org.apache.lucene.search
Class FieldCacheRangeFilter<T>

java.lang.Object
  org.apache.lucene.search.Filter
      org.apache.lucene.search.FieldCacheRangeFilter<T>

All Implemented Interfaces:

Serializable

public abstract class FieldCacheRangeFilter<T>
extends Filter

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

FieldCacheRangeFilter builds a single cache for the field the first time it is used. Each subsequent FieldCacheRangeFilter on the same field then reuses this cache, even if the range itself changes.

This means that FieldCacheRangeFilter is much faster (sometimes more than 100x as fast) as building a TermRangeFilter, if using a newStringRange(java.lang.String, java.lang.String, java.lang.String, boolean, boolean). However, if the range never changes it is slower (around 2x as slow) than building a CachingWrapperFilter on top of a single TermRangeFilter. For numeric data types, this filter may be significantly faster than NumericRangeFilter. Furthermore, it does not need the numeric values encoded by NumericField. But it has the problem that it only works with exact one value/document (see below).

As with all FieldCache based functionality, FieldCacheRangeFilter is only valid for fields which exact one term for each document (except for newStringRange(java.lang.String, java.lang.String, java.lang.String, boolean, boolean) where 0 terms are also allowed). Due to a restriction of FieldCache, for numeric ranges all terms that do not have a numeric value, 0 is assumed.

Thus it works on dates, prices and other single value fields but will not work on regular text fields. It is preferable to use a NOT_ANALYZED field to ensure that there is only a single term.

This class does not have an constructor, use one of the static factory methods available, that create a correct instance for different data types supported by FieldCache.

See Also:

Serialized Form

Method Summary

boolean	equals(Object o)
abstract DocIdSet	getDocIdSet(IndexReader reader) This method is implemented for each data type
String	getField() Returns the field name for this filter
T	getLowerVal() Returns the lower value of this range filter
FieldCache.Parser	getParser() Returns the current numeric parser (null for T is String}
T	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 FieldCacheRangeFilter<Byte>	newByteRange(String field, Byte lowerVal, Byte upperVal, boolean includeLower, boolean includeUpper) Creates a numeric range filter using FieldCache.getBytes(IndexReader,String).
static FieldCacheRangeFilter<Byte>	newByteRange(String field, FieldCache.ByteParser parser, Byte lowerVal, Byte upperVal, boolean includeLower, boolean includeUpper) Creates a numeric range filter using FieldCache.getBytes(IndexReader,String,FieldCache.ByteParser).
static FieldCacheRangeFilter<Double>	newDoubleRange(String field, Double lowerVal, Double upperVal, boolean includeLower, boolean includeUpper) Creates a numeric range filter using FieldCache.getDoubles(IndexReader,String).
static FieldCacheRangeFilter<Double>	newDoubleRange(String field, FieldCache.DoubleParser parser, Double lowerVal, Double upperVal, boolean includeLower, boolean includeUpper) Creates a numeric range filter using FieldCache.getDoubles(IndexReader,String,FieldCache.DoubleParser).
static FieldCacheRangeFilter<Float>	newFloatRange(String field, FieldCache.FloatParser parser, Float lowerVal, Float upperVal, boolean includeLower, boolean includeUpper) Creates a numeric range filter using FieldCache.getFloats(IndexReader,String,FieldCache.FloatParser).
static FieldCacheRangeFilter<Float>	newFloatRange(String field, Float lowerVal, Float upperVal, boolean includeLower, boolean includeUpper) Creates a numeric range filter using FieldCache.getFloats(IndexReader,String).
static FieldCacheRangeFilter<Integer>	newIntRange(String field, FieldCache.IntParser parser, Integer lowerVal, Integer upperVal, boolean includeLower, boolean includeUpper) Creates a numeric range filter using FieldCache.getInts(IndexReader,String,FieldCache.IntParser).
static FieldCacheRangeFilter<Integer>	newIntRange(String field, Integer lowerVal, Integer upperVal, boolean includeLower, boolean includeUpper) Creates a numeric range filter using FieldCache.getInts(IndexReader,String).
static FieldCacheRangeFilter<Long>	newLongRange(String field, FieldCache.LongParser parser, Long lowerVal, Long upperVal, boolean includeLower, boolean includeUpper) Creates a numeric range filter using FieldCache.getLongs(IndexReader,String,FieldCache.LongParser).
static FieldCacheRangeFilter<Long>	newLongRange(String field, Long lowerVal, Long upperVal, boolean includeLower, boolean includeUpper) Creates a numeric range filter using FieldCache.getLongs(IndexReader,String).
static FieldCacheRangeFilter<Short>	newShortRange(String field, FieldCache.ShortParser parser, Short lowerVal, Short upperVal, boolean includeLower, boolean includeUpper) Creates a numeric range filter using FieldCache.getShorts(IndexReader,String,FieldCache.ShortParser).
static FieldCacheRangeFilter<Short>	newShortRange(String field, Short lowerVal, Short upperVal, boolean includeLower, boolean includeUpper) Creates a numeric range filter using FieldCache.getShorts(IndexReader,String).
static FieldCacheRangeFilter<String>	newStringRange(String field, String lowerVal, String upperVal, boolean includeLower, boolean includeUpper) Creates a string range filter using FieldCache.getStringIndex(org.apache.lucene.index.IndexReader, 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(IndexReader reader)
                              throws IOException

This method is implemented for each data type

Specified by:

getDocIdSet in class Filter

Parameters:

reader - a IndexReader instance opened on the index currently searched on. Note, it is likely that the provided reader 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.

Returns:

a DocIdSet that provides the documents which should be permitted or prohibited in search results. NOTE: null can be returned if no documents will be accepted by this Filter.

