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 */
030 public abstract class Join<T> extends Condition<T> {
031
032 @VisibleForTesting final Collection<Condition<T>> conditions;
033
034 /**
035 * Creates a new </code>{@link Join}</code>.
036 * @param conditions the conditions to join.
037 * @throws NullPointerException if the given array is {@code null}.
038 * @throws NullPointerException if any of the elements in the given array is {@code null}.
039 */
040 protected Join(Condition<T>...conditions) {
041 this.conditions = listWithoutNulls(conditions);
042 }
043
044 private static <T> List<Condition<T>> listWithoutNulls(Condition<T>...conditions) {
045 if (conditions == null) throw conditionsIsNull();
046 List<Condition<T>> list = new ArrayList<Condition<T>>();
047 for (Condition<T> condition : conditions) list.add(notNull(condition));
048 return list;
049 }
050
051 /**
052 * Creates a new </code>{@link Join}</code>.
053 * @param conditions the conditions to join.
054 * @throws NullPointerException if the given collection is {@code null}.
055 * @throws NullPointerException if any of the elements in the given collection is {@code null}.
056 */
057 protected Join(Collection<Condition<T>> conditions) {
058 this.conditions = listWithoutNulls(conditions);
059 }
060
061 private static <T> List<Condition<T>> listWithoutNulls(Collection<Condition<T>> conditions) {
062 if (conditions == null) throw conditionsIsNull();
063 List<Condition<T>> list = new ArrayList<Condition<T>>();
064 for (Condition<T> condition : conditions) list.add(notNull(condition));
065 return list;
066 }
067
068 private static NullPointerException conditionsIsNull() {
069 return new NullPointerException("The given conditions should not be null");
070 }
071
072 private static <T> Condition<T> notNull(Condition<T> condition) {
073 if (condition == null) throw new NullPointerException("The given conditions should not have null entries");
074 return condition;
075 }
076
077 /**
078 * Returns the conditions to join.
079 * @return the conditions to join.
080 */
081 protected final Collection<Condition<T>> conditions() {
082 return unmodifiableCollection(conditions);
083 }
084 }