1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 package org.apache.commons.io.function; 19 20 import java.io.IOException; 21 import java.io.UncheckedIOException; 22 import java.util.Comparator; 23 24 /** 25 * Like {@link Comparator} but throws {@link IOException}. 26 * 27 * @param <T> the type of objects that may be compared by this comparator 28 * 29 * @see Comparator 30 * @since 2.12.0 31 */ 32 @FunctionalInterface 33 public interface IOComparator<T> { 34 35 /** 36 * Creates a {@link Comparator} for this instance that throws {@link UncheckedIOException} instead of 37 * {@link IOException}. 38 * 39 * @return an UncheckedIOException BiFunction. 40 */ 41 default Comparator<T> asComparator() { 42 return (t, u) -> Uncheck.compare(this, t, u); 43 } 44 45 /** 46 * Like {@link Comparator#compare(Object, Object)} but throws {@link IOException}. 47 * 48 * @param o1 the first object to be compared. 49 * @param o2 the second object to be compared. 50 * @return a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than 51 * the second. 52 * @throws NullPointerException if an argument is null and this comparator does not permit null arguments 53 * @throws ClassCastException if the arguments' types prevent them from being compared by this comparator. 54 * @throws IOException if an I/O error occurs. 55 */ 56 int compare(T o1, T o2) throws IOException; 57 }