org.eclipse.emf.common.util

Class BasicEMap<K,V>

java.lang.Object

org.eclipse.emf.common.util.BasicEMap<K,V>

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, java.lang.Iterable<java.util.Map.Entry<K,V>>, java.util.Collection<java.util.Map.Entry<K,V>>, java.util.List<java.util.Map.Entry<K,V>>, EList<java.util.Map.Entry<K,V>>, EMap<K,V>

public class BasicEMap<K,V>
extends java.lang.Object
implements EMap<K,V>, java.lang.Cloneable, java.io.Serializable

A highly extensible map implementation.

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected class	BasicEMap.BasicEMapIterator<U> An iterator over the map entry data.
protected class	BasicEMap.BasicEMapKeyIterator An iterator over the map key data.
protected class	BasicEMap.BasicEMapValueIterator An iterator over the map value data.
protected class	BasicEMap.DelegatingMap
static interface	BasicEMap.Entry<K,V> An extended implementation interface for caching hash values and for updating an entry that may be manufactured as a uninitialized instance by a factory.
protected class	BasicEMap.EntryImpl A simple and obvious entry implementation.
protected static class	BasicEMap.View<K,V> An implementation class to hold the views.

Nested classes/interfaces inherited from interface org.eclipse.emf.common.util.EMap

EMap.InternalMapView<K,V>

Field Summary

Fields

Modifier and Type	Field and Description
protected EList<BasicEMap.Entry<K,V>>	delegateEList The underlying list of entries.
protected BasicEList<BasicEMap.Entry<K,V>>[]	entryData The array of entry lists into which the hash codes are indexed.
protected int	modCount The modification indicator used to ensure iterator integrity.
protected int	size The size of the map.
protected BasicEMap.View<K,V>	view The various alternative views of the map.

Constructor Summary

Constructors

Constructor and Description
BasicEMap() Creates an empty instance.
BasicEMap(int initialCapacity) Creates an empty instance with the given capacity.
BasicEMap(java.util.Map<? extends K,? extends V> map) Creates an instance that is a copy of the map.

