org.apache.lucene.search

Class PointRangeQuery

java.lang.Object

org.apache.lucene.search.Query

org.apache.lucene.search.PointRangeQuery

public abstract class PointRangeQuery
extends Query

Abstract class for range queries against single or multidimensional points such as IntPoint.

This is for subclasses and works on the underlying binary encoding: to create range queries for lucene's standard Point types, refer to factory methods on those classes, e.g. IntPoint.newRangeQuery() for fields indexed with IntPoint.

For a single-dimensional field this query is a simple range query; in a multi-dimensional field it's a box shape.

See Also:

PointValues

WARNING: This API is experimental and might change in incompatible ways in the next release.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	PointRangeQuery(String field, byte[] lowerPoint, byte[] upperPoint, int numDims) Expert: create a multidimensional range query for point values.

Method Summary

Modifier and Type	Method and Description
static void	checkArgs(String field, Object lowerPoint, Object upperPoint) Check preconditions for all factory methods
Weight	createWeight(IndexSearcher searcher, boolean needsScores) Expert: Constructs an appropriate Weight implementation for this query.
boolean	equals(Object o) Override and implement query instance equivalence properly in a subclass.
int	getBytesPerDim()
String	getField()
byte[]	getLowerPoint()
int	getNumDims()
byte[]	getUpperPoint()
int	hashCode() Override and implement query hash code properly in a subclass.
protected abstract String	toString(int dimension, byte[] value) Returns a string of a single value in a human-readable format for debugging.
String	toString(String field) Prints a query to a string, with field assumed to be the default field and omitted.

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

classHash, rewrite, sameClassAs, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

PointRangeQuery

protected PointRangeQuery(String field,
                          byte[] lowerPoint,
                          byte[] upperPoint,
                          int numDims)

Expert: create a multidimensional range query for point values.

Parameters:

field - field name. must not be null.

lowerPoint - lower portion of the range (inclusive).

upperPoint - upper portion of the range (inclusive).

numDims - number of dimensions.

Throws:

IllegalArgumentException - if field is null, or if lowerValue.length != upperValue.length

Method Detail

checkArgs

public static void checkArgs(String field,
                             Object lowerPoint,
                             Object upperPoint)

Check preconditions for all factory methods

Throws:

IllegalArgumentException - if field, lowerPoint or upperPoint are null.

createWeight

public final Weight createWeight(IndexSearcher searcher,
                                 boolean needsScores)
                          throws IOException

Description copied from class: Query

Expert: Constructs an appropriate Weight implementation for this query.

Only implemented by primitive queries, which re-write to themselves.

Overrides:

createWeight in class Query

needsScores - True if document scores (Scorer.score()) or match frequencies (Scorer.freq()) are needed.

Throws:

IOException

getField

public String getField()

getNumDims

public int getNumDims()

getBytesPerDim

public int getBytesPerDim()

getLowerPoint

public byte[] getLowerPoint()

getUpperPoint

public byte[] getUpperPoint()

hashCode

public final int hashCode()

Description copied from class: Query

Override and implement query hash code properly in a subclass. This is required so that QueryCache works properly.

Specified by:

hashCode in class Query

See Also:

Query.equals(Object)

equals

public final boolean equals(Object o)

Description copied from class: Query

Override and implement query instance equivalence properly in a subclass. This is required so that QueryCache works properly. Typically a query will be equal to another only if it's an instance of the same class and its document-filtering properties are identical that other instance. Utility methods are provided for certain repetitive code.

Specified by:

equals in class Query

See Also:

Query.sameClassAs(Object), Query.classHash()

toString

public final String toString(String field)

Description copied from class: Query

Prints a query to a string, with field assumed to be the default field and omitted.

Specified by:

toString in class Query

toString

protected abstract String toString(int dimension,
                                   byte[] value)

Returns a string of a single value in a human-readable format for debugging. This is used by Query.toString().

Parameters:

dimension - dimension of the particular value

value - single value, never null

Returns:

human readable value for debugging