    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.commons.collections4.functors;
    018
    019import static org.apache.commons.collections4.functors.FunctorUtils.coerce;
    020import static org.apache.commons.collections4.functors.FunctorUtils.validate;
    021import static org.apache.commons.collections4.functors.TruePredicate.truePredicate;
    022
    023import java.util.Collection;
    024
    025import org.apache.commons.collections4.Predicate;
    026
    027/**
    028 * Predicate implementation that returns true if all the
    029 * predicates return true.
    030 * If the array of predicates is empty, then this predicate returns true.
    031 * <p>
    032 * NOTE: In versions prior to 3.2 an array size of zero or one
    033 * threw an exception.
    034 *
    035 * @since 3.0
    036 */
    037public final class AllPredicate<T> extends AbstractQuantifierPredicate<T> {
    038
    039    /** Serial version UID */
    040    private static final long serialVersionUID = -3094696765038308799L;
    041
    042    /**
    043     * Factory to create the predicate.
    044     * <p>
    045     * If the array is size zero, the predicate always returns true.
    046     * If the array is size one, then that predicate is returned.
    047     *
    048     * @param <T> the type that the predicate queries
    049     * @param predicates  the predicates to check, cloned, not null
    050     * @return the <code>all</code> predicate
    051     * @throws NullPointerException if the predicates array is null
    052     * @throws NullPointerException if any predicate in the array is null
    053     */
    054    public static <T> Predicate<T> allPredicate(final Predicate<? super T>... predicates) {
    055        FunctorUtils.validate(predicates);
    056        if (predicates.length == 0) {
    057            return truePredicate();
    058        }
    059        if (predicates.length == 1) {
    060            return coerce(predicates[0]);
    061        }
    062
    063        return new AllPredicate<>(FunctorUtils.copy(predicates));
    064    }
    065
    066    /**
    067     * Factory to create the predicate.
    068     * <p>
    069     * If the collection is size zero, the predicate always returns true.
    070     * If the collection is size one, then that predicate is returned.
    071     *
    072     * @param <T> the type that the predicate queries
    073     * @param predicates  the predicates to check, cloned, not null
    074     * @return the <code>all</code> predicate
    075     * @throws NullPointerException if the predicates array is null
    076     * @throws NullPointerException if any predicate in the array is null
    077     */
    078    public static <T> Predicate<T> allPredicate(final Collection<? extends Predicate<? super T>> predicates) {
    079        final Predicate<? super T>[] preds = validate(predicates);
    080        if (preds.length == 0) {
    081            return truePredicate();
    082        }
    083        if (preds.length == 1) {
    084            return coerce(preds[0]);
    085        }
    086        return new AllPredicate<>(preds);
    087    }
    088
    089    /**
    090     * Constructor that performs no validation.
    091     * Use <code>allPredicate</code> if you want that.
    092     *
    093     * @param predicates  the predicates to check, not cloned, not null
    094     */
    095    public AllPredicate(final Predicate<? super T>... predicates) {
    096        super(predicates);
    097    }
    098
    099    /**
    100     * Evaluates the predicate returning true if all predicates return true.
    101     *
    102     * @param object  the input object
    103     * @return true if all decorated predicates return true
    104     */
    105    @Override
    106    public boolean evaluate(final T object) {
    107        for (final Predicate<? super T> iPredicate : iPredicates) {
    108            if (!iPredicate.evaluate(object)) {
    109                return false;
    110            }
    111        }
    112        return true;
    113    }
    114
    115}