OrPredicate.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.commons.collections4.functors;

import java.io.Serializable;
import java.util.Objects;

import org.apache.commons.collections4.Predicate;

/**
 * Predicate implementation that returns true if either of the predicates return true.
 *
 * @param <T> the type of the input to the predicate.
 * @since 3.0
 */
public final class OrPredicate<T> extends AbstractPredicate<T> implements PredicateDecorator<T>, Serializable {

    /** Serial version UID */
    private static final long serialVersionUID = -8791518325735182855L;

    /**
     * Creates the predicate.
     *
     * @param <T> the type that the predicate queries
     * @param predicate1  the first predicate to check, not null
     * @param predicate2  the second predicate to check, not null
     * @return the {@code and} predicate
     * @throws NullPointerException if either predicate is null
     */
    public static <T> Predicate<T> orPredicate(final Predicate<? super T> predicate1,
                                               final Predicate<? super T> predicate2) {
        return new OrPredicate<>(Objects.requireNonNull(predicate1, "predicate1"),
                Objects.requireNonNull(predicate2, "predicate2"));
    }
    /** The array of predicates to call */
    private final Predicate<? super T> iPredicate1;

    /** The array of predicates to call */
    private final Predicate<? super T> iPredicate2;

    /**
     * Constructor that performs no validation.
     * Use {@code orPredicate} if you want that.
     *
     * @param predicate1  the first predicate to check, not null
     * @param predicate2  the second predicate to check, not null
     */
    public OrPredicate(final Predicate<? super T> predicate1, final Predicate<? super T> predicate2) {
        iPredicate1 = predicate1;
        iPredicate2 = predicate2;
    }

    /**
     * Gets the two predicates being decorated as an array.
     *
     * @return the predicates
     * @since 3.1
     */
    @Override
    @SuppressWarnings("unchecked")
    public Predicate<? super T>[] getPredicates() {
        return new Predicate[] {iPredicate1, iPredicate2};
    }

    /**
     * Evaluates the predicate returning true if either predicate returns true.
     *
     * @param object  the input object
     * @return true if either decorated predicate returns true
     */
    @Override
    public boolean test(final T object) {
        return iPredicate1.test(object) || iPredicate2.test(object);
    }

}