Overview  Package   Class  Use  Deprecated  Index
Home >> All >> com >> hp >> hpl >> jena >> graph >> [ query overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

---

com.hp.hpl.jena.graph.query
Class Dyadic  

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

All Implemented Interfaces:

Expression

Direct Known Subclasses:

Rewrite.DyadicLiteral

---

public abstract class Dyadic

extends Expression.Application

A base class for dyadic expressions with a built-in Valuator; subclasses must define an evalObject or evalBool method which will be supplied with the evaluated operands.

---

Nested Class Summary

 

Nested classes inherited from class 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
protected  java.lang.String	F
protected  Expression	L
protected  Expression	R

 

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

FALSE, TRUE

 

Constructor Summary

Dyadic(Expression L, java.lang.String F, Expression R)

 

Method Summary
static Expression	and(Expression L, Expression R)
int	argCount()           If this Expression is an application, answer the number of arguments that it has.
boolean	evalBool(java.lang.Object l, java.lang.Object r)           Answer the boolean result of evaluating this dyadic expression with the given arguments l and r.
java.lang.Object	evalObject(java.lang.Object l, java.lang.Object r)           Answer the Object result of evaluating this dyadic expression with the given arguments l and r.
Expression	getArg(int i)           If this Expression is an application, and 0 <= i < argCount(), answer the ith argument.
java.lang.String	getFun()           If this Expression is an application, return the string identifying the function, which should be a URI.
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]
java.lang.String	toString()           Convert this Object to a human-readable String.

 

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

isApply

 

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

equals, getName, getValue, isConstant, isVariable

 

Methods inherited from class java.lang.Object

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

 

Field Detail

L

protected Expression L

---

R

protected Expression R

---

F

protected java.lang.String F

Constructor Detail

Dyadic

public Dyadic(Expression L,
              java.lang.String F,
              Expression R)

Method Detail

argCount

public int argCount()

Description copied from interface: Expression

If this Expression is an application, answer the number of arguments that it has. Otherwise the behaviour is unspecified.

Specified by:

argCount in interface Expression

Specified by:

argCount in class Expression.Application

---

getArg

public Expression getArg(int i)

Description copied from interface: Expression

If this Expression is an application, and 0 <= i < argCount(), answer the ith argument. Otherwise the behaviour is unspecified.

Specified by:

getArg in interface Expression

Specified by:

getArg in class Expression.Application

---

getFun

public java.lang.String getFun()

Description copied from interface: Expression

If this Expression is an application, return the string identifying the function, which should be a URI. Otherwise the behaviour is unspecified.

Specified by:

getFun in interface Expression

Specified by:

getFun in class Expression.Application

---

evalObject

public java.lang.Object evalObject(java.lang.Object l,
                                   java.lang.Object r)

Answer the Object result of evaluating this dyadic expression with the given arguments l and r. Either this method or evalBool must be over-ridden in concrete sub-classes.

---

evalBool

public boolean evalBool(java.lang.Object l,
                        java.lang.Object r)

Answer the boolean result of evaluating this dyadic expression with the given arguments l and r. Either this method or evalObject must be over-ridden in concrete sub-classes.

---

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]

---

toString

public java.lang.String toString()

Description copied from class: java.lang.Object

Convert this Object to a human-readable String. There are no limits placed on how long this String should be or what it should contain. We suggest you make it as intuitive as possible to be able to place it into System.out.println() 55 and such.

It is typical, but not required, to ensure that this method never completes abruptly with a java.lang.RuntimeException.

This method will be called when performing string concatenation with this object. If the result is null, string concatenation will instead use "null".

The default implementation returns getClass().getName() + "@" + Integer.toHexString(hashCode()).

---

and

public static Expression and(Expression L,
                             Expression R)

---

Overview  Package   Class  Use  Deprecated  Index
Home >> All >> com >> hp >> hpl >> jena >> graph >> [ query overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

---