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

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

All Implemented Interfaces:

Expression

Direct Known Subclasses:

Expression.Fixed

Enclosing interface:

Expression

public abstract static class Expression.Constant
extends Expression.Base

An abstract base class for literal nodes; subclasses implement getValue().

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.Constant()

Method Summary

abstract 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.

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

prepare

Constructor Detail

Expression.Constant

public Expression.Constant()

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 abstract 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