edu.neu.ccs.parser
Class AbstractParser.Procedure

java.lang.Object
  |
  +--edu.neu.ccs.parser.AbstractParser.Procedure

Enclosing class:

AbstractParser

public abstract static class AbstractParser.Procedure

extends Object

Class encapsulating a procedure and its corresponding String symbol for use with a parser.

Since:

1.0

See Also:

Parser

Field Summary

int	arguments The number of arguments expected by this procedure.
String	name The name representing this procedure.

Constructor Summary

AbstractParser.Procedure(String name, int arguments)
Constructs a procedure with the given identifier and number of expected arguments.

Method Summary

protected void	checkArgs(Object[] args) Throws a ParseExpection if either the args are null or the length of args is not equal to arguments.
protected void	checkArgsAsNumeric(Object[] args) Throws a ParseExpection if either the args are null or the length of args is not equal to arguments or the elements in args are not of type XNumber.
abstract Object	procedureCall(Object[] args) Applies this procedure using the provided array of argument values and returns the result.

Methods inherited from class java.lang.Object

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

Field Detail

name

public String name

The name representing this procedure.

arguments

public int arguments

The number of arguments expected by this procedure.

Constructor Detail

AbstractParser.Procedure

public AbstractParser.Procedure(String name,
                                int arguments)

Constructs a procedure with the given identifier and number of expected arguments.

Parameters:

arguments - the expected number of arguments

Method Detail

procedureCall

public abstract Object procedureCall(Object[] args)
                              throws ParseException

Applies this procedure using the provided array of argument values and returns the result. Replaces the method named procedureCalled.

Parameters:

args - the array of argument values

ParseException

Since:

2.2

checkArgs

protected void checkArgs(Object[] args)
                  throws ParseException

Throws a ParseExpection if either the args are null or the length of args is not equal to arguments. The functionality of the 2.1 version of this method is now captured in checkArgsAsNumeric.

Parameters:

args - the array of argument values

ParseException

Since:

2.2

See Also:

checkArgsAsNumeric(Object[])

checkArgsAsNumeric

protected void checkArgsAsNumeric(Object[] args)
                           throws ParseException

Throws a ParseExpection if either the args are null or the length of args is not equal to arguments or the elements in args are not of type XNumber.

Parameters:

args - the array of argument values

ParseException

Since:

2.2

See Also:

checkArgs(Object[])