Instantiator.java

package org.myrobotlab.framework;

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;

import org.myrobotlab.logging.LoggerFactory;
import org.myrobotlab.logging.Logging;
import org.slf4j.Logger;

public class Instantiator {

  transient public final static Logger log = LoggerFactory.getLogger(Instantiator.class);

  static public Object getNewInstance(Class<?> cast, String classname, Object... params) {
    return getNewInstance(new Class<?>[] { cast }, classname, params);
  }

  static public Object getNewInstance(Class<?>[] cast, String classname, Object... params) {
    try {
      return getThrowableNewInstance(cast, classname, params);
    } catch (ClassNotFoundException e) {
      // quiet no class
      log.info(String.format("class %s not found", classname));
    } catch (Exception e) {
      // noisy otherwise
      Logging.logError(e);
    }
    return null;
  }

  static public Object getNewInstance(String classname) {

    return getNewInstance((Class<?>[]) null, classname, (Object[]) null);
  }

  static public Object getNewInstance(String classname, Object... params) {
    return getNewInstance((Class<?>[]) null, classname, params);
  }

  static public Object getThrowableNewInstance(Class<?>[] cast, String classname, Object... params)
      throws ClassNotFoundException, NoSuchMethodException, SecurityException, InstantiationException, IllegalAccessException, IllegalArgumentException, InvocationTargetException {
    Class<?> c;

    c = Class.forName(classname);
    if (params == null) {
      Constructor<?> mc = c.getConstructor();
      return mc.newInstance();
    } else {
      Class<?>[] paramTypes = new Class[params.length];
      for (int i = 0; i < params.length; ++i) {
        paramTypes[i] = params[i].getClass();
      }
      Constructor<?> mc = null;
      if (cast == null) {
        mc = c.getConstructor(paramTypes);
      } else {
        mc = c.getConstructor(cast);
      }
      return mc.newInstance(params); // Dynamically instantiate it
    }
  }
}