bak.pcj.adapter
Class ObjectKeyDoubleMapToMapAdapter

java.lang.Object
  bak.pcj.adapter.ObjectKeyDoubleMapToMapAdapter

All Implemented Interfaces:

Map

public class ObjectKeyDoubleMapToMapAdapter

extends Object

implements Map

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

Since:

1.1

See Also:

ObjectKeyDoubleMap, Map

Field Summary

protected ObjectKeyDoubleMap

map The underlying primitive map.

Constructor Summary

ObjectKeyDoubleMapToMapAdapter(ObjectKeyDoubleMap map)
Creates a new adaption of a primitive map of object keys and double values to a Java Collections Framework map.

Method Summary

void	clear() Clears this map.
boolean	containsKey(Object 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.
Set	entrySet() Returns a set view of the entries of this map.
boolean	equals(Object obj) Indicates whether this map is equal to some object.
Object	get(Object key) Maps a specified key to a value.
int	hashCode() Returns a hash code value for this map.
boolean	isEmpty() Indicates whether this map is empty.
Set	keySet() Returns a set view of the keys of this map.
Object	put(Object key, Object value) Adds a mapping from a specified key to a specified value to this map.
void	putAll(Map map) Adds all mappings from a specified map to this map.
Object	remove(Object key) Removes the mapping from a specified key from this map.
int	size() Returns the size of this map.
Collection	values() Returns a collection view of the values in this map.

Methods inherited from class java.lang.Object

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

Field Detail

map

protected ObjectKeyDoubleMap map

The underlying primitive map.

Constructor Detail

ObjectKeyDoubleMapToMapAdapter

public ObjectKeyDoubleMapToMapAdapter(ObjectKeyDoubleMap map)
                               throws NullPointerException

Creates a new adaption of a primitive map of object keys and double values to a Java Collections Framework map.

Parameters:

map - the underlying primitive map.

Throws:

NullPointerException - if map is null.

Method Detail

clear

public void clear()

Clears this map. The underlying map is cleared.

Specified by:

clear in interface Map

Throws:

UnsupportedOperationException - if the operation is not supported by the underlying map.

containsKey

public boolean containsKey(Object key)

Indicates whether this map contains a mapping from a specified key. This is so, only if the underlying collection contains the unwrapped key.

Specified by:

containsKey in interface Map

Parameters:

key - the key to test for.

Returns:

true if this map contains a mapping from the specified key; returns false otherwise.

containsValue

public boolean containsValue(Object value)

Indicates whether this map contains a mapping to a specified value. For this map to contain an object, the underlying map must contain its unwrapped value.

Note that this map can never contain null values or values of other classes than Double. In those cases, this method will return false.

Specified by:

containsValue in interface Map

Parameters:

value - the value to test for.

Returns:

true if this map contains at least one mapping to the specified value; returns false otherwise.

entrySet

public Set entrySet()

Returns a set view of the entries of this map. The returned set is a view, so changes to this map are reflected by the returned set and vice versa. All elements of the returned set implements java.util.Map.Entry.

Specified by:

entrySet in interface Map

Returns:

a set view of the entries of this map.

equals

public boolean equals(Object obj)

Indicates whether this map is equal to some object.

Specified by:

equals in interface Map

Parameters:

obj - the object with which to compare this map.

Returns:

true if this map is equal to the specified object; returns false otherwise.

get

public Object get(Object key)

Maps a specified key to a value. Returns null if no mapping exists for the specified key. The returned value will always be of class .

Specified by:

get in interface Map

Parameters:

key - the key to map to a value.

Returns:

the value that the specified key maps to, or null, if no such mapping exists.

hashCode

public int hashCode()

Returns a hash code value for this map. The hash code returned is that of the underlying map.

Specified by:

hashCode in interface Map

Returns:

a hash code value for this map.

isEmpty

public boolean isEmpty()

Indicates whether this map is empty.

Specified by:

isEmpty in interface Map

Returns:

true if this map is empty; returns false otherwise.

keySet

public Set keySet()

Returns a set view of the keys of this map. Removals from the returned set removes the corresponding entries in this map. Changes to the map are reflected in the set.

Specified by:

keySet in interface Map

Returns:

a set view of the keys of this map.

put

public Object put(Object key,
                  Object value)
           throws NullPointerException,
                  ClassCastException

Adds a mapping from a specified key to a specified value to this map. If a mapping already exists for the specified key it is overwritten by the new mapping. The mapping is added to the underlying map.

Specified by:

put in interface Map

Parameters:

key - the key of the mapping to add to this map.

value - the value of the mapping to add to this map.

Returns:

the old value if a mapping from the specified key already existed in this map; returns null otherwise.

Throws:

UnsupportedOperationException - if the operation is not supported by this map.

NullPointerException - if value is null.

ClassCastException - if value is not of class Double.

putAll

public void putAll(Map map)
            throws NullPointerException,
                   ClassCastException

Adds all mappings from a specified map to this map. Any existing mappings whose keys collide with a new mapping is overwritten by the new mapping. The mappings are added to the underlying map.

Specified by:

putAll in interface Map

Parameters:

map - the map whose mappings to add to this map.

Throws:

NullPointerException - if map is null.

UnsupportedOperationException - if the operation is not supported by this map.

NullPointerException - if a value in map is null.

ClassCastException - if a value in value is not of class Double.

remove

public Object remove(Object key)

Removes the mapping from a specified key from this map. The mapping is removed from the underlying map.

Specified by:

remove in interface Map

Parameters:

key - the key whose mapping to remove from this map.

Returns:

the old value if a mapping from the specified key already existed in this map; returns null otherwise.

Throws:

UnsupportedOperationException - if the operation is not supported by the underlying map.

size

public int size()

Returns the size of this map. The size is defined as the number of mappings from keys to values. The size is that of the underlying map.

Specified by:

size in interface Map

Returns:

the size of this map.

values

public Collection values()

Returns a collection view of the values in this map. The collection is not modifiable, but changes to the map are reflected in the collection. All elements in the returned set is of class Double.

Specified by:

values in interface Map

Returns:

a collection view of the values in this map.