Spring Framework example source code file (MethodInvokerTests.java)

This example Spring Framework source code file (MethodInvokerTests.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 - Spring Framework tags/keywords

arraylist, exception, greeter, greeter, integer, list, methodinvoker, methodinvoker, object, object, regular, string, string, util, vip

The Spring Framework MethodInvokerTests.java source code

/*
 * 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.util;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

import junit.framework.TestCase;

/**
 * @author Colin Sampaleanu
 * @author Juergen Hoeller
 * @since 21.11.2003
 */
public class MethodInvokerTests extends TestCase {

	public void testPlainMethodInvoker() throws Exception {
		// sanity check: singleton, non-static should work
		TestClass1 tc1 = new TestClass1();
		MethodInvoker mi = new MethodInvoker();
		mi.setTargetObject(tc1);
		mi.setTargetMethod("method1");
		mi.prepare();
		Integer i = (Integer) mi.invoke();
		assertEquals(1, i.intValue());

		// sanity check: check that argument count matching works
		mi = new MethodInvoker();
		mi.setTargetClass(TestClass1.class);
		mi.setTargetMethod("supertypes");
		mi.setArguments(new Object[] {new ArrayList(), new ArrayList(), "hello"});
		mi.prepare();
		assertEquals("hello", mi.invoke());

		mi = new MethodInvoker();
		mi.setTargetClass(TestClass1.class);
		mi.setTargetMethod("supertypes2");
		mi.setArguments(new Object[] {new ArrayList(), new ArrayList(), "hello", "bogus"});
		mi.prepare();
		assertEquals("hello", mi.invoke());

		// Sanity check: check that argument conversion doesn't work with plain MethodInvoker
		mi = new MethodInvoker();
		mi.setTargetClass(TestClass1.class);
		mi.setTargetMethod("supertypes2");
		mi.setArguments(new Object[] {new ArrayList(), new ArrayList(), "hello", Boolean.TRUE});
		try {
			mi.prepare();
			fail("Shouldn't have matched without argument conversion");
		}
		catch (NoSuchMethodException ex) {
			// expected
		}
	}

	public void testStringWithMethodInvoker() throws Exception {
		try {
			MethodInvoker methodInvoker = new MethodInvoker();
			methodInvoker.setTargetObject(new Greeter());
			methodInvoker.setTargetMethod("greet");
			methodInvoker.setArguments(new Object[] {new String("no match")});
			methodInvoker.prepare();
			fail("Should have thrown a NoSuchMethodException");
		}
		catch (NoSuchMethodException e) {
			// expected
		}
	}

	public void testPurchaserWithMethodInvoker() throws Exception {
		MethodInvoker methodInvoker = new MethodInvoker();
		methodInvoker.setTargetObject(new Greeter());
		methodInvoker.setTargetMethod("greet");
		methodInvoker.setArguments(new Object[] {new Purchaser()});
		methodInvoker.prepare();
		String greeting = (String) methodInvoker.invoke();
		assertEquals("purchaser: hello", greeting);
	}

	public void testShopperWithMethodInvoker() throws Exception {
		MethodInvoker methodInvoker = new MethodInvoker();
		methodInvoker.setTargetObject(new Greeter());
		methodInvoker.setTargetMethod("greet");
		methodInvoker.setArguments(new Object[] {new Shopper()});
		methodInvoker.prepare();
		String greeting = (String) methodInvoker.invoke();
		assertEquals("purchaser: may I help you?", greeting);
	}

	public void testSalesmanWithMethodInvoker() throws Exception {
		MethodInvoker methodInvoker = new MethodInvoker();
		methodInvoker.setTargetObject(new Greeter());
		methodInvoker.setTargetMethod("greet");
		methodInvoker.setArguments(new Object[] {new Salesman()});
		methodInvoker.prepare();
		String greeting = (String) methodInvoker.invoke();
		assertEquals("greetable: how are sales?", greeting);
	}

	public void testCustomerWithMethodInvoker() throws Exception {
		MethodInvoker methodInvoker = new MethodInvoker();
		methodInvoker.setTargetObject(new Greeter());
		methodInvoker.setTargetMethod("greet");
		methodInvoker.setArguments(new Object[] {new Customer()});
		methodInvoker.prepare();
		String greeting = (String) methodInvoker.invoke();
		assertEquals("customer: good day", greeting);
	}

	public void testRegularWithMethodInvoker() throws Exception {
		MethodInvoker methodInvoker = new MethodInvoker();
		methodInvoker.setTargetObject(new Greeter());
		methodInvoker.setTargetMethod("greet");
		methodInvoker.setArguments(new Object[] {new Regular("Kotter")});
		methodInvoker.prepare();
		String greeting = (String) methodInvoker.invoke();
		assertEquals("regular: welcome back Kotter", greeting);
	}

	public void testVIPWithMethodInvoker() throws Exception {
		MethodInvoker methodInvoker = new MethodInvoker();
		methodInvoker.setTargetObject(new Greeter());
		methodInvoker.setTargetMethod("greet");
		methodInvoker.setArguments(new Object[] {new VIP("Fonzie")});
		methodInvoker.prepare();
		String greeting = (String) methodInvoker.invoke();
		assertEquals("regular: whassup dude?", greeting);
	}


	public static class TestClass1 {

		public static int _staticField1;

		public int _field1 = 0;

		public int method1() {
			return ++_field1;
		}

		public static int staticMethod1() {
			return ++TestClass1._staticField1;
		}

		public static void voidRetvalMethod() {
		}

		public static void nullArgument(Object arg) {
		}

		public static void intArgument(int arg) {
		}

		public static void intArguments(int[] arg) {
		}

		public static String supertypes(Collection c, Integer i) {
			return i.toString();
		}

		public static String supertypes(Collection c, List l, String s) {
			return s;
		}

		public static String supertypes2(Collection c, List l, Integer i) {
			return i.toString();
		}

		public static String supertypes2(Collection c, List l, String s, Integer i) {
			return s;
		}

		public static String supertypes2(Collection c, List l, String s, String s2) {
			return s;
		}
	}


	public static class Greeter {

		// should handle Salesman (only interface)
		public String greet(Greetable greetable) {
			return "greetable: " + greetable.getGreeting();
		}

		// should handle Shopper (beats Greetable since it is a class)
		protected String greet(Purchaser purchaser) {
			return "purchaser: " + purchaser.getGreeting();
		}

		// should handle Customer (exact match)
		String greet(Customer customer) {
			return "customer: " + customer.getGreeting();
		}

		// should handle Regular (exact) and VIP (closest match)
		private String greet(Regular regular) {
			return "regular: " + regular.getGreeting();
		}
	}


	private static interface Greetable {

		String getGreeting();
	}


	private static interface Person extends Greetable {
	}


	private static class Purchaser implements Greetable {

		public String getGreeting() {
			return "hello";
		}
	}


	private static class Shopper extends Purchaser implements Person {

		public String getGreeting() {
			return "may I help you?";
		}
	}


	private static class Salesman implements Person {

		public String getGreeting() {
			return "how are sales?";
		}
	}


	private static class Customer extends Shopper {

		public String getGreeting() {
			return "good day";
		}
	}


	private static class Regular extends Customer {

		private String name;

		public Regular(String name) {
			this.name = name;
		}

		public String getGreeting() {
			return "welcome back " + name ;
		}
	}


	private static class VIP extends Regular {

		public VIP(String name) {
			super(name);
		}

		public String getGreeting() {
			return "whassup dude?";
		}
	}

}