| /* |
| * Copyright 2005-2008 Les Hazlewood |
| * |
| * 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.jsecurity.util; |
| |
| import java.lang.reflect.Constructor; |
| |
| /** |
| * @since 0.1 |
| * @author Les Hazlewood |
| */ |
| public class ClassUtils { |
| |
| public static ClassLoader getDefaultClassLoader() { |
| ClassLoader cl = Thread.currentThread().getContextClassLoader(); |
| if ( cl == null ) { |
| cl = ClassUtils.class.getClassLoader(); |
| } |
| return cl; |
| } |
| |
| public static Class forName( String fullyQualified ) throws UnknownClassException { |
| ClassLoader cl = getDefaultClassLoader(); |
| try { |
| return cl.loadClass( fullyQualified ); |
| } catch ( ClassNotFoundException e ) { |
| String msg = "Unable to load class name [" + fullyQualified + "] from ClassLoader [" + |
| cl + "]"; |
| throw new UnknownClassException( msg, e ); |
| } |
| } |
| |
| public static boolean isAvailable( String fullyQualifiedClassName ) { |
| try { |
| forName( fullyQualifiedClassName ); |
| return true; |
| } catch (UnknownClassException e) { |
| return false; |
| } |
| } |
| |
| public static Object newInstance( String fqcn ) { |
| return newInstance( forName( fqcn ) ); |
| } |
| |
| public static Object newInstance( Class clazz ) { |
| if ( clazz == null ) { |
| String msg = "Class method parameter cannot be null."; |
| throw new IllegalArgumentException( msg ); |
| } |
| try { |
| return clazz.newInstance(); |
| } catch ( Exception e ) { |
| throw new org.jsecurity.util.InstantiationException( "Unable to instantiate class [" + clazz.getName() + "]", e ); |
| } |
| } |
| |
| public static Object instantiate( Constructor ctor, Object[] args ) { |
| try { |
| return ctor.newInstance( args ); |
| } catch ( Exception e ) { |
| String msg = "Unable to instantiate Permission instance with constructor [" + ctor + "]"; |
| throw new org.jsecurity.util.InstantiationException( msg, e ); |
| } |
| } |
| |
| |
| } |