OOscheme.visitor
Class GetLength

java.lang.Object
  OOscheme.visitor.GetLength

All Implemented Interfaces:

IListAlgo

public class GetLength
extends Object
implements IListAlgo

Computes the length of the IList host.

Field Summary

static GetLength

Singleton Singleton Pattern.

Constructor Summary

private

GetLength()

Method Summary

Object	emptyCase(IEmptyList host, Object... nu) Returns Integer(0).
Object	nonEmptyCase(INEList host, Object... nu) Return the length of the host's rest plus 1.

Methods inherited from class java.lang.Object

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

Field Detail

Singleton

public static final GetLength Singleton

Singleton Pattern.

Constructor Detail

GetLength

private GetLength()

Method Detail

emptyCase

public Object emptyCase(IEmptyList host,
                        Object... nu)

Returns Integer(0).

Specified by:

emptyCase in interface IListAlgo

Parameters:

host - an EmptyList

nu - not used

Returns:

Integer.

nonEmptyCase

public Object nonEmptyCase(INEList host,
                           Object... nu)

Return the length of the host's rest plus 1.

Specified by:

nonEmptyCase in interface IListAlgo

Parameters:

host - an NEList

nu - not used.

Returns:

Integer