org.springframework.data.mongodb.core.aggregation

Class AccumulatorOperators.ExpMovingAvg

java.lang.Object

org.springframework.data.mongodb.core.aggregation.AccumulatorOperators.ExpMovingAvg

All Implemented Interfaces:

AggregationExpression, MongoExpression

Enclosing class:

AccumulatorOperators

public static class AccumulatorOperators.ExpMovingAvg
extends Object

AccumulatorOperators.ExpMovingAvg calculates the exponential moving average of numeric values.

Since:

3.3

Author:

Christoph Strobl

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected static class	AbstractAggregationExpression.Expand Expand a nested list of values to single entries or keep the list.

Method Summary

Modifier and Type	Method and Description
AccumulatorOperators.ExpMovingAvg	alpha(double exponentialDecayValue) Define the exponential decay value.
protected List<Object>	append(Object value)
protected List<Object>	append(Object value, AbstractAggregationExpression.Expand expandList)
protected Map<String,Object>	append(String key, Object value)
protected Map<String,Object>	appendAt(int index, String key, Object value) Append the given key at the position in the underlying LinkedHashMap.
protected Map<String,Object>	argumentMap() Get the argument map.
protected static List<Field>	asFields(String... fieldRefs)
protected boolean	contains(Object key) Check if the given key is available.
static AccumulatorOperators.ExpMovingAvg	expMovingAvgOf(AggregationExpression expression) Create a new AccumulatorOperators.ExpMovingAvg by defining the expression to compute the value to be used as input.
static AccumulatorOperators.ExpMovingAvg	expMovingAvgOf(String fieldReference) Create a new AccumulatorOperators.ExpMovingAvg by defining the field holding the value to be used as input.
protected <T> T	get(int index) Get the value at a given index.
protected <T> T	get(Object key) Get the value for a given key.
protected String	getMongoMethod()
AccumulatorOperators.ExpMovingAvg	n(int numberOfHistoricalDocuments) Define the number of historical documents with significant mathematical weight.
protected Map<String,Object>	remove(String key)
org.bson.Document	toDocument(AggregationOperationContext context) Turns the AggregationExpression into a Document within the given AggregationOperationContext.
org.bson.Document	toDocument(Object value, AggregationOperationContext context)
protected List<Object>	values()

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.springframework.data.mongodb.core.aggregation.AggregationExpression

from, toDocument

Methods inherited from interface org.springframework.data.mongodb.MongoExpression

create, create

Method Detail

expMovingAvgOf

public static AccumulatorOperators.ExpMovingAvg expMovingAvgOf(String fieldReference)

Create a new AccumulatorOperators.ExpMovingAvg by defining the field holding the value to be used as input.

Parameters:

fieldReference - must not be null.

Returns:

new instance of AccumulatorOperators.ExpMovingAvg.

expMovingAvgOf

public static AccumulatorOperators.ExpMovingAvg expMovingAvgOf(AggregationExpression expression)

Create a new AccumulatorOperators.ExpMovingAvg by defining the expression to compute the value to be used as input.

Parameters:

expression - must not be null.

Returns:

new instance of AccumulatorOperators.ExpMovingAvg.

n

public AccumulatorOperators.ExpMovingAvg n(int numberOfHistoricalDocuments)

Define the number of historical documents with significant mathematical weight.
Specify either N or aplha. Not both!

Parameters:

numberOfHistoricalDocuments -

Returns:

new instance of AccumulatorOperators.ExpMovingAvg.

alpha

public AccumulatorOperators.ExpMovingAvg alpha(double exponentialDecayValue)

Define the exponential decay value.
Specify either aplha or N. Not both!

Parameters:

exponentialDecayValue -

Returns:

new instance of AccumulatorOperators.ExpMovingAvg.

getMongoMethod

protected String getMongoMethod()

toDocument

public org.bson.Document toDocument(AggregationOperationContext context)

Description copied from interface: AggregationExpression

Turns the AggregationExpression into a Document within the given AggregationOperationContext.

Specified by:

toDocument in interface AggregationExpression

Parameters:

context - must not be null.

Returns:

the MongoDB native (Document) form of the expression.

toDocument

public org.bson.Document toDocument(Object value,
                                    AggregationOperationContext context)

asFields

protected static List<Field> asFields(String... fieldRefs)

append

protected List<Object> append(Object value,
                              AbstractAggregationExpression.Expand expandList)

append

protected List<Object> append(Object value)

append

protected Map<String,Object> append(String key,
                                    Object value)

remove

protected Map<String,Object> remove(String key)

appendAt

protected Map<String,Object> appendAt(int index,
                                      String key,
                                      Object value)

Append the given key at the position in the underlying LinkedHashMap.

Parameters:

index -

key -

value -

Returns:

Since:

3.1

values

protected List<Object> values()

get

protected <T> T get(int index)

Get the value at a given index.

Type Parameters:

T -

Parameters:

index -

Returns:

Since:

2.1

get

protected <T> T get(Object key)

Get the value for a given key.

Type Parameters:

T -

Parameters:

key -

Returns:

Since:

2.1

argumentMap

protected Map<String,Object> argumentMap()

Get the argument map.

Returns:

Since:

2.1

contains

protected boolean contains(Object key)

Check if the given key is available.

Parameters:

key -

Returns:

Since:

2.1