Package opennlp.tools.util

Class Span

java.lang.Object

opennlp.tools.util.Span

All Implemented Interfaces:

Serializable, Comparable<Span>

Direct Known Subclasses:

LinkedSpan, MascSentence, MascToken, MascWord

public class Span
extends Object
implements Comparable<Span>, Serializable

Class for storing start and end integer offsets.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor	Description
Span(int s, int e)	Initializes a new Span Object.
Span(int s, int e, double prob)
Span(int s, int e, String type)	Initializes a new Span Object.
Span(int s, int e, String type, double prob)	Initializes a new Span Object.
Span(Span span, double prob)	Creates a new immutable span based on an existing span, where the existing span did not include the prob
Span(Span span, int offset)	Initializes a new Span object with an existing Span which is shifted by an offset.

Method Summary

Modifier and Type	Method	Description
int	compareTo(Span s)	Compares the specified span to the current span.
boolean	contains(int index)	Returns true if the specified index is contained inside this span.
boolean	contains(Span s)	Returns true if the specified span is contained by this span.
boolean	crosses(Span s)	Returns true is the specified span crosses this span.
boolean	equals(Object o)	Checks if the specified span is equal to the current span.
CharSequence	getCoveredText(CharSequence text)	Retrieves the string covered by the current span of the specified text.
int	getEnd()	Return the end of a span.
double	getProb()
int	getStart()	Return the start of a span.
String	getType()	Retrieves the type of the span.
int	hashCode()	Generates a hash code of the current span.
boolean	intersects(Span s)	Returns true if the specified span intersects with this span.
int	length()	Returns the length of this span.
static String[]	spansToStrings(Span[] spans, CharSequence s)	Converts an array of Spans to an array of Strings.
static String[]	spansToStrings(Span[] spans, String[] tokens)
boolean	startsWith(Span s)	Returns true if the specified span is the begin of this span and the specified span is contained in this span.
String	toString()	Generates a human readable string.
Span	trim(CharSequence text)	Return a copy of this span with leading and trailing white spaces removed.

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

Span

public Span(int s,
            int e,
            String type)

Initializes a new Span Object. Sets the prob to 0 as default.

Parameters:

s - start of span.

e - end of span, which is +1 more than the last element in the span.

type - the type of the span

Span

public Span(int s,
            int e,
            String type,
            double prob)

Initializes a new Span Object.

Parameters:

s - start of span.

e - end of span, which is +1 more than the last element in the span.

type - the type of the span

prob - probability of span.

Span

public Span(int s,
            int e)

Initializes a new Span Object. Sets the prob to 0 as default

Parameters:

s - start of span.

e - end of span.

Span

public Span(int s,
            int e,
            double prob)

Parameters:

s - the start of the span (the token index, not the char index)

e - the end of the span (the token index, not the char index)

prob -

Span

public Span(Span span,
            int offset)

Initializes a new Span object with an existing Span which is shifted by an offset.

Parameters:

span -

offset -

Span

public Span(Span span,
            double prob)

Creates a new immutable span based on an existing span, where the existing span did not include the prob

Parameters:

span - the span that has no prob or the prob is incorrect and a new Span must be generated

prob - the probability of the span

Method Detail

getStart

public int getStart()

Return the start of a span.

Returns:

the start of a span.

getEnd

public int getEnd()

Return the end of a span. Note: that the returned index is one past the actual end of the span in the text, or the first element past the end of the span.

Returns:

the end of a span.

getType

public String getType()

Retrieves the type of the span.

Returns:

the type or null if not set

length

public int length()

Returns the length of this span.

Returns:

the length of the span.

contains

public boolean contains(Span s)

Returns true if the specified span is contained by this span. Identical spans are considered to contain each other.

Parameters:

s - The span to compare with this span.

Returns:

true is the specified span is contained by this span; false otherwise.

contains

public boolean contains(int index)

Returns true if the specified index is contained inside this span. An index with the value of end is considered outside the span.

Parameters:

index - the index to test with this span.

Returns:

true if the span contains this specified index; false otherwise.

startsWith

public boolean startsWith(Span s)

Returns true if the specified span is the begin of this span and the specified span is contained in this span.

Parameters:

s - The span to compare with this span.

Returns:

true if the specified span starts with this span and is contained in this span; false otherwise

intersects

public boolean intersects(Span s)

Returns true if the specified span intersects with this span.

Parameters:

s - The span to compare with this span.

Returns:

true is the spans overlap; false otherwise.

crosses

public boolean crosses(Span s)

Returns true is the specified span crosses this span.

Parameters:

s - The span to compare with this span.

Returns:

true is the specified span overlaps this span and contains a non-overlapping section; false otherwise.

getCoveredText

public CharSequence getCoveredText(CharSequence text)

Retrieves the string covered by the current span of the specified text.

Parameters:

text -

Returns:

the substring covered by the current span

trim

public Span trim(CharSequence text)

Return a copy of this span with leading and trailing white spaces removed.

Parameters:

text -

Returns:

the trimmed span or the same object if already trimmed

compareTo

public int compareTo(Span s)

Compares the specified span to the current span.

Specified by:

compareTo in interface Comparable<Span>

hashCode

public int hashCode()

Generates a hash code of the current span.

Overrides:

hashCode in class Object

equals

public boolean equals(Object o)

Checks if the specified span is equal to the current span.

Overrides:

equals in class Object

toString

public String toString()

Generates a human readable string.

Overrides:

toString in class Object

spansToStrings

public static String[] spansToStrings(Span[] spans,
                                      CharSequence s)

Converts an array of Spans to an array of Strings.

Parameters:

spans -

s -

Returns:

the strings

spansToStrings

public static String[] spansToStrings(Span[] spans,
                                      String[] tokens)

getProb

public double getProb()