sjm.examples.string
Class StringFunction

java.lang.Object
  |
  +--sjm.examples.string.StringFunction

Direct Known Subclasses:

Identity, LowerCase, Substring, Trim, UpperCase

public abstract class StringFunction

extends java.lang.Object

A StringFunction implements the method f() to accept a string, apply a function to it, and return a string. This class is abstract, and each subclass represents a different function to apply. The functions wrap each other, to allow runtime composition of new functions.

Field Summary

protected StringFunction

source

Constructor Summary

StringFunction()
Construct a function whose source function is identity, which does not change a string.

StringFunction(StringFunction source)
Construct a function whose source is the given function.

Method Summary

abstract java.lang.String

f(java.lang.String s) Each subclass should implement this method in manner that applies a function to the input string.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

source

protected StringFunction source

Constructor Detail

StringFunction

public StringFunction()

Construct a function whose source function is identity, which does not change a string.

StringFunction

public StringFunction(StringFunction source)

Construct a function whose source is the given function.

Method Detail

f

public abstract java.lang.String f(java.lang.String s)

Each subclass should implement this method in manner that applies a function to the input string. The class name should represent the function applied here.