Method Summary

Modifier and Type	Method and Description
void	add(int index, java.util.Map.Entry<K,V> object) Delegates to delegateEList.
boolean	add(java.util.Map.Entry<K,V> object) Delegates to delegateEList.
boolean	addAll(java.util.Collection<? extends java.util.Map.Entry<K,V>> collection) Delegates to delegateEList.
boolean	addAll(int index, java.util.Collection<? extends java.util.Map.Entry<K,V>> collection) Delegates to delegateEList.
void	clear() Delegates to delegateEList.
java.lang.Object	clone() Returns a shallow copy of this map.
boolean	contains(java.lang.Object object) Delegates to delegateEList.
boolean	containsAll(java.util.Collection<?> collection) Delegates to delegateEList.
boolean	containsKey(java.lang.Object key) Returns whether the key is associated with a value.
boolean	containsValue(java.lang.Object value) Returns whether the value is associated with a key.
protected void	didAdd(BasicEMap.Entry<K,V> entry) Called to indicate that the entry has been added.
protected void	didClear(BasicEList<BasicEMap.Entry<K,V>>[] oldEntryData) Called to indicate that the map has been cleared.
protected void	didModify(BasicEMap.Entry<K,V> entry, V oldValue) Called to indicate that the entry has an updated value.
protected void	didRemove(BasicEMap.Entry<K,V> entry) Called to indicate that the entry has been removed.
protected void	doClear() Clears the map.
protected void	doMove(BasicEMap.Entry<K,V> entry) Increments the modification count.
protected void	doPut(BasicEMap.Entry<K,V> entry) Adds the new entry to the map.
protected void	doRemove(BasicEMap.Entry<K,V> entry) Removes the entry from the map.
protected void	ensureEntryDataExists() Ensures that the entry data is created and is populated with contents of the delegate list.
protected BasicEMap.Entry<K,V>	entryForKey(int index, int hash, java.lang.Object key) Called to return the entry given the index, the hash, and the key.
protected int	entryIndexForKey(int index, int hash, java.lang.Object key) Called to return the entry list index given the index, the hash, and the key.
java.util.Set<java.util.Map.Entry<K,V>>	entrySet() Returns a set view of the entries.
boolean	equals(java.lang.Object object)
BasicEMap.Entry<K,V>	get(int index) Delegates to delegateEList.
V	get(java.lang.Object key) Returns the value associated with the key.
protected boolean	grow(int minimumCapacity) Grows the capacity of the map to ensure that no additional growth is needed until the size exceeds the specified minimum capacity.
int	hashCode()
protected int	hashOf(java.lang.Object key) Called to return the hash code of the key.
protected int	indexOf(int hash) Called to return the entry data index corresponding to the hash code.
int	indexOf(java.lang.Object object) Delegates to delegateEList.
int	indexOfKey(java.lang.Object key) Returns the index in the list of the entry with the given key, or -1, if there is no such entry.
protected void	initializeDelegateEList() Initializes the delegateEList.
boolean	isEmpty() Returns whether the map has zero size.
java.util.Iterator<java.util.Map.Entry<K,V>>	iterator() Delegates to delegateEList.
java.util.Set<K>	keySet() Returns a set view of the keys of the entries.
int	lastIndexOf(java.lang.Object object) Delegates to delegateEList.
java.util.ListIterator<java.util.Map.Entry<K,V>>	listIterator() Delegates to delegateEList.
java.util.ListIterator<java.util.Map.Entry<K,V>>	listIterator(int index) Delegates to delegateEList.
java.util.Map<K,V>	map() Returns a map view.
java.util.Map.Entry<K,V>	move(int targetIndex, int sourceIndex) Delegates to delegateEList.
void	move(int index, java.util.Map.Entry<K,V> object) Delegates to delegateEList.
protected BasicEMap.Entry<K,V>	newEntry(int hash, K key, V value) Returns a new entry.
protected BasicEList<BasicEMap.Entry<K,V>>[]	newEntryData(int capacity) Returns new allocated entry data storage.
protected BasicEList<BasicEMap.Entry<K,V>>	newList() Returns a new allocated list of entries.
V	put(K key, V value) Associates the key with the value and returns the value previously associated with the key, or null.
void	putAll(EMap<? extends K,? extends V> map) Puts each Map.Entry of the given map into this one.
void	putAll(java.util.Map<? extends K,? extends V> map) Puts each Map.Entry of the given map into this one.
protected V	putEntry(BasicEMap.Entry<K,V> entry, V value) Sets the value of the entry, and returns the former value.
java.util.Map.Entry<K,V>	remove(int index) Delegates to delegateEList.
boolean	remove(java.lang.Object object) Delegates to delegateEList.
boolean	removeAll(java.util.Collection<?> collection) Delegates to delegateEList.
protected V	removeEntry(int index, int entryIndex) Removes the fully indexed entry from the map and returns it's value.
V	removeKey(java.lang.Object key) Disassociates the key from its value, and returns the value formerly associated with the key.
protected V	resolve(K key, V value) Resolves the value associated with the key and returns the result.
boolean	retainAll(java.util.Collection<?> collection) Delegates to delegateEList.
java.util.Map.Entry<K,V>	set(int index, java.util.Map.Entry<K,V> object) Delegates to delegateEList.
int	size() Returns the number of entries in the map.
java.util.List<java.util.Map.Entry<K,V>>	subList(int start, int end) Delegates to delegateEList.
java.lang.Object[]	toArray() Delegates to delegateEList.
<T> T[]	toArray(T[] array) Delegates to delegateEList.
java.lang.String	toString() Delegates to delegateEList.
protected boolean	useEqualsForKey() Returns whether equals rather than == should be used to compare keys.
protected boolean	useEqualsForValue() Returns whether equals rather than == should be used to compare values.
protected void	validateKey(K key) Validates a new key.
protected void	validateValue(V value) Validates a new key.
java.util.Collection<V>	values() Returns a collection view the values of the entries.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.List

replaceAll, sort, spliterator

Methods inherited from interface java.util.Collection

parallelStream, removeIf, stream

Methods inherited from interface java.lang.Iterable

forEach

Field Detail

delegateEList

protected transient EList<BasicEMap.Entry<K,V>> delegateEList

The underlying list of entries.

size

protected transient int size

The size of the map.

entryData

protected transient BasicEList<BasicEMap.Entry<K,V>>[] entryData

The array of entry lists into which the hash codes are indexed.

modCount

protected transient int modCount

The modification indicator used to ensure iterator integrity.

view

protected transient BasicEMap.View<K,V> view

The various alternative views of the map.

