Package org.apache.solr.update.processor

Class FirstFieldValueUpdateProcessorFactory

java.lang.Object

org.apache.solr.update.processor.UpdateRequestProcessorFactory

org.apache.solr.update.processor.FieldMutatingUpdateProcessorFactory

org.apache.solr.update.processor.FieldValueSubsetUpdateProcessorFactory

org.apache.solr.update.processor.FirstFieldValueUpdateProcessorFactory

All Implemented Interfaces:

NamedListInitializedPlugin, SolrCoreAware

public final class FirstFieldValueUpdateProcessorFactory
extends FieldValueSubsetUpdateProcessorFactory

Keeps only the first value of fields matching the specified conditions. Correct behavior assumes that the SolrInputFields being mutated are either single valued, or use an ordered Collection (ie: not a Set).

By default, this processor matches no fields.

For example, in the configuration below, if a field named primary_author contained multiple values (ie: "Adam Doe", "Bob Smith", "Carla Jones") then only the first value (ie: "Adam Doe") will be kept

 <processor class="solr.FirstFieldValueUpdateProcessorFactory">
   <str name="fieldName">primary_author</str>
 </processor>
 

Since:

4.0.0

See Also:

• LastFieldValueUpdateProcessorFactory

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.solr.update.processor.FieldMutatingUpdateProcessorFactory

FieldMutatingUpdateProcessorFactory.SelectorParams

Nested classes/interfaces inherited from class org.apache.solr.update.processor.UpdateRequestProcessorFactory

UpdateRequestProcessorFactory.RunAlways

Constructor Summary

Constructors

Constructor	Description
FirstFieldValueUpdateProcessorFactory()

Method Summary

Modifier and Type	Method	Description
FieldMutatingUpdateProcessor.FieldNameSelector	getDefaultSelector(SolrCore core)	Defines the default selection behavior when the user has not configured any specific criteria for selecting fields.
<T> Collection<T>	pickSubset(Collection<T> values)	Method subclasses must override to specify which values should be kept.

Methods inherited from class org.apache.solr.update.processor.FieldValueSubsetUpdateProcessorFactory

getInstance

Methods inherited from class org.apache.solr.update.processor.FieldMutatingUpdateProcessorFactory

getSelector, inform, init, parseSelectorExclusionParams, parseSelectorParams

Methods inherited from class java.lang.Object

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

Constructor Details

FirstFieldValueUpdateProcessorFactory

public FirstFieldValueUpdateProcessorFactory()

Method Details

pickSubset

public <T> Collection<T> pickSubset(Collection<T> values)

Description copied from class: FieldValueSubsetUpdateProcessorFactory

Method subclasses must override to specify which values should be kept. This method will not be called unless the collection contains more then one value.

Specified by:

pickSubset in class FieldValueSubsetUpdateProcessorFactory

getDefaultSelector

public FieldMutatingUpdateProcessor.FieldNameSelector getDefaultSelector(SolrCore core)

Description copied from class: FieldMutatingUpdateProcessorFactory

Defines the default selection behavior when the user has not configured any specific criteria for selecting fields. The Default implementation matches all fields, and should be overridden by subclasses as needed.

Overrides:

getDefaultSelector in class FieldMutatingUpdateProcessorFactory

See Also:

• FieldMutatingUpdateProcessor.SELECT_ALL_FIELDS