/*- * #%L * LmdbJava * %% * Copyright (C) 2016 - 2018 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. * #L% */ package org.lmdbjava; import jnr.ffi.byref.IntByReference; import static org.lmdbjava.Library.LIB; /** * LMDB metadata functions. */ public final class Meta { private Meta() { } /** * Fetches the LMDB error code description. * *

* 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; } } }