this key range type"
);
}
if
(
type
.
isStopKeyRequired
()) {
requireNonNull
(
stop
,
"Stop key is required for this key range type"
);
}
this
.
start
=
start
;
this
.
stop
=
stop
;
this
.
type
=
type
;
}
/**
* Create a {@link KeyRangeType#FORWARD_ALL} range.
*
* @param <T> buffer type
* @return a key range (never null)
*/
public
static
<
T
>
KeyRange
<
T
>
all
() {
return
(
KeyRange
<
T
>)
FW
;
}
/**
* Create a {@link KeyRangeType#BACKWARD_ALL} range.
*
* @param <T> buffer type
* @return a key range (never null)
*/
public
static
<
T
>
KeyRange
<
T
>
allBackward
() {
return
(
KeyRange
<
T
>)
BK
;
}
/**
* Create a {@link KeyRangeType#FORWARD_AT_LEAST} range.
*
* @param <T> buffer type
* @param start start key (required)
* @return a key range (never null)
*/
public
static
<
T
>
KeyRange
<
T
>
atLeast
(
final
T
start
) {
return
new
KeyRange
<>(
KeyRangeType
.
FORWARD_AT_LEAST
,
start
,
null
);
}
/**
* Create a {@link KeyRangeType#BACKWARD_AT_LEAST} range.
*
* @param <T> buffer type
* @param start start key (required)
* @return a key range (never null)
*/
public
static
<
T
>
KeyRange
<
T
>
atLeastBackward
(
final
T
start
) {
return
new
KeyRange
<>(
KeyRangeType
.
BACKWARD_AT_LEAST
,
start
,
null
);
}
/**
* Create a {@link KeyRangeType#FORWARD_AT_MOST} range.
*
* @param <T> buffer type
* @param stop stop key (required)
* @return a key range (never null)
*/
public
static
<
T
>
KeyRange
<
T
>
atMost
(
final
T
stop
) {
return
new
KeyRange
<>(
KeyRangeType
.
FORWARD_AT_MOST
,
null
,
stop
);
}
/**
* Create a {@link KeyRangeType#BACKWARD_AT_MOST} range.
*
* @param <T> buffer type
* @param stop stop key (required)
* @return a key range (never null)
*/
public
static
<
T
>
KeyRange
<
T
>
atMostBackward
(
final
T
stop
) {
return
new
KeyRange
<>(
KeyRangeType
.
BACKWARD_AT_MOST
,
null
,
stop
);
}
/**
* Create a {@link KeyRangeType#FORWARD_CLOSED} range.
*
* @param <T> buffer type
* @param start start key (required)
* @param stop stop key (required)
* @return a key range (never null)
*/
public
static
<
T
>
KeyRange
<
T
>
closed
(
final
T
start
,
final
T
stop
) {
return
new
KeyRange
<>(
KeyRangeType
.
FORWARD_CLOSED
,
start
,
stop
);
}
/**
* Create a {@link KeyRangeType#BACKWARD_CLOSED} range.
*
* @param <T> buffer type
* @param start start key (required)
* @param stop stop key (required)
* @return a key range (never null)
*/
public
static
<
T
>
KeyRange
<
T
>
closedBackward
(
final
T
start
,
final
T
stop
) {
return
new
KeyRange
<>(
KeyRangeType
.
BACKWARD_CLOSED
,
start
,
stop
);
}
/**
* Create a {@link KeyRangeType#FORWARD_CLOSED_OPEN} range.
*
* @param <T> buffer type
* @param start start key (required)
* @param stop stop key (required)
* @return a key range (never null)
*/
public
static
<
T
>
KeyRange
<
T
>
closedOpen
(
final
T
start
,
final
T
stop
) {
return
new
KeyRange
<>(
KeyRangeType
.
FORWARD_CLOSED_OPEN
,
start
,
stop
);
}
/**
* Create a {@link KeyRangeType#BACKWARD_CLOSED_OPEN} range.
*
* @param <T> buffer type
* @param start start key (required)
* @param stop stop key (required)
* @return a key range (never null)
*/
public
static
<
T
>
KeyRange
<
T
>
closedOpenBackward
(
final
T
start
,
final
T
stop
) {
return
new
KeyRange
<>(
KeyRangeType
.
