    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 java.io.Serializable;
    020
    021import org.apache.commons.collections4.Predicate;
    022
    023/**
    024 * Predicate implementation that returns true if both the predicates return true.
    025 *
    026 * @since 3.0
    027 */
    028public final class AndPredicate<T> implements PredicateDecorator<T>, Serializable {
    029
    030    /** Serial version UID */
    031    private static final long serialVersionUID = 4189014213763186912L;
    032
    033    /** The array of predicates to call */
    034    private final Predicate<? super T> iPredicate1;
    035    /** The array of predicates to call */
    036    private final Predicate<? super T> iPredicate2;
    037
    038    /**
    039     * Factory to create the predicate.
    040     *
    041     * @param <T> the type that the predicate queries
    042     * @param predicate1  the first predicate to check, not null
    043     * @param predicate2  the second predicate to check, not null
    044     * @return the <code>and</code> predicate
    045     * @throws NullPointerException if either predicate is null
    046     */
    047    public static <T> Predicate<T> andPredicate(final Predicate<? super T> predicate1,
    048                                                final Predicate<? super T> predicate2) {
    049        if (predicate1 == null || predicate2 == null) {
    050            throw new NullPointerException("Predicate must not be null");
    051        }
    052        return new AndPredicate<>(predicate1, predicate2);
    053    }
    054
    055    /**
    056     * Constructor that performs no validation.
    057     * Use <code>andPredicate</code> if you want that.
    058     *
    059     * @param predicate1  the first predicate to check, not null
    060     * @param predicate2  the second predicate to check, not null
    061     */
    062    public AndPredicate(final Predicate<? super T> predicate1, final Predicate<? super T> predicate2) {
    063        super();
    064        iPredicate1 = predicate1;
    065        iPredicate2 = predicate2;
    066    }
    067
    068    /**
    069     * Evaluates the predicate returning true if both predicates return true.
    070     *
    071     * @param object  the input object
    072     * @return true if both decorated predicates return true
    073     */
    074    @Override
    075    public boolean evaluate(final T object) {
    076       return iPredicate1.evaluate(object) && iPredicate2.evaluate(object);
    077    }
    078
    079    /**
    080     * Gets the two predicates being decorated as an array.
    081     *
    082     * @return the predicates
    083     * @since 3.1
    084     */
    085    @Override
    086    @SuppressWarnings("unchecked")
    087    public Predicate<? super T>[] getPredicates() {
    088        return new Predicate[] {iPredicate1, iPredicate2};
    089    }
    090
    091}