org.openanzo.glitter.syntax.abstrakt
Class FunctionCall

java.lang.Object
  org.openanzo.glitter.syntax.abstrakt.Expression
      org.openanzo.glitter.syntax.abstrakt.FunctionCall

public class FunctionCall
extends Expression

A FunctionCall is an Expression that represents the invocation of a particular Function against a list of arguments.

Author:

lee

Constructor Summary

FunctionCall(java.lang.Class<Function> functionClass, java.util.List<Expression> arguments)
Construct a FunctionCall from a Function (class) and a list of arguments.

FunctionCall(Function f, java.util.List<Expression> arguments)
Construct a FunctionCall from a Function and a list of arguemnts.

FunctionCall(java.lang.String functionClassName, java.util.List<Expression> arguments)
Construct a FunctionCall from the name of a Function and a list of arguments.

FunctionCall(java.net.URI u, java.util.List<Expression> arguments)
Construct a FunctionCall from the name of a function (as a URI) and a list of arguments.

Method Summary

RDFTerm	evaluate(PatternSolution environment)
java.util.List<Expression>	getArguments()
Function	getFunction()
java.util.Set<Variable>	getReferencedVariables()
boolean	replaceArgument(Expression oldArgument, Expression newArgument) Replaces one argument to this function with another.

Methods inherited from class java.lang.Object

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

Constructor Detail

FunctionCall

public FunctionCall(java.lang.String functionClassName,
                    java.util.List<Expression> arguments)
             throws java.lang.ClassNotFoundException,
                    java.lang.IllegalAccessException,
                    java.lang.InstantiationException

Construct a FunctionCall from the name of a Function and a list of arguments.

Parameters:

functionClassName -

arguments -

Throws:

java.lang.ClassNotFoundException

java.lang.IllegalAccessException

java.lang.InstantiationException

FunctionCall

public FunctionCall(java.lang.Class<Function> functionClass,
                    java.util.List<Expression> arguments)
             throws java.lang.IllegalAccessException,
                    java.lang.InstantiationException

Construct a FunctionCall from a Function (class) and a list of arguments.

Parameters:

functionClass -

arguments -

Throws:

java.lang.IllegalAccessException

java.lang.InstantiationException

FunctionCall

public FunctionCall(Function f,
                    java.util.List<Expression> arguments)

Construct a FunctionCall from a Function and a list of arguemnts.

Parameters:

f -

arguments -

FunctionCall

public FunctionCall(java.net.URI u,
                    java.util.List<Expression> arguments)
             throws UnknownFunctionException

Construct a FunctionCall from the name of a function (as a URI) and a list of arguments. Finds the Function in the static FunctionRegistry.

Parameters:

u -

arguments -

Throws:

UnknownFunctionException

Method Detail

evaluate

public RDFTerm evaluate(PatternSolution environment)
                 throws ExpressionEvaluationException

Specified by:

evaluate in class Expression

Parameters:

environment - A set of bindings to use to evaluate Bindable objects in the expression.

Returns:

The RDFTerm that is the value of evaluating this expression.

Throws:

ExpressionEvaluationException - If there is an error (e.g. a type error) in evaluating this expression.

replaceArgument

public boolean replaceArgument(Expression oldArgument,
                               Expression newArgument)

Replaces one argument to this function with another. (Can be used to do, for example, constant folding.)

Parameters:

oldArgument -

newArgument -

Returns:

return true if argument was replaced

getReferencedVariables

public java.util.Set<Variable> getReferencedVariables()

Specified by:

getReferencedVariables in class Expression

Returns:

A set of all the variables that occur in this expression.

getFunction

public Function getFunction()

Returns:

the function

getArguments

public java.util.List<Expression> getArguments()

Returns:

The list of arguments to this function call.