Re: to get values passed to a method as its arguments - how?

From:
Adam Wozniak <adaslaw@gmail.com>
Newsgroups:
comp.lang.java.programmer
Date:
Sat, 15 Aug 2009 06:33:41 -0700 (PDT)
Message-ID:
<305e3805-6b02-4f35-8ac3-0d72bf50da38@26g2000yqk.googlegroups.com>
On 15 Sie, 13:20, Tom Anderson <t...@urchin.earth.li> wrote:

... but I cannot (well: I absolutely don't want) to lose information
about parameter types (for obvious reasons).


Your reasons aren't at all obvious, to me at least.


Because what you meant was that you don't want to lose information about
parameter *names*. Fair enough.


Yes, you are correct. I would like to have a full automatic routine to
collect *names* and values of all arguments passed to my method.
In particular: after adding another parameter to my method I don't
want to remember, that I must add this parameter to all exception
messages.

I like to automatize things which are the same for most cases. For
example, in my Java project, I automatized toString method. For almost
all my classes, toString method is just a one line of code:

    @Override public String toString()
    {
        return ToStringBuilder.objectToStringInOneLine(this);
    }

.... where ToStringBuilder class is a static util class using
org.apache.commons.lang.builder.ReflectionToStringBuilder:

public class ToStringBuilder
{
    public static String objectToStringInOneLine(final Object obj)
    {
        final String str = ToStringBuilder.objectToString(obj,
ToStringStyle.SHORT_PREFIX_STYLE);
        return str;
    }

    public static String objectToString(final Object obj, final
ToStringStyle toStringStyle)
    {
        return doObjectToString(obj, null, toStringStyle);
    }

        // ...

    private static String doObjectToString(
          final Object obj
        , final String[] excludeFieldNamesParam // can be null.
        , final ToStringStyle toStringStyle
        )
    {
        final ReflectionToStringBuilder rtsb =
            new ReflectionToStringBuilder(obj, toStringStyle)
            { /* empty block */ };

        if(excludeFieldNamesParam != null)
            rtsb.setExcludeFieldNames(excludeFieldNamesParam);

        return rtsb.toString();
    }
}

Of course there *must* be a way to obtain arguments names and their
(runtime) values because all Java debuggers can *see* those things
when I'm standing on a breakpoint in Debug mode.

Thanks!
Adam Wozniak

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