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## org.hibernate.util
Class IdentityMap

    java.lang.Object
      org.hibernate.util.IdentityMap

All Implemented Interfaces:
  Map

    public final class IdentityMap

extends Object
implements Map

A `Map` where keys are compared by object identity, rather than `equals()`.

Nested Class Summary
`static class` | `IdentityMap.IdentityKey`
`static class` | `IdentityMap.IdentityMapEntry`

Nested classes/interfaces inherited from interface java.util.Map
`Map.Entry`

Method Summary
`void` | `clear()`
`static Map.Entry[]` | `concurrentEntries(Map map)` Return the map entries (as instances of `Map.Entry` in a collection that is safe from concurrent modification).
`boolean` | `containsKey(Object key)`
`boolean` | `containsValue(Object val)`
`static Map` | `deserialize(Object o)` Workaround for a JDK 1.4.1 bug where `IdentityHashMap`s are not correctly deserialized.
`static List` | `entries(Map map)`
`Map.Entry[]` | `entryArray()`
`List` | `entryList()`
`Set` | `entrySet()`
`Object` | `get(Object key)`
`static Map` | `instantiate(int size)` Return a new instance of this class, with an undefined iteration order
`static Map` | `instantiateSequenced(int size)` Return a new instance of this class, with iteration order defined by the order that entries were added
`static Map` | `invert(Map map)`
`boolean` | `isEmpty()`
`Iterator` | `keyIterator()`
`static Iterator` | `keyIterator(Map map)`
`Set` | `keySet()`
`Object` | `put(Object key, Object value)`
`void` | `putAll(Map otherMap)`
`Object` | `remove(Object key)`
`static Object` | `serialize(Map map)` Workaround for a JDK 1.4.1 bug where `IdentityHashMap`s are not correctly deserialized.
`int` | `size()`
`String` | `toString()`
`Collection` | `values()`

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

Methods inherited from interface java.util.Map
`equals, hashCode`

Method Detail

### instantiate

    public static Map instantiate(int size)

  Return a new instance of this class, with an undefined iteration order

  Returns:
    Map

### instantiateSequenced

    public static Map instantiateSequenced(int size)

  Return a new instance of this class, with iteration order defined by the order that entries were added

### concurrentEntries

    public static Map.Entry[] concurrentEntries(Map map)

  Return the map entries (as instances of `Map.Entry` in a collection that is safe from concurrent modification). ie. we may safely add new instances to the underlying `Map` during iteration of the `entries()`.

  Parameters:
    `map` -
  Returns:
    Collection

### entries

    public static List entries(Map map)

### keyIterator

    public static Iterator keyIterator(Map map)

### keyIterator

    public Iterator keyIterator()

### size

    public int size()

  Specified by:
    `size` in interface `Map`

### isEmpty

    public boolean isEmpty()

  Specified by:
    `isEmpty` in interface `Map`

### containsKey

    public boolean containsKey(Object key)

  Specified by:
    `containsKey` in interface `Map`

### containsValue

    public boolean containsValue(Object val)

  Specified by:
    `containsValue` in interface `Map`

### get

    public Object get(Object key)

  Specified by:
    `get` in interface `Map`

### put

    public Object put(Object key,
                      Object value)

  Specified by:
    `put` in interface `Map`

### remove

    public Object remove(Object key)

  Specified by:
    `remove` in interface `Map`

### putAll

    public void putAll(Map otherMap)

  Specified by:
    `putAll` in interface `Map`

### clear

    public void clear()

  Specified by:
    `clear` in interface `Map`

### keySet

    public Set keySet()

  Specified by:
    `keySet` in interface `Map`

### values

    public Collection values()

  Specified by:
    `values` in interface `Map`

### entrySet

    public Set entrySet()

  Specified by:
    `entrySet` in interface `Map`

### entryList

    public List entryList()

### entryArray

    public Map.Entry[] entryArray()

### serialize

    public static Object serialize(Map map)

  Workaround for a JDK 1.4.1 bug where `IdentityHashMap`s are not correctly deserialized.

  Parameters:
    `map` -
  Returns:
    Object

### deserialize

    public static Map deserialize(Object o)

  Workaround for a JDK 1.4.1 bug where `IdentityHashMap`s are not correctly deserialized.

  Parameters:
    `o` -
  Returns:
    Map

### toString

    public String toString()

  Overrides:
    `toString` in class `Object`

### invert

    public static Map invert(Map map)

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