package org.apache.commons.ognl;

 /*

  * Licensed to the Apache Software Foundation (ASF) under one

  * or more contributor license agreements.  See the NOTICE file

  * distributed with this work for additional information

  * regarding copyright ownership.  The ASF licenses this file

  * to you 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.util.HashMap;

 import java.util.Map;

 /**

  * Default class resolution. Uses ClassLoader.loadClass() to look up classes by name. It also looks in the "java.lang"

  * package

  * if the class named does not give a package specifier, allowing easier usage of these classes.

  *

  * @author Luke Blanshard (blanshlu@netscape.net)

  * @author Drew Davidson (drew@ognl.org)

  */

 public class DefaultClassResolver

     implements ClassResolver

 {

     private final Map<String, Class<?>> classes = new HashMap<String, Class<?>>( 101 );

     /**

      * Resolves a class for a given className

      *

      * @param className The name of the Class

      * @return The resulting Class object

      * @throws ClassNotFoundException If the class could not be found

      */

     public Class<?> classForName( String className )

         throws ClassNotFoundException

     {

         return classForName( className, null );

     }

     /**

      * {@inheritDoc}

      */

     public Class<?> classForName( String className, Map<String, Object> unused )

         throws ClassNotFoundException

     {

         Class<?> result = classes.get( className );

         if ( result == null )

         {

             ClassLoader classLoader = ClassLoader.getSystemClassLoader();

             try

             {

                 result = classLoader.loadClass( className );

             }

             catch ( ClassNotFoundException ex )

             {

                 if ( className.indexOf( '.' ) == -1 )

                 {

                     result = classLoader.loadClass( "java.lang." + className );

                     classes.put( "java.lang." + className, result );

                 }

             }

             classes.put( className, result );

         }

         return result;

     }

 }