org.apache.solr.schema

Class TrieField

java.lang.Object

org.apache.solr.schema.FieldProperties

org.apache.solr.schema.FieldType

org.apache.solr.schema.PrimitiveFieldType

org.apache.solr.schema.TrieField

Direct Known Subclasses:

TrieDoubleField, TrieFloatField, TrieIntField, TrieLongField

public class TrieField
extends PrimitiveFieldType

Provides field types to support for Lucene's NumericField. See NumericRangeQuery for more details. It supports integer, float, long, double and date types.

For each number being added to this field, multiple terms are generated as per the algorithm described in the above link. The possible number of terms increases dramatically with lower precision steps. For the fast range search to work, trie fields must be indexed.

Trie fields are sortable in numerical order and can be used in function queries.

Note that if you use a precisionStep of 32 for int/float and 64 for long/double/date, then multiple terms will not be generated, range search will be no faster than any other number field, but sorting will still be possible.

Since:

solr 1.4

Version:

$Id: TrieField.java 1298427 2012-03-08 15:22:27Z janhoy $

See Also:

NumericRangeQuery

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	TrieField.TrieTypes

Nested classes/interfaces inherited from class org.apache.solr.schema.FieldType

FieldType.DefaultAnalyzer

Field Summary

Fields

Modifier and Type	Field and Description
static int	DEFAULT_PRECISION_STEP
protected Object	missingValue
protected int	precisionStep
protected int	precisionStepArg
protected TrieField.TrieTypes	type

Fields inherited from class org.apache.solr.schema.FieldType

analyzer, args, falseProperties, log, POLY_FIELD_SEPARATOR, queryAnalyzer, trueProperties, typeName

Fields inherited from class org.apache.solr.schema.FieldProperties

BINARY, INDEXED, MULTIVALUED, OMIT_NORMS, OMIT_POSITIONS, OMIT_TF_POSITIONS, REQUIRED, SORT_MISSING_FIRST, SORT_MISSING_LAST, STORE_TERMOFFSETS, STORE_TERMPOSITIONS, STORE_TERMVECTORS, STORED, TOKENIZED

Constructor Summary

Constructors

Constructor and Description
TrieField()

Method Summary

Methods

Modifier and Type	Method and Description
Fieldable	createField(SchemaField field, String externalVal, float boost) Used for adding a document when a field needs to be created from a type and a string.
static String	getMainValuePrefix(FieldType ft) expert internal use, subject to change.
int	getPrecisionStep()
Query	getRangeQuery(QParser parser, SchemaField field, String min, String max, boolean minInclusive, boolean maxInclusive) Returns a Query instance for doing range searches on this field type.
SortField	getSortField(SchemaField field, boolean top) Returns the SortField instance that should be used to sort fields of this type.
TrieField.TrieTypes	getType()
ValueSource	getValueSource(SchemaField field, QParser qparser) called to get the default value source (normally, from the Lucene FieldCache.)
String	indexedToReadable(String indexedForm) Given an indexed term, return the human readable representation
protected void	init(IndexSchema schema, Map<String,String> args) subclasses should initialize themselves with the args provided and remove valid arguments.
boolean	isTokenized() Returns true if fields of this type should be tokenized
boolean	multiValuedFieldCache() Returns true if a single field value of this type has multiple logical values for the purposes of faceting, sorting, etc.
String	readableToIndexed(String val) Given the readable value, return the term value that will match it.
String	storedToIndexed(Fieldable f) Given the stored field, return the indexed form
String	storedToReadable(Fieldable f) Given the stored field, return the human readable representation
String	toExternal(Fieldable f) Convert the stored-field format to an external (string, human readable) value
String	toInternal(String val) Convert an external value (from XML update command or from query string) into the internal format for both storing and indexing (which can be modified by any analyzers).
Object	toObject(Fieldable f) Convert the stored-field format to an external object.
void	write(TextResponseWriter writer, String name, Fieldable f) calls back to TextResponseWriter to write the field value
void	write(XMLWriter xmlWriter, String name, Fieldable f) Renders the specified field as XML

Methods inherited from class org.apache.solr.schema.FieldType

createField, createFields, getAnalyzer, getArg, getFieldIndex, getFieldQuery, getFieldStore, getFieldTermVec, getIndexOptions, getQueryAnalyzer, getStringSort, getTypeName, getValueSource, hasProperty, isMultiValued, isPolyField, restrictProps, setAnalyzer, setQueryAnalyzer, toString

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_PRECISION_STEP

public static final int DEFAULT_PRECISION_STEP

See Also:

Constant Field Values

precisionStepArg

protected int precisionStepArg

precisionStep

protected int precisionStep

type

protected TrieField.TrieTypes type

missingValue

protected Object missingValue

Constructor Detail

TrieField

public TrieField()

Method Detail

init

protected void init(IndexSchema schema,
        Map<String,String> args)

Description copied from class: FieldType

subclasses should initialize themselves with the args provided and remove valid arguments. leftover arguments will cause an exception. Common boolean properties have already been handled.

Overrides:

init in class PrimitiveFieldType

toObject

public Object toObject(Fieldable f)

Description copied from class: FieldType

Convert the stored-field format to an external object.

