IntHashtable (iText 7 7.0.6 API)

java.lang.Object
- com.itextpdf.io.util.IntHashtable

All Implemented Interfaces:

Serializable, Cloneable
```
public class IntHashtable
extends Object
implements Cloneable, Serializable
```
A hash map that uses primitive ints for the key rather than objects.

Note that this class is for internal optimization purposes only, and may not be supported in future releases of Jakarta Commons Lang. Utilities of this sort may be included in future releases of Jakarta Commons Collections.

Author:

Justin Couch, Alex Chaffee (alex@apache.org), Stephen Colebourne, Bruno Lowagie (change Objects as keys into int values), Paulo Soares (added extra methods)

See Also:

Serialized Form

Nested Class Summary

Nested Classes
Modifier and Type	Class and Description
`static class`	`IntHashtable.Entry` Innerclass that acts as a datastructure to create a new entry in the table.

Constructor Summary

Constructors
Constructor and Description
`IntHashtable()` Constructs a new, empty hashtable with a default capacity and load factor, which is `20` and `0.75` respectively.
`IntHashtable(int initialCapacity)` Constructs a new, empty hashtable with the specified initial capacity and default load factor, which is `0.75`.
`IntHashtable(int initialCapacity, float loadFactor)` Constructs a new, empty hashtable with the specified initial capacity and the specified load factor.
`IntHashtable(IntHashtable o)`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`void`	`clear()` Clears this hashtable so that it contains no keys.
`Object`	`clone()`
`boolean`	`contains(int value)` Tests if some key maps into the specified value in this hashtable.
`boolean`	`containsKey(int key)` Tests if the specified int is a key in this hashtable.
`boolean`	`containsValue(int value)` Returns `true` if this HashMap maps one or more keys to this value.
`int`	`get(int key)` Returns the value to which the specified key is mapped in this map.
`int[]`	`getKeys()`
`int`	`getOneKey()`
`boolean`	`isEmpty()` Tests if this hashtable maps no keys to values.
`int`	`put(int key, int value)` Maps the specified `key` to the specified `value` in this hashtable.
`protected void`	`rehash()` Increases the capacity of and internally reorganizes this hashtable, in order to accommodate and access its entries more efficiently.
`int`	`remove(int key)` Removes the key (and its corresponding value) from this hashtable.
`int`	`size()` Returns the number of keys in this hashtable.
`int[]`	`toOrderedKeys()`

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

- Constructor Detail
  - IntHashtable
```
public IntHashtable()
```
    Constructs a new, empty hashtable with a default capacity and load factor, which is 20 and 0.75 respectively.
  - IntHashtable
```
public IntHashtable(int initialCapacity)
```
    Constructs a new, empty hashtable with the specified initial capacity and default load factor, which is 0.75.
    
    Parameters:
    
    initialCapacity - the initial capacity of the hashtable.
    
    Throws:
    
    IllegalArgumentException - if the initial capacity is less than zero.
  - IntHashtable
```
public IntHashtable(int initialCapacity,
                    float loadFactor)
```
    Constructs a new, empty hashtable with the specified initial capacity and the specified load factor.
    
    Parameters:
    
    initialCapacity - the initial capacity of the hashtable.
    
    loadFactor - the load factor of the hashtable.
    
    Throws:
    
    IllegalArgumentException - if the initial capacity is less than zero, or if the load factor is nonpositive.
  - IntHashtable
```
public IntHashtable(IntHashtable o)
```
- Method Detail
  - size
```
public int size()
```
    Returns the number of keys in this hashtable.
    
    Returns:
    
    the number of keys in this hashtable.
  - isEmpty
```
public boolean isEmpty()
```
    Tests if this hashtable maps no keys to values.
    
    Returns:
    
    true if this hashtable maps no keys to values; false otherwise.
  - contains
```
public boolean contains(int value)
```
    Tests if some key maps into the specified value in this hashtable. This operation is more expensive than the containsKey method.
    
    Note that this method is identical in functionality to containsValue, (which is part of the Map interface in the collections framework).
    
    Parameters:
    
    value - a value to search for.
    
    Returns:
    
    true if and only if some key maps to the value argument in this hashtable as determined by the equals method; false otherwise.
    
    Throws:
    
    NullPointerException - if the value is null.
    
    See Also:
    
    containsKey(int), containsValue(int), Map
  - containsValue
```
public boolean containsValue(int value)
```
    Returns true if this HashMap maps one or more keys to this value.
    
    Note that this method is identical in functionality to contains (which predates the Map interface).
    
    Parameters:
    
    value - value whose presence in this HashMap is to be tested.
    
    Returns:
    
    boolean true if the value is contained
    
    See Also:
    
    Map
  - containsKey
```
public boolean containsKey(int key)
```
    Tests if the specified int is a key in this hashtable.
    
    Parameters:
    
    key - possible key.
    
    Returns:
    
    true if and only if the specified int is a key in this hashtable, as determined by the equals method; false otherwise.
    
    See Also:
    
    contains(int)
  - get
```
public int get(int key)
```
    Returns the value to which the specified key is mapped in this map.
    
    Parameters:
    
    key - a key in the hashtable.
    
    Returns:
    
    the value to which the key is mapped in this hashtable; 0 if the key is not mapped to any value in this hashtable.
    
    See Also:
    
    put(int, int)
  - rehash
```
protected void rehash()
```
    Increases the capacity of and internally reorganizes this hashtable, in order to accommodate and access its entries more efficiently.
    
    This method is called automatically when the number of keys in the hashtable exceeds this hashtable's capacity and load factor.
  - put
```
public int put(int key,
               int value)
```
    Maps the specified key to the specified value in this hashtable. The key cannot be null.
    
    The value can be retrieved by calling the get method with a key that is equal to the original key.
    
    Parameters:
    
    key - the hashtable key.
    
    value - the value.
    
    Returns:
    
    the previous value of the specified key in this hashtable, or null if it did not have one.
    
    Throws:
    
    NullPointerException - if the key is null.
    
    See Also:
    
    get(int)
  - remove
```
public int remove(int key)
```
    Removes the key (and its corresponding value) from this hashtable.
    
    This method does nothing if the key is not present in the hashtable.
    
    Parameters:
    
    key - the key that needs to be removed.
    
    Returns:
    
    the value to which the key had been mapped in this hashtable, or null if the key did not have a mapping.
  - clear
```
public void clear()
```
    Clears this hashtable so that it contains no keys.
  - toOrderedKeys
```
public int[] toOrderedKeys()
```
  - getKeys
```
public int[] getKeys()
```
  - getOneKey
```
public int getOneKey()
```
  - clone
```
public Object clone()
             throws CloneNotSupportedException
```
    Overrides:
    
    clone in class Object
    
    Throws:
    
    CloneNotSupportedException

Class IntHashtable

Nested Class Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

IntHashtable

IntHashtable

IntHashtable

IntHashtable

Method Detail

size

isEmpty

contains

containsValue

containsKey

get

rehash

put

remove

clear

toOrderedKeys

getKeys

getOneKey

clone