Constructor Detail

BasicEMap

public BasicEMap()

Creates an empty instance.

BasicEMap

public BasicEMap(int initialCapacity)

Creates an empty instance with the given capacity.

Parameters:

initialCapacity - the initial capacity of the map before it must grow.

Throws:

java.lang.IllegalArgumentException - if the initialCapacity is negative.

BasicEMap

public BasicEMap(java.util.Map<? extends K,? extends V> map)

Creates an instance that is a copy of the map.

Parameters:

map - the initial contents of the map.

Method Detail

initializeDelegateEList

protected void initializeDelegateEList()

Initializes the delegateEList. This implementation illustrates the precise pattern that is used to delegate a list implementation's callback methods to the map implementation.

newEntryData

protected BasicEList<BasicEMap.Entry<K,V>>[] newEntryData(int capacity)

Returns new allocated entry data storage. Clients may override this to create typed storage, but it's not likely. The cost of type checking via a typed array is negligible.

Parameters:

capacity - the capacity of storage needed.

Returns:

new entry data storage.

ensureEntryDataExists

protected void ensureEntryDataExists()

Ensures that the entry data is created and is populated with contents of the delegate list.

newList

protected BasicEList<BasicEMap.Entry<K,V>> newList()

Returns a new allocated list of entries. Clients may override this to create typed storage. The cost of type checking via a typed array is negligible. The type must be kept in synch with newEntry.

Returns:

a new list of entries.

See Also:

newEntry(int, Object, Object)

newEntry

protected BasicEMap.Entry<K,V> newEntry(int hash,
                                        K key,
                                        V value)

Returns a new entry. The key is validated and the value is validated. Clients may override this to create typed storage. The type must be kept in synch with newEntry.

Parameters:

hash - the cached hash code of the key.

key - the key.

value - the value.

Returns:

a new entry.

See Also:

newList()

putEntry

protected V putEntry(BasicEMap.Entry<K,V> entry,
                     V value)

Sets the value of the entry, and returns the former value. The value is validated.

Parameters:

entry - the entry.

value - the value.

Returns:

the former value, or null.

useEqualsForKey

protected boolean useEqualsForKey()

Returns whether equals rather than == should be used to compare keys. The default is to return true but clients can optimize performance by returning false. The performance difference is highly significant.

Returns:

whether equals rather than == should be used to compare keys.

useEqualsForValue

protected boolean useEqualsForValue()

Returns whether equals rather than == should be used to compare values. The default is to return true but clients can optimize performance by returning false. The performance difference is highly significant.

Returns:

whether equals rather than == should be used to compare values.

resolve

protected V resolve(K key,
                    V value)

Resolves the value associated with the key and returns the result. This implementation simply returns the value; clients can use this to transform objects as they are fetched.

Parameters:

key - the key of an entry.

value - the value of an entry.

Returns:

the resolved value.

validateKey

protected void validateKey(K key)

Validates a new key. This implementation does nothing, but clients may throw runtime exceptions in order to handle constraint violations.

Parameters:

key - the new key.

Throws:

java.lang.IllegalArgumentException - if a constraint prevents the object from being added.

validateValue

protected void validateValue(V value)

Validates a new key. This implementation does nothing, but clients may throw runtime exceptions in order to handle constraint violations.

Parameters:

value - the new value.

Throws:

java.lang.IllegalArgumentException - if a constraint prevents the object from being added.

didAdd

protected void didAdd(BasicEMap.Entry<K,V> entry)

Called to indicate that the entry has been added. This implementation does nothing; clients can use this to monitor additions to the map.

Parameters:

entry - the added entry.

didModify

protected void didModify(BasicEMap.Entry<K,V> entry,
                         V oldValue)

Called to indicate that the entry has an updated value. This implementation does nothing; clients can use this to monitor value changes in the map.

