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## weka.core
Class SingleIndex

    java.lang.Object
      weka.core.SingleIndex

All Implemented Interfaces:
  java.io.Serializable, RevisionHandler

    public class SingleIndex

extends java.lang.Object
implements java.io.Serializable, RevisionHandler

Class representing a single cardinal number. The number is set by a string representation such as:

`first last 1 3`

The number is internally converted from 1-based to 0-based (so methods that set or get numbers not in string format should use 0-based numbers).

Version:
  $Revision: 1.8 $
Author:
  Eibe Frank (eibe@cs.waikato.ac.nz)
See Also:
  Serialized Form

Constructor Summary
`SingleIndex()` Default constructor.
`SingleIndex(java.lang.String index)` Constructor to set initial index.

Method Summary
`int` | `getIndex()` Gets the selected index
`java.lang.String` | `getRevision()` Returns the revision string.
`java.lang.String` | `getSingleIndex()` Gets the string representing the selected range of values
`static java.lang.String` | `indexToString(int index)` Creates a string representation of the given index.
`static void` | `main(java.lang.String[] argv)` Main method for testing this class.
`void` | `setSingleIndex(java.lang.String index)` Sets the index from a string representation.
`void` | `setUpper(int newUpper)` Sets the value of "last".
`java.lang.String` | `toString()` Constructs a representation of the current range.

Methods inherited from class java.lang.Object
`equals, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Constructor Detail

### SingleIndex

    public SingleIndex()

  Default constructor.

### SingleIndex

    public SingleIndex(java.lang.String index)

  Constructor to set initial index.

  Parameters:
    `index` - the initial index
  Throws:
    `java.lang.IllegalArgumentException` - if the index is invalid

Method Detail

### setUpper

    public void setUpper(int newUpper)

  Sets the value of "last".

  Parameters:
    `newUpper` - the value of "last"

### getSingleIndex

    public java.lang.String getSingleIndex()

  Gets the string representing the selected range of values

  Returns:
    the range selection string

### setSingleIndex

    public void setSingleIndex(java.lang.String index)

  Sets the index from a string representation. Note that setUpper() must be called for the value to be actually set

  Parameters:
    `index` - the index set
  Throws:
    `java.lang.IllegalArgumentException` - if the index was not well formed

### toString

    public java.lang.String toString()

  Constructs a representation of the current range. Being a string representation, the numbers are based from 1.

  Overrides:
    `toString` in class `java.lang.Object`
  Returns:
    the string representation of the current range

### getIndex

    public int getIndex()

  Gets the selected index

  Returns:
    the selected index
  Throws:
    `java.lang.RuntimeException` - if the upper limit of the index hasn't been defined

### indexToString

    public static java.lang.String indexToString(int index)

  Creates a string representation of the given index.

  Parameters:
    `index` - the index to turn into a string. Since the index will typically come from a program, indices are assumed from 0, and thus will have 1 added in the String representation.
  Returns:
    the string representation

### getRevision

    public java.lang.String getRevision()

  Returns the revision string.

  Specified by:
    `getRevision` in interface `RevisionHandler`
  Returns:
    the revision

### main

    public static void main(java.lang.String[] argv)

  Main method for testing this class.

  Parameters:
    `argv` - one parameter: a test index specification

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