Package dev.morphia.aggregation.expressions.impls

Class Expression

java.lang.Object

dev.morphia.aggregation.expressions.impls.Expression

Direct Known Subclasses:

Accumulator, AccumulatorExpression, ArrayExpression, ArrayFilterExpression, ArrayIndexExpression, BooleanExpressions.LogicalExpression, CalculusExpression, ConvertExpression, DateDeltaExpression, DateDiffExpression, DateExpressions.DateExpression, DateFromParts, DateFromString, DateToParts, DateToString, DateTruncExpression, DocumentExpression, EndResultsExpression, ExpMovingAvg, ExpressionList, FunctionExpression, IfNull, IndexExpression, IsoDates, LetExpression, LiteralExpression, MapExpression, MathExpression, MetaExpression, NRankedResultsExpression, ObjectExpressions.MergeObjects, Push, RangeExpression, RankedResultsExpression, ReduceExpression, RegexExpression, ReplaceExpression, SetFieldExpression, ShiftExpression, SliceExpression, SwitchExpression, TrimExpression, UnsetFieldExpression, ValueExpression, ZipExpression

public class Expression
extends Object

Base class for all the expression types.

Since:

2.0

Constructor Summary

Constructors

Constructor	Description
Expression(String operation)
Expression(String operation, Expression value)
Expression(String operation, List<Expression> value)

Method Summary

Modifier and Type	Method	Description
void	encode(Datastore datastore, BsonWriter writer, EncoderContext encoderContext)
String	getOperation()
Expression	getValue()
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

Expression

public Expression(String operation)

Expression

@MorphiaInternal
public Expression(String operation,
                  Expression value)

Parameters:

operation - the expression name

value - the value

Developer note.

This is an internal item. Its function and presence are subject to change without warning. Its use is highly discouraged.

Expression

@MorphiaInternal
public Expression(String operation,
                  List<Expression> value)

Parameters:

operation - the expression name

value - the value

Developer note.

This is an internal item. Its function and presence are subject to change without warning. Its use is highly discouraged.

Method Detail

encode

@MorphiaInternal
public void encode(Datastore datastore,
                   BsonWriter writer,
                   EncoderContext encoderContext)

Parameters:

datastore - the datastore

writer - the writer

encoderContext - the context

Developer note.

This is an internal item. Its function and presence are subject to change without warning. Its use is highly discouraged.

getOperation

@MorphiaInternal
public String getOperation()

Returns:

the value

Developer note.

This is an internal item. Its function and presence are subject to change without warning. Its use is highly discouraged.

getValue

@Nullable
@MorphiaInternal
public Expression getValue()

Returns:

the value

Developer note.

This is an internal item. Its function and presence are subject to change without warning. Its use is highly discouraged.

toString

public String toString()

Overrides:

toString in class Object