org.apache.lucene.search

Class DocTermOrdsRangeFilter

java.lang.Object

org.apache.lucene.search.Filter

org.apache.lucene.search.DocTermOrdsRangeFilter

public abstract class DocTermOrdsRangeFilter
extends Filter

A range filter built on top of a cached multi-valued term field (in FieldCache).

Like FieldCacheRangeFilter, this is just a specialized range query versus using a TermRangeQuery with DocTermOrdsRewriteMethod: it will only do two ordinal to term lookups.

Method Summary

Methods

Modifier and Type	Method and Description
boolean	equals(Object o)
abstract DocIdSet	getDocIdSet(AtomicReaderContext context, Bits acceptDocs) This method is implemented for each data type
String	getField() Returns the field name for this filter
BytesRef	getLowerVal() Returns the lower value of this range filter
BytesRef	getUpperVal() Returns the upper value of this range filter
int	hashCode()
boolean	includesLower() Returns true if the lower endpoint is inclusive
boolean	includesUpper() Returns true if the upper endpoint is inclusive
static DocTermOrdsRangeFilter	newBytesRefRange(String field, BytesRef lowerVal, BytesRef upperVal, boolean includeLower, boolean includeUpper) Creates a BytesRef range filter using FieldCache.getTermsIndex(org.apache.lucene.index.AtomicReader, java.lang.String).
String	toString()

Methods inherited from class java.lang.Object

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

Method Detail

getDocIdSet

public abstract DocIdSet getDocIdSet(AtomicReaderContext context,
                   Bits acceptDocs)
                              throws IOException

This method is implemented for each data type

Specified by:

getDocIdSet in class Filter

Parameters:

context - a AtomicReaderContext instance opened on the index currently searched on. Note, it is likely that the provided reader info does not represent the whole underlying index i.e. if the index has more than one segment the given reader only represents a single segment. The provided context is always an atomic context, so you can call AtomicReader.fields() on the context's reader, for example.

acceptDocs - Bits that represent the allowable docs to match (typically deleted docs but possibly filtering other documents)

Returns:

a DocIdSet that provides the documents which should be permitted or prohibited in search results. NOTE: null should be returned if the filter doesn't accept any documents otherwise internal optimization might not apply in the case an empty DocIdSet is returned.

Throws:

IOException

newBytesRefRange

public static DocTermOrdsRangeFilter newBytesRefRange(String field,
                                      BytesRef lowerVal,
                                      BytesRef upperVal,
                                      boolean includeLower,
                                      boolean includeUpper)

Creates a BytesRef range filter using FieldCache.getTermsIndex(org.apache.lucene.index.AtomicReader, java.lang.String). This works with all fields containing zero or one term in the field. The range can be half-open by setting one of the values to null.

toString

public final String toString()

Overrides:

toString in class Object

equals

public final boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public final int hashCode()

Overrides:

hashCode in class Object

getField

public String getField()

Returns the field name for this filter

includesLower

public boolean includesLower()

Returns true if the lower endpoint is inclusive

includesUpper

public boolean includesUpper()

Returns true if the upper endpoint is inclusive

getLowerVal

public BytesRef getLowerVal()

Returns the lower value of this range filter

getUpperVal

public BytesRef getUpperVal()

Returns the upper value of this range filter