de.fzi.power.interpreter.calculator.expressionoasis.custom.expressions

Class SumExpression

java.lang.Object

org.vedantatree.expressionoasis.expressions.UnaryOperatorExpression

de.fzi.power.interpreter.calculator.expressionoasis.custom.expressions.SumExpression

All Implemented Interfaces:

Expression

public final class SumExpression
extends UnaryOperatorExpression

Implementation of the (+) fold operation: All elements of the processed collection are summed up, 0 is returned in case the collection is empty.
Within expressions, this function can be used by SUM(collection).

Author:

Florian Rosenthal

Constructor Summary

Constructors

Constructor and Description
SumExpression()

Method Summary

Modifier and Type	Method and Description
Expression	getOperandExpression() Gets the operand expression for this unary operator
Type	getReturnType() Gets the return type of the expression.
ValueObject	getValue() Evaluates the expression, that is, the corresponding fold operation is executed.
void	initialize(ExpressionContext expressionContext, Object parameters, boolean validate) Initializes the operand expression.

Methods inherited from class org.vedantatree.expressionoasis.expressions.UnaryOperatorExpression

accept, toString, uninitialize

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

SumExpression

public SumExpression()

Method Detail

getReturnType

public Type getReturnType()

Description copied from interface: Expression

Gets the return type of the expression.

Specified by:

getReturnType in interface Expression

Overrides:

getReturnType in class UnaryOperatorExpression

Returns:

Type.DOUBLE.

See Also:

Expression.getReturnType()

getValue

public final ValueObject getValue()
                           throws ExpressionEngineException

Evaluates the expression, that is, the corresponding fold operation is executed.

Returns:

A ValueObject of Type.DOUBLE that contains the result of the fold operation.

Throws:

ExpressionEngineException - if there is any problem during execution

initialize

public void initialize(ExpressionContext expressionContext,
                       Object parameters,
                       boolean validate)
                throws ExpressionEngineException

Description copied from class: UnaryOperatorExpression

Initializes the operand expression.

Specified by:

initialize in interface Expression

Overrides:

initialize in class UnaryOperatorExpression

Parameters:

expressionContext - contextual information, may help in initialization

parameters - for example, sub expressions and identifiers

Throws:

AssertionError - In case the given expression context is not a CustomExpressionContext instance.

ExpressionEngineException - if there is any problem during execution

See Also:

org.vedantatree.expressionoasis.expressions.Expression#initialize(org.vedantatree.expressionoasis.ExpressionContext, java.lang.Object)

getOperandExpression

public Expression getOperandExpression()

Description copied from class: UnaryOperatorExpression

Gets the operand expression for this unary operator

Overrides:

getOperandExpression in class UnaryOperatorExpression

Returns:

Returns the operandExpression.