    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.lang3.function;
    019
    020import java.util.Objects;
    021import java.util.function.IntPredicate;
    022
    023/**
    024 * A functional interface like {@link IntPredicate} that declares a {@code Throwable}.
    025 *
    026 * @param <E> Thrown exception.
    027 * @since 3.11
    028 */
    029@FunctionalInterface
    030public interface FailableIntPredicate<E extends Throwable> {
    031
    032    /** FALSE singleton */
    033    @SuppressWarnings("rawtypes")
    034    FailableIntPredicate FALSE = t -> false;
    035
    036    /** TRUE singleton */
    037    @SuppressWarnings("rawtypes")
    038    FailableIntPredicate TRUE = t -> true;
    039
    040    /**
    041     * Returns The FALSE singleton.
    042     *
    043     * @param <E> Thrown exception.
    044     * @return The NOP singleton.
    045     */
    046    static <E extends Throwable> FailableIntPredicate<E> falsePredicate() {
    047        return FALSE;
    048    }
    049
    050    /**
    051     * Returns The FALSE TRUE.
    052     *
    053     * @param <E> Thrown exception.
    054     * @return The NOP singleton.
    055     */
    056    static <E extends Throwable> FailableIntPredicate<E> truePredicate() {
    057        return TRUE;
    058    }
    059
    060    /**
    061     * Returns a composed {@code FailableIntPredicate} like {@link IntPredicate#and(IntPredicate)}.
    062     *
    063     * @param other a predicate that will be logically-ANDed with this predicate.
    064     * @return a composed {@code FailableIntPredicate} like {@link IntPredicate#and(IntPredicate)}.
    065     * @throws NullPointerException if other is null
    066     */
    067    default FailableIntPredicate<E> and(final FailableIntPredicate<E> other) {
    068        Objects.requireNonNull(other);
    069        return t -> test(t) && other.test(t);
    070    }
    071
    072    /**
    073     * Returns a predicate that negates this predicate.
    074     *
    075     * @return a predicate that negates this predicate.
    076     */
    077    default FailableIntPredicate<E> negate() {
    078        return t -> !test(t);
    079    }
    080
    081    /**
    082     * Returns a composed {@code FailableIntPredicate} like {@link IntPredicate#and(IntPredicate)}.
    083     *
    084     * @param other a predicate that will be logically-ORed with this predicate.
    085     * @return a composed {@code FailableIntPredicate} like {@link IntPredicate#and(IntPredicate)}.
    086     * @throws NullPointerException if other is null
    087     */
    088    default FailableIntPredicate<E> or(final FailableIntPredicate<E> other) {
    089        Objects.requireNonNull(other);
    090        return t -> test(t) || other.test(t);
    091    }
    092
    093    /**
    094     * Tests the predicate.
    095     *
    096     * @param value the parameter for the predicate to accept.
    097     * @return {@code true} if the input argument matches the predicate, {@code false} otherwise.
    098     * @throws E Thrown when the consumer fails.
    099     */
    100    boolean test(int value) throws E;
    101}