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MaskedFlag.java
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127 lines (115 loc) · 3.68 KB
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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 java.util.Arrays;
import java.util.Objects;
import java.util.function.Predicate;
import java.util.stream.Stream;
/** Indicates an enum that can provide integers for each of its values. */
public interface MaskedFlag {
/**
* Obtains the integer value for this enum which can be included in a mask.
*
* @return the integer value for combination into a mask
*/
int getMask();
/**
* Indicates if the flag must be propagated to the underlying C code of LMDB or not.
*
* @return the boolean value indicating the propagation
*/
default boolean isPropagatedToLmdb() {
return true;
}
/**
* Fetch the integer mask for all presented flags.
*
* @param <M> flag type
* @param flags to mask (null or empty returns zero)
* @return the integer mask for use in C
*/
@SafeVarargs
static <M extends MaskedFlag> int mask(final M... flags) {
return mask(false, flags);
}
/**
* Fetch the integer mask for all presented flags.
*
* @param <M> flag type
* @param flags to mask (null or empty returns zero)
* @return the integer mask for use in C
*/
static <M extends MaskedFlag> int mask(final Stream<M> flags) {
return mask(false, flags);
}
/**
* Fetch the integer mask for the presented flags.
*
* @param <M> flag type
* @param onlyPropagatedToLmdb if to include only the flags which are also propagate to the C code
* or all of them
* @param flags to mask (null or empty returns zero)
* @return the integer mask for use in C
*/
@SafeVarargs
static <M extends MaskedFlag> int mask(final boolean onlyPropagatedToLmdb, final M... flags) {
if (flags == null || flags.length == 0) {
return 0;
}
int result = 0;
for (final M flag : flags) {
if (flag == null) {
continue;
}
if (!onlyPropagatedToLmdb || flag.isPropagatedToLmdb()) {
result |= flag.getMask();
}
}
return result;
}
/**
* Fetch the integer mask for all presented flags.
*
* @param <M> flag type
* @param onlyPropagatedToLmdb if to include only the flags which are also propagate to the C code
* or all of them
* @param flags to mask
* @return the integer mask for use in C
*/
static <M extends MaskedFlag> int mask(
final boolean onlyPropagatedToLmdb, final Stream<M> flags) {
final Predicate<M> filter = onlyPropagatedToLmdb ? MaskedFlag::isPropagatedToLmdb : f -> true;
return flags == null
? 0
: flags
.filter(Objects::nonNull)
.filter(filter)
.map(M::getMask)
.reduce(0, (f1, f2) -> f1 | f2);
}
/**
* Indicates whether the passed flag has the relevant masked flag high.
*
* @param flags to evaluate (usually produced by {@link #mask(org.lmdbjava.MaskedFlag...)}
* @param test the flag being sought (required)
* @return true if set.
*/
static boolean isSet(final int flags, final MaskedFlag test) {
requireNonNull(test);
return (flags & test.getMask()) == test.getMask();
}
}