1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.commons.functor.core.composite;
18  
19  import static org.junit.Assert.assertEquals;
20  
21  import org.apache.commons.functor.BaseFunctorTest;
22  import org.apache.commons.functor.UnaryFunction;
23  import org.apache.commons.functor.core.Constant;
24  import org.junit.Test;
25  
26  /**
27   * @version $Revision: 1171255 $ $Date: 2011-09-15 22:27:39 +0200 (Thu, 15 Sep 2011) $
28   * @author Rodney Waldhoff
29   */
30  public class TestCompositeUnaryFunction extends BaseFunctorTest {
31  
32      // Functor Testing Framework
33      // ------------------------------------------------------------------------
34  
35      protected Object makeFunctor() {
36          return Composite.function(Constant.of(3));
37      }
38  
39      // Tests
40      // ------------------------------------------------------------------------
41  
42      @Test
43      public void testEvaluate() throws Exception {
44  
45          assertEquals(new Integer(4),(new CompositeUnaryFunction<Object, Integer>(Constant.of(4))).evaluate(null));
46  
47          assertEquals(new Integer(4),(Composite.function(Constant.of(4)).of(Constant.of(3)).evaluate("xyzzy")));
48          assertEquals(new Integer(3),(new CompositeUnaryFunction<Object, Integer>(Constant.of(3)).of(Constant.of(4)).evaluate("xyzzy")));
49      }
50  
51      @Test
52      public void testOf() throws Exception {
53          UnaryFunction<Object, Integer> uf = new UnaryFunction<Object, Integer>() {
54              public Integer evaluate(Object obj) {
55                  if (obj instanceof Integer) {
56                      return (((Integer) obj).intValue()) + 1;
57                  } else {
58                      return 1;
59                  }
60              }
61          };
62          CompositeUnaryFunction<Object, Integer> f = null;
63          for (int i = 0; i < 10; i++) {
64              f = f == null ? new CompositeUnaryFunction<Object, Integer>(uf) : f.of(uf);
65              assertEquals(Integer.valueOf(i+1),f.evaluate(null));
66          }
67      }
68  
69      @Test
70      public void testEquals() throws Exception {
71          CompositeUnaryFunction<Object, String> f = new CompositeUnaryFunction<Object, String>(Constant.of("x"));
72          assertEquals(f,f);
73          
74          CompositeUnaryFunction<Object, String> g = new CompositeUnaryFunction<Object, String>(Constant.of("x"));
75          assertObjectsAreEqual(f,g);
76  
77          for (int i=0;i<3;i++) {
78              f = f.of(Constant.of("y")).of(Constant.of("z"));
79              assertObjectsAreNotEqual(f,g);
80              g = g.of(Constant.of("y")).of(Constant.of("z"));
81              assertObjectsAreEqual(f,g);
82          }
83  
84          assertObjectsAreNotEqual(f, Constant.of("y"));
85      }
86  
87  }