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package ilex.util;

import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.TimeZone;

/**
 * Utilities for dealing with java beans.
 * @author mmaloney
 *
 */
public class BeanUtil
{
    public static SimpleDateFormat sdf = new SimpleDateFormat(
        "yyyy/MM/dd-HH:mm:ss");
    static { sdf.setTimeZone(TimeZone.getTimeZone("UTC")); }

    /**
     * Calls a bean's setXXX method through reflection. Intended for setting
     * bean attributes from a properties file where you have property names
     * and string values.
     * 
     * Look for a matching 'set' method for the passed name. Examine the method's
     * argument type and convert the value if necessary before calling the set
     * method.
     * @param bean the bean object
     * @param name the attribute name (non-case sensitive)
     * @param value the attribute value as a string
     * @return true if matching set method called, false if not.
     */
    public static boolean callSetMethod(Object bean, String name, String value)
    {
        Class beanCls = bean.getClass();
        Method methods[] = beanCls.getDeclaredMethods();

        // value is always string so class is "java.lang.String"

        for(Method m : methods)
        {
            String mname = m.getName();
            if (!Modifier.isPublic(m.getModifiers()))
            {
                continue;
            }
            Class argtypes[] = m.getParameterTypes();
            if (argtypes.length != 1)
            {
                continue;
            }

            if (mname.equalsIgnoreCase("set" + name))
            {
                Object arglist[] = new Object[1];
                String atype = argtypes[0].getName();
                if (atype.equals("java.lang.String"))
                    arglist[0] = value;
                else if (atype.equals("int") || atype.equals("java.lang.Integer"))
                {
                    try { arglist[0] = Integer.valueOf(value); }
                    catch(NumberFormatException ex)
                    {
                        return false;
                    }
                }
                else if (atype.equals("boolean") || atype.equals("java.lang.Boolean"))
                    arglist[0] = TextUtil.str2boolean(value);
                else if (atype.equals("java.util.Date"))
                {
                    try { arglist[0] = sdf.parse(value); }
                    catch(Exception ex)
                    {
                        return false;
                    }
                }
                try
                {
                    m.invoke(bean, arglist);
                    return true;
                }
                catch (Exception ex)
                {
                    System.err.println(ex.toString());
                }
            }
        }
        return false;
    }


    public static void main(String args[])
    {
        testbean b = new testbean();
        callSetMethod(b, "intval", "123456");
        callSetMethod(b, "BOOLVAL", "false");
        callSetMethod(b, "stringval", "this is a string");
        callSetMethod(b, "dateval", "2010/04/15-12:00:00");
    }
}
class testbean
{
    public void setIntVAL(int i1, int i2) { }
    public void setIntval(Integer i) { System.out.println("Setting intval to " + i); }
    public void setBoolVal(Boolean b) { System.out.println("Setting boolval to " + b); }
    public void setStringVal(String s) { System.out.println("Setting stringval to " + s); }
    public void setDateVal(Date d) { System.out.println("Setting dateval to " + BeanUtil.sdf.format(d)); }
}