package org.itsnat.droid.impl.xmlinflater;

import org.itsnat.droid.ItsNatDroidException;
import org.itsnat.droid.impl.util.MiscUtil;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**
 * Created by jmarranz on 23/09/14.
 */
public class MethodContainer<Treturn>
{
    protected final Class clasz;
    protected final String methodName;
    protected final Class[] paramClasses;
    protected Method method;

    public MethodContainer(String className, String methodName,Class[] paramClasses)
    {
        this(MiscUtil.resolveClass(className),methodName,paramClasses);
    }

    public MethodContainer(Class clasz, String methodName,Class[] paramClasses)
    {
        this.clasz = clasz;
        this.methodName = methodName;
        this.paramClasses = paramClasses;
    }

    public MethodContainer(String className, String methodName,Class paramClass)
    {
        this(MiscUtil.resolveClass(className),methodName,paramClass);
    }

    public MethodContainer(Class clasz, String methodName,Class paramClass)
    {
        this(clasz,methodName,new Class[]{paramClass});
    }

    public MethodContainer(Class clasz, String methodName)
    {
        this(clasz,methodName,new Class[0]);
    }

    public String getMethodName()
    {
        return methodName;
    }

    public Class[] getParamClasses()
    {
        return paramClasses;
    }

    @SuppressWarnings("unchecked")
    public Method getMethod()
    {
        try
        {
            if (method == null)
            {
                this.method = clasz.getDeclaredMethod(methodName,(Class[])paramClasses);
                method.setAccessible(true); // Pues normalmente serán atributos ocultos
            }
            return method;
        }
        catch (NoSuchMethodException ex)
        {
            throw new ItsNatDroidException(ex);
        }
    }


    @SuppressWarnings("unchecked")
    public Treturn invoke(Object obj, Object... params)
    {
        try
        {
            Method method = getMethod();
            return (Treturn)method.invoke(obj, params);
        }
        catch (IllegalAccessException ex) { throw new ItsNatDroidException(ex); }
        catch (InvocationTargetException ex)
        {
            throw new ItsNatDroidException(ex);
        }
    }
}