/*
    * 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.apache.commons.classscan.builtin;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertNotNull;
  import static org.junit.Assert.assertNull;
  import static org.junit.Assert.assertTrue;
  import static org.junit.Assert.fail;
  
  import java.net.URISyntaxException;
  import java.util.Collection;
  import java.util.Iterator;
  
  import org.apache.commons.classscan.MetaClassLoader;
  import org.apache.commons.classscan.MetaClassPathElement;
  import org.apache.commons.classscan.MetaRegistry;
  import org.apache.commons.classscan.model.MetaClass;
  import org.apache.commons.classscan.test.classes.FullInterface;
  import org.apache.commons.classscan.test.classes.FullyDecorated;
  import org.apache.commons.classscan.test.classes.ValidateFullyDecorated;
  import org.junit.Before;
  import org.junit.Test;
  
  public class UrlMetaClassLoaderTest {
  
      private static final String OBJECT_CANONICAL_NAME = Object.class.getCanonicalName();
      private static final String FULLY_DECORATED_NAME = FullyDecorated.class.getCanonicalName();
  
      MetaClassLoader classLoader;
      MetaClass fdClass;
      MetaClass objClass;
  
      @Before
      public void loadLocation() throws URISyntaxException {
          classLoader = MetaRegistry.DEFAULT_REGISTRY.getMetaClassLoader(getClass().getClassLoader());
          fdClass = classLoader.findMetaClass(FULLY_DECORATED_NAME);
          objClass = classLoader.findMetaClass(OBJECT_CANONICAL_NAME);
      }
  
      @Test
      public void testGetMetaClass() {
          new ValidateFullyDecorated(classLoader.getMetaClass(FULLY_DECORATED_NAME));        
          assertNull(classLoader.getMetaClass(OBJECT_CANONICAL_NAME));
      }
  
      @Test
      public void testFindMetaClass() {
          assertEquals(FULLY_DECORATED_NAME, fdClass.getName());
          assertEquals(OBJECT_CANONICAL_NAME, objClass.getName());
      }
  
      <T> boolean contains(Iterator<? extends T> classes, T toFind) {
      	while(classes.hasNext()) {
      		T mc = classes.next();
      		if(mc.equals(toFind)) {
      			return true;
      		}
      	}
      	return false;
      }
      
      @Test
      public void testGetMetaClasses() {
          Iterator<? extends MetaClass> classes = classLoader.getMetaClasses();
          assertTrue(contains(classes, fdClass));
          assertFalse(contains(classes, objClass));
      }
  
      @Test
      public void testIterateGetMetaClasses() {
          Iterator<? extends MetaClass> classes = classLoader.getMetaClasses();
          while(classes.hasNext()) {
          	assertNotNull(classes.next());
          }
      }
  
      @Test
      public void testGetClassLocations() throws URISyntaxException {
          Collection<? extends MetaClassPathElement> locations = classLoader.getClassLocations();
          MetaClassPathElement location = classLoader.getClassLocation(getClass().getProtectionDomain().getCodeSource().getLocation().toString());
          assertTrue(locations.contains(location));
      }
  
      @Test
      public void testGetParent() {
          for (int i = 0; i < 4; ++i) {
             MetaClassLoader pcl = classLoader.getParent();
             if (pcl == null) {
                 // cl is now bootstrap class loader
                 assertNotNull(classLoader.getMetaClass(Integer.class.getCanonicalName()));
                 return;
             }
             classLoader = pcl;
         }
         fail("Too many nested ClassLoaders");
     }
 
     @Test
     public void findAllImplementations() throws URISyntaxException {
         Collection<? extends MetaClass> implementations= classLoader.findAllImplementors(FullInterface.class.getCanonicalName());
         assertTrue(implementations.contains(fdClass));
         assertFalse(implementations.contains(objClass));
     }
 }