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Struts example source code file (SMDMethodInterfaceTest.java)

This example Struts source code file (SMDMethodInterfaceTest.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Struts tags/keywords

classb, classc, interfacea, interfacea, interfaceb, interfaced, interfacee, method, method, object, reflection, smdmethod, smdmethod, string, string

The Struts SMDMethodInterfaceTest.java source code

/*
 * $Id: SMDMethodInterfaceTest.java 799110 2009-07-29 22:44:26Z musachy $
 *
 * 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.struts2.json;

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

import junit.framework.TestCase;

import org.apache.struts2.json.annotations.SMDMethod;

/**
 * Tests that the SMDMethod annotation can be found in interfaces when
 * ignoreSMDMethodInterface is false
 */
public class SMDMethodInterfaceTest extends TestCase {

    public interface InterfaceA {
        String getA();
    }

    public interface InterfaceB {
        @SMDMethod
        String getB();
    }

    public interface InterfaceC {
        String getC();
    }

    public interface InterfaceD {
        String getD();
    }

    public interface InterfaceE {
        String getE();
    }

    public static class ClassA extends ClassB implements InterfaceA {

        private String a;
        private String z;

        public ClassA(String a, String b, String c, String d, String e, String x, String y, String z) {
            super(b, c, d, e, x, y);
            this.a = a;
            this.z = z;
        }

        public String getA() {
            return a;
        }

        @SMDMethod
        public String getZ() {
            return z;
        }
    }

    public static class ClassB extends ClassC implements InterfaceB, InterfaceC {

        private String b;
        private String c;
        private String y;

        public ClassB(String b, String c, String d, String e, String x, String y) {
            super(d, e, x);
            this.b = b;
            this.c = c;
            this.y = y;
        }

        public String getC() {
            return c;
        }

        public String getB() {
            return b;
        }

        public String getY() {
            return y;
        }
    }

    public static class ClassC implements InterfaceD, InterfaceE {

        private String d;
        private String e;
        private String x;

        public ClassC(String d, String e, String x) {
            this.d = d;
            this.e = e;
            this.x = x;
        }

        public String getD() {
            return d;
        }

        public String getE() {
            return e;
        }

        @SMDMethod
        public String getX() {
            return x;
        }
    }

    /**
     * Asserts that the SMDMethod annotation is only detected on the classes
     * when ignoreSMDMethodInterfaces is true
     */
    public void testBaseClassOnly() {
        Method[] smdMethodsA = JSONUtil.listSMDMethods(ClassA.class, true);
        assertEquals(2, smdMethodsA.length);
        assertEquals("getZ", smdMethodsA[0].getName());
        assertEquals("getX", smdMethodsA[1].getName());

        Method[] smdMethodsB = JSONUtil.listSMDMethods(ClassB.class, true);
        assertEquals(1, smdMethodsB.length);
        assertEquals("getX", smdMethodsB[0].getName());

        Method[] smdMethodsC = JSONUtil.listSMDMethods(ClassC.class, true);
        assertEquals(1, smdMethodsC.length);
        assertEquals("getX", smdMethodsC[0].getName());
    }

    /**
     * Asserts that the SMDMethod annotation is also detected on the interfaces
     * and superclasses when ignoreSMDMethodInterfaces is false
     */
    public void testInterfaces() {
        Method[] smdMethodsA = JSONUtil.listSMDMethods(ClassA.class, false);
        assertEquals(3, smdMethodsA.length);
        assertEquals("getZ", smdMethodsA[0].getName());
        assertEquals("getX", smdMethodsA[1].getName());
        assertEquals("getB", smdMethodsA[2].getName());

        Method[] smdMethodsB = JSONUtil.listSMDMethods(ClassB.class, false);
        assertEquals(2, smdMethodsB.length);
        assertEquals("getX", smdMethodsB[0].getName());
        assertEquals("getB", smdMethodsB[1].getName());

        Method[] smdMethodsC = JSONUtil.listSMDMethods(ClassC.class, false);
        assertEquals(1, smdMethodsC.length);
        assertEquals("getX", smdMethodsC[0].getName());
    }

    /**
     * This is the important case: detects the SMDMethod annotation on a proxy
     */
    public void testWithProxy() {

        InvocationHandler handler = new InvocationHandler() {
            // dummy implementation
            public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
                return null;
            }
        };
        // proxy is proxy to an impl of ClassA
        InterfaceA proxy = (InterfaceA) Proxy.newProxyInstance(ClassA.class.getClassLoader(), new Class[] {
                InterfaceA.class, InterfaceB.class, InterfaceC.class }, handler);

        // first, without the recursion
        Method[] smdMethodsA = JSONUtil.listSMDMethods(proxy.getClass(), true);
        assertEquals(0, smdMethodsA.length);

        // now with the recursion
        Method[] smdMethodsB = JSONUtil.listSMDMethods(proxy.getClass(), false);
        assertEquals(1, smdMethodsB.length);
        assertEquals("getB", smdMethodsB[0].getName());
    }
}

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