package org.codehaus.plexus.classworlds.strategy;
   
   /*
    * Copyright 2001-2006 Codehaus Foundation.
    *
    * 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.
   */
  
  import java.io.IOException;
  import java.net.URL;
  import java.util.Enumeration;
  
  import org.codehaus.plexus.classworlds.realm.ClassRealm;
  
  /**
   * @author Jason van Zyl
   */
  public class SelfFirstStrategy extends AbstractStrategy {
  
      public SelfFirstStrategy(ClassRealm realm) {
          super(realm);
      }
  
      public Class<?> loadClass(String name) throws ClassNotFoundException {
          Class<?> clazz = realm.loadClassFromImport(name);
  
          if (clazz == null) {
              clazz = realm.loadClassFromSelf(name);
  
              if (clazz == null) {
                  clazz = realm.loadClassFromParent(name);
  
                  if (clazz == null) {
                      throw new ClassNotFoundException(name);
                  }
              }
          }
  
          return clazz;
      }
  
      public URL getResource(String name) {
          URL resource = realm.loadResourceFromImport(name);
  
          if (resource == null) {
              resource = realm.loadResourceFromSelf(name);
  
              if (resource == null) {
                  resource = realm.loadResourceFromParent(name);
              }
          }
  
          return resource;
      }
  
      public Enumeration<URL> getResources(String name) throws IOException {
          Enumeration<URL> imports = realm.loadResourcesFromImport(name);
          Enumeration<URL> self = realm.loadResourcesFromSelf(name);
          Enumeration<URL> parent = realm.loadResourcesFromParent(name);
  
          return combineResources(imports, self, parent);
      }
  }