proxy-1.0-work/src/test/java/org/apache/commons/proxy/interceptor/TestMethodInterceptorAdapter.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.
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package org.apache.commons.proxy.interceptor;

import junit.framework.TestCase;
import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
import org.apache.commons.proxy.ProxyUtils;
import org.apache.commons.proxy.factory.javassist.JavassistProxyFactory;
import org.apache.commons.proxy.util.Echo;
import org.apache.commons.proxy.util.EchoImpl;

public class TestMethodInterceptorAdapter extends TestCase
{
    public void testMethodInterception()
    {
        final Echo proxy = ( Echo ) new JavassistProxyFactory().createInterceptorProxy( new EchoImpl(),
                                                                                         new MethodInterceptorAdapter( new SuffixMethodInterceptor(
                                                                                                 " suffix" ) ),
                                                                                         new Class[]{ Echo.class } );
        assertEquals( "message suffix", proxy.echoBack( "message" ) );
    }

    public void testMethodInvocationImplementation() throws Exception
    {
        final InterceptorTester tester = new InterceptorTester();
        final EchoImpl target = new EchoImpl();
        final Echo proxy = ( Echo ) new JavassistProxyFactory().createInterceptorProxy( target, new MethodInterceptorAdapter( tester ), new Class[] { Echo.class } );
        proxy.echo();
        assertNotNull( tester.invocation.getArguments() );
        assertEquals( 0, tester.invocation.getArguments().length );
        assertEquals( Echo.class.getMethod( "echo", new Class[] {} ), tester.invocation.getMethod() );
        assertEquals( Echo.class.getMethod( "echo", new Class[] {} ), tester.invocation.getStaticPart() );
        assertEquals( target, tester.invocation.getThis() );
        proxy.echoBack( "Hello" );
        assertNotNull( tester.invocation.getArguments() );
        assertEquals( 1, tester.invocation.getArguments().length );
        assertEquals( "Hello", tester.invocation.getArguments()[0] );
        assertEquals( Echo.class.getMethod( "echoBack", new Class[] { String.class } ), tester.invocation.getMethod() );
        assertEquals( Echo.class.getMethod( "echoBack", new Class[] { String.class } ), tester.invocation.getStaticPart() );
        proxy.echoBack( "Hello", "World" );
        assertNotNull( tester.invocation.getArguments() );
        assertEquals( 2, tester.invocation.getArguments().length );
        assertEquals( "Hello", tester.invocation.getArguments()[0] );
        assertEquals( "World", tester.invocation.getArguments()[1] );
        assertEquals( Echo.class.getMethod( "echoBack", new Class[] { String.class, String.class } ), tester.invocation.getMethod() );
        assertEquals( Echo.class.getMethod( "echoBack", new Class[] { String.class, String.class } ), tester.invocation.getStaticPart() );
    }
    private static class InterceptorTester implements MethodInterceptor
    {
        private MethodInvocation invocation;

        public Object invoke( MethodInvocation methodInvocation ) throws Throwable
        {
            this.invocation = methodInvocation;
            return methodInvocation.proceed();
        }
    }
    private class SuffixMethodInterceptor implements MethodInterceptor
    {
        private final String suffix;

        public SuffixMethodInterceptor( String suffix )
        {
            this.suffix = suffix;
        }

        public Object invoke( MethodInvocation methodInvocation ) throws Throwable
        {
            return methodInvocation.proceed() + suffix;
        }
    }
}