org.apache.lucene.document

Class FloatRange

java.lang.Object

org.apache.lucene.document.Field

org.apache.lucene.document.FloatRange

All Implemented Interfaces:

IndexableField

public class FloatRange
extends Field

An indexed Float Range field.

This field indexes dimensional ranges defined as min/max pairs. It supports up to a maximum of 4 dimensions (indexed as 8 numeric values). With 1 dimension representing a single float range, 2 dimensions representing a bounding box, 3 dimensions a bounding cube, and 4 dimensions a tesseract.

Multiple values for the same field in one document is supported, and open ended ranges can be defined using Float.NEGATIVE_INFINITY and Float.POSITIVE_INFINITY.

This field defines the following static factory methods for common search operations over float ranges:

• newIntersectsQuery() matches ranges that intersect the defined search range.
• newWithinQuery() matches ranges that are within the defined search range.
• newContainsQuery() matches ranges that contain the defined search range.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.lucene.document.Field

Field.Store

Field Summary

Fields

Modifier and Type	Field and Description
static int	BYTES stores float values so number of bytes is 4

Fields inherited from class org.apache.lucene.document.Field

fieldsData, name, tokenStream, type

Constructor Summary

Constructors

Constructor and Description
FloatRange(String name, float[] min, float[] max) Create a new FloatRange type, from min/max parallel arrays

Method Summary

Modifier and Type	Method and Description
float	getMax(int dimension) Get the max value for the given dimension
float	getMin(int dimension) Get the min value for the given dimension
static Query	newContainsQuery(String field, float[] min, float[] max) Create a query for matching indexed float ranges that contain the defined range.
static Query	newCrossesQuery(String field, float[] min, float[] max) Create a query for matching indexed ranges that cross the defined range.
static Query	newIntersectsQuery(String field, float[] min, float[] max) Create a query for matching indexed ranges that intersect the defined range.
static Query	newWithinQuery(String field, float[] min, float[] max) Create a query for matching indexed ranges that are within the defined range.
void	setRangeValues(float[] min, float[] max) Changes the values of the field.
String	toString() Prints a Field for human consumption.

Methods inherited from class org.apache.lucene.document.Field

binaryValue, fieldType, getCharSequenceValue, name, numericValue, readerValue, setBytesValue, setBytesValue, setByteValue, setDoubleValue, setFloatValue, setIntValue, setLongValue, setReaderValue, setShortValue, setStringValue, setTokenStream, stringValue, tokenStream, tokenStreamValue

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

BYTES

public static final int BYTES

stores float values so number of bytes is 4

See Also:

Constant Field Values

Constructor Detail

FloatRange

public FloatRange(String name,
                  float[] min,
                  float[] max)

Create a new FloatRange type, from min/max parallel arrays

Parameters:

name - field name. must not be null.

min - range min values; each entry is the min value for the dimension

max - range max values; each entry is the max value for the dimension

Method Detail

setRangeValues

public void setRangeValues(float[] min,
                           float[] max)

Changes the values of the field.

Parameters:

min - array of min values. (accepts Float.NEGATIVE_INFINITY)

max - array of max values. (accepts Float.POSITIVE_INFINITY)

Throws:

IllegalArgumentException - if min or max is invalid

getMin

public float getMin(int dimension)

Get the min value for the given dimension

Parameters:

dimension - the dimension, always positive

Returns:

the decoded min value

getMax

public float getMax(int dimension)

Get the max value for the given dimension

Parameters:

dimension - the dimension, always positive

Returns:

the decoded max value

newIntersectsQuery

public static Query newIntersectsQuery(String field,
                                       float[] min,
                                       float[] max)

Create a query for matching indexed ranges that intersect the defined range.

Parameters:

field - field name. must not be null.

min - array of min values. (accepts Float.NEGATIVE_INFINITY)

max - array of max values. (accepts Float.MAX_VALUE)

Returns:

query for matching intersecting ranges (overlap, within, or contains)

Throws:

IllegalArgumentException - if field is null, min or max is invalid

newContainsQuery

public static Query newContainsQuery(String field,
                                     float[] min,
                                     float[] max)

Create a query for matching indexed float ranges that contain the defined range.

Parameters:

field - field name. must not be null.

min - array of min values. (accepts Float.NEGATIVE_INFINITY)

max - array of max values. (accepts Float.POSITIVE_INFINITY)

Returns:

query for matching ranges that contain the defined range

Throws:

IllegalArgumentException - if field is null, min or max is invalid

newWithinQuery

public static Query newWithinQuery(String field,
                                   float[] min,
                                   float[] max)

Create a query for matching indexed ranges that are within the defined range.

Parameters:

field - field name. must not be null.

min - array of min values. (accepts Float.NEGATIVE_INFINITY)

max - array of max values. (accepts Float.POSITIVE_INFINITY)

Returns:

query for matching ranges within the defined range

Throws:

IllegalArgumentException - if field is null, min or max is invalid

newCrossesQuery

public static Query newCrossesQuery(String field,
                                    float[] min,
                                    float[] max)

Create a query for matching indexed ranges that cross the defined range. A CROSSES is defined as any set of ranges that are not disjoint and not wholly contained by the query. Effectively, its the complement of union(WITHIN, DISJOINT).

Parameters:

field - field name. must not be null.

min - array of min values. (accepts Float.NEGATIVE_INFINITY)

max - array of max values. (accepts Float.POSITIVE_INFINITY)

Returns:

query for matching ranges within the defined range

Throws:

IllegalArgumentException - if field is null, min or max is invalid

toString

public String toString()

Description copied from class: Field

Prints a Field for human consumption.

Overrides:

toString in class Field