org.sindice.siren.search.node

Class NodeConstantScoreQuery

java.lang.Object

org.apache.lucene.search.Query

org.sindice.siren.search.node.NodeQuery

org.sindice.siren.search.node.NodePrimitiveQuery

org.sindice.siren.search.node.NodeConstantScoreQuery

All Implemented Interfaces:

Cloneable

public class NodeConstantScoreQuery
extends NodePrimitiveQuery

A query that wraps another query or a filter and simply returns a constant score equal to the query boost for every nodes that matches the filter or query. For queries it therefore simply strips of all scores and returns a constant one.

Code taken from ConstantScoreQuery and adapted for the siren use case.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected class	NodeConstantScoreQuery.NodeConstantScorer
protected class	NodeConstantScoreQuery.NodeConstantWeight

Field Summary

Fields

Modifier and Type	Field and Description
protected org.apache.lucene.search.Filter	filter
protected NodeQuery	query

Fields inherited from class org.sindice.siren.search.node.NodePrimitiveQuery

datatype

Fields inherited from class org.sindice.siren.search.node.NodeQuery

ancestor, levelConstraint, lowerBound, upperBound

Constructor Summary

Constructors

Constructor and Description
NodeConstantScoreQuery(NodeQuery query) Strips off scores from the passed in Query.

Method Summary

Methods

Modifier and Type	Method and Description
org.apache.lucene.search.Weight	createWeight(org.apache.lucene.search.IndexSearcher searcher)
boolean	equals(Object o)
void	extractTerms(Set<org.apache.lucene.index.Term> terms)
NodeQuery	getQuery() Returns the encapsulated query, returns null if a filter is wrapped.
int	hashCode()
NodeQuery	rewrite(org.apache.lucene.index.IndexReader reader)
protected void	setAncestorPointer(NodeQuery ancestor) Expert: Add a pointer to the node query ancestor
void	setLevelConstraint(int levelConstraint) Set a constraint on the node's level
void	setNodeConstraint(int lowerBound, int upperBound) Set an index interval constraint for a node.
String	toString(String field)

Methods inherited from class org.sindice.siren.search.node.NodePrimitiveQuery

setDatatype, wrapToStringWithDatatype

Methods inherited from class org.sindice.siren.search.node.NodeQuery

getDocsNodesAndPositionsEnum, getLevelConstraint, getNodeConstraint, setNodeConstraint

Methods inherited from class org.apache.lucene.search.Query

clone, getBoost, setBoost, toString

Methods inherited from class java.lang.Object

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

Field Detail

filter

protected final org.apache.lucene.search.Filter filter

query

protected final NodeQuery query

Constructor Detail

NodeConstantScoreQuery

public NodeConstantScoreQuery(NodeQuery query)

Strips off scores from the passed in Query. The hits will get a constant score dependent on the boost factor of this query.

Method Detail

getQuery

public NodeQuery getQuery()

Returns the encapsulated query, returns null if a filter is wrapped.

setAncestorPointer

protected void setAncestorPointer(NodeQuery ancestor)

Description copied from class: NodeQuery

Expert: Add a pointer to the node query ancestor

The pointer to node query ancestor is used to retrieve node constraints from ancestors.

Overrides:

setAncestorPointer in class NodeQuery

setNodeConstraint

public void setNodeConstraint(int lowerBound,
                     int upperBound)

Description copied from class: NodeQuery

Set an index interval constraint for a node. These constraints are inclusives.

Overrides:

setNodeConstraint in class NodeQuery

setLevelConstraint

public void setLevelConstraint(int levelConstraint)

Description copied from class: NodeQuery

Set a constraint on the node's level

Given that the root of the tree (level 0) is the document id, the node level constraint ranges from 1 to Integer.MAX_VALUE. A node level constraint of 0 will always return false.

Overrides:

setLevelConstraint in class NodeQuery

rewrite

public NodeQuery rewrite(org.apache.lucene.index.IndexReader reader)
                  throws IOException

Overrides:

rewrite in class org.apache.lucene.search.Query

Throws:

IOException

extractTerms

public void extractTerms(Set<org.apache.lucene.index.Term> terms)

Overrides:

extractTerms in class org.apache.lucene.search.Query

createWeight

public org.apache.lucene.search.Weight createWeight(org.apache.lucene.search.IndexSearcher searcher)
                                             throws IOException

Overrides:

createWeight in class org.apache.lucene.search.Query

Throws:

IOException

toString

public String toString(String field)

Specified by:

toString in class org.apache.lucene.search.Query

equals

public boolean equals(Object o)

Overrides:

equals in class org.apache.lucene.search.Query

hashCode

public int hashCode()

Overrides:

hashCode in class org.apache.lucene.search.Query