jacol.util
Class ListOps

java.lang.Object
  |
  +--jacol.util.ListOps

public class ListOps

extends java.lang.Object

This is a class utility for processing lists in a "lispy" manner. This is done mainly because I like to think in lisp terms even when I'm writing Java :-)

Version:

0.20 beta

Author:

Jason Lowdermilk Email

Constructor Summary

ListOps()

Method Summary

static java.lang.String	arrayToString(java.lang.Object[] ary) Convert an array of objects into a string.
static java.lang.Object	car(java.util.List list) Get the first object in a list.
static java.lang.String	listoToString(java.util.List list) Convert a list of objects to a string.
static java.lang.Class[]	listToClassArray(java.util.List list) Convert a list of Classes to an array
static java.lang.Object[]	listToObjectArray(java.util.List list) Convert a list of Objects to an array
static java.lang.Object	nth(int index, java.util.List list) Get the nth object from a list
static java.util.List	stringToList(java.lang.String string) Tokenize a String into a List.
static java.util.List	subseq(java.util.List list, int start) Get a subsection of a list.

Methods inherited from class java.lang.Object

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

Constructor Detail

ListOps

public ListOps()

Method Detail

stringToList

public static java.util.List stringToList(java.lang.String string)

Tokenize a String into a List. Tokens are delimited by spaces, except when inside quotes. 'A "B C" D' -> "A", "B C", "D"

Parameters:

string - the String to tokenize.

arrayToString

public static java.lang.String arrayToString(java.lang.Object[] ary)

Convert an array of objects into a string. Each object will be converted to a quoted string.

Parameters:

ary - an array of objects

listoToString

public static java.lang.String listoToString(java.util.List list)

Convert a list of objects to a string. Each object in the list will be converted to a quoted string.

Parameters:

list - a List of Objects.

nth

public static java.lang.Object nth(int index,
                                   java.util.List list)

Get the nth object from a list

Parameters:

index - the index of the object to retrieve, starting from 1

list - the List to retrieve from

car

public static java.lang.Object car(java.util.List list)

Get the first object in a list.

Parameters:

list - the List to retrieve from

subseq

public static java.util.List subseq(java.util.List list,
                                    int start)

Get a subsection of a list.

Parameters:

list - the List to retrieve from

start - the index, starting from 1, to start taking the subsection

Returns:

a new List containing a subset of the elements from the original list

listToClassArray

public static java.lang.Class[] listToClassArray(java.util.List list)

Convert a list of Classes to an array

Parameters:

list - a List containing Class instances

listToObjectArray

public static java.lang.Object[] listToObjectArray(java.util.List list)

Convert a list of Objects to an array

Parameters:

list - a List containing Object instances