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>
- See Also:
LastFieldValueUpdateProcessorFactory
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
FirstFieldValueUpdateProcessorFactory
public FirstFieldValueUpdateProcessorFactory()
pickSubset
public Collection<Object> pickSubset(Collection<Object> 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
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