BACKWARD_CLOSED_OPEN
,
start
,
stop
);
}
/**
* Create a {@link KeyRangeType#FORWARD_GREATER_THAN} range.
*
* @param <T> buffer type
* @param start start key (required)
* @return a key range (never null)
*/
public
static
<
T
>
KeyRange
<
T
>
greaterThan
(
final
T
start
) {
return
new
KeyRange
<>(
KeyRangeType
.
FORWARD_GREATER_THAN
,
start
,
null
);
}
/**
* Create a {@link KeyRangeType#BACKWARD_GREATER_THAN} range.
*
* @param <T> buffer type
* @param start start key (required)
* @return a key range (never null)
*/
public
static
<
T
>
KeyRange
<
T
>
greaterThanBackward
(
final
T
start
) {
return
new
KeyRange
<>(
KeyRangeType
.
BACKWARD_GREATER_THAN
,
start
,
null
);
}
/**
* Create a {@link KeyRangeType#FORWARD_LESS_THAN} range.
*
* @param <T> buffer type
* @param stop stop key (required)
* @return a key range (never null)
*/
public
static
<
T
>
KeyRange
<
T
>
lessThan
(
final
T
stop
) {
return
new
KeyRange
<>(
KeyRangeType
.
FORWARD_LESS_THAN
,
null
,
stop
);
}
/**
* Create a {@link KeyRangeType#BACKWARD_LESS_THAN} range.
*
* @param <T> buffer type
* @param stop stop key (required)
* @return a key range (never null)
*/
public
static
<
T
>
KeyRange
<
T
>
lessThanBackward
(
final
T
stop
) {
return
new
KeyRange
<>(
KeyRangeType
.
BACKWARD_LESS_THAN
,
null
,
stop
);
}
/**
* Create a {@link KeyRangeType#FORWARD_OPEN} range.
*
* @param <T> buffer type
* @param start start key (required)
* @param stop stop key (required)
* @return a key range (never null)
*/
public
static
<
T
>
KeyRange
<
T
>
open
(
final
T
start
,
final
T
stop
) {
return
new
KeyRange
<>(
KeyRangeType
.
FORWARD_OPEN
,
start
,
stop
);
}
/**
* Create a {@link KeyRangeType#BACKWARD_OPEN} range.
*
* @param <T> buffer type
* @param start start key (required)
* @param stop stop key (required)
* @return a key range (never null)
*/
public
static
<
T
>
KeyRange
<
T
>
openBackward
(
final
T
start
,
final
T
stop
) {
return
new
KeyRange
<>(
KeyRangeType
.
BACKWARD_OPEN
,
start
,
stop
);
}
/**
* Create a {@link KeyRangeType#FORWARD_OPEN_CLOSED} range.
*
* @param <T> buffer type
* @param start start key (required)
* @param stop stop key (required)
* @return a key range (never null)
*/
public
static
<
T
>
KeyRange
<
T
>
openClosed
(
final
T
start
,
final
T
stop
) {
return
new
KeyRange
<>(
KeyRangeType
.
FORWARD_OPEN_CLOSED
,
start
,
stop
);
}
/**
* Create a {@link KeyRangeType#BACKWARD_OPEN_CLOSED} range.
*
* @param <T> buffer type
* @param start start key (required)
* @param stop stop key (required)
* @return a key range (never null)
*/
public
static
<
T
>
KeyRange
<
T
>
openClosedBackward
(
final
T
start
,
final
T
stop
) {
return
new
KeyRange
<>(
KeyRangeType
.
BACKWARD_OPEN_CLOSED
,
start
,
stop
);
}
/**
* Start key.
*
* @return start key (may be null)
*/
public
T
getStart
() {
return
start
;
}
/**
* Stop key.
*
* @return stop key (may be null)
*/
public
T
getStop
() {
return
stop
;
}
/**
* Key range type.
*
* @return type (never null)
*/
public
KeyRangeType
getType
() {
return
type
;
}
}
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