core/camel-core/src/test/java/org/apache/camel/component/bean/BeanWithAnnotationInheritedTest.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.camel.component.bean;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;

import org.apache.camel.ContextTestSupport;
import org.apache.camel.Header;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.component.mock.MockEndpoint;
import org.apache.camel.spi.Registry;
import org.junit.jupiter.api.Test;

/**
 * Test inheritance of parameter binding annotations from superclasses and interfaces.
 */
public class BeanWithAnnotationInheritedTest extends ContextTestSupport {

    @Test
    public void testWithAnnotationsFromOneInterface() throws Exception {
        MockEndpoint mock = getMockEndpoint("mock:result");
        mock.expectedBodiesReceived("x1y1");
        template.requestBody("direct:in1", "whatever");
        mock.assertIsSatisfied();
    }

    @Test
    public void testWithAnnotationsFromTwoInterfaces() throws Exception {
        MockEndpoint mock = getMockEndpoint("mock:result");
        mock.expectedBodiesReceived("x2y2");
        template.requestBody("direct:in2", "whatever");
        mock.assertIsSatisfied();
    }

    @Test
    public void testWithAnnotationsFromSuperclassAndInterface() throws Exception {
        MockEndpoint mock = getMockEndpoint("mock:result");
        mock.expectedBodiesReceived("x3y3");
        template.requestBody("direct:in3", "whatever");
        mock.assertIsSatisfied();
    }

    @Test
    public void testWithAnnotationsFromImplementationClassAndInterface() throws Exception {
        MockEndpoint mock = getMockEndpoint("mock:result");
        mock.expectedBodiesReceived("x4y4");
        template.requestBody("direct:in4", "whatever");
        mock.assertIsSatisfied();
    }

    @Test
    public void testWithAnnotationsFromOneInterfaceInheritedByProxy() throws Exception {
        MockEndpoint mock = getMockEndpoint("mock:result");
        mock.expectedBodiesReceived("x5y5");
        template.requestBody("direct:in5", "whatever");
        mock.assertIsSatisfied();
    }

    @Override
    protected Registry createCamelRegistry() throws Exception {
        Registry answer = super.createCamelRegistry();

        answer.bind("b", new B());
        answer.bind("p", Proxy.newProxyInstance(I1.class.getClassLoader(), new Class[] { I1.class }, new InvocationHandler() {
            @Override
            public Object invoke(Object proxy, Method method, Object[] args) {
                if (method.getName().equals("m1")) {
                    return args[0].toString() + args[1].toString();
                } else {
                    return null;
                }
            }
        }));
        return answer;
    }

    @Override
    protected RouteBuilder createRouteBuilder() {
        return new RouteBuilder() {
            public void configure() {
                from("direct:in1").setHeader("foo", constant("x1")).setHeader("bar", constant("y1")).to("bean:b?method=m1")
                        .to("mock:result");
                from("direct:in2").setHeader("foo", constant("x2")).setHeader("bar", constant("y2")).to("bean:b?method=m2")
                        .to("mock:result");
                from("direct:in3").setHeader("foo", constant("x3")).setHeader("bar", constant("y3")).to("bean:b?method=m3")
                        .to("mock:result");
                from("direct:in4").setHeader("foo", constant("x4")).setHeader("bar", constant("y4")).to("bean:b?method=m4")
                        .to("mock:result");
                from("direct:in5").setHeader("foo", constant("x5")).setHeader("bar", constant("y5")).to("bean:p?method=m1")
                        .to("mock:result");
            }
        };
    }

    private interface I1 {
        String m1(@Header("foo") String h1, @Header("bar") String h2);

        String m2(@Header("foo") String h1, String h2);
    }

    private interface I2 {
        String m2(String h1, @Header("bar") String h2);

        String m3(@Header("foo") String h1, String h2);

        String m4(@Header("foo") String h1, String h2);
    }

    private abstract static class A implements I2 {
        @Override
        public String m3(String h1, @Header("bar") String h2) {
            return h1 + h2;
        }
    }

    private static class B extends A implements I1 {
        @Override
        public String m1(String h1, String h2) {
            return h1 + h2;
        }

        @Override
        public String m2(String h1, String h2) {
            return h1 + h2;
        }

        @Override
        public String m4(String h1, @Header("bar") String h2) {
            return h1 + h2;
        }
    }
}