Overrides:

toObject in class FieldType

See Also:

FieldType.toInternal(java.lang.String)

getSortField

public SortField getSortField(SchemaField field,
                     boolean top)

Description copied from class: FieldType

Returns the SortField instance that should be used to sort fields of this type.

Specified by:

getSortField in class FieldType

See Also:

SchemaField.checkSortability()

getValueSource

public ValueSource getValueSource(SchemaField field,
                         QParser qparser)

Description copied from class: FieldType

called to get the default value source (normally, from the Lucene FieldCache.)

Overrides:

getValueSource in class FieldType

write

public void write(XMLWriter xmlWriter,
         String name,
         Fieldable f)
           throws IOException

Description copied from class: FieldType

Renders the specified field as XML

Specified by:

write in class FieldType

Throws:

IOException

write

public void write(TextResponseWriter writer,
         String name,
         Fieldable f)
           throws IOException

Description copied from class: FieldType

calls back to TextResponseWriter to write the field value

Specified by:

write in class FieldType

Throws:

IOException

isTokenized

public boolean isTokenized()

Description copied from class: FieldType

Returns true if fields of this type should be tokenized

Overrides:

isTokenized in class FieldType

multiValuedFieldCache

public boolean multiValuedFieldCache()

Description copied from class: FieldType

Returns true if a single field value of this type has multiple logical values for the purposes of faceting, sorting, etc. Text fields normally return true since each token/word is a logical value.

Overrides:

multiValuedFieldCache in class FieldType

getPrecisionStep

public int getPrecisionStep()

Returns:

the precisionStep used to index values into the field

getType

public TrieField.TrieTypes getType()

Returns:

the type of this field

getRangeQuery

public Query getRangeQuery(QParser parser,
                  SchemaField field,
                  String min,
                  String max,
                  boolean minInclusive,
                  boolean maxInclusive)

Description copied from class: FieldType

Returns a Query instance for doing range searches on this field type. SolrQueryParser currently passes part1 and part2 as null if they are '*' respectively. minInclusive and maxInclusive are both true currently by SolrQueryParser but that may change in the future. Also, other QueryParser implementations may have different semantics.

Sub-classes should override this method to provide their own range query implementation. They should strive to handle nulls in part1 and/or part2 as well as unequal minInclusive and maxInclusive parameters gracefully.

Overrides:

getRangeQuery in class FieldType

field - the schema field

min - the lower boundary of the range, nulls are allowed.

max - the upper boundary of the range, nulls are allowed

minInclusive - whether the minimum of the range is inclusive or not

maxInclusive - whether the maximum of the range is inclusive or not

Returns:

a Query instance to perform range search according to given parameters

See Also:

SolrQueryParser.getRangeQuery(String, String, String, boolean)

storedToReadable

public String storedToReadable(Fieldable f)

Description copied from class: FieldType

Given the stored field, return the human readable representation

Overrides:

storedToReadable in class FieldType

readableToIndexed

public String readableToIndexed(String val)

Description copied from class: FieldType

Given the readable value, return the term value that will match it.

Overrides:

readableToIndexed in class FieldType

toInternal

public String toInternal(String val)

Description copied from class: FieldType

Convert an external value (from XML update command or from query string) into the internal format for both storing and indexing (which can be modified by any analyzers).

Overrides:

toInternal in class FieldType

See Also:

FieldType.toExternal(org.apache.lucene.document.Fieldable)

toExternal

public String toExternal(Fieldable f)

Description copied from class: FieldType

Convert the stored-field format to an external (string, human readable) value

Overrides:

toExternal in class FieldType

See Also:

FieldType.toInternal(java.lang.String)

indexedToReadable

public String indexedToReadable(String indexedForm)

Description copied from class: FieldType

Given an indexed term, return the human readable representation

Overrides:

indexedToReadable in class FieldType

storedToIndexed

public String storedToIndexed(Fieldable f)

Description copied from class: FieldType

Given the stored field, return the indexed form

Overrides:

storedToIndexed in class FieldType

createField

public Fieldable createField(SchemaField field,
                    String externalVal,
                    float boost)

Description copied from class: FieldType

Used for adding a document when a field needs to be created from a type and a string.

By default, the indexed value is the same as the stored value (taken from toInternal()). Having a different representation for external, internal, and indexed would present quite a few problems given the current Lucene architecture. An analyzer for adding docs would need to translate internal->indexed while an analyzer for querying would need to translate external->indexed.

The only other alternative to having internal==indexed would be to have internal==external. In this case, toInternal should convert to the indexed representation, toExternal() should do nothing, and createField() should *not* call toInternal, but use the external value and set tokenized=true to get Lucene to convert to the internal(indexed) form.

:TODO: clean up and clarify this explanation.

Overrides:

createField in class FieldType

See Also:

FieldType.toInternal(java.lang.String)

getMainValuePrefix

public static String getMainValuePrefix(FieldType ft)

expert internal use, subject to change. Returns null if no prefix or prefix not needed, or the prefix of the main value of a trie field that indexes multiple precisions per value.