monq.jfa.actions

Class DefaultAction

java.lang.Object

monq.jfa.actions.DefaultAction

All Implemented Interfaces:

FaAction

public class DefaultAction
extends java.lang.Object
implements FaAction

provides an action that always returns the other action from mergeWith(monq.jfa.FaAction). The intention is that this never survives in a DFA compilation. Should it do nevertheless, the default action is called in case this is called.

Constructor Summary

Constructors

Constructor and Description
DefaultAction(FaAction dflt)

Method Summary

Modifier and Type	Method and Description
void	invoke(java.lang.StringBuilder yytext, int start, DfaRun runner) is called by methods of DfaRun in case of a match.
FaAction	mergeWith(FaAction other) always returns other.
static DefaultAction	nullInstance() returns an instance with no default.
java.lang.String	toString()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

DefaultAction

public DefaultAction(FaAction dflt)

Method Detail

nullInstance

public static DefaultAction nullInstance()

returns an instance with no default. It should only be used to implement operations on automata. If this action is hit during operation of an automaton, it will result in an NullPointerException.

invoke

public void invoke(java.lang.StringBuilder yytext,
                   int start,
                   DfaRun runner)
            throws CallbackException

Description copied from interface: FaAction

is called by methods of DfaRun in case of a match. Parameter yytext contains the matching text from position start onwards. The callback may change the whole of yytext, but the under most circumstances, only the matching text should be changed. Parameter runner is the DfaRun object which called this function. Of interest are its fields DfaRun.clientData and DfaRun.collect.

Specified by:

invoke in interface FaAction

Throws:

CallbackException

mergeWith

public FaAction mergeWith(FaAction other)

always returns other.

Specified by:

mergeWith in interface FaAction

Parameters:

other - will never be null.

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object