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
018 package org.apache.commons.proxy.invoker;
019
020 import junit.framework.TestCase;
021 import org.apache.commons.proxy.ObjectProvider;
022 import org.apache.commons.proxy.ProxyFactory;
023 import org.apache.commons.proxy.provider.ConstantProvider;
024
025 import java.io.Serializable;
026
027 /**
028 *
029 */
030 public class TestDuckTypingInvoker extends TestCase
031 {
032 //----------------------------------------------------------------------------------------------------------------------
033 // Other Methods
034 //----------------------------------------------------------------------------------------------------------------------
035
036 public void testExactSignatureMatch()
037 {
038 final ObjectProvider targetProvider = new ConstantProvider( new LegacyDuck() );
039 final DuckTypingInvoker invoker = new DuckTypingInvoker( targetProvider );
040 final Duck duck = ( Duck ) new ProxyFactory().createInvokerProxy( invoker, new Class[]{ Duck.class } );
041 assertEquals( "Quack!", duck.sayQuack() );
042 }
043
044 public void testNoMatchingMethod()
045 {
046 final ObjectProvider targetProvider = new ConstantProvider( new LegacyDuck() );
047 final DuckTypingInvoker invoker = new DuckTypingInvoker( targetProvider );
048 final Goose goose = ( Goose ) new ProxyFactory().createInvokerProxy( invoker, new Class[]{ Goose.class } );
049 try
050 {
051 goose.sayHonk();
052 fail( "No matching method should be found." );
053 }
054 catch ( UnsupportedOperationException e )
055 {
056 // Do nothing, expected behavior!
057 }
058 }
059
060 public void testMismatchingParameterType()
061 {
062 final ObjectProvider targetProvider = new ConstantProvider( new LegacyDuck() );
063 final DuckTypingInvoker invoker = new DuckTypingInvoker( targetProvider );
064 final ParameterizedDuck parameterizedDuck = ( ParameterizedDuck ) new ProxyFactory()
065 .createInvokerProxy( invoker, new Class[]{ ParameterizedDuck.class } );
066 try
067 {
068 parameterizedDuck.sayQuack("Elmer");
069 fail( "No matching method should be found." );
070 }
071 catch ( UnsupportedOperationException e )
072 {
073 // Do nothing, expected behavior!
074 }
075 }
076
077 public void testTargetHasCompatibleReturnType()
078 {
079 final ObjectProvider targetProvider = new ConstantProvider( new LegacyDuck() );
080 final DuckTypingInvoker invoker = new DuckTypingInvoker( targetProvider );
081 final SerializableDuck duck = ( SerializableDuck ) new ProxyFactory().createInvokerProxy( invoker, new Class[]{
082 SerializableDuck.class } );
083 assertEquals("Quack!", duck.sayQuack() );
084
085 }
086
087 public void testMismatchingReturnType()
088 {
089 final ObjectProvider targetProvider = new ConstantProvider( new LegacyDuck() );
090 final DuckTypingInvoker invoker = new DuckTypingInvoker( targetProvider );
091 final VoidReturnDuck voidDuck = ( VoidReturnDuck ) new ProxyFactory().createInvokerProxy( invoker, new Class[]{
092 VoidReturnDuck.class } );
093 try
094 {
095 voidDuck.sayQuack();
096 fail( "No matching method should be found." );
097 }
098 catch ( UnsupportedOperationException e )
099 {
100 // Do nothing, expected behavior!
101 }
102 }
103
104 //----------------------------------------------------------------------------------------------------------------------
105 // Inner Classes
106 //----------------------------------------------------------------------------------------------------------------------
107
108 public static class LegacyDuck
109 {
110 public String sayQuack()
111 {
112 return "Quack!";
113 }
114 }
115
116 public interface Duck
117 {
118 public String sayQuack();
119 }
120
121 public interface SerializableDuck
122 {
123 public Serializable sayQuack();
124 }
125
126 public interface ParameterizedDuck
127 {
128 public String sayQuack( String recipient );
129 }
130
131 public interface VoidReturnDuck
132 {
133 public void sayQuack();
134 }
135
136 public interface Goose
137 {
138 public void sayHonk();
139 }
140 }