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feilong is a suite of core and expanded libraries that include utility classes, http, excel,cvs, io classes, and much much more.
//--------------------------------------------------------------------------
// Copyright (c) 1998-2004, Drew Davidson and Luke Blanshard
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// Neither the name of the Drew Davidson nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
// OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
// AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
// DAMAGE.
//--------------------------------------------------------------------------
package com.feilong.lib.ognl;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
/**
* Default class resolution. Uses Class.forName() 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 ([email protected])
* @author Drew Davidson ([email protected])
*/
public class DefaultClassResolver extends Object implements ClassResolver{
private final ConcurrentHashMap classes = new ConcurrentHashMap<>(101);
public DefaultClassResolver(){
super();
}
@Override
public Class classForName(String className,Map context) throws ClassNotFoundException{
Class result = classes.get(className);
if (result != null){
return result;
}
try{
result = toClassForName(className);
}catch (ClassNotFoundException e){
if (className.indexOf('.') > -1){
throw e;
}
// The class was not in the default package.
// Try prepending 'java.lang.'.
try{
result = toClassForName("java.lang." + className);
}catch (ClassNotFoundException e2){
// Report the specified class name as-is.
throw e;
}
}
classes.putIfAbsent(className, result);
return result;
}
protected Class toClassForName(String className) throws ClassNotFoundException{
return Class.forName(className);
}
}