Class NaiveTxnHashMap<K,V>
- java.lang.Object
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- org.multiverse.collections.AbstractTxnMap<K,V>
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- org.multiverse.collections.NaiveTxnHashMap<K,V>
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- All Implemented Interfaces:
java.util.Map<K,V>
,TxnMap<K,V>
public final class NaiveTxnHashMap<K,V> extends AbstractTxnMap<K,V>
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Nested Class Summary
Nested Classes Modifier and Type Class Description private class
NaiveTxnHashMap.NaiveEntry<K,V>
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