org.apache.commons.collections4.bidimap

## Class AbstractOrderedBidiMapDecorator<K,V>

- java.lang.Object
- - org.apache.commons.collections4.map.AbstractIterableMap<K,V>
  - - org.apache.commons.collections4.map.AbstractMapDecorator<K,V>
    - - org.apache.commons.collections4.bidimap.AbstractBidiMapDecorator<K,V>
      - - org.apache.commons.collections4.bidimap.AbstractOrderedBidiMapDecorator<K,V>

- All Implemented Interfaces:
    Map<K,V>, BidiMap<K,V>, Get<K,V>, IterableGet<K,V>, IterableMap<K,V>, OrderedBidiMap<K,V>, OrderedMap<K,V>, Put<K,V>
  Direct Known Subclasses:
    AbstractSortedBidiMapDecorator, UnmodifiableOrderedBidiMap

      public abstract class AbstractOrderedBidiMapDecorator<K,V>
      extends AbstractBidiMapDecorator<K,V>
      implements OrderedBidiMap<K,V>

  Provides a base decorator that enables additional functionality to be added to an OrderedBidiMap via decoration.

  Methods are forwarded directly to the decorated map.

  This implementation does not perform any special processing with the map views. Instead it simply returns the inverse from the wrapped map. This may be undesirable, for example if you are trying to write a validating implementation it would provide a loophole around the validation. But, you might want that loophole, so this class is kept simple.

  Since:
    3.0
  Version:
    $Id: AbstractOrderedBidiMapDecorator.java 1686855 2015-06-22 13:00:27Z tn $

- - ### Nested Class Summary

    - ### Nested classes/interfaces inherited from interface java.util.Map

      `Map.Entry<K,V>`

  - ### Constructor Summary

    Constructors
    Modifier | Constructor and Description
    --- | ---
    `protected` | `AbstractOrderedBidiMapDecorator(OrderedBidiMap<K,V> map)` Constructor that wraps (not copies).

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `protected OrderedBidiMap<K,V>` | `decorated()` Gets the map being decorated.
    `K` | `firstKey()` Gets the first key currently in this map.
    `OrderedBidiMap<V,K>` | `inverseBidiMap()` Gets a view of this map where the keys and values are reversed.
    `K` | `lastKey()` Gets the last key currently in this map.
    `OrderedMapIterator<K,V>` | `mapIterator()` Obtains a `MapIterator` over the map.
    `K` | `nextKey(K key)` Gets the next key after the one specified.
    `K` | `previousKey(K key)` Gets the previous key before the one specified.

    - ### Methods inherited from class org.apache.commons.collections4.bidimap.AbstractBidiMapDecorator

      `getKey, removeValue, values`

    - ### Methods inherited from class org.apache.commons.collections4.map.AbstractMapDecorator

      `clear, containsKey, containsValue, entrySet, equals, get, hashCode, isEmpty, keySet, put, putAll, remove, size, toString`

    - ### Methods inherited from class java.lang.Object

      `clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

    - ### Methods inherited from interface org.apache.commons.collections4.BidiMap

      `getKey, put, removeValue, values`

    - ### Methods inherited from interface java.util.Map

      `clear, containsKey, containsValue, entrySet, equals, get, hashCode, isEmpty, keySet, putAll, remove, size`

    - ### Methods inherited from interface org.apache.commons.collections4.Put

      `clear, putAll`

    - ### Methods inherited from interface org.apache.commons.collections4.Get

      `containsKey, containsValue, entrySet, get, isEmpty, keySet, remove, size`

- - ### Constructor Detail

    - #### AbstractOrderedBidiMapDecorator

          protected AbstractOrderedBidiMapDecorator(OrderedBidiMap<K,V> map)

      Constructor that wraps (not copies).
      Parameters:
        `map` - the map to decorate, must not be null
      Throws:
        `NullPointerException` - if the collection is null

  - ### Method Detail

    - #### decorated

          protected OrderedBidiMap<K,V> decorated()

      Gets the map being decorated.
      Overrides:
        `decorated` in class `AbstractBidiMapDecorator<K,V>`
      Returns:
        the decorated map

    - #### mapIterator

          public OrderedMapIterator<K,V> mapIterator()

      Description copied from class: `AbstractIterableMap`
      Obtains a `MapIterator` over the map.

      A map iterator is an efficient way of iterating over maps. There is no need to access the entry set or use Map Entry objects.

           IterableMap map = new HashedMap();
           MapIterator it = map.mapIterator();
           while (it.hasNext()) {
             String key = it.next();
             Integer value = it.getValue();
             it.setValue(value + 1);
           }

      Specified by:
        `mapIterator` in interface `IterableGet<K,V>`
      Specified by:
        `mapIterator` in interface `OrderedMap<K,V>`
      Overrides:
        `mapIterator` in class `AbstractBidiMapDecorator<K,V>`
      Returns:
        a map iterator

    - #### firstKey

          public K firstKey()

      Description copied from interface: `OrderedMap`
      Gets the first key currently in this map.
      Specified by:
        `firstKey` in interface `OrderedMap<K,V>`
      Returns:
        the first key currently in this map

    - #### lastKey

          public K lastKey()

      Description copied from interface: `OrderedMap`
      Gets the last key currently in this map.
      Specified by:
        `lastKey` in interface `OrderedMap<K,V>`
      Returns:
        the last key currently in this map

    - #### nextKey

          public K nextKey(K key)

      Description copied from interface: `OrderedMap`
      Gets the next key after the one specified.
      Specified by:
        `nextKey` in interface `OrderedMap<K,V>`
      Parameters:
        `key` - the key to search for next from
      Returns:
        the next key, null if no match or at end

    - #### previousKey

          public K previousKey(K key)

      Description copied from interface: `OrderedMap`
      Gets the previous key before the one specified.
      Specified by:
        `previousKey` in interface `OrderedMap<K,V>`
      Parameters:
        `key` - the key to search for previous from
      Returns:
        the previous key, null if no match or at start

    - #### inverseBidiMap

          public OrderedBidiMap<V,K> inverseBidiMap()

      Description copied from interface: `BidiMap`
      Gets a view of this map where the keys and values are reversed.

      Changes to one map will be visible in the other and vice versa. This enables both directions of the map to be accessed as a `Map`.

      Implementations should seek to avoid creating a new object every time this method is called. See `AbstractMap.values()` etc. Calling this method on the inverse map should return the original.

      Specified by:
        `inverseBidiMap` in interface `BidiMap<K,V>`
      Specified by:
        `inverseBidiMap` in interface `OrderedBidiMap<K,V>`
      Overrides:
        `inverseBidiMap` in class `AbstractBidiMapDecorator<K,V>`
      Returns:
        an inverted bidirectional map

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