com.hp.hpl.jena.graph.query
Class Expression.BoolConstant

java.lang.Object
  com.hp.hpl.jena.graph.query.Expression.Base
      com.hp.hpl.jena.graph.query.Expression.BoolConstant

All Implemented Interfaces:

Expression, Valuator

Enclosing interface:

Expression

public static class Expression.BoolConstant
extends Expression.Base
implements Expression, Valuator

Base class used to implement TRUE and FALSE.

Nested Class Summary

Nested classes/interfaces inherited from interface com.hp.hpl.jena.graph.query.Expression

Expression.Application, Expression.Base, Expression.BoolConstant, Expression.Constant, Expression.Fixed, Expression.Util, Expression.Valof, Expression.Variable

Field Summary

Fields inherited from interface com.hp.hpl.jena.graph.query.Expression

FALSE, TRUE

Constructor Summary

Expression.BoolConstant(boolean value)

Method Summary

boolean	evalBool(IndexValues vv) Answer the evaluated value as a primitive boolean
boolean	evalBool(VariableValues vv)
Object	evalObject(IndexValues iv) Answer the evaluated value
Object	getValue() If this Expression is a literal, answer the value of that literal.
boolean	isConstant() Answer true iff this Expression represents a literal [Java object] value.
Valuator	prepare(VariableIndexes vi) Answer a Valuator which, when run with a set of index-to-value bindings, evaluates this expression in the light of the given variable-to-index bindings [ie as though the variables were bound to the corresponding values]

Methods inherited from class com.hp.hpl.jena.graph.query.Expression.Base

argCount, equals, getArg, getFun, getName, isApply, isVariable

Methods inherited from class java.lang.Object

getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface com.hp.hpl.jena.graph.query.Expression

argCount, getArg, getFun, getName, isApply, isVariable

Constructor Detail

Expression.BoolConstant

public Expression.BoolConstant(boolean value)

Method Detail

isConstant

public boolean isConstant()

Description copied from interface: Expression

Answer true iff this Expression represents a literal [Java object] value.

Specified by:

isConstant in interface Expression

Overrides:

isConstant in class Expression.Base

getValue

public Object getValue()

Description copied from interface: Expression

If this Expression is a literal, answer the value of that literal. Otherwise the behaviour is unspecified.

Specified by:

getValue in interface Expression

Overrides:

getValue in class Expression.Base

prepare

public Valuator prepare(VariableIndexes vi)

Description copied from interface: Expression

Answer a Valuator which, when run with a set of index-to-value bindings, evaluates this expression in the light of the given variable-to-index bindings [ie as though the variables were bound to the corresponding values]

Specified by:

prepare in interface Expression

evalBool

public boolean evalBool(VariableValues vv)

evalBool

public boolean evalBool(IndexValues vv)

Description copied from interface: Valuator

Answer the evaluated value as a primitive boolean

Specified by:

evalBool in interface Valuator

Parameters:

vv - the mapping from variable (indexes) to values

evalObject

public Object evalObject(IndexValues iv)

Description copied from interface: Valuator

Answer the evaluated value

Specified by:

evalObject in interface Valuator

Parameters:

iv - the mapping from variable (indexes) to values