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package org.scalameter.japi;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.lang.reflect.Method;

// Makes the object Method Serializable,
// taken from http://stackoverflow.com/questions/4919205/java-serializing-methods
public class SerializableMethod implements Serializable {
  private static final long serialVersionUID = 6631604036553063682L;
  private Method method;

  public SerializableMethod(Method method) {
    this.method = method;
  }

  public Method getMethod() {
    return method;
  }

  public Object invoke(Object o) {
    Object ret = null;
    try {
      ret = method.invoke(o);
    } catch (Exception e) {
      e.printStackTrace();
      if (e.getCause() != null) e.getCause().printStackTrace();
    }
    return ret;
  }

  public Object invokeA(Object o1, Object o2) {
    Object ret = null;
    try {
      ret = method.invoke(o1, o2);
    } catch (Exception e) {
      e.printStackTrace();
      if (e.getCause() != null) e.getCause().printStackTrace();
    }
    return ret;
  }

  private void writeObject(ObjectOutputStream out) throws IOException {
    out.writeObject(method.getDeclaringClass());
    out.writeUTF(method.getName());
    out.writeObject(method.getParameterTypes());
  }

  private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
    Class declaringClass = (Class) in.readObject();
    String methodName = in.readUTF();
    Class[] parameterTypes = (Class[]) in.readObject();
    try {
      method = declaringClass.getMethod(methodName, parameterTypes);
    } catch (Exception e) {
      throw new IOException(String.format("Error occurred resolving deserialized method '%s.%s'", declaringClass.getSimpleName(), methodName), e);
    }
  }
}