org.pentaho.reporting.libraries.formula.lvalues

Interface LValue

All Superinterfaces:

java.lang.Cloneable, java.io.Serializable

All Known Subinterfaces:

DataTable

All Known Implementing Classes:

AbstractLValue, ContextLookup, DefaultDataTable, FormulaFunction, PostfixTerm, PrefixTerm, StaticValue, Term

public interface LValue
extends java.io.Serializable, java.lang.Cloneable

A reference is an indirection to hide the details of where the actual value came from. The reference is responsible to report dependencies.

Author:

Thomas Morgner

Method Summary

Modifier and Type	Method and Description
java.lang.Object	clone()
TypeValuePair	evaluate()
LValue[]	getChildValues() Returns any dependent lvalues (parameters and operands, mostly).
ParsePosition	getParsePosition()
Type	getValueType() Querying the value type is only valid *after* the value has been evaluated.
void	initialize(FormulaContext context)
boolean	isConstant() Checks whether the LValue is constant.

Method Detail

initialize

void initialize(FormulaContext context)
         throws EvaluationException

Throws:

EvaluationException

evaluate

TypeValuePair evaluate()
                throws EvaluationException

Throws:

EvaluationException

clone

java.lang.Object clone()
                throws java.lang.CloneNotSupportedException

Throws:

java.lang.CloneNotSupportedException

getValueType

Type getValueType()

Querying the value type is only valid *after* the value has been evaluated.

Returns:

getChildValues

LValue[] getChildValues()

Returns any dependent lvalues (parameters and operands, mostly).

Returns:

isConstant

boolean isConstant()

Checks whether the LValue is constant. Constant lvalues always return the same value.

Returns:

getParsePosition

ParsePosition getParsePosition()