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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 org.lmdbjava.Library.LIB;
import jnr.ffi.byref.IntByReference;
/** LMDB metadata functions. */
public final class Meta {
private Meta() {}
/**
* Fetches the LMDB error code description.
*
* <p>End users should not need this method, as LmdbJava converts all LMDB exceptions into a typed
* Java exception that incorporates the error code. However it is provided here for verification
* and troubleshooting (eg if the user wishes to see the original LMDB description of the error
* code, or there is a newer library version etc).
*
* @param err the error code returned from LMDB
* @return the description
*/
public static String error(final int err) {
return LIB.mdb_strerror(err);
}
/**
* Obtains the LMDB C library version information.
*
* @return the version data
*/
public static Version version() {
final IntByReference major = new IntByReference();
final IntByReference minor = new IntByReference();
final IntByReference patch = new IntByReference();
LIB.mdb_version(major, minor, patch);
return new Version(major.intValue(), minor.intValue(), patch.intValue());
}
/** Immutable return value from {@link #version()}. */
public static final class Version {
/** LMDC native library major version number. */
public final int major;
/** LMDC native library patch version number. */
public final int minor;
/** LMDC native library patch version number. */
public final int patch;
Version(final int major, final int minor, final int patch) {
this.major = major;
this.minor = minor;
this.patch = patch;
}
}
}