MapToLongKeyMapAdapter (Primitive Collections for Java API v1.2)

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PCJ API
Version 1.2

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bak.pcj.adapter
Class MapToLongKeyMapAdapter

java.lang.Object
  bak.pcj.map.AbstractLongKeyMap
      bak.pcj.adapter.MapToLongKeyMapAdapter

All Implemented Interfaces:: LongKeyMap

public class MapToLongKeyMapAdapter
extends AbstractLongKeyMap
implements LongKeyMap

This class represents adaptions of Java Collections Framework maps to primitive maps from long values to objects. The adapter is implemented as a wrapper around the map. Thus, changes to the underlying map are reflected by this map and vice versa.

Adapters from JCF maps to primitive map will fail if the JCF collection contains null keys or keys of the wrong class. However, adapters are not fast failing in the case that the underlying map should contain illegal keys. To implement fast failure would require every operation to check every key of the underlying map before doing anything. Instead validation methods are provided. They can be called using the assertion facility in the client code:

      MapToLongKeyMapAdapter s;
      ...
      assert s.validate();

or by letting the adapter throw an exception on illegal values:

      MapToLongKeyMapAdapter s;
      ...
      s.evalidate();  // Throws an exception on illegal values

Either way, validation must be invoked directly by the client code.

Since:: 1.0

Field Summary
`protected Map`	`map` The underlying map.

Constructor Summary
`MapToLongKeyMapAdapter(Map map)` Creates a new adaption to a map from long values to objects.
`MapToLongKeyMapAdapter(Map map, boolean validate)` Creates a new adaption to a map from long values to objects.

Method Summary
`void`	`clear()` Clears this map.
`boolean`	`containsKey(long key)` Indicates whether this map contains a mapping from a specified key.
`boolean`	`containsValue(Object value)` Indicates whether this map contains a mapping to a specified value.
`LongKeyMapIterator`	`entries()` Returns an iterator over the entries of this map.
`void`	`evalidate()` Validates the map underlying this adapter and throws an exception if it is invalid.
`Object`	`get(long key)` Maps a specified key to a value.
`LongSet`	`keySet()` Returns a set view of the keys of this map.
`Object`	`put(long key, Object value)` Adds a mapping from a specified key to a specified value to this map.
`Object`	`remove(long key)` Removes the mapping from a specified key from this map.
`int`	`size()` Returns the size of this map.
`boolean`	`validate()` Indicates whether the underlying map is valid for this adapter.
`Collection`	`values()` Returns a collection view of the values in this map.

Methods inherited from class bak.pcj.map.AbstractLongKeyMap

equals, hashCode, isEmpty, putAll, toString, trimToSize

Methods inherited from class java.lang.Object

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

Methods inherited from interface bak.pcj.map.LongKeyMap

equals, hashCode, isEmpty, putAll

Field Detail

map

protected Map map

The underlying map.

Constructor Detail

MapToLongKeyMapAdapter

public MapToLongKeyMapAdapter(Map map)

Creates a new adaption to a map from long values to objects.
Parameters:: map - the underlying map. This map must consist of keys of class Long. Otherwise a ClassCastException will be thrown by some methods.
Throws:: NullPointerException - if map is null.

MapToLongKeyMapAdapter

public MapToLongKeyMapAdapter(Map map,
                              boolean validate)

Creates a new adaption to a map from long values to objects. The map to adapt is optionally validated.
Parameters:: map - the underlying map. This map must consist of keys of class Long. Otherwise a ClassCastException will be thrown by some methods.; validate - indicates whether map should be checked for illegal keys.
Throws:: NullPointerException - if map is null.; IllegalStateException - if validate is true and map contains a null key or a key that is not of class Long.

Method Detail