IntPerfectHash

java.lang.Object
- org.h2.dev.hash.IntPerfectHash

```
public class IntPerfectHash
extends java.lang.Object
```
A minimum perfect hash function tool. It needs about 2.2 bits per key.

Nested Class Summary

Nested Classes
Modifier and Type Class Description

static class IntPerfectHash.BitArray
A helper class for bit arrays.

Constructor Summary

Constructors
Constructor Description

IntPerfectHash(byte[] data)
Create a hash object to convert keys to hashes.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`static byte[]`	`generate(java.util.ArrayList<java.lang.Integer> list)`	Generate the minimal perfect hash function data from the given list.
`int`	`get(int x)`	Calculate the hash value for the given key.
`byte[]`	`getData()`	Get the hash function description.

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

- Constructor Detail
  - IntPerfectHash
```
public IntPerfectHash(byte[] data)
```
    Create a hash object to convert keys to hashes.
    
    Parameters:
    
    data - the data returned by the generate method
- Method Detail
  - getData
```
public byte[] getData()
```
    Get the hash function description.
    
    Returns:
    
    the data
  - get
```
public int get(int x)
```
    Calculate the hash value for the given key.
    
    Parameters:
    
    x - the key
    
    Returns:
    
    the hash value
  - generate
```
public static byte[] generate(java.util.ArrayList<java.lang.Integer> list)
```
    Generate the minimal perfect hash function data from the given list.
    
    Parameters:
    
    list - the data
    
    Returns:
    
    the hash function description