Function.java

/*
 * Copyright (c) OSGi Alliance 2015. All Rights Reserved.
 *
 * 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.osgi.util.function;

/**
 * A function that accepts a single argument and produces a result.
 * <p>
 * This is a functional interface and can be used as the assignment target for a lambda expression or method reference.
 *
 * @param <T> The type of the function input.
 * @param <R> The type of the function output.
 */
@org.osgi.annotation.versioning.ConsumerType
public interface Function<T, R> {

    /**
     * Applies this function to the specified argument.
     * @param t The input to this function.
     * @return The output of this function.
     * @throws An Exception
     */
    R apply(T t) throws Exception;
}