001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.juneau.utils;
018
019import static org.apache.juneau.common.utils.ThrowableUtils.*;
020
021import java.util.function.*;
022
023/**
024 * A subclass of {@link Function} that allows for thrown exceptions.
025 *
026 * <h5 class='section'>See Also:</h5><ul>
027 * </ul>
028 *
029 * @param <T> the type of the input to the function.
030 * @param <R> the type of the result of the function.
031 */
032@FunctionalInterface
033public interface ThrowingFunction<T,R> extends Function<T,R> {
034
035   @Override
036   default R apply(T t) {
037      try {
038         return applyThrows(t);
039      } catch (Exception e) {
040         throw asRuntimeException(e);
041      }
042   }
043
044   /**
045    * The functional method to implement.
046    *
047    * @param t The type of the input to the function.
048    * @return The type of the result of the function.
049    * @throws Exception Any exception.
050    */
051   R applyThrows(T t) throws Exception;
052}