org.jooq.lambda.function.Function0 Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of jool Show documentation

jOOλ is part of the jOOQ series (along with jOOQ, jOOX, jOOR, jOOU) providing some useful extensions to Java 8 lambdas.

There is a newer version: 0.9.15

/**
 * Copyright (c) 2014, Data Geekery GmbH, [email protected]
 *
 * 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.jooq.lambda.function;

import java.util.function.Function;
import java.util.function.Supplier;

/**
 * A function with 0 arguments
 *
 * @author Lukas Eder
 */
@FunctionalInterface
public interface Function0 extends Supplier {

    /**
     * Apply this function to the arguments.
     */
    default R apply() {
        return get();
    }

    /**
     * Apply this function to the arguments.
     */
    @Override
    R get();

    /**
     * Convert this function to a {@link java.util.function.Supplier}
     */
    default Supplier toSupplier() {
        return () -> apply();
    }

    /**
     * Convert to this function from a {@link java.util.function.Supplier}
     */
    static  Function0 from(Supplier supplier) {
        return () -> supplier.get();
    }
    
}