/*
 * Copyright 2002-2008 the original author or authors.
 *
 * Licensed 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.springframework.aop.aspectj.annotation;

import static org.junit.Assert.*;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.junit.Test;

import test.aop.PerThisAspect;


/**
 * @author Rob Harrop
 * @author Juergen Hoeller
 * @author Chris Beams
 */
public final class AspectProxyFactoryTests {

	@Test(expected=IllegalArgumentException.class)
	public void testWithNonAspect() {
		AspectJProxyFactory proxyFactory = new AspectJProxyFactory(new TestBean());
		proxyFactory.addAspect(TestBean.class);
	}

	@Test
	public void testWithSimpleAspect() throws Exception {
		TestBean bean = new TestBean();
		bean.setAge(2);
		AspectJProxyFactory proxyFactory = new AspectJProxyFactory(bean);
		proxyFactory.addAspect(MultiplyReturnValue.class);
		ITestBean proxy = proxyFactory.getProxy();
		assertEquals("Multiplication did not occur", bean.getAge() * 2, proxy.getAge());
	}

	@Test
	public void testWithPerThisAspect() throws Exception {
		TestBean bean1 = new TestBean();
		TestBean bean2 = new TestBean();

		AspectJProxyFactory pf1 = new AspectJProxyFactory(bean1);
		pf1.addAspect(PerThisAspect.class);

		AspectJProxyFactory pf2 = new AspectJProxyFactory(bean2);
		pf2.addAspect(PerThisAspect.class);

		ITestBean proxy1 = pf1.getProxy();
		ITestBean proxy2 = pf2.getProxy();

		assertEquals(0, proxy1.getAge());
		assertEquals(1, proxy1.getAge());
		assertEquals(0, proxy2.getAge());
		assertEquals(2, proxy1.getAge());
	}

	@Test(expected=IllegalArgumentException.class)
	public void testWithInstanceWithNonAspect() throws Exception {
		AspectJProxyFactory pf = new AspectJProxyFactory();
		pf.addAspect(new TestBean());
	}

	@Test
	public void testWithInstance() throws Exception {
		MultiplyReturnValue aspect = new MultiplyReturnValue();
		int multiple = 3;
		aspect.setMultiple(multiple);

		TestBean target = new TestBean();
		target.setAge(24);

		AspectJProxyFactory proxyFactory = new AspectJProxyFactory(target);
		proxyFactory.addAspect(aspect);

		ITestBean proxy = proxyFactory.getProxy();

		assertEquals(target.getAge() * multiple, proxy.getAge());
	}

	@Test(expected=IllegalArgumentException.class)
	public void testWithNonSingletonAspectInstance() throws Exception {
		AspectJProxyFactory pf = new AspectJProxyFactory();
		pf.addAspect(new PerThisAspect());
	}


	public static interface ITestBean {

		int getAge();
	}


	public static class TestBean implements ITestBean {

		private int age;

		public int getAge() {
			return age;
		}

		public void setAge(int age) {
			this.age = age;
		}
	}

}


/**
 * @author Rod Johnson
 */
@Aspect
class MultiplyReturnValue {

	private int multiple = 2;

	public int invocations;

	public void setMultiple(int multiple) {
		this.multiple = multiple;
	}

	public int getMultiple() {
		return this.multiple;
	}

	@Around("execution(int *.getAge())")
	public Object doubleReturnValue(ProceedingJoinPoint pjp) throws Throwable {
		++this.invocations;
		int result = (Integer) pjp.proceed();
		return result * this.multiple;
	}

}
