edu.stanford.nlp.trees

Class Span

java.lang.Object

edu.stanford.nlp.trees.Constituent

edu.stanford.nlp.trees.SimpleConstituent

edu.stanford.nlp.trees.Span

All Implemented Interfaces:

Label, Labeled, Scored

public final class Span
extends SimpleConstituent

A Span is an optimized SimpleConstituent object. It provides exactly the same functionality as a SimpleConstituent, but by being final, and with its own implementation of Span equality, it runs faster, so as to placate Dan Klein. (With JDK1.3 client, it still doesn't run as fast as an implementation outside of the SimpleConstituent hierarchy, but with JDK1.3 server, it does! And both versions are several times faster with -server than -client, so that should be used.)

Author:

Christopher Manning

Constructor Summary

Constructors

Constructor and Description
Span() Create an empty Span object.
Span(int start, int end) Create a Span object with given values.

Method Summary

Modifier and Type	Method and Description
ConstituentFactory	constituentFactory() Return a factory for this kind of constituent.
boolean	equals(Span sp) An overloading for efficiency for when you know that you're comparing with a Span.
static ConstituentFactory	factory() Return a factory for this kind of constituent.

Methods inherited from class edu.stanford.nlp.trees.SimpleConstituent

end, labelFactory, setEnd, setStart, start

Methods inherited from class edu.stanford.nlp.trees.Constituent

contains, crosses, crosses, equals, hashCode, label, labels, score, setFromString, setLabel, setLabels, setScore, setValue, size, toSentenceString, toString, value

Methods inherited from class java.lang.Object

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

Constructor Detail

Span

public Span()

Create an empty Span object.

Span

public Span(int start,
            int end)

Create a Span object with given values.

Parameters:

start - start node of edge

end - end node of edge

Method Detail

equals

public boolean equals(Span sp)

An overloading for efficiency for when you know that you're comparing with a Span.

Parameters:

sp - the span to compare against

Returns:

whether they have the same start and end

See Also:

Constituent.equals(Object)

constituentFactory

public ConstituentFactory constituentFactory()

Return a factory for this kind of constituent. The factory returned is always the same one (a singleton).

Overrides:

constituentFactory in class SimpleConstituent

Returns:

The constituent factory

factory

public static ConstituentFactory factory()

Return a factory for this kind of constituent. The factory returned is always the same one (a singleton).

Returns:

The constituent factory