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/**
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*
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*/
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package eu.etaxonomy.taxeditor.singlesource;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.InvocationTargetException;
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import java.util.ArrayList;
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import org.apache.log4j.Logger;
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/**
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* @author Lutz Suhrbier
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*
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*/
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public class ImplementationLoader {
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private static final Logger logger = Logger.getLogger(ImplementationLoader.class);
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public static Object newInstance(final Class<?> type, final Object... parameter) {
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String className = type.getName() + "Impl";
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Object result = null;
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logger.debug("Loading class " + className);
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Class clazz;
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try {
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clazz = type.getClassLoader().loadClass(className);
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if (parameter.length > 0) {
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ArrayList<Class<?>> parameterList = new ArrayList<Class<?>>();
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for (Object o : parameter) {
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parameterList.add(o.getClass());
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}
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Class<?>[] parameterTypes = (Class<?>[]) parameterList.toArray(new Class<?>[parameter.length]);
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Constructor constructor = getPossibleConstructor(clazz, parameterTypes);
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if (constructor == null) {
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logger.error("No constructor found for class " + className +".");
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logger.error("ParameterTypes:");
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for (Class<?> c: parameterTypes) {
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logger.debug(c.getName());
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}
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}
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else
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logger.debug("Constructor " + constructor + " found for class " + className);
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result = constructor.newInstance(parameter);
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} else
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result = clazz.newInstance();
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} catch (IllegalArgumentException e) {
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e.printStackTrace();
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} catch (InstantiationException e) {
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e.printStackTrace();
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} catch (IllegalAccessException e) {
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e.printStackTrace();
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} catch (InvocationTargetException e) {
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e.printStackTrace();
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} catch (ClassNotFoundException e) {
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e.printStackTrace();
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}
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return result;
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}
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public static Constructor getPossibleConstructor(Class motherClass, Class[] pars) {
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Constructor[] ctors = motherClass.getConstructors();
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for (Constructor c : ctors) {
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Class[] cpars = c.getParameterTypes();
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if (cpars.length != pars.length)
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continue;
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boolean found = true;
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for (int i = 0; i < cpars.length; ++i) {
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if (!cpars[i].isAssignableFrom(pars[i])) {
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found = false;
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break;
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}
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}
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if (found)
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return c;
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}
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return null;
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}
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}
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