csheets.core.formula.util
Class Interpreter

java.lang.Object
  csheets.core.formula.util.Interpreter

All Implemented Interfaces:

ExpressionVisitor

public abstract class Interpreter
extends Object
implements ExpressionVisitor

A base-class for customized formula interpreters. The interpretation relies on the Visitor pattern, so a typical invocation would look like formula.accept(interpreter).

Author:

Einar Pehrson

Constructor Summary

Interpreter()
Creates a new interpreter.

Method Summary

abstract Value	visitBinaryOperation(BinaryOperation operation) Visits the given binary expression.
abstract Value	visitFunctionCall(FunctionCall call) Visits the given function call.
Value	visitLiteral(Literal literal) Visits the given literal.
Value	visitReference(Reference reference) Visits the given cell reference.
abstract Value	visitUnaryOperation(UnaryOperation operation) Visits the given unary expression.

Methods inherited from class java.lang.Object

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

Constructor Detail

Interpreter

public Interpreter()

Creates a new interpreter.

Method Detail

visitLiteral

public Value visitLiteral(Literal literal)

Description copied from interface: ExpressionVisitor

Visits the given literal.

Specified by:

visitLiteral in interface ExpressionVisitor

Parameters:

literal - the literal to visit

Returns:

an arbitrary object

visitUnaryOperation

public abstract Value visitUnaryOperation(UnaryOperation operation)

Description copied from interface: ExpressionVisitor

Visits the given unary expression.

Specified by:

visitUnaryOperation in interface ExpressionVisitor

Parameters:

operation - the operation to visit

Returns:

an arbitrary object

visitBinaryOperation

public abstract Value visitBinaryOperation(BinaryOperation operation)

Description copied from interface: ExpressionVisitor

Visits the given binary expression.

Specified by:

visitBinaryOperation in interface ExpressionVisitor

Parameters:

operation - the operation to visit

Returns:

an arbitrary object

visitReference

public Value visitReference(Reference reference)

Description copied from interface: ExpressionVisitor

Visits the given cell reference.

Specified by:

visitReference in interface ExpressionVisitor

Parameters:

reference - the reference to visit

Returns:

an arbitrary object

visitFunctionCall

public abstract Value visitFunctionCall(FunctionCall call)

Description copied from interface: ExpressionVisitor

Visits the given function call.

Specified by:

visitFunctionCall in interface ExpressionVisitor

Parameters:

call - the function call to visit

Returns:

an arbitrary object