001 /*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017 package org.apache.commons.functor.core.composite;
018
019 import static org.junit.Assert.assertFalse;
020 import static org.junit.Assert.assertTrue;
021
022 import java.util.LinkedList;
023 import java.util.List;
024
025 import org.apache.commons.functor.BaseFunctorTest;
026 import org.apache.commons.functor.Predicate;
027 import org.apache.commons.functor.Procedure;
028 import org.apache.commons.functor.adapter.BoundPredicate;
029 import org.apache.commons.functor.core.Constant;
030 import org.apache.commons.functor.core.NoOp;
031 import org.apache.commons.functor.core.collection.IsEmpty;
032 import org.junit.Test;
033
034 /**
035 * @version $Revision: 1171255 $ $Date: 2011-09-15 22:27:39 +0200 (Thu, 15 Sep 2011) $
036 * @author Herve Quiroz
037 */
038 public class TestDoWhileProcedure extends BaseFunctorTest {
039
040 // Functor Testing Framework
041 // ------------------------------------------------------------------------
042
043 protected Object makeFunctor() {
044 return new DoWhileProcedure(NoOp.INSTANCE, Constant.FALSE);
045 }
046
047 // Tests
048 // ------------------------------------------------------------------------
049 public class ListRemoveFirstProcedure implements Procedure {
050 protected List<Object> list;
051
052
053 public ListRemoveFirstProcedure(List<Object> list) {
054 this.list=list;
055 }
056
057
058 public void run() {
059 list.remove(0);
060 }
061 }
062
063
064 private List<Object> getList() {
065 List<Object> list = new LinkedList<Object>();
066 list.add("a");
067 list.add("b");
068 list.add("c");
069 list.add("d");
070 return list;
071 }
072
073
074 @Test
075 public void testLoopWithAction() throws Exception {
076 List<Object> list=getList();
077
078 Procedure action=new ListRemoveFirstProcedure(list);
079 Predicate condition=new Not(new BoundPredicate(new IsEmpty<List<Object>>(), list));
080 Procedure procedure=new DoWhileProcedure(action, condition);
081
082 assertTrue("The condition should be true before running the loop", condition.test());
083 assertFalse("The list should not be empty then", list.isEmpty());
084 procedure.run();
085 assertFalse("The condition should be false after running the loop", condition.test());
086 assertTrue("The list should be empty then", list.isEmpty());
087
088 list=getList();
089 action=new ListRemoveFirstProcedure(list);
090 condition=new Predicate() {
091 private int count=2;
092
093 public boolean test() {
094 return count-- > 0;
095 }
096 };
097 procedure=new DoWhileProcedure(action, condition);
098 procedure.run();
099 assertFalse("The list should not contain \"a\" anymore", list.contains("a"));
100 assertFalse("The list should not contain \"b\" anymore", list.contains("b"));
101 assertFalse("The list should not contain \"c\" anymore", list.contains("c"));
102 assertTrue("The list should still contain \"d\"", list.contains("d"));
103 }
104
105 @Test
106 public void testLoopForNothing() {
107 List<Object> list=getList();
108 Procedure action=new ListRemoveFirstProcedure(list);
109 Procedure procedure=new DoWhileProcedure(action, Constant.FALSE);
110 assertTrue("The list should contain 4 elements before runnning the loop", list.size()==4);
111 procedure.run();
112 assertTrue("The list should contain 3 elements after runnning the loop", list.size()==3);
113 }
114 }