org.pentaho.reporting.libraries.formula.lvalues
Class Term

java.lang.Object
  org.pentaho.reporting.libraries.formula.lvalues.AbstractLValue
      org.pentaho.reporting.libraries.formula.lvalues.Term

All Implemented Interfaces:

Serializable, Cloneable, LValue

public class Term
extends AbstractLValue

An term is a list of LValues connected by operators. For the sake of efficiency, this is not stored as tree. We store the term as a list in the following format: (headValue)(OP value)* ...

Author:

Thomas Morgner

See Also:

Serialized Form

Constructor Summary

Term(LValue headValue)

Method Summary

void	add(InfixOperator operator, LValue operand)
Object	clone()
TypeValuePair	evaluate()
LValue[]	getChildValues() Returns any dependent lvalues (parameters and operands, mostly).
LValue	getHeadValue()
LValue[]	getOperands()
InfixOperator[]	getOperators()
LValue	getOptimizedHeadValue() Allows access to the post optimized head value note that without the optimization, it's difficult to traverse libformula's object model.
ParsePosition	getParsePosition()
void	initialize(FormulaContext context)
boolean	isConstant() Checks whether the LValue is constant.
String	toString()

Methods inherited from class org.pentaho.reporting.libraries.formula.lvalues.AbstractLValue

getContext, getValueType, setParsePosition

Methods inherited from class java.lang.Object

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

Constructor Detail

Term

public Term(LValue headValue)

Method Detail

evaluate

public TypeValuePair evaluate()
                       throws EvaluationException

Throws:

EvaluationException

add

public void add(InfixOperator operator,
                LValue operand)

initialize

public void initialize(FormulaContext context)
                throws EvaluationException

Specified by:

initialize in interface LValue

Overrides:

initialize in class AbstractLValue

Throws:

EvaluationException

getChildValues

public LValue[] getChildValues()

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

Specified by:

getChildValues in interface LValue

Overrides:

getChildValues in class AbstractLValue

Returns:

toString

public String toString()

Overrides:

toString in class Object

isConstant

public boolean isConstant()

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

Returns:

clone

public Object clone()
             throws CloneNotSupportedException

Specified by:

clone in interface LValue

Overrides:

clone in class AbstractLValue

Throws:

CloneNotSupportedException

getOperands

public LValue[] getOperands()

getOperators

public InfixOperator[] getOperators()

getHeadValue

public LValue getHeadValue()

getOptimizedHeadValue

public LValue getOptimizedHeadValue()

Allows access to the post optimized head value note that without the optimization, it's difficult to traverse libformula's object model.

Returns:

optimized head value

getParsePosition

public ParsePosition getParsePosition()

Specified by:

getParsePosition in interface LValue

Overrides:

getParsePosition in class AbstractLValue