gnu.expr
Class MethodProc

java.lang.Object
  |
  +--gnu.mapping.Procedure
        |
        +--gnu.mapping.ProcedureN
              |
              +--gnu.expr.MethodProc

Direct Known Subclasses:

GenericProc, PrimProcedure

public abstract class MethodProc

extends ProcedureN

Similar to a CLOS method. Can check if arguments "match" before committing to calling method.

Fields inherited from class gnu.mapping.Procedure

noArgs, sym_name

Constructor Summary

MethodProc()

Method Summary

java.lang.Object	applyN(java.lang.Object[] args)
abstract java.lang.Object	applyV(java.lang.Object vars)
Type	getParameterType(int index)
java.lang.Object	getVarBuffer() Return a buffer that can contain decoded (matched) arguments.
int	isApplicable(Type[] argTypes) Test if method is applicable to an invocation with given arguments.
java.lang.Object	match(java.lang.Object[] args)
abstract java.lang.RuntimeException	match(java.lang.Object vars, java.lang.Object[] args) Match the incoming arguments.
static int	mostSpecific(MethodProc[] procs, int length) Return the index of the most specific method.
static MethodProc	mostSpecific(MethodProc proc1, MethodProc proc2) Return the more specific of the arguments.
int	numParameters() Return number of paramaters, including optional and rest arguments.

Methods inherited from class gnu.mapping.ProcedureN

apply0, apply1, apply2, apply3, apply4

Methods inherited from class gnu.mapping.Procedure

apply, checkArgCount, getName, getSetter, maxArgs, minArgs, name, numArgs, print, set0, set1, setN, setName

Methods inherited from class java.lang.Object

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

Constructor Detail

MethodProc

public MethodProc()

Method Detail

getVarBuffer

public java.lang.Object getVarBuffer()

Return a buffer that can contain decoded (matched) arguments.

isApplicable

public int isApplicable(Type[] argTypes)

Test if method is applicable to an invocation with given arguments. Returns -1 if no; 1 if yes; 0 if need to check at run-time.

numParameters

public int numParameters()

Return number of paramaters, including optional and rest arguments.

getParameterType

public Type getParameterType(int index)

match

public abstract java.lang.RuntimeException match(java.lang.Object vars,
                                                 java.lang.Object[] args)

Match the incoming arguments.

Parameters:

args - the incoming argument list

vars - where to save the matched result on success

Returns:

null if the match succeeded, else an exception

match

public java.lang.Object match(java.lang.Object[] args)

applyV

public abstract java.lang.Object applyV(java.lang.Object vars)

applyN

public java.lang.Object applyN(java.lang.Object[] args)

Overrides:

applyN in class ProcedureN

mostSpecific

public static MethodProc mostSpecific(MethodProc proc1,
                                      MethodProc proc2)

Return the more specific of the arguments.

Returns:

null if neither is more specific.

mostSpecific

public static int mostSpecific(MethodProc[] procs,
                               int length)

Return the index of the most specific method.