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GeezerVison is showing github.com — lmdbjava/src/main/java/org/lmdbjava/DbiFlags.java at master · lmdbjava/lmdbjava

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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 java.util.EnumSet;
import java.util.Set;
/** Flags for use when opening a {@link Dbi}. */
public enum DbiFlags implements MaskedFlag, DbiFlagSet {
/**
* Use reverse string keys.
*
* <p>Keys are strings to be compared in reverse order, from the end of the strings to the
* beginning. By default, keys are treated as strings and compared from beginning to end.
*/
MDB_REVERSEKEY(0x02),
/**
* Use sorted duplicates.
*
* <p>Duplicate keys may be used in the database. Or, from another perspective, keys may have
* multiple data items, stored in sorted order. By default, keys must be unique and may have only
* a single data item.
*/
MDB_DUPSORT(0x04),
/**
* Numeric keys in native byte order: either unsigned int or size_t. <strong>The keys must all be
* of the same size.</strong>
*
* <p>This is an optimisation that is available when your keys are 4 or 8 byte unsigned numeric
* values. There are performance benefits for both ordered and un-ordered puts as compared to not
* using this flag.
*
* <p>When writing the key to the buffer you must write it in native order and subsequently read
* any keys retrieved from LMDB (via cursor or get method) also using native order.
*
* <p>For more information, see <a
* href="https://github.com/lmdbjava/lmdbjava/wiki/Keys#numeric-keys">Numeric Keys</a> in the
* LmdbJava wiki.
*/
MDB_INTEGERKEY(0x08),
/**
* With {@link #MDB_DUPSORT}, sorted dup items have fixed size.
*
* <p>This flag may only be used in combination with {@link #MDB_DUPSORT}. This option tells the
* library that the data items for this database are all the same size, which allows further
* optimizations in storage and retrieval. When all data items are the same size, the {@link
* SeekOp#MDB_GET_MULTIPLE} and {@link SeekOp#MDB_NEXT_MULTIPLE} cursor operations may be used to
* retrieve multiple items at once.
*/
MDB_DUPFIXED(0x10),
/**
* With {@link #MDB_DUPSORT}, dups are {@link #MDB_INTEGERKEY}-style integers.
*
* <p>This option specifies that duplicate data items are binary integers, similar to {@link
* #MDB_INTEGERKEY} keys.
*/
MDB_INTEGERDUP(0x20),
/**
* With {@link #MDB_DUPSORT}, use reverse string dups.
*
* <p>This option specifies that duplicate data items should be compared as strings in reverse
* order.
*/
MDB_REVERSEDUP(0x40),
/**
* Create the named database if it doesn't exist.
*
* <p>This option is not allowed in a read-only transaction or a read-only environment.
*/
MDB_CREATE(0x4_0000);
private final int mask;
DbiFlags(final int mask) {
this.mask = mask;
}
@Override
public int getMask() {
return mask;
}
@Override
public Set<DbiFlags> getFlags() {
return EnumSet.of(this);
}
@Override
public boolean isSet(final DbiFlags flag) {
return this == flag;
}
@Override
public int size() {
return 1;
}
@Override
public boolean isEmpty() {
return false;
}
@Override
public String toString() {
return FlagSet.asString(this);
}
}
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