edu.stanford.nlp.trees
Class NullLabel

java.lang.Object
  |
  +--edu.stanford.nlp.trees.AbstractLabel
        |
        +--edu.stanford.nlp.trees.NullLabel

All Implemented Interfaces:

Comparable, HasCategory, HasTag, HasWord, Label

public class NullLabel

extends AbstractLabel

implements HasWord, HasTag, HasCategory

A NullLabel object acts as a Label with linguistic attributes, but doesn't actually store or return anything. It returns null to any requests. Designed to be extended.

Constructor Summary

NullLabel()

Method Summary

String	category() Return the category value of the label (or null if none).
static LabelFactory	factory() Return a factory for this kind of label.
LabelFactory	labelFactory() Return a factory for this kind of label.
void	setCategory(String category) Set the category value for the label (if one is stored).
void	setTag(String tag) Set the tag value for the label (if one is stored).
void	setWord(String word) Set the word value for the label (if one is stored).
String	tag() Return the tag value of the label (or null if none).
String	word() Return the word value of the label (or null if none).

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

compareTo, equals, hashCode, setFromString, setValue, toString, value

Methods inherited from class java.lang.Object

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

Constructor Detail

NullLabel

public NullLabel()

Method Detail

word

public String word()

Description copied from interface: HasWord

Return the word value of the label (or null if none).

Specified by:

word in interface HasWord

Returns:

String the word value for the label

setWord

public void setWord(String word)

Description copied from interface: HasWord

Set the word value for the label (if one is stored).

Specified by:

setWord in interface HasWord

Parameters:

word - The word value for the label

tag

public String tag()

Description copied from interface: HasTag

Return the tag value of the label (or null if none).

Specified by:

tag in interface HasTag

Returns:

String the tag value for the label

setTag

public void setTag(String tag)

Description copied from interface: HasTag

Set the tag value for the label (if one is stored).

Specified by:

setTag in interface HasTag

Parameters:

tag - The tag value for the label

category

public String category()

Description copied from interface: HasCategory

Return the category value of the label (or null if none).

Specified by:

category in interface HasCategory

Returns:

String the category value for the label

setCategory

public void setCategory(String category)

Description copied from interface: HasCategory

Set the category value for the label (if one is stored).

Specified by:

setCategory in interface HasCategory

labelFactory

public LabelFactory labelFactory()

Return a factory for this kind of label. (I.e., NullLabel.) The factory returned is always the same one (a singleton).

Specified by:

labelFactory in interface Label

Specified by:

labelFactory in class AbstractLabel

Returns:

The label factory

factory

public static LabelFactory factory()

Return a factory for this kind of label.

Returns:

The label factory