Interface PositionIncrementAttribute
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- All Superinterfaces:
Attribute
- All Known Implementing Classes:
PositionIncrementAttributeImpl
,Token
public interface PositionIncrementAttribute extends Attribute
Determines the position of this token relative to the previous Token in a TokenStream, used in phrase searching.The default value is one.
Some common uses for this are:
- Set it to zero to put multiple terms in the same position. This is useful if, e.g., a word has multiple stems. Searches for phrases including either stem will match. In this case, all but the first stem's increment should be set to zero: the increment of the first instance should be one. Repeating a token with an increment of zero can also be used to boost the scores of matches on that token.
- Set it to values greater than one to inhibit exact phrase matches. If, for example, one does not want phrases to match across removed stop words, then one could build a stop word filter that removes stop words and also sets the increment to the number of stop words removed before each non-stop word. Then exact phrase queries will only match when the terms occur with no intervening stop words.
- See Also:
DocsAndPositionsEnum
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description int
getPositionIncrement()
Returns the position increment of this Token.void
setPositionIncrement(int positionIncrement)
Set the position increment.
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Method Detail
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setPositionIncrement
void setPositionIncrement(int positionIncrement)
Set the position increment. The default value is one.- Parameters:
positionIncrement
- the distance from the prior term- Throws:
java.lang.IllegalArgumentException
- ifpositionIncrement
is negative.- See Also:
getPositionIncrement()
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getPositionIncrement
int getPositionIncrement()
Returns the position increment of this Token.- See Also:
setPositionIncrement(int)
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