001 /*
002 * Created on Feb 6, 2011
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
005 * the License. You may obtain a copy of the License at
006 *
007 * http://www.apache.org/licenses/LICENSE-2.0
008 *
009 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
010 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
011 * specific language governing permissions and limitations under the License.
012 *
013 * Copyright @2011 the original author or authors.
014 */
015 package org.fest.assertions.condition;
016
017 import static java.util.Collections.unmodifiableCollection;
018
019 import java.util.*;
020
021 import org.fest.assertions.core.Condition;
022 import org.fest.util.VisibleForTesting;
023
024 /**
025 * Join of two or more <code>{@link Condition}</code>s.
026 * @param <T> the type of object this condition accepts.
027 *
028 * @author Yvonne Wang
029 * @author Mikhail Mazursky
030 */
031 public abstract class Join<T> extends Condition<T> {
032
033 @VisibleForTesting final Collection<Condition<? super T>> conditions;
034
035 /**
036 * Creates a new </code>{@link Join}</code>.
037 * @param conditions the conditions to join.
038 * @throws NullPointerException if the given array is {@code null}.
039 * @throws NullPointerException if any of the elements in the given array is {@code null}.
040 */
041 protected Join(Condition<? super T>...conditions) {
042 if (conditions == null) throw conditionsIsNull();
043 this.conditions = new ArrayList<Condition<? super T>>();
044 for (Condition<? super T> condition : conditions) this.conditions.add(notNull(condition));
045 }
046
047 /**
048 * Creates a new </code>{@link Join}</code>.
049 * @param conditions the conditions to join.
050 * @throws NullPointerException if the given iterable is {@code null}.
051 * @throws NullPointerException if any of the elements in the given iterable is {@code null}.
052 */
053 protected Join(Iterable<? extends Condition<? super T>> conditions) {
054 if (conditions == null) throw conditionsIsNull();
055 this.conditions = new ArrayList<Condition<? super T>>();
056 for (Condition<? super T> condition : conditions) this.conditions.add(notNull(condition));
057 }
058
059 private static NullPointerException conditionsIsNull() {
060 return new NullPointerException("The given conditions should not be null");
061 }
062
063 private static <T> Condition<T> notNull(Condition<T> condition) {
064 if (condition == null) throw new NullPointerException("The given conditions should not have null entries");
065 return condition;
066 }
067
068 /**
069 * Returns the conditions to join.
070 * @return the conditions to join.
071 */
072 protected final Collection<Condition<? super T>> conditions() {
073 return unmodifiableCollection(conditions);
074 }
075 }