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java.lang.Object org.apache.solr.schema.FieldProperties org.apache.solr.schema.FieldType org.apache.solr.schema.ExternalFileField
public class ExternalFileField
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.
valType
is a reference to another fieldType to define the value type of this field
(must currently be TrieFloatField or FloatField (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.
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.
ExternalFileFieldReloader
Nested Class Summary |
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Nested classes/interfaces inherited from class org.apache.solr.schema.FieldType |
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FieldType.DefaultAnalyzer |
Field Summary |
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Fields inherited from class org.apache.solr.schema.FieldType |
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analyzer, args, docValuesFormat, falseProperties, log, POLY_FIELD_SEPARATOR, postingsFormat, properties, queryAnalyzer, similarity, similarityFactory, trueProperties, typeName |
Fields inherited from class org.apache.solr.schema.FieldProperties |
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BINARY, DOC_VALUES, INDEXED, MULTIVALUED, OMIT_NORMS, OMIT_POSITIONS, OMIT_TF_POSITIONS, REQUIRED, SORT_MISSING_FIRST, SORT_MISSING_LAST, STORE_OFFSETS, STORE_TERMOFFSETS, STORE_TERMPOSITIONS, STORE_TERMVECTORS, STORED, TOKENIZED |
Constructor Summary | |
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ExternalFileField()
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Method Summary | |
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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. |
ValueSource |
getValueSource(SchemaField field,
QParser parser)
called to get the default value source (normally, from the Lucene FieldCache.) |
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 java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public ExternalFileField()
Method Detail |
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protected void init(IndexSchema schema, Map<String,String> args)
FieldType
init
in class FieldType
public void write(TextResponseWriter writer, String name, IndexableField f) throws IOException
FieldType
write
in class FieldType
IOException
public SortField getSortField(SchemaField field, boolean reverse)
FieldType
getSortField
in class FieldType
SchemaField.checkSortability()
public ValueSource getValueSource(SchemaField field, QParser parser)
FieldType
getValueSource
in class FieldType
public FileFloatSource getFileFloatSource(SchemaField field)
field
- the field to get a source for
public FileFloatSource getFileFloatSource(SchemaField field, String datadir)
field
- the field to get a source fordatadir
- the data directory in which to look for the external file
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