Parameters:

entry - the new entry.

didRemove

protected void didRemove(BasicEMap.Entry<K,V> entry)

Called to indicate that the entry has been removed. This implementation does nothing; clients can use this to monitor removals from the map.

Parameters:

entry - the removed entry.

didClear

protected void didClear(BasicEList<BasicEMap.Entry<K,V>>[] oldEntryData)

Called to indicate that the map has been cleared. This implementation does calls didRemove for each entry; clients can use this to monitor clearing of the map.

Parameters:

oldEntryData - the removed entries.

size

public int size()

Returns the number of entries in the map.

Specified by:

size in interface java.util.Collection<java.util.Map.Entry<K,V>>

Specified by:

size in interface java.util.List<java.util.Map.Entry<K,V>>

Returns:

the number of entries in the map.

isEmpty

public boolean isEmpty()

Returns whether the map has zero size.

Specified by:

isEmpty in interface java.util.Collection<java.util.Map.Entry<K,V>>

Specified by:

isEmpty in interface java.util.List<java.util.Map.Entry<K,V>>

Returns:

whether the map has zero size.

indexOfKey

public int indexOfKey(java.lang.Object key)

Description copied from interface: EMap

Returns the index in the list of the entry with the given key, or -1, if there is no such entry.

Specified by:

indexOfKey in interface EMap<K,V>

Parameters:

key - a key.

Returns:

the index of the entry with the given key.

containsKey

public boolean containsKey(java.lang.Object key)

Description copied from interface: EMap

Returns whether the key is associated with a value.

Specified by:

containsKey in interface EMap<K,V>

Parameters:

key - a key associated with a value.

Returns:

whether the key is associated with a value.

containsValue

public boolean containsValue(java.lang.Object value)

Description copied from interface: EMap

Returns whether the value is associated with a key.

Specified by:

containsValue in interface EMap<K,V>

Parameters:

value - a value associated with a key.

Returns:

whether the value is associated with a key.

get

public V get(java.lang.Object key)

Description copied from interface: EMap

Returns the value associated with the key. The key, the value, or both may be null.

Specified by:

get in interface EMap<K,V>

Parameters:

key - the key of the value.

Returns:

the value associated with the key.

put

public V put(K key,
             V value)

Description copied from interface: EMap

Associates the key with the value and returns the value previously associated with the key, or null. The key, the value, or both may be null. Either the existing entry is updated, or a new entry is added to the end of the list.

Specified by:

put in interface EMap<K,V>

Parameters:

key - the key of the value.

value - the value associated with the key.

Returns:

the value formerly associated with the key, or null.

doPut

protected void doPut(BasicEMap.Entry<K,V> entry)

Adds the new entry to the map.

Parameters:

entry - the new entry.

removeKey

public V removeKey(java.lang.Object key)

Description copied from interface: EMap

Disassociates the key from its value, and returns the value formerly associated with the key. An entry is removed from the list, if the key is found.

Specified by:

removeKey in interface EMap<K,V>

Parameters:

key - the key of a value.

Returns:

the value formerly associated with the key.

doRemove

protected void doRemove(BasicEMap.Entry<K,V> entry)

Removes the entry from the map.

Parameters:

entry - an entry in the map.

removeEntry

protected V removeEntry(int index,
                        int entryIndex)

Removes the fully indexed entry from the map and returns it's value.

Parameters:

index - the index in the entry data

entryIndex - the index in the list of entries.

Returns:

the value of the entry.

putAll

public void putAll(java.util.Map<? extends K,? extends V> map)

Description copied from interface: EMap

Puts each Map.Entry of the given map into this one.

Specified by:

putAll in interface EMap<K,V>

Parameters:

map - the map of entries.

See Also:

EMap.put(K, V)

putAll

public void putAll(EMap<? extends K,? extends V> map)

Description copied from interface: EMap

Puts each Map.Entry of the given map into this one.

Specified by:

putAll in interface EMap<K,V>

Parameters:

map - the map of entries.

See Also:

EMap.put(K, V)

doClear

protected void doClear()

Clears the map.

doMove

protected void doMove(BasicEMap.Entry<K,V> entry)

Increments the modification count.

clone

public java.lang.Object clone()

Returns a shallow copy of this map.

