ListUtils (Gemma 1.31.5 API)

java.lang.Object
- ubic.gemma.core.util.ListUtils

```
public class ListUtils
extends Object
```
Utilities and algorithms for List.

Author:

poirigui

Constructor Summary

Constructors
Constructor Description

ListUtils()

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static <T> List<List<T>>`	`batch(List<T> list, int batchSize)`
`static Map<String,Integer>`	`indexOfCaseInsensitiveStringElements(List<String> list)`	Get a case-insensitive mapping of string elements to their first occurrence in a `List`.
`static <T> Map<T,Integer>`	`indexOfElements(List<T> list)`	Get a mapping of element to their first occurrence in a `List`.
`static <T> List<T>`	`pad(List<T> list, T elementForPadding, int size)`	Pad a collection with the given element.
`static <T> List<T>`	`padToNextPowerOfTwo(List<T> list, T elementForPadding)`	Pad a collection to the next power of 2 with the given element.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - ListUtils
```
public ListUtils()
```
- Method Detail
  - indexOfElements
```
public static <T> Map<T,Integer> indexOfElements(List<T> list)
```
    Get a mapping of element to their first occurrence in a List. This of this as an efficient way of calling List.indexOf(Object) in a loop, since it will reduce the complexity to O(n) instead of O(n^2). I couldn't find this algorithm in Guava nor Apache Collections, but if you do, let me know!
  - indexOfCaseInsensitiveStringElements
```
public static Map<String,Integer> indexOfCaseInsensitiveStringElements(List<String> list)
```
    Get a case-insensitive mapping of string elements to their first occurrence in a List.
    
    See Also:
    
    indexOfElements(List)
  - padToNextPowerOfTwo
```
public static <T> List<T> padToNextPowerOfTwo(List<T> list,
                                              T elementForPadding)
```
    Pad a collection to the next power of 2 with the given element.
  - pad
```
public static <T> List<T> pad(List<T> list,
                              T elementForPadding,
                              int size)
```
    Pad a collection with the given element.
  - batch
```
public static <T> List<List<T>> batch(List<T> list,
                                      int batchSize)
```