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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.jackrabbit.oak;

import org.jetbrains.annotations.NotNull;

/**
 * Provides version information about Oak.
 */
public final class OakVersion {

    private static String version = null;

    private OakVersion() {
    }

    /**
     * Returns the version of oak-core.
     * 
     * @return the version (or "SNAPSHOT" when unknown)
     */
    @NotNull
    public synchronized static String getVersion() {
        if (version == null) {
            version = org.apache.jackrabbit.oak.commons.OakVersion.getVersion(
                    "oak-core", OakVersion.class);
        }
        return version;
    }
}