dcevm/dcevm/src/test/java7/com/github/dcevm/test/methods/MethodReflectionTest.java

/*
 * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * questions.
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package com.github.dcevm.test.methods;

import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;

import java.lang.reflect.Method;

import static com.github.dcevm.test.util.HotSwapTestHelper.__toVersion__;
import static com.github.dcevm.test.util.HotSwapTestHelper.__version__;
import static org.junit.Assert.assertEquals;

/**
 * Testing correct reflection functionality after class redefinition.
 *
 * @author Thomas Wuerthinger
 */
public class MethodReflectionTest {

  @Before
  public void setUp() throws Exception {
    __toVersion__(0);
  }

  // Version 0
  public static class A {

    public int value() {
      return 1;
    }
  }

  public static class B extends A {

    @Override
    public int value() {
      return 2;
    }
  }

  public static class C extends A {

    @Override
    public int value() {
      return 3;
    }
  }

  // Version 1
  public static class A___1 {

    public int value() {
      return 1;
    }

    public int value2() {
      return 2;
    }
  }

  // Version 2
  public static class C___2 extends B {

    @Override
    public int value() {
      return super.value();
    }
  }

  @Test
  public void testMethodReflection() {

    assert __version__() == 0;

    A a = new A();
    B b = new B();
    C c = new C();

    assertEquals(1, a.value());
    assertEquals(2, b.value());
    assertEquals(3, c.value());

    assertContainsMethod(A.class, "value");
    assertDoesNotContainMethod(A.class, "value2");

    __toVersion__(1);

    assertEquals(1, a.value());
    assertEquals(2, b.value());
    assertEquals(3, c.value());

    assertContainsMethod(A.class, "value");
    assertContainsMethod(A.class, "value2");

    __toVersion__(0);

    assertEquals(1, a.value());
    assertEquals(2, b.value());
    assertEquals(3, c.value());

    assertContainsMethod(A.class, "value");
    assertDoesNotContainMethod(A.class, "value2");
  }

  private void assertContainsMethod(Class<?> c, String methodName) {
    boolean found = false;
    for (Method m : c.getDeclaredMethods()) {
      if (m.getName().equals(methodName)) {
        found = true;
        break;
      }
    }

    Assert.assertTrue(found);
  }

  private void assertDoesNotContainMethod(Class<?> c, String methodName) {
    boolean found = false;
    for (Method m : c.getDeclaredMethods()) {
      if (m.getName().equals(methodName)) {
        found = true;
        break;
      }
    }

    Assert.assertFalse(found);
  }

  // Version 0
  public static class TestArgumentRedefined {
    public static String hello(TestArgumentRedefined arg) {
      return arg.doHello();
    }

    public String doHello() {
      return "hello0";
    }
  }

  public static class TestArgumentRedefined___1 {
    public static String hello(TestArgumentRedefined arg) {
      return arg.doHello();
    }

    public String doHello() {
      return "hello1";
    }
  }

  @Test
  public void testReflectionArgumentRedefined() throws Exception {

    assert __version__() == 0;

    TestArgumentRedefined t = new TestArgumentRedefined();
    Method declaredMethod = TestArgumentRedefined.class.getDeclaredMethod("hello",
            TestArgumentRedefined.class);


    for (int i = 0; i < 10; i++) {
      assertEquals("hello0", declaredMethod.invoke(null, t));

      __toVersion__(1);

      assertEquals("hello1", declaredMethod.invoke(null, t));

      __toVersion__(0);
    }
  }

}