com.yahoo.prelude.query

Class WordAlternativesItem

java.lang.Object

com.yahoo.prelude.query.Item

com.yahoo.prelude.query.SimpleTaggableItem

com.yahoo.prelude.query.SimpleIndexedItem

com.yahoo.prelude.query.TermItem

com.yahoo.prelude.query.WordAlternativesItem

All Implemented Interfaces:

BlockItem, HasIndexItem, IndexedItem, TaggableItem, Cloneable

public class WordAlternativesItem
extends TermItem

A set words with differing exactness scores to be used for literal boost ranking.

Author:

Steinar Knutsen

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	WordAlternativesItem.Alternative

Nested classes/interfaces inherited from class com.yahoo.prelude.query.Item

Item.ItemCreator, Item.ItemType

Field Summary

Fields

Modifier and Type	Field and Description
private List<WordAlternativesItem.Alternative>	alternatives
private int	maxIndex

Fields inherited from class com.yahoo.prelude.query.Item

connectedBacklink, connectedItem, connectivity, DEFAULT_WEIGHT, explicitSignificance, significance, uniqueID

Constructor Summary

Constructors

Constructor and Description
WordAlternativesItem(String indexName, boolean isFromQuery, Substring origin, Collection<WordAlternativesItem.Alternative> terms)

Method Summary

Modifier and Type	Method and Description
void	addTerm(String term, double exactness) Add a new alternative iff the term string is not already present with an equal or higher exactness score.
void	encodeThis(ByteBuffer target)
List<WordAlternativesItem.Alternative>	getAlternatives() Return an immutable snapshot of the contained terms.
String	getIndexedString() Return the searchable term contents of this item.
Item.ItemType	getItemType() Return the enumerated type of this item.
String	getName() Returns the name of this item
int	getNumWords()
String	getRawWord() Returns the raw form of the text leading to this term, exactly as received, including original casing
boolean	isStemmed()
boolean	isWords() Does this item represent "usual words"?
void	setAlternatives(Collection<WordAlternativesItem.Alternative> terms)
private void	setMaxIndex()
void	setValue(String value) Sets the value of this item from a string.
String	stringValue() Returns the value of this term as a string
private static com.google.common.collect.ImmutableList<WordAlternativesItem.Alternative>	uniqueAlternatives(Collection<WordAlternativesItem.Alternative> terms)

Methods inherited from class com.yahoo.prelude.query.TermItem

appendBodyString, disclose, encode, getOrigin, getSegmentingRule, getTermCount, isFromQuery, isNormalizable, setNormalizable, setOrigin, setSegmentingRule

Methods inherited from class com.yahoo.prelude.query.SimpleIndexedItem

appendIndexString, equals, getIndexName, hashCode, setIndexName

Methods inherited from class com.yahoo.prelude.query.SimpleTaggableItem

getConnectedItem, getConnectivity, getSignificance, getUniqueID, hasExplicitSignificance, hasUniqueID, setConnectivity, setExplicitSignificance, setSignificance, setUniqueID

Methods inherited from class com.yahoo.prelude.query.Item

addAnnotation, appendHeadingString, clone, getAnnotation, getBytes, getCode, getCreator, getLabel, getLanguage, getParent, getWeight, hasAnnotation, hasConnectivityBackLink, isFilter, isFromSpecialToken, isProtected, isRanked, isRoot, putBytes, putString, setCreator, setFilter, setFromSpecialToken, setHasUniqueID, setLabel, setLanguage, setParent, setPositionData, setProtected, setRanked, setWeight, shouldParenthize, toString, usePositionData

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.yahoo.prelude.query.HasIndexItem

getIndexName

Field Detail

alternatives

private List<WordAlternativesItem.Alternative> alternatives

maxIndex

private int maxIndex

Constructor Detail

WordAlternativesItem

public WordAlternativesItem(String indexName,
                            boolean isFromQuery,
                            Substring origin,
                            Collection<WordAlternativesItem.Alternative> terms)

Method Detail

setAlternatives

public void setAlternatives(Collection<WordAlternativesItem.Alternative> terms)

uniqueAlternatives

private static com.google.common.collect.ImmutableList<WordAlternativesItem.Alternative> uniqueAlternatives(Collection<WordAlternativesItem.Alternative> terms)

setMaxIndex

private void setMaxIndex()

stringValue

public String stringValue()

Description copied from interface: BlockItem

Returns the value of this term as a string

isStemmed

public boolean isStemmed()

getNumWords

public int getNumWords()

setValue

public void setValue(String value)

Description copied from class: TermItem

Sets the value of this item from a string.

Specified by:

setValue in class TermItem

getRawWord

public String getRawWord()

Description copied from class: TermItem

Returns the raw form of the text leading to this term, exactly as received, including original casing

Specified by:

getRawWord in interface BlockItem

Specified by:

getRawWord in class TermItem

isWords

public boolean isWords()

Description copied from interface: BlockItem

Does this item represent "usual words"?

Specified by:

isWords in interface BlockItem

Specified by:

isWords in class TermItem

getIndexedString

public String getIndexedString()

Description copied from interface: IndexedItem

Return the searchable term contents of this item.

Specified by:

getIndexedString in interface IndexedItem

Specified by:

getIndexedString in class SimpleIndexedItem

Returns:

a string representation of what is presumably stored in an index which will match this item

getItemType

public Item.ItemType getItemType()

Description copied from class: Item

Return the enumerated type of this item.

Specified by:

getItemType in class Item

getName

public String getName()

Description copied from class: Item

Returns the name of this item

Specified by:

getName in class Item

getAlternatives

public List<WordAlternativesItem.Alternative> getAlternatives()

Return an immutable snapshot of the contained terms. This list will not reflect later changes to the item.

Returns:

an immutable list of word alternatives and their respective scores

encodeThis

public void encodeThis(ByteBuffer target)

Overrides:

encodeThis in class SimpleIndexedItem

addTerm

public void addTerm(String term,
                    double exactness)

Add a new alternative iff the term string is not already present with an equal or higher exactness score. If the term string is present with a lower exactness score, the new, higher score will take precedence.

Parameters:

term - one of several string interpretations of the input word

exactness - how close the term string matches what the user input