src/test/java/org/apache/commons/proxy/factory/AbstractSubclassingProxyFactoryTestCase.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.commons.proxy.factory;

import org.apache.commons.proxy.ProxyFactory;
import org.apache.commons.proxy.exception.ProxyFactoryException;
import org.apache.commons.proxy.invoker.NullInvoker;
import org.apache.commons.proxy.provider.ConstantProvider;
import org.apache.commons.proxy.util.AbstractEcho;
import org.apache.commons.proxy.util.Echo;
import org.apache.commons.proxy.util.EchoImpl;

/**
 * @author James Carman
 * @since 1.0
 */
public abstract class AbstractSubclassingProxyFactoryTestCase extends AbstractProxyFactoryTestCase
{
    protected AbstractSubclassingProxyFactoryTestCase( ProxyFactory factory )
    {
        super( factory );
    }

    public void testWithAbstractSuperclass()
    {
        final Echo echo = ( Echo )factory.createDelegatorProxy( new ConstantProvider( new EchoImpl() ),  new Class[] { AbstractEcho.class } );
        assertEquals( "hello", echo.echoBack( "hello" ) );
        assertEquals( "helloworld", echo.echoBack( "hello", "world" ) );
    }

    public void testCanProxy()
    {
        assertTrue( factory.canProxy(  new Class[] { Echo.class } ) );
        assertTrue( factory.canProxy(  new Class[] { EchoImpl.class } ) );
        assertFalse( factory.canProxy(  new Class[] { FinalEcho.class } ) );
        assertTrue( factory.canProxy(  new Class[] { FinalMethodEcho.class, Echo.class } ) );
        assertFalse( factory.canProxy(  new Class[] { NoDefaultConstructorEcho.class } ) );
        assertTrue( factory.canProxy(  new Class[] { ProtectedConstructorEcho.class } ) );
        assertFalse( factory.canProxy(  new Class[] { InvisibleEcho.class } ) );
        assertFalse( factory.canProxy(  new Class[] { Echo.class, EchoImpl.class, String.class } ) );
    }

    public void testDelegatorWithSuperclass()
    {
        final Echo echo = ( Echo ) factory
                .createDelegatorProxy( new ConstantProvider( new EchoImpl() ),  new Class[] { Echo.class, EchoImpl.class } );
        assertTrue( echo instanceof EchoImpl );
    }

    public void testInterceptorWithSuperclass()
    {
        final Echo echo = ( Echo ) factory
                .createInterceptorProxy( new EchoImpl(), new NoOpMethodInterceptor(),  new Class[] { Echo.class, EchoImpl.class } );
        assertTrue( echo instanceof EchoImpl );
    }

    public void testInvocationHandlerWithSuperclass()
    {
        final Echo echo = ( Echo ) factory
                .createInvokerProxy( new NullInvoker(),  new Class[] { Echo.class, EchoImpl.class } );
        assertTrue( echo instanceof EchoImpl );
    }

    public void testProxiesWithClashingFinalMethodInSuperclass()
    {
        final Class[] proxyClasses = new Class[]{Echo.class, FinalMethodEcho.class};
        Echo proxy = ( Echo )factory.createDelegatorProxy( new ConstantProvider( new EchoImpl() ), proxyClasses );
        assertEquals( "final", proxy.echoBack("echo") );

        proxy = ( Echo )factory.createInterceptorProxy( new EchoImpl(), new NoOpMethodInterceptor(), proxyClasses );
        assertEquals( "final", proxy.echoBack("echo") );

        proxy = ( Echo )factory.createInvokerProxy( new NullInvoker(), proxyClasses );
        assertEquals( "final", proxy.echoBack("echo") );
    }

    public void testDelegatorWithMultipleSuperclasses()
    {
        try
        {
            factory.createDelegatorProxy( new ConstantProvider( new EchoImpl() ),
                                           new Class[] { EchoImpl.class, String.class } );
            fail();
        }
        catch( ProxyFactoryException e )
        {
        }
    }

    public void testInterceptorWithMultipleSuperclasses()
    {
        try
        {
            factory.createInterceptorProxy( new EchoImpl(), new NoOpMethodInterceptor(),
                                             new Class[] { EchoImpl.class, String.class } );
            fail();
        }
        catch( ProxyFactoryException e )
        {
        }
    }

    public void testInvocationHandlerWithMultipleSuperclasses()
    {
        try
        {
            factory.createInvokerProxy( new NullInvoker(),
                                                   new Class[] { EchoImpl.class, String.class } );
            fail();
        }
        catch( ProxyFactoryException e )
        {
        }
    }

    public static final class FinalEcho extends EchoImpl
    {
    }

    public static class FinalMethodEcho extends EchoImpl
    {
        public final String echoBack( String message )
        {
            return "final";
        }
    }

    public static class NoDefaultConstructorEcho extends EchoImpl
    {
        public NoDefaultConstructorEcho( String param )
        {
        }
    }

    public static class ProtectedConstructorEcho extends EchoImpl
    {
        protected ProtectedConstructorEcho()
        {
        }
    }

    private static class InvisibleEcho extends EchoImpl
    {
    }
}