Overrides:

clone in class java.lang.Object

Returns:

a shallow copy of this map.

map

public java.util.Map<K,V> map()

Description copied from interface: EMap

Returns a map view.

Specified by:

map in interface EMap<K,V>

Returns:

a map view.

keySet

public java.util.Set<K> keySet()

Description copied from interface: EMap

Returns a set view of the keys of the entries.

Specified by:

keySet in interface EMap<K,V>

Returns:

a set view of the keys of the entries.

values

public java.util.Collection<V> values()

Description copied from interface: EMap

Returns a collection view the values of the entries.

Specified by:

values in interface EMap<K,V>

Returns:

a collection view the values of the entries.

entrySet

public java.util.Set<java.util.Map.Entry<K,V>> entrySet()

Description copied from interface: EMap

Returns a set view of the entries.

Specified by:

entrySet in interface EMap<K,V>

Returns:

a set view of the entries.

hashOf

protected int hashOf(java.lang.Object key)

Called to return the hash code of the key.

Parameters:

key - the key.

Returns:

the hash code of the object.

indexOf

protected int indexOf(int hash)

Called to return the entry data index corresponding to the hash code.

Parameters:

hash - the hash code.

Returns:

the index corresponding to the hash code.

entryForKey

protected BasicEMap.Entry<K,V> entryForKey(int index,
                                           int hash,
                                           java.lang.Object key)

Called to return the entry given the index, the hash, and the key.

Parameters:

index - the entry data index of the key.

hash - the hash code of the key.

key - the key.

Returns:

the entry.

entryIndexForKey

protected int entryIndexForKey(int index,
                               int hash,
                               java.lang.Object key)

Called to return the entry list index given the index, the hash, and the key.

Parameters:

index - the entry data index of the key.

hash - the hash code of the key.

key - the key.

Returns:

the entry list index.

grow

protected boolean grow(int minimumCapacity)

Grows the capacity of the map to ensure that no additional growth is needed until the size exceeds the specified minimum capacity.

contains

public boolean contains(java.lang.Object object)

Delegates to delegateEList.

Specified by:

contains in interface java.util.Collection<java.util.Map.Entry<K,V>>

Specified by:

contains in interface java.util.List<java.util.Map.Entry<K,V>>

containsAll

public boolean containsAll(java.util.Collection<?> collection)

Delegates to delegateEList.

Specified by:

containsAll in interface java.util.Collection<java.util.Map.Entry<K,V>>

Specified by:

containsAll in interface java.util.List<java.util.Map.Entry<K,V>>

indexOf

public int indexOf(java.lang.Object object)

Delegates to delegateEList.

Specified by:

indexOf in interface java.util.List<java.util.Map.Entry<K,V>>

lastIndexOf

public int lastIndexOf(java.lang.Object object)

Delegates to delegateEList.

Specified by:

lastIndexOf in interface java.util.List<java.util.Map.Entry<K,V>>

toArray

public java.lang.Object[] toArray()

Delegates to delegateEList.

Specified by:

toArray in interface java.util.Collection<java.util.Map.Entry<K,V>>

Specified by:

toArray in interface java.util.List<java.util.Map.Entry<K,V>>

toArray

public <T> T[] toArray(T[] array)

Delegates to delegateEList.

Specified by:

toArray in interface java.util.Collection<java.util.Map.Entry<K,V>>

Specified by:

toArray in interface java.util.List<java.util.Map.Entry<K,V>>

get

public BasicEMap.Entry<K,V> get(int index)

Delegates to delegateEList.

Specified by:

get in interface java.util.List<java.util.Map.Entry<K,V>>

set

public java.util.Map.Entry<K,V> set(int index,
                                    java.util.Map.Entry<K,V> object)

Delegates to delegateEList.

Specified by:

set in interface java.util.List<java.util.Map.Entry<K,V>>

add

public boolean add(java.util.Map.Entry<K,V> object)

Delegates to delegateEList.

Specified by:

add in interface java.util.Collection<java.util.Map.Entry<K,V>>

Specified by:

add in interface java.util.List<java.util.Map.Entry<K,V>>

add

public void add(int index,
                java.util.Map.Entry<K,V> object)

Delegates to delegateEList.

