Make sure your code in a proper try and catch. Using reflection spits out nasty errors if anything is not right.:(
ClassCastException IllegalAccessException NoSuchMethodException InvocationTargetException Daniel jaffa ----- Original Message ----- From: "Jerry Jalenak" <[EMAIL PROTECTED]> To: "'Struts Users Mailing List'" <[EMAIL PROTECTED]> Sent: Monday, September 30, 2002 11:46 AM Subject: RE: [OT - Java] How can I do this in Java? > Jason - Thanks for the code snippet - worked like a charm first time! I > tend to get lost in JavaDoc sometimes, so this was a nice example to have on > how to wind my way through to the answer! Thanks again! > > John - Thanks for the suggestion on using the HashMap. I'm going to file it > away for now and use Jason's reflection method - but it never hurts to have > a couple of different methods to use on something like this! > > Thanks guys! > > Jerry > > > -----Original Message----- > > From: Taylor, Jason [mailto:[EMAIL PROTECTED]] > > Sent: Monday, September 30, 2002 10:28 AM > > To: 'Struts Users Mailing List' > > Subject: RE: [OT - Java] How can I do this in Java? > > > > > > I don't happen to have any sample code that does exactly what > > you're doing, > > but off the top of my head (with a little help from sun's > > javadoc) I'd say > > it's something like: > > > > import java.lang.reflect.Field; > > > > String stateCode = "AK"; > > Class constantClass = > > Class.forName("com.yourdomain.yourapp.Constants"); > > Field stateField = constantClass.getDeclaredField(stateCode); > > String stateRegExp = (String) stateField.get(constantClass); > > System.err.println("regexp for "+stateCode+": "+stateRegExp); > > > > I don't really know any more about reflection than you, I > > just followed the > > trail from java.lang.Class to java.lang.reflect.Field. Once > > you've done it > > once, you see it's no mystery-- you're just doing runtime compiling. > > > > HTH-- This is just how I'd start, as I haven't tested or used > > this code. If > > I'm wrong, I'm sure you can figure out what I missed by > > studying the API > > docs. If, on the other hand, you don't like reading javadocs > > and generating > > your own test cases, LOL! > > > > -JT > > > > -----Original Message----- > > From: Jerry Jalenak [mailto:[EMAIL PROTECTED]] > > Sent: Monday, September 30, 2002 8:05 AM > > To: 'Struts Users Mailing List' > > Subject: RE: [OT - Java] How can I do this in Java? > > > > > > Jason, > > > > Thanks for the quick reply. I just took at look at the > > API's, but don't yet > > understand enough about reflection to know how to implement it. Just > > looking at the methods I don't see a way to do what I want - > > any chance that > > you'd have some sample code laying about? > > > > Jerry > > > > > -----Original Message----- > > > From: Taylor, Jason [mailto:[EMAIL PROTECTED]] > > > Sent: Monday, September 30, 2002 9:59 AM > > > To: 'Struts Users Mailing List' > > > Subject: RE: [OT - Java] How can I do this in Java? > > > > > > > > > sounds like a job for reflection (java.lang.reflect.*;) Have > > > you looked at > > > java.lang.Class and java.lang.reflect.Field? > > > > > > -----Original Message----- > > > From: Jerry Jalenak [mailto:[EMAIL PROTECTED]] > > > Sent: Monday, September 30, 2002 7:50 AM > > > To: '[EMAIL PROTECTED]' > > > Subject: [OT - Java] How can I do this in Java? > > > > > > > > > OK - off topic, but Sun's java forum sucks, and there are an > > > incredible > > > number of Java guru's on this list, so I thought I'd throw > > > this out here. > > > (That and I am using this in a custom validation routine > > > :-)) Any help > > > would be GREATLY appreciated! > > > > > > Here's the scenario - I've got a series of static constants > > > that represent > > > Java regular expressions. These RE's are used to validate > > > driver license > > > formats for the 50 states + DC. The strings look like this: > > > > > > public static final String AK = "^[0-9]{1,7}$"; > > > public static final String AL = "^[0-9]{7}$"; > > > public static final String AR = "^[0-9]{8,9}$"; > > > public static final String AZ = > > > "^[0-9ABDY][0-9]{8}$|^[A-Z][0-9]{3,6}$|^[A-Z]{2}[0-9]{3,5}$"; > > > public static final String CA = "^[A-Z][0-9]{4,7}$"; > > > public static final String CO = > > > "^[A-Z][0-9]{1,6}$|^[A-Z]{2}[0-9]{1,6}$|^[0-9]{9}$"; > > > etc. etc. etc. > > > > > > On my form I have a drop-down box of states, and a field for > > > the license > > > number. In my custom validator routine, I pick up the value > > > of the state, > > > and build a string to represent the constant - i.e. > > > > > > private static boolean validateDriversLicenseNumber(String > > > licenseState, String licenseNumber) > > > { > > > String licenseConstant = "Constants." + licenseState; > > > > > > I then want to use "licenseConstant" in a Pattern / Match: > > > > > > Pattern p = Pattern.compile(licenseConstant, > > > Pattern.CASE_INSENSITIVE); > > > Match m = p.matcher(licenseNumber); > > > return (m.find()); > > > } > > > > > > Obviously the line "String licenseConstant = "Constants." + > > > licenseState;" > > > does not give me the value of Constant.<state name>; the > > > question I have is, > > > is there a method (or something) that will allow me to build > > > such a string, > > > and return the value (i.e. the regular expression)? Or is > > > there a better > > > way of doing this? > > > > > > TIA! > > > > > > Jerry Jalenak > > > Web Publishing > > > LabOne, Inc. > > > 10101 Renner Blvd. > > > Lenexa, KS 66219 > > > (913) 577-1496 > > > [EMAIL PROTECTED] > > > > > > > > > This transmission (and any information attached to it) may be > > > confidential > > > and is intended solely for the use of the individual or > > > entity to which it > > > is addressed. If you are not the intended recipient or the person > > > responsible for delivering the transmission to the intended > > > recipient, be > > > advised that you have received this transmission in error and > > > that any use, > > > dissemination, forwarding, printing, or copying of this > > information is > > > strictly prohibited. If you have received this transmission > > > in error, please > > > immediately notify LabOne at (800)388-4675. > > > > > > > > > > > > -- > > > To unsubscribe, e-mail: > > > <mailto:[EMAIL PROTECTED]> > > > For additional commands, e-mail: > > > <mailto:[EMAIL PROTECTED]> > > > > > > > This transmission (and any information attached to it) may be > > confidential > > and is intended solely for the use of the individual or > > entity to which it > > is addressed. If you are not the intended recipient or the person > > responsible for delivering the transmission to the intended > > recipient, be > > advised that you have received this transmission in error and > > that any use, > > dissemination, forwarding, printing, or copying of this information is > > strictly prohibited. If you have received this transmission > > in error, please > > immediately notify LabOne at (800)388-4675. > > > > > > > > -- > > To unsubscribe, e-mail: > > <mailto:[EMAIL PROTECTED]> > > For additional commands, e-mail: > > <mailto:[EMAIL PROTECTED]> > > > > This transmission (and any information attached to it) may be confidential and is intended solely for the use of the individual or entity to which it is addressed. If you are not the intended recipient or the person responsible for delivering the transmission to the intended recipient, be advised that you have received this transmission in error and that any use, dissemination, forwarding, printing, or copying of this information is strictly prohibited. If you have received this transmission in error, please immediately notify LabOne at (800)388-4675. > > > > -- > To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> > For additional commands, e-mail: <mailto:[EMAIL PROTECTED]> > -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
