/************************************************************************* * * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * Copyright 2000, 2010 Oracle and/or its affiliates. * * OpenOffice.org - a multi-platform office productivity suite * * This file is part of OpenOffice.org. * * OpenOffice.org is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License version 3 * only, as published by the Free Software Foundation. * * OpenOffice.org is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License version 3 for more details * (a copy is included in the LICENSE file that accompanied this code). * * You should have received a copy of the GNU Lesser General Public License * version 3 along with OpenOffice.org. If not, see * <http://www.openoffice.org/license.html> * for a copy of the LGPLv3 License. * ************************************************************************/ package util; import java.lang.reflect.Constructor; public class DynamicClassLoader { /** * This method returns a class created by its name * created by call to <code>Class.forName()</code>.<p> * This method must be overloaded if another loading * policy is required for Component and Interface * testing classes. * @param className The name of the class to create. * @return The created class. */ public static Class forName(String className) throws ClassNotFoundException { return Class.forName(className) ; } /** * Get an instance of a class. The empty constructor is used. * @param className The class to instantiate. * @return The instance of the class. */ public Object getInstance(String className) throws IllegalArgumentException { try { Class cls = DynamicClassLoader.forName(className); return cls.newInstance(); } catch ( ClassNotFoundException e ) { throw new IllegalArgumentException("Couldn't find " + className + " " + e); } catch ( IllegalAccessException e ) { throw new IllegalArgumentException("Couldn't access " + className + " " + e); } catch ( InstantiationException e ) { throw new IllegalArgumentException("Couldn't instantiate " + className + " " + e); } } /** * Get an instance of a class. The constructor matching to the * arguments is used and the arguments are given to this constructor. * @param className The class to instantiate. * @param ctorArgs Arguments for the constructor. * @return The instance of the class. */ public Object getInstance(String className, Object[] ctorArgs) throws IllegalArgumentException { Class[] ctorType = new Class[ctorArgs.length]; for(int i=0; i<ctorType.length; i++) { ctorType[i] = ctorArgs[i].getClass(); } return getInstance(className, ctorType, ctorArgs); } /** * Get an instance of a class. The constructor matching to the * given calss types is used and the instance is created using the arguments * for the constructor. * @param className The class to instantiate. * @param ctorClassTypes The class types matching to the constructor. * @param ctorArgs Arguments for the constructor. * @return The instance of the class. */ public Object getInstance(String className, Class[]ctorClassTypes, Object[] ctorArgs) throws IllegalArgumentException { try { Class cls = DynamicClassLoader.forName(className); Constructor ctor = cls.getConstructor(ctorClassTypes); System.out.println("ctor: " + ctor.getName() + " " + ctor.getModifiers()); return ctor.newInstance(ctorArgs); } catch ( ClassNotFoundException e ) { throw new IllegalArgumentException("Couldn't find " + className + " " + e); } catch ( IllegalAccessException e ) { throw new IllegalArgumentException("Couldn't access " + className + " " + e); } catch ( NoSuchMethodException e ) { throw new IllegalArgumentException("Couldn't find constructor for " + className + " " + e); } catch ( java.lang.reflect.InvocationTargetException e ) { e.printStackTrace(); throw new IllegalArgumentException("Couldn't invoke " + className + " " + e); } catch ( InstantiationException e ) { throw new IllegalArgumentException("Couldn't instantiate " + className + " " + e); } } }