cassandra-analytics-core/src/main/java/org/apache/cassandra/spark/utils/ScalaFunctions.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.cassandra.spark.utils;

import scala.Function0;
import scala.runtime.AbstractFunction0;
import scala.runtime.BoxedUnit;

public final class ScalaFunctions
{
    private ScalaFunctions()
    {
        throw new IllegalStateException(getClass() + " is static utility class and shall not be instantiated");
    }

    public static Function0<BoxedUnit> wrapLambda(Runnable funcToWrap)
    {
        return new Function0Wrapper(funcToWrap);
    }

    public static class Function0Wrapper extends AbstractFunction0<BoxedUnit>
    {
        private final Runnable funcToWrap;

        public Function0Wrapper(Runnable funcToWrap)
        {
            this.funcToWrap = funcToWrap;
        }

        public BoxedUnit apply()
        {
            funcToWrap.run();
            return BoxedUnit.UNIT;
        }
    }
}