Specified by:

add in interface java.util.List<java.util.Map.Entry<K,V>>

addAll

public boolean addAll(java.util.Collection<? extends java.util.Map.Entry<K,V>> collection)

Delegates to delegateEList.

Specified by:

addAll in interface java.util.Collection<java.util.Map.Entry<K,V>>

Specified by:

addAll in interface java.util.List<java.util.Map.Entry<K,V>>

addAll

public boolean addAll(int index,
                      java.util.Collection<? extends java.util.Map.Entry<K,V>> collection)

Delegates to delegateEList.

Specified by:

addAll in interface java.util.List<java.util.Map.Entry<K,V>>

remove

public boolean remove(java.lang.Object object)

Delegates to delegateEList.

Specified by:

remove in interface java.util.Collection<java.util.Map.Entry<K,V>>

Specified by:

remove in interface java.util.List<java.util.Map.Entry<K,V>>

removeAll

public boolean removeAll(java.util.Collection<?> collection)

Delegates to delegateEList.

Specified by:

removeAll in interface java.util.Collection<java.util.Map.Entry<K,V>>

Specified by:

removeAll in interface java.util.List<java.util.Map.Entry<K,V>>

remove

public java.util.Map.Entry<K,V> remove(int index)

Delegates to delegateEList.

Specified by:

remove in interface java.util.List<java.util.Map.Entry<K,V>>

retainAll

public boolean retainAll(java.util.Collection<?> collection)

Delegates to delegateEList.

Specified by:

retainAll in interface java.util.Collection<java.util.Map.Entry<K,V>>

Specified by:

retainAll in interface java.util.List<java.util.Map.Entry<K,V>>

clear

public void clear()

Delegates to delegateEList.

Specified by:

clear in interface java.util.Collection<java.util.Map.Entry<K,V>>

Specified by:

clear in interface java.util.List<java.util.Map.Entry<K,V>>

move

public void move(int index,
                 java.util.Map.Entry<K,V> object)

Delegates to delegateEList.

Specified by:

move in interface EList<java.util.Map.Entry<K,V>>

Parameters:

index - the position of the object after the move.

object - the object to move.

move

public java.util.Map.Entry<K,V> move(int targetIndex,
                                     int sourceIndex)

Delegates to delegateEList.

Specified by:

move in interface EList<java.util.Map.Entry<K,V>>

Parameters:

targetIndex - the position of the object after the move.

sourceIndex - the position of the object before the move.

Returns:

the moved object.

iterator

public java.util.Iterator<java.util.Map.Entry<K,V>> iterator()

Delegates to delegateEList.

Specified by:

iterator in interface java.lang.Iterable<java.util.Map.Entry<K,V>>

Specified by:

iterator in interface java.util.Collection<java.util.Map.Entry<K,V>>

Specified by:

iterator in interface java.util.List<java.util.Map.Entry<K,V>>

listIterator

public java.util.ListIterator<java.util.Map.Entry<K,V>> listIterator()

Delegates to delegateEList.

Specified by:

listIterator in interface java.util.List<java.util.Map.Entry<K,V>>

listIterator

public java.util.ListIterator<java.util.Map.Entry<K,V>> listIterator(int index)

Delegates to delegateEList.

Specified by:

listIterator in interface java.util.List<java.util.Map.Entry<K,V>>

subList

public java.util.List<java.util.Map.Entry<K,V>> subList(int start,
                                                        int end)

Delegates to delegateEList.

Specified by:

subList in interface java.util.List<java.util.Map.Entry<K,V>>

hashCode

public int hashCode()

Specified by:

hashCode in interface java.util.Collection<java.util.Map.Entry<K,V>>

Specified by:

hashCode in interface java.util.List<java.util.Map.Entry<K,V>>

Overrides:

hashCode in class java.lang.Object

equals

public boolean equals(java.lang.Object object)

Specified by:

equals in interface java.util.Collection<java.util.Map.Entry<K,V>>

Specified by:

equals in interface java.util.List<java.util.Map.Entry<K,V>>

Overrides:

equals in class java.lang.Object

toString

public java.lang.String toString()

Delegates to delegateEList.

Overrides:

toString in class java.lang.Object