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 }