/*

* 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;

}

}

}