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/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* 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 .
*/
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.
*/
private 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);
}
}
}
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