edu.stanford.nlp.ling

Class StringLabel

java.lang.Object

edu.stanford.nlp.ling.ValueLabel

edu.stanford.nlp.ling.StringLabel

All Implemented Interfaces:

HasOffset, Label, java.io.Serializable, java.lang.Comparable<ValueLabel>

Direct Known Subclasses:

CategoryWordTag, NegraLabel, Tag, Word

public class StringLabel
extends ValueLabel
implements HasOffset

A StringLabel object acts as a Label by containing a single String, which it sets or returns in response to requests. The hashCode() and compareTo() methods for this class assume that this string value is non-null. equals() is correctly implemented

Version:

2000/12/20

Author:

Christopher Manning

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
StringLabel() Create a new StringLabel with a null content (i.e., str).
StringLabel(Label label) Create a new StringLabel with the value() of another label as its label.
StringLabel(java.lang.String str) Create a new StringLabel with the given content.
StringLabel(java.lang.String str, int beginPosition, int endPosition) Create a new StringLabel with the given content.

Method Summary

Modifier and Type	Method and Description
int	beginPosition() Return the beginning char offset of the label (or -1 if none).
int	endPosition() Return the ending char offset of the label (or -1 if none).
static LabelFactory	factory() Return a factory for this kind of label.
LabelFactory	labelFactory() Return a factory for this kind of label (i.e., StringLabel).
void	setBeginPosition(int beginPosition) Set the beginning character offset for the label.
void	setEndPosition(int endPosition) Set the ending character offset of the label (or -1 if none).
void	setFromString(java.lang.String str) Set the label from a String.
void	setValue(java.lang.String value) Set the value for the label.
java.lang.String	toString() Return a string representation of the label.
java.lang.String	value() Return the word value of the label (or null if none).

Methods inherited from class edu.stanford.nlp.ling.ValueLabel

compareTo, equals, hashCode

Methods inherited from class java.lang.Object

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

Constructor Detail

StringLabel

public StringLabel()

Create a new StringLabel with a null content (i.e., str).

StringLabel

public StringLabel(java.lang.String str)

Create a new StringLabel with the given content.

Parameters:

str - The new label's content

StringLabel

public StringLabel(java.lang.String str,
                   int beginPosition,
                   int endPosition)

Create a new StringLabel with the given content.

Parameters:

str - The new label's content

beginPosition - Start offset in original text

endPosition - End offset in original text

StringLabel

public StringLabel(Label label)

Create a new StringLabel with the value() of another label as its label.

Parameters:

label - The other label

Method Detail

value

public java.lang.String value()

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

Specified by:

value in interface Label

Overrides:

value in class ValueLabel

Returns:

String the word value for the label

setValue

public void setValue(java.lang.String value)

Set the value for the label.

Specified by:

setValue in interface Label

Overrides:

setValue in class ValueLabel

Parameters:

value - The value for the label

setFromString

public void setFromString(java.lang.String str)

Set the label from a String.

Specified by:

setFromString in interface Label

Overrides:

setFromString in class ValueLabel

Parameters:

str - The str for the label

toString

public java.lang.String toString()

Description copied from class: ValueLabel

Return a string representation of the label. This will just be the value() if it is non-null, and the empty string otherwise.

Specified by:

toString in interface Label

Overrides:

toString in class ValueLabel

Returns:

The string representation

labelFactory

public LabelFactory labelFactory()

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

Specified by:

labelFactory in interface Label

Specified by:

labelFactory in class ValueLabel

Returns:

The label factory

factory

public static LabelFactory factory()

Return a factory for this kind of label.

Returns:

The label factory

beginPosition

public int beginPosition()

Description copied from interface: HasOffset

Return the beginning char offset of the label (or -1 if none). Note that these are currently measured in terms of UTF-16 char offsets, not codepoints, so that when non-BMP Unicode characters are present, such a character will add 2 to the position. On the other hand, these values will work with String#substring() and you can then calculate the number of codepoints in a substring.

Specified by:

beginPosition in interface HasOffset

Returns:

the beginning position for the label

endPosition

public int endPosition()

Description copied from interface: HasOffset

Return the ending char offset of the label (or -1 if none). As usual in Java, this is the offset of the char after this token. Note that these are currently measured in terms of UTF-16 char offsets, not codepoints, so that when non-BMP Unicode characters are present, such a character will add 2 to the position. On the other hand, these values will work with String#substring() and you can then calculate the number of codepoints in a substring.

Specified by:

endPosition in interface HasOffset

Returns:

the end position for the label

setBeginPosition

public void setBeginPosition(int beginPosition)

Description copied from interface: HasOffset

Set the beginning character offset for the label. Setting this key to "-1" can be used to indicate no valid value.

Specified by:

setBeginPosition in interface HasOffset

Parameters:

beginPosition - The beginning position

setEndPosition

public void setEndPosition(int endPosition)

Description copied from interface: HasOffset

Set the ending character offset of the label (or -1 if none).

Specified by:

setEndPosition in interface HasOffset

Parameters:

endPosition - The end character offset for the label