ScalaInJavaHelper.java

/*
 * Copyright 2014 DataGenerator Contributors
 *
 * 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.finra.datagenerator.common.Helpers;

import scala.collection.JavaConverters;

import java.util.LinkedList;

/**
 * org.finra.datagenerator.common.Helpers to use Scala code in Java.
 */
public final class ScalaInJavaHelper {
    private ScalaInJavaHelper() {
        // Not called -- utility class
    }

    /**
     * Convert a Java LinkedList to a Scala Iterable.
     * @param linkedList Java LinkedList to convert
     * @return Scala Iterable
     */
    public static scala.collection.Iterable linkedListToScalaIterable(LinkedList<?> linkedList) {
        return JavaConverters.asScalaIterableConverter(linkedList).asScala();
    }

    /**
     * Flattens an option into its value or else null, which is not great but is usually more convenient in Java.
     * @param option Optional value -- either Some(T) or None
     * @param <T> Any type
     * @return The value inside the option, or else null
     */
    public static <T> T flattenOption(scala.Option<T> option) {
        if (option.isEmpty()) {
            return null;
        } else {
            return option.get();
        }
    }
}