UdtLib.Alphanum (Java APG)

java.lang.Object
- apg.Parser.UdtCallback
- - apg.UdtLib.Alphanum

Enclosing class:

UdtLib
```
public static class UdtLib.Alphanum
extends Parser.UdtCallback
```
UDT for recognizing alpha-numeric phrases. Alpha-numeric phrases begin with an alphabetic character a-z or A-Z. Characters after the first may be alphabetic or numeric, 0-9.

Field Summary
- Fields inherited from class apg.Parser.UdtCallback
  callbackData

Constructor Summary

Constructors
Constructor	Description
`Alphanum(Parser p)`	Default constructor.
`Alphanum(Parser p, char otherChar)`	Constructor defining one other character which is allowed in addition to alpha-numeric after the first.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type Method Description

int callback(int offset)
The UDT function.
- Methods inherited from class java.lang.Object
  equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - Alphanum
```
public Alphanum(Parser p)
```
    Default constructor.
    
    Parameters:
    
    p - the Parser object the UDT is attached to.
  - Alphanum
```
public Alphanum(Parser p,
                char otherChar)
```
    Constructor defining one other character which is allowed in addition to alpha-numeric after the first.
    
    Parameters:
    
    p - the Parser object the UDT is attached to.
    
    otherChar - the other character to allow.
- Method Detail
  - callback
```
public int callback(int offset)
```
    Description copied from class: Parser.UdtCallback
    
    The UDT function.
    
    Specified by:
    
    callback in class Parser.UdtCallback
    
    Parameters:
    
    offset - offset into the input string to the first character of the parsed phrase.
    
    Returns:
    
    the matched phrase length, L, or -1 if no phrase was matched. The phrase length must be in the range 0 <= L <=(n-1), where n is the remaining number of characters in the input string.