public class CountOperation extends Object implements FieldsExposingAggregationOperation
$count
-operation. Aggregation.count()
instead of creating instances of this class
directly.Modifier and Type | Class and Description |
---|---|
static class |
CountOperation.CountOperationBuilder
Builder for
CountOperation . |
FieldsExposingAggregationOperation.InheritsFieldsAggregationOperation
Constructor and Description |
---|
CountOperation(String fieldName)
Creates a new
CountOperation given the fieldName field name. |
Modifier and Type | Method and Description |
---|---|
ExposedFields |
getFields()
Returns the fields exposed by the
AggregationOperation . |
String |
getOperator()
Return the MongoDB operator that is used for this
AggregationOperation . |
org.bson.Document |
toDocument(AggregationOperationContext context)
|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
inheritsFields
toPipelineStages
public CountOperation(String fieldName)
CountOperation
given the fieldName field name.fieldName
- must not be null or empty.public org.bson.Document toDocument(AggregationOperationContext context)
AggregationOperation
toDocument
in interface AggregationOperation
context
- the AggregationOperationContext
to operate within. Must not be null.public String getOperator()
AggregationOperation
AggregationOperation
. Aggregation operations should
implement this method to avoid document rendering.getOperator
in interface AggregationOperation
AggregationOperation
.public ExposedFields getFields()
FieldsExposingAggregationOperation
AggregationOperation
.getFields
in interface FieldsExposingAggregationOperation
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