com.hp.hpl.jena.sparql.expr
Class ExprFunction

java.lang.Object
  com.hp.hpl.jena.sparql.expr.ExprNode
      com.hp.hpl.jena.sparql.expr.ExprFunction

All Implemented Interfaces:

Expr

Direct Known Subclasses:

ExprFunction0, ExprFunction1, ExprFunction2, ExprFunction3, ExprFunctionN, ExprFunctionOp

public abstract class ExprFunction
extends ExprNode

A function in the expression hierarchy. Everything that is evaluable (i.e. not NodeValue, NodeVar) is a function). It is useful to distinguish between values, vars and functions. The exists operations (which take a op, not arguments) are functions of zero arguments.

Field Summary

Fields inherited from interface com.hp.hpl.jena.sparql.expr.Expr

CMP_EQUAL, CMP_GREATER, CMP_INDETERMINATE, CMP_LESS, CMP_UNEQUAL

Method Summary

boolean	equals(Object other)
abstract Expr	getArg(int i)
List<Expr>	getArgs()
ExprFunction	getFunction() Get the function (returns null if not a function)
String	getFunctionIRI() URI for this function, whether custom or specification defined URI (these are keywords in the language)
String	getFunctionName(SerializationContext cxt) Name used in a functional form (i.e.
String	getFunctionPrintName(SerializationContext cxt) Name used for output in SPARQL format needing functional form (no specific keyword).
FunctionLabel	getFunctionSymbol() Used to get a unique name for the function, which is intern'ed.
String	getOpName() Get the symbol name (+, ! etc) for this function -- maybe null for none
int	hashCode()
boolean	isFunction() Answer wether this is a function.
abstract int	numArgs()

Methods inherited from class com.hp.hpl.jena.sparql.expr.ExprNode

applyNodeTransform, asVar, copySubstitute, copySubstitute, deepCopy, eval, getConstant, getExpr, getExprVar, getGraphPattern, getVarName, getVarNamesMentioned, getVarsMentioned, isConstant, isExpr, isGraphPattern, isSatisfied, isVariable, toString, varNamesMentioned, varsMentioned

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface com.hp.hpl.jena.sparql.expr.Expr

visit

Method Detail

getArg

public abstract Expr getArg(int i)

numArgs

public abstract int numArgs()

getArgs

public List<Expr> getArgs()

isFunction

public boolean isFunction()

Description copied from interface: Expr

Answer wether this is a function.

Specified by:

isFunction in interface Expr

Overrides:

isFunction in class ExprNode

getFunction

public ExprFunction getFunction()

Description copied from interface: Expr

Get the function (returns null if not a function)

Specified by:

getFunction in interface Expr

Overrides:

getFunction in class ExprNode

hashCode

public int hashCode()

Specified by:

hashCode in class ExprNode

equals

public boolean equals(Object other)

Specified by:

equals in class ExprNode

getFunctionPrintName

public String getFunctionPrintName(SerializationContext cxt)

Name used for output in SPARQL format needing functional form (no specific keyword). e.g. regexp(), custom functions, ...

getFunctionName

public String getFunctionName(SerializationContext cxt)

Name used in a functional form (i.e. SPARQL algebra). getOpName() is used in preference as a short, symbol name.

getFunctionSymbol

public FunctionLabel getFunctionSymbol()

Used to get a unique name for the function, which is intern'ed. Used in hashCode()

getFunctionIRI

public String getFunctionIRI()

URI for this function, whether custom or specification defined URI (these are keywords in the language)

getOpName

public String getOpName()

Get the symbol name (+, ! etc) for this function -- maybe null for none