/*
    * Copyright (C) 2006 The Guava 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 com.google.common.reflect;
  
  import com.google.common.testing.NullPointerTester;
  
  import junit.framework.TestCase;
  
  import java.lang.reflect.InvocationHandler;
  import java.lang.reflect.Method;
  import java.util.Map;
  
  /** Tests for {@link Reflection} */
  public class ReflectionTest extends TestCase {
  
    public void testGetPackageName() throws Exception {
      assertEquals("java.lang", Reflection.getPackageName(Iterable.class));
      assertEquals("java", Reflection.getPackageName("java.MyType"));
      assertEquals("java.lang", Reflection.getPackageName(Iterable.class.getName()));
      assertEquals("", Reflection.getPackageName("NoPackage"));
      assertEquals("java.util", Reflection.getPackageName(Map.Entry.class));
    }
  
    public void testNewProxy() throws Exception {
      Runnable runnable = Reflection.newProxy(Runnable.class, X_RETURNER);
      assertEquals("x", runnable.toString());
    }
  
    public void testNewProxyCantWorkOnAClass() throws Exception {
      try {
        Reflection.newProxy(Object.class, X_RETURNER);
        fail();
      } catch (IllegalArgumentException expected) {
      }
    }
  
    private static final InvocationHandler X_RETURNER = new InvocationHandler() {
      @Override
      public Object invoke(Object proxy, Method method, Object[] args)
          throws Throwable {
        return "x";
      }
    };
  
    private static int classesInitialized = 0;
    private static class A {
      static {
        ++classesInitialized;
      }
    }
    private static class B {
      static {
        ++classesInitialized;
      }
    }
    private static class C {
      static {
        ++classesInitialized;
      }
    }
  
    public void testInitialize() {
      assertEquals("This test can't be included twice in the same suite.", 0, classesInitialized);
  
      Reflection.initialize(A.class);
      assertEquals(1, classesInitialized);
  
      Reflection.initialize(
          A.class,  // Already initialized (above)
          B.class,
          C.class);
      assertEquals(3, classesInitialized);
    }
  
    public void testNullPointers() {
      new NullPointerTester().testAllPublicStaticMethods(Reflection.class);
    }
  }