TestUnifiedClassLoader.java

/*
 * Copyright (C) 2009 eXo Platform SAS.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.exoplatform.container;

import junit.framework.TestCase;

import java.net.URL;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Enumeration;

/**
 * Created by The eXo Platform SAS
 * Author : Nicolas Filotto 
 *          nicolas.filotto@exoplatform.com
 * 24 sept. 2009  
 */
public class TestUnifiedClassLoader extends TestCase
{

   public void testConstructor()
   {
      try
      {
         UnifiedClassLoader.createUnifiedClassLoaderInPrivilegedMode();
         fail("An IllegalArgumentException is expected");
      }
      catch (IllegalArgumentException e)
      {
      }
      try
      {
         UnifiedClassLoader.createUnifiedClassLoaderInPrivilegedMode(new ClassLoader[0]);
         fail("An IllegalArgumentException is expected");
      }
      catch (IllegalArgumentException e)
      {
      }      
   }
   
   public void testGetResource() throws Exception
   {
      UnifiedClassLoader mcl =
         UnifiedClassLoader.createUnifiedClassLoaderInPrivilegedMode(new ClassLoader[]{new MockClassLoader(null, null),
            new MockClassLoader(null, null)});
      assertNull(mcl.getResource(null));
      URL result = new URL("file:///foo");
      
      mcl =
         UnifiedClassLoader.createUnifiedClassLoaderInPrivilegedMode(new ClassLoader[]{new MockClassLoader(null, null),
            new MockClassLoader(result, null)});
      assertEquals(result, mcl.getResource(null));

      mcl =
         UnifiedClassLoader.createUnifiedClassLoaderInPrivilegedMode(new ClassLoader[]{new MockClassLoader(result, null),
            new MockClassLoader(null, null)});
      assertEquals(result, mcl.getResource(null));

      mcl =
         UnifiedClassLoader.createUnifiedClassLoaderInPrivilegedMode(new ClassLoader[]{
            new MockClassLoader(new URL("file:///foo2"), null), new MockClassLoader(result, null)});
      assertEquals(result, mcl.getResource(null));
   }
   
   public void testGetResources() throws Exception
   {
      UnifiedClassLoader mcl =
         UnifiedClassLoader.createUnifiedClassLoaderInPrivilegedMode(new ClassLoader[]{
            new MockClassLoader(null, Collections.enumeration(new ArrayList<URL>())),
            new MockClassLoader(null, Collections.enumeration(new ArrayList<URL>()))});
      Enumeration<URL> eResult = mcl.getResources(null);
      assertNotNull(eResult);
      assertFalse(eResult.hasMoreElements());
      mcl =
         UnifiedClassLoader.createUnifiedClassLoaderInPrivilegedMode(new ClassLoader[]{new MockClassLoader(null, null),
            new MockClassLoader(null, null)});
      eResult = mcl.getResources(null);
      assertNotNull(eResult);
      assertFalse(eResult.hasMoreElements());
      final URL result = new URL("file:///foo");
      mcl =
         UnifiedClassLoader.createUnifiedClassLoaderInPrivilegedMode(new ClassLoader[]{
            new MockClassLoader(null, Collections.enumeration(Arrays.asList(result))),
            new MockClassLoader(null, Collections.enumeration(new ArrayList<URL>()))});
      eResult = mcl.getResources(null);
      assertNotNull(eResult);
      assertTrue(eResult.hasMoreElements());
      assertEquals(result, eResult.nextElement());
      assertFalse(eResult.hasMoreElements());
      mcl =
         UnifiedClassLoader
            .createUnifiedClassLoaderInPrivilegedMode(new ClassLoader[]{
               new MockClassLoader(null, Collections.enumeration(Arrays.asList(result))),
               new MockClassLoader(null, null)});
      eResult = mcl.getResources(null);
      assertNotNull(eResult);
      assertTrue(eResult.hasMoreElements());
      assertEquals(result, eResult.nextElement());
      assertFalse(eResult.hasMoreElements());
      mcl =
         UnifiedClassLoader.createUnifiedClassLoaderInPrivilegedMode(new ClassLoader[]{
            new MockClassLoader(null, Collections.enumeration(new ArrayList<URL>())),
            new MockClassLoader(null, Collections.enumeration(Arrays.asList(result)))});
      eResult = mcl.getResources(null);
      assertNotNull(eResult);
      assertTrue(eResult.hasMoreElements());
      assertEquals(result, eResult.nextElement());
      assertFalse(eResult.hasMoreElements());
      mcl =
         UnifiedClassLoader.createUnifiedClassLoaderInPrivilegedMode(new ClassLoader[]{new MockClassLoader(null, null),
            new MockClassLoader(null, Collections.enumeration(Arrays.asList(result)))});
      eResult = mcl.getResources(null);
      assertNotNull(eResult);
      assertTrue(eResult.hasMoreElements());
      assertEquals(result, eResult.nextElement());
      assertFalse(eResult.hasMoreElements());
      final URL result1 = new URL("file:///foo");
      mcl =
         UnifiedClassLoader.createUnifiedClassLoaderInPrivilegedMode(new ClassLoader[]{
            new MockClassLoader(null, Collections.enumeration(Arrays.asList(result))),
            new MockClassLoader(null, Collections.enumeration(Arrays.asList(result1)))});
      eResult = mcl.getResources(null);
      assertNotNull(eResult);
      assertTrue(eResult.hasMoreElements());
      assertEquals(result, eResult.nextElement());
      assertFalse(eResult.hasMoreElements());
      final URL result2 = new URL("file:///foo2");
      mcl =
         UnifiedClassLoader.createUnifiedClassLoaderInPrivilegedMode(new ClassLoader[]{
            new MockClassLoader(null, Collections.enumeration(Arrays.asList(result))),
            new MockClassLoader(null, Collections.enumeration(Arrays.asList(result2)))});
      eResult = mcl.getResources(null);
      assertNotNull(eResult);
      assertTrue(eResult.hasMoreElements());
      assertEquals(result, eResult.nextElement());
      assertTrue(eResult.hasMoreElements());
      assertEquals(result2, eResult.nextElement());
      assertFalse(eResult.hasMoreElements());
   }

   private static class MockClassLoader extends ClassLoader
   {

      private final URL getResourceResult;

      private final Enumeration<URL> getResourcesResult;

      private MockClassLoader(URL getResourceResult, Enumeration<URL> getResourcesResult)
      {
         this.getResourceResult = getResourceResult;
         this.getResourcesResult = getResourcesResult;
      }

      @Override
      public URL getResource(String name)
      {
         return getResourceResult;
      }

      @Override
      public Enumeration<URL> getResources(String name)
      {
         return getResourcesResult;
      }
   }
}