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/*
 * 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.util.Collection;

import org.apache.commons.collections4.Predicate;

/**
 * Predicate implementation that returns true if only one of the
 * predicates return true.
 * If the array of predicates is empty, then this predicate returns false.
 * 

* NOTE: In versions prior to 3.2 an array size of zero or one * threw an exception. * * @since 3.0 * @version $Id: OnePredicate.java 1686855 2015-06-22 13:00:27Z tn $ */ public final class OnePredicate extends AbstractQuantifierPredicate { /** Serial version UID */ private static final long serialVersionUID = -8125389089924745785L; /** * Factory to create the predicate. *

* If the array is size zero, the predicate always returns false. * If the array is size one, then that predicate is returned. * * @param the type that the predicate queries * @param predicates the predicates to check, cloned, not null * @return the any predicate * @throws NullPointerException if the predicates array is null * @throws NullPointerException if any predicate in the array is null */ @SuppressWarnings("unchecked") public static Predicate onePredicate(final Predicate... predicates) { FunctorUtils.validate(predicates); if (predicates.length == 0) { return FalsePredicate.falsePredicate(); } if (predicates.length == 1) { return (Predicate) predicates[0]; } return new OnePredicate(FunctorUtils.copy(predicates)); } /** * Factory to create the predicate. * * @param the type that the predicate queries * @param predicates the predicates to check, cloned, not null * @return the one predicate * @throws NullPointerException if the predicates array is null * @throws NullPointerException if any predicate in the array is null */ public static Predicate onePredicate(final Collection> predicates) { final Predicate[] preds = FunctorUtils.validate(predicates); return new OnePredicate(preds); } /** * Constructor that performs no validation. * Use onePredicate if you want that. * * @param predicates the predicates to check, not cloned, not null */ public OnePredicate(final Predicate... predicates) { super(predicates); } /** * Evaluates the predicate returning true if only one decorated predicate * returns true. * * @param object the input object * @return true if only one decorated predicate returns true */ public boolean evaluate(final T object) { boolean match = false; for (final Predicate iPredicate : iPredicates) { if (iPredicate.evaluate(object)) { if (match) { return false; } match = true; } } return match; } }





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