org.mmbase.util.functions
Class IndexFunction

java.lang.Object
  org.mmbase.util.functions.FunctionProvider
      org.mmbase.util.functions.IndexFunction

public class IndexFunction
extends FunctionProvider

The index node functions can be assigned to nodes which are connected by an 'index' relation. An index relation is an extension of 'posrel', but also has an 'index' and a 'root' field. These are used to calcaluate the 'number' of the connected nodes. The 'pos' field only serves to fix the order. The index field can be empty in which case the node with the lowest pos gets number 1, the following number 2 and so on. But on any one of the index relations the index can be stated explicitely. If e.g. the index is specified 'a' then the following node will be 'b'. You can also arrange for 'i', 'ii', 'iii', 'iv' and so on. The root field (a node-type field) specifies to which tree the relations belong. So principaly the same 'chapter' can exists with several different chapter numbers. Also, it is used to define where counting must starts, because the complete number of a chapter consists of a chain of numbers (like 2.3.4.iii). If the index is specified to be '-' then that means that it is explicitely empty. That cannot be '' or otherwise unfilled, because that means 'determin automaticly' already.

Since:

MMBase-1.8

Version:

$Id: IndexFunction.java 35524 2009-05-29 13:40:17Z michiel $

Author:

Michiel Meeuwissen

Nested Class Summary

protected static class

IndexFunction.Stack<C>

Field Summary

protected static NodeFunction<String>	index
protected static Cache<String,String>	indexCache

Fields inherited from class org.mmbase.util.functions.FunctionProvider

functions, getFunctions

Constructor Summary

IndexFunction()

Method Summary

static void	main(String[] argv)
protected static String	romanSuccessor(String index) Calculates the 'successor' of a roman number, preserving uppercase/lowercase.
static String	successor(String index) Returns the 'successor' of a string.
protected static String	successor(String index, String separator, String joiner, boolean roman) Calculates the 'successor' of an index String.

Methods inherited from class org.mmbase.util.functions.FunctionProvider

addFunction, createParameters, getFunction, getFunctions, getFunctionValue, newFunctionInstance

Methods inherited from class java.lang.Object

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

Field Detail

indexCache

protected static Cache<String,String> indexCache

index

protected static NodeFunction<String> index

Constructor Detail

IndexFunction

public IndexFunction()

Method Detail

successor

public static String successor(String index)

Returns the 'successor' of a string. Which means that e.g. after 'zzz' follows 'aaaa'.

romanSuccessor

protected static String romanSuccessor(String index)

Calculates the 'successor' of a roman number, preserving uppercase/lowercase.

successor

protected static String successor(String index,
                                  String separator,
                                  String joiner,
                                  boolean roman)

Calculates the 'successor' of an index String. Like '7.4.iii' of which the successor is '7.4.iv'.

Parameters:

index - The string to succeed

separator - Regular expression to split up the string first (e.g. "\\.")

joiner - String to rejoin it again (e.g. ".")

roman - Whether to consider roman numbers

main

public static void main(String[] argv)