distributedlog-core/src/main/java/org/apache/distributedlog/function/GetVersionedValueFunction.java

/**
 * 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.distributedlog.function;

import org.apache.distributedlog.LogSegmentMetadata;
import org.apache.bookkeeper.versioning.Versioned;
import scala.Function1;
import scala.runtime.AbstractFunction1;

import java.util.List;

/**
 * Function to get the versioned value from {@link org.apache.bookkeeper.versioning.Versioned}
 */
public class GetVersionedValueFunction<T> extends AbstractFunction1<Versioned<T>, T> {

    public static final Function1<Versioned<List<LogSegmentMetadata>>, List<LogSegmentMetadata>>
            GET_LOGSEGMENT_LIST_FUNC = new GetVersionedValueFunction<List<LogSegmentMetadata>>();

    @Override
    public T apply(Versioned<T> versionedValue) {
        return versionedValue.getValue();
    }
}