112 lines
3.3 KiB
Java
112 lines
3.3 KiB
Java
/*
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* Copyright (c) 2010, 2011
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*
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* Robert von Burg <eitch@eitchnet.ch>
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*
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*/
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/*
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* This file is part of Privilege.
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*
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* Privilege is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Privilege is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with Privilege. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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package ch.eitchnet.privilege.helper;
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import ch.eitchnet.privilege.i18n.PrivilegeException;
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/**
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* The {@link ClassHelper} class is a helper to instantiate classes using reflection
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*
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* @author Robert von Burg <eitch@eitchnet.ch>
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*/
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public class ClassHelper {
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/**
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* Returns an instance of the class' name given by instantiating the class through an empty arguments constructor
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*
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* @param <T>
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* the type of the class to return
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* @param className
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* the name of a class to instantiate through an empty arguments constructor
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*
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* @return the newly instantiated object from the given class name
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*
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* @throws PrivilegeException
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* if the class could not be instantiated
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*/
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@SuppressWarnings("unchecked")
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public static <T> T instantiateClass(String className) throws PrivilegeException {
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try {
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Class<T> clazz = (Class<T>) Class.forName(className);
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return clazz.getConstructor().newInstance();
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} catch (Exception e) {
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throw new PrivilegeException("The class " + className + " could not be instantiated: ", e);
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}
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}
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/**
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* Instantiates an object for the given {@link Class} using an empty arguments constructor
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*
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* @param <T>
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* the type of the class to return
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* @param clazz
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* the {@link Class} from which a new object is to be instantiated using an empty arguments constructor
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*
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* @return the newly instantiated object from the given {@link Class}
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*
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* @throws PrivilegeException
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* if the {@link Class} could not be instantiated
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*/
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public static <T> T instantiateClass(Class<T> clazz) throws PrivilegeException {
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try {
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return clazz.getConstructor().newInstance();
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} catch (Exception e) {
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throw new PrivilegeException("The class " + clazz.getName() + " could not be instantiated: ", e);
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}
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}
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/**
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* Loads the {@link Class} object for the given class name
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*
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* @param <T>
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* the type of {@link Class} to return
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* @param className
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* the name of the {@link Class} to load and return
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*
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* @return the {@link Class} object for the given class name
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*
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* @throws PrivilegeException
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* if the class could not be instantiated
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*/
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@SuppressWarnings("unchecked")
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public static <T> Class<T> loadClass(String className) throws PrivilegeException {
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try {
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Class<T> clazz = (Class<T>) Class.forName(className);
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return clazz;
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} catch (Exception e) {
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throw new PrivilegeException("The class " + className + " could not be instantiated: ", e);
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}
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}
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}
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