org.apache.solr.schema

Class ExternalFileField

java.lang.Object

org.apache.solr.schema.FieldProperties

org.apache.solr.schema.FieldType

org.apache.solr.schema.ExternalFileField

All Implemented Interfaces:

SchemaAware

public class ExternalFileField
extends FieldType
implements SchemaAware

Get values from an external file instead of the index.

keyField will normally be the unique key field, but it doesn't have to be.

• It's OK to have a keyField value that can't be found in the index
• It's OK to have some documents without a keyField in the file (defVal is used as the default)
• It's OK for a keyField value to point to multiple documents (no uniqueness requirement)

valType is a reference to another fieldType to define the value type of this field (must currently be TrieFloatField or LegacyFloatField (valType="pfloat|float|tfloat") if used). This parameter has never been implemented. As of Solr 3.6/4.0 it is optional and can be omitted. The format of the external file is simply newline separated keyFieldValue=floatValue.
Example:
doc33=1.414
doc34=3.14159
doc40=42

Solr looks for the external file in the index directory under the name of external_<fieldname> or external_<fieldname>.*

If any files of the latter pattern appear, the last (after being sorted by name) will be used and previous versions will be deleted. This is to help support systems where one may not be able to overwrite a file (like Windows, if the file is in use).

If the external file has already been loaded, and it is changed, those changes will not be visible until a commit has been done.

The external file may be sorted or unsorted by the key field, but it will be substantially slower (untested) if it isn't sorted.

Fields of this type may currently only be used as a ValueSource in a FunctionQuery.

See Also:

ExternalFileFieldReloader

Nested Class Summary

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

FieldType.DefaultAnalyzer, FieldType.MultiValueSelector

Field Summary

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

ANALYZER, args, CHAR_FILTER, CHAR_FILTERS, CLASS_NAME, docValuesFormat, falseProperties, FILTER, FILTERS, INDEX, INDEX_ANALYZER, MULTI_TERM, MULTI_TERM_ANALYZER, POLY_FIELD_SEPARATOR, postingsFormat, properties, QUERY, QUERY_ANALYZER, similarity, SIMILARITY, similarityFactory, TOKENIZER, trueProperties, TYPE, TYPE_NAME, typeName

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

BINARY, DOC_VALUES, INDEXED, MULTIVALUED, OMIT_NORMS, OMIT_POSITIONS, OMIT_TF_POSITIONS, REQUIRED, SORT_MISSING_FIRST, SORT_MISSING_LAST, STORE_OFFSETS, STORE_TERMOFFSETS, STORE_TERMPAYLOADS, STORE_TERMPOSITIONS, STORE_TERMVECTORS, STORED, TOKENIZED, USE_DOCVALUES_AS_STORED

Constructor Summary

Constructors

Constructor and Description
ExternalFileField()

Method Summary

Modifier and Type	Method and Description
FileFloatSource	getFileFloatSource(SchemaField field) Get a FileFloatSource for the given field, using the datadir from the IndexSchema
FileFloatSource	getFileFloatSource(SchemaField field, String datadir) Get a FileFloatSource for the given field.
SortField	getSortField(SchemaField field, boolean reverse) Returns the SortField instance that should be used to sort fields of this type.
UninvertingReader.Type	getUninversionType(SchemaField sf) DocValues is not enabled for a field, but it's indexed, docvalues can be constructed on the fly (uninverted, aka fieldcache) on the first request to sort, facet, etc.
ValueSource	getValueSource(SchemaField field, QParser parser) called to get the default value source (normally, from the Lucene FieldCache.)
void	inform(IndexSchema schema) Informs the IndexSchema provided by the schema parameter of an event (e.g., a new FieldType was added, etc.
protected void	init(IndexSchema schema, Map<String,String> args) subclasses should initialize themselves with the args provided and remove valid arguments.
void	write(TextResponseWriter writer, String name, IndexableField f) calls back to TextResponseWriter to write the field value

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

checkSchemaField, createField, createField, createFields, getAnalyzerProperties, getClassArg, getDocValuesFormat, getFieldQuery, getIndexAnalyzer, getIndexOptions, getNamedPropertyValues, getNonFieldPropertyArgs, getNumericType, getPostingsFormat, getPrefixQuery, getQueryAnalyzer, getRangeQuery, getRewriteMethod, getSimilarity, getSimilarityFactory, getSingleValueSource, getStringSort, getTypeName, hasProperty, indexedToReadable, indexedToReadable, isExplicitAnalyzer, isExplicitQueryAnalyzer, isMultiValued, isPolyField, isTokenized, marshalBase64SortValue, marshalSortValue, marshalStringSortValue, multiValuedFieldCache, readableToIndexed, readableToIndexed, restrictProps, setArgs, setIndexAnalyzer, setIsExplicitAnalyzer, setIsExplicitQueryAnalyzer, setQueryAnalyzer, setSimilarity, storedToIndexed, storedToReadable, supportsAnalyzers, toExternal, toInternal, toNativeType, toObject, toObject, toString, unmarshalBase64SortValue, unmarshalSortValue, unmarshalStringSortValue, useDocValuesAsStored

Methods inherited from class java.lang.Object

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

Constructor Detail

ExternalFileField

public ExternalFileField()

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 FieldType

write

public void write(TextResponseWriter writer,
                  String name,
                  IndexableField 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

getSortField

public SortField getSortField(SchemaField field,
                              boolean reverse)

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()

getUninversionType

public UninvertingReader.Type getUninversionType(SchemaField sf)

Description copied from class: FieldType

DocValues is not enabled for a field, but it's indexed, docvalues can be constructed on the fly (uninverted, aka fieldcache) on the first request to sort, facet, etc. This specifies the structure to use.

Specified by:

getUninversionType in class FieldType

Parameters:

sf - field instance

Returns:

type to uninvert, or null (to disallow uninversion for the field)

getValueSource

public ValueSource getValueSource(SchemaField field,
                                  QParser parser)

Description copied from class: FieldType

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

Overrides:

getValueSource in class FieldType

getFileFloatSource

public FileFloatSource getFileFloatSource(SchemaField field)

Get a FileFloatSource for the given field, using the datadir from the IndexSchema

Parameters:

field - the field to get a source for

Returns:

a FileFloatSource

getFileFloatSource

public FileFloatSource getFileFloatSource(SchemaField field,
                                          String datadir)

Get a FileFloatSource for the given field. Call this in preference to getFileFloatSource(SchemaField) if this may be called before the Core is fully initialised (eg in SolrEventListener calls).

Parameters:

field - the field to get a source for

datadir - the data directory in which to look for the external file

Returns:

a FileFloatSource

inform

public void inform(IndexSchema schema)

Description copied from interface: SchemaAware

Informs the IndexSchema provided by the schema parameter of an event (e.g., a new FieldType was added, etc.

Specified by:

inform in interface SchemaAware

Parameters:

schema - The IndexSchema instance that inform of the update to.