Throws:

IOException

See Also:

DocIdBitSet

newStringRange

public static FieldCacheRangeFilter<String> newStringRange(String field,
                                                           String lowerVal,
                                                           String upperVal,
                                                           boolean includeLower,
                                                           boolean includeUpper)

Creates a string range filter using FieldCache.getStringIndex(org.apache.lucene.index.IndexReader, 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.

newByteRange

public static FieldCacheRangeFilter<Byte> newByteRange(String field,
                                                       Byte lowerVal,
                                                       Byte upperVal,
                                                       boolean includeLower,
                                                       boolean includeUpper)

Creates a numeric range filter using FieldCache.getBytes(IndexReader,String). This works with all byte fields containing exactly one numeric term in the field. The range can be half-open by setting one of the values to null.

newByteRange

public static FieldCacheRangeFilter<Byte> newByteRange(String field,
                                                       FieldCache.ByteParser parser,
                                                       Byte lowerVal,
                                                       Byte upperVal,
                                                       boolean includeLower,
                                                       boolean includeUpper)

Creates a numeric range filter using FieldCache.getBytes(IndexReader,String,FieldCache.ByteParser). This works with all byte fields containing exactly one numeric term in the field. The range can be half-open by setting one of the values to null.

newShortRange

public static FieldCacheRangeFilter<Short> newShortRange(String field,
                                                         Short lowerVal,
                                                         Short upperVal,
                                                         boolean includeLower,
                                                         boolean includeUpper)

Creates a numeric range filter using FieldCache.getShorts(IndexReader,String). This works with all short fields containing exactly one numeric term in the field. The range can be half-open by setting one of the values to null.

newShortRange

public static FieldCacheRangeFilter<Short> newShortRange(String field,
                                                         FieldCache.ShortParser parser,
                                                         Short lowerVal,
                                                         Short upperVal,
                                                         boolean includeLower,
                                                         boolean includeUpper)

Creates a numeric range filter using FieldCache.getShorts(IndexReader,String,FieldCache.ShortParser). This works with all short fields containing exactly one numeric term in the field. The range can be half-open by setting one of the values to null.

newIntRange

public static FieldCacheRangeFilter<Integer> newIntRange(String field,
                                                         Integer lowerVal,
                                                         Integer upperVal,
                                                         boolean includeLower,
                                                         boolean includeUpper)

Creates a numeric range filter using FieldCache.getInts(IndexReader,String). This works with all int fields containing exactly one numeric term in the field. The range can be half-open by setting one of the values to null.

newIntRange

public static FieldCacheRangeFilter<Integer> newIntRange(String field,
                                                         FieldCache.IntParser parser,
                                                         Integer lowerVal,
                                                         Integer upperVal,
                                                         boolean includeLower,
                                                         boolean includeUpper)

Creates a numeric range filter using FieldCache.getInts(IndexReader,String,FieldCache.IntParser). This works with all int fields containing exactly one numeric term in the field. The range can be half-open by setting one of the values to null.

newLongRange

public static FieldCacheRangeFilter<Long> newLongRange(String field,
                                                       Long lowerVal,
                                                       Long upperVal,
                                                       boolean includeLower,
                                                       boolean includeUpper)

Creates a numeric range filter using FieldCache.getLongs(IndexReader,String). This works with all long fields containing exactly one numeric term in the field. The range can be half-open by setting one of the values to null.

newLongRange

public static FieldCacheRangeFilter<Long> newLongRange(String field,
                                                       FieldCache.LongParser parser,
                                                       Long lowerVal,
                                                       Long upperVal,
                                                       boolean includeLower,
                                                       boolean includeUpper)

Creates a numeric range filter using FieldCache.getLongs(IndexReader,String,FieldCache.LongParser). This works with all long fields containing exactly one numeric term in the field. The range can be half-open by setting one of the values to null.

newFloatRange

public static FieldCacheRangeFilter<Float> newFloatRange(String field,
                                                         Float lowerVal,
                                                         Float upperVal,
                                                         boolean includeLower,
                                                         boolean includeUpper)

Creates a numeric range filter using FieldCache.getFloats(IndexReader,String). This works with all float fields containing exactly one numeric term in the field. The range can be half-open by setting one of the values to null.

newFloatRange

public static FieldCacheRangeFilter<Float> newFloatRange(String field,
                                                         FieldCache.FloatParser parser,
                                                         Float lowerVal,
                                                         Float upperVal,
                                                         boolean includeLower,
                                                         boolean includeUpper)

Creates a numeric range filter using FieldCache.getFloats(IndexReader,String,FieldCache.FloatParser). This works with all float fields containing exactly one numeric term in the field. The range can be half-open by setting one of the values to null.

newDoubleRange

public static FieldCacheRangeFilter<Double> newDoubleRange(String field,
                                                           Double lowerVal,
                                                           Double upperVal,
                                                           boolean includeLower,
                                                           boolean includeUpper)

Creates a numeric range filter using FieldCache.getDoubles(IndexReader,String). This works with all double fields containing exactly one numeric term in the field. The range can be half-open by setting one of the values to null.

newDoubleRange

public static FieldCacheRangeFilter<Double> newDoubleRange(String field,
                                                           FieldCache.DoubleParser parser,
                                                           Double lowerVal,
                                                           Double upperVal,
                                                           boolean includeLower,
                                                           boolean includeUpper)

Creates a numeric range filter using FieldCache.getDoubles(IndexReader,String,FieldCache.DoubleParser). This works with all double fields containing exactly one numeric 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 T getLowerVal()

Returns the lower value of this range filter

getUpperVal

public T getUpperVal()

Returns the upper value of this range filter

getParser

public FieldCache.Parser getParser()

Returns the current numeric parser (null for T is String}