svn commit: r1000559 - in /commons/proper/proxy/branches/version-2.0-work/stub/src: main/java/org/apache/commons/proxy2/stub/StubInterceptor.java test/java/org/apache/commons/proxy2/stub/AbstractStubProxyFactoryTest.java

[mbenson]

Author: mbenson
Date: Thu Sep 23 18:03:09 2010
New Revision: 1000559

URL: http://svn.apache.org/viewvc?rev=1000559&view=rev
Log:
bail early if bad return values are specified while stubbing

Modified:
    
commons/proper/proxy/branches/version-2.0-work/stub/src/main/java/org/apache/commons/proxy2/stub/StubInterceptor.java
    
commons/proper/proxy/branches/version-2.0-work/stub/src/test/java/org/apache/commons/proxy2/stub/AbstractStubProxyFactoryTest.java

Modified: 
commons/proper/proxy/branches/version-2.0-work/stub/src/main/java/org/apache/commons/proxy2/stub/StubInterceptor.java
URL: 
http://svn.apache.org/viewvc/commons/proper/proxy/branches/version-2.0-work/stub/src/main/java/org/apache/commons/proxy2/stub/StubInterceptor.java?rev=1000559&r1=1000558&r2=1000559&view=diff
==============================================================================
--- 
commons/proper/proxy/branches/version-2.0-work/stub/src/main/java/org/apache/commons/proxy2/stub/StubInterceptor.java
 (original)
+++ 
commons/proper/proxy/branches/version-2.0-work/stub/src/main/java/org/apache/commons/proxy2/stub/StubInterceptor.java
 Thu Sep 23 18:03:09 2010
@@ -17,10 +17,13 @@
 
 package org.apache.commons.proxy2.stub;
 
+import java.lang.reflect.Method;
 import java.util.ArrayDeque;
 import java.util.Arrays;
 import java.util.Deque;
 
+import org.apache.commons.lang3.ClassUtils;
+import org.apache.commons.lang3.reflect.TypeUtils;
 import org.apache.commons.proxy2.Interceptor;
 import org.apache.commons.proxy2.Invocation;
 import org.apache.commons.proxy2.ObjectProvider;
@@ -133,7 +136,7 @@ abstract class StubInterceptor implement
     }
 
     void addAnswer(Object o) {
-        resultStack.push(new Answer(currentMatcher(), o));
+        resultStack.push(validAnswer(o));
     }
 
     void addThrow(ObjectProvider<? extends Throwable> throwableProvider) {
@@ -166,6 +169,26 @@ abstract class StubInterceptor implement
         }
     }
 
+    /**
+     * Validate and return the requested answer to the current invocation.
+     * @param o
+     * @return Answer
+     */
+    synchronized Answer validAnswer(Object o) {
+        if (currentInvocation == null) {
+            //fall through and let currentMatcher() throw the exception
+        } else if (o instanceof ObjectProvider<?>) {
+            // give ObjectProviders the benefit of the doubt?
+        } else {
+            Method m = currentInvocation.getInvokedMethod();
+            if (!TypeUtils.isInstance(o, m.getReturnType())) {
+                throw new IllegalArgumentException(String.format("%s does not 
specify a valid return value for %s", o,
+                    m));
+            }
+        }
+        return new Answer(currentMatcher(), o);
+    }
+
     void complete() {
         this.complete = true;
     }

Modified: 
commons/proper/proxy/branches/version-2.0-work/stub/src/test/java/org/apache/commons/proxy2/stub/AbstractStubProxyFactoryTest.java
URL: 
http://svn.apache.org/viewvc/commons/proper/proxy/branches/version-2.0-work/stub/src/test/java/org/apache/commons/proxy2/stub/AbstractStubProxyFactoryTest.java?rev=1000559&r1=1000558&r2=1000559&view=diff
==============================================================================
--- 
commons/proper/proxy/branches/version-2.0-work/stub/src/test/java/org/apache/commons/proxy2/stub/AbstractStubProxyFactoryTest.java
 (original)
+++ 
commons/proper/proxy/branches/version-2.0-work/stub/src/test/java/org/apache/commons/proxy2/stub/AbstractStubProxyFactoryTest.java
 Thu Sep 23 18:03:09 2010
@@ -281,6 +281,34 @@ public abstract class AbstractStubProxyF
         assertIterator(strings.iterator(), "foo", "bar", "baz");
     }
 
+    @Test(expected=IllegalArgumentException.class)
+    public void testBadReturnValue() {
+        StubProxyFactory factory = new StubProxyFactory(createParent(), new 
StubConfigurer<AcceptArguments>() {
+
+            @Override
+            protected void configure(AcceptArguments stub) {
+                when((Object) stub.respondTo("x")).thenReturn(100);
+            }
+
+        });
+
+        factory.createInvokerProxy(NullInvoker.INSTANCE, 
AcceptArguments.class);
+    }
+
+    @Test(expected=IllegalArgumentException.class)
+    public void testBadPrimitiveReturnValue() {
+        StubProxyFactory factory = new StubProxyFactory(createParent(), new 
StubConfigurer<Foo>() {
+            
+            @Override
+            protected void configure(Foo stub) {
+                when(stub.fooInt()).thenReturn(null);
+            }
+
+        });
+
+        factory.createInvokerProxy(NullInvoker.INSTANCE, Foo.class);
+    }
+
     private <T> void assertIterator(Iterator<T> iter, T... expected) {
         for (T t : expected) {
             assertTrue(iter.hasNext());