Package org.vedantatree.expressionoasis.expressions.property

Class FunctionExpression

java.lang.Object

org.vedantatree.expressionoasis.expressions.UnaryOperatorExpression

org.vedantatree.expressionoasis.expressions.property.FunctionExpression

All Implemented Interfaces:

Expression

public class FunctionExpression
extends UnaryOperatorExpression

This is the function expression to call the functions.

Constructor Summary

Constructors

Constructor	Description
FunctionExpression()

Method Summary

Modifier and Type	Method	Description
String	getFunctionName()
Type	getReturnType()	Gets the return type of the expression.
ValueObject	getValue()	Executes and returns the value of this expression.
void	initialize(ExpressionContext expressionContext, Object parameters, boolean validate)	Initializes the operand expression.
protected void	validate(ExpressionContext expressionContext)	Validates the expression.

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

accept, addTypePair, getOperandExpression, toString, uninitialize

Methods inherited from class java.lang.Object

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

Constructor Detail

FunctionExpression

public FunctionExpression()

Method Detail

getValue

public ValueObject getValue()
                     throws ExpressionEngineException

Description copied from interface: Expression

Executes and returns the value of this expression. If expression is not at node level, it will further evaluate its related expression which may represents operands or operators and return the final outcome.

Returns:

the value of expression (after expression evaluation)

Throws:

ExpressionEngineException - if there is any problem during execution

See Also:

org.vedantatree.expressionoasis.expressions.Expression#getValue(java.lang.Object)

getReturnType

public Type getReturnType()
                   throws ExpressionEngineException

Description copied from interface: Expression

Gets the return type of the expression.

Specified by:

getReturnType in interface Expression

Overrides:

getReturnType in class UnaryOperatorExpression

Returns:

the type of expression

Throws:

ExpressionEngineException - If there is any problem during execution

See Also:

Expression.getReturnType()

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:

ExpressionEngineException - if there is any problem during execution

See Also:

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

validate

protected void validate(ExpressionContext expressionContext)
                 throws ExpressionEngineException

Description copied from class: UnaryOperatorExpression

Validates the expression.

Overrides:

validate in class UnaryOperatorExpression

Throws:

ExpressionEngineException

See Also:

org.vedantatree.expressionoasis.expressions.UnaryOperatorExpression#validate()

getFunctionName

public String getFunctionName()