    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 */
    017
    018package org.apache.commons.io.function;
    019
    020import java.io.IOException;
    021import java.io.UncheckedIOException;
    022import java.util.Comparator;
    023
    024/**
    025 * Like {@link Comparator} but throws {@link IOException}.
    026 *
    027 * @param <T> the type of objects that may be compared by this comparator
    028 *
    029 * @see Comparator
    030 * @since 2.12.0
    031 */
    032@FunctionalInterface
    033public interface IOComparator<T> {
    034
    035    /**
    036     * Creates a {@link Comparator} for this instance that throws {@link UncheckedIOException} instead of
    037     * {@link IOException}.
    038     *
    039     * @return an UncheckedIOException BiFunction.
    040     */
    041    default Comparator<T> asComparator() {
    042        return (t, u) -> Uncheck.compare(this, t, u);
    043    }
    044
    045    /**
    046     * Like {@link Comparator#compare(Object, Object)} but throws {@link IOException}.
    047     *
    048     * @param o1 the first object to be compared.
    049     * @param o2 the second object to be compared.
    050     * @return a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than
    051     *         the second.
    052     * @throws NullPointerException if an argument is null and this comparator does not permit null arguments
    053     * @throws ClassCastException if the arguments' types prevent them from being compared by this comparator.
    054     * @throws IOException if an I/O error occurs.
    055     */
    056    int compare(T o1, T o2) throws IOException;
    057}