org.antlr.analysis

Class Transition

java.lang.Object

org.antlr.analysis.Transition

All Implemented Interfaces:

Comparable

Direct Known Subclasses:

RuleClosureTransition

public class Transition
extends Object
implements Comparable

A generic transition between any two state machine states. It defines some special labels that indicate things like epsilon transitions and that the label is actually a set of labels or a semantic predicate. This is a one way link. It emanates from a state (usually via a list of transitions) and has a label/target pair. I have abstracted the notion of a Label to handle the various kinds of things it can be.

Field Summary

Fields

Modifier and Type	Field and Description
Label	label What label must be consumed to transition to target
State	target The target of this transition

Constructor Summary

Constructors

Constructor and Description
Transition(int label, State target)
Transition(Label label, State target)

Method Summary

Methods

Modifier and Type	Method and Description
int	compareTo(Object o)
boolean	equals(Object o)
int	hashCode()
boolean	isAction()
boolean	isEpsilon()
boolean	isSemanticPredicate()
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

label

public Label label

What label must be consumed to transition to target

target

public State target

The target of this transition

Constructor Detail

Transition

public Transition(Label label,
          State target)

Transition

public Transition(int label,
          State target)

Method Detail

isEpsilon

public boolean isEpsilon()

isAction

public boolean isAction()

isSemanticPredicate

public boolean isSemanticPredicate()

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object o)

Overrides:

equals in class Object

compareTo

public int compareTo(Object o)

Specified by:

compareTo in interface Comparable

toString

public String toString()

Overrides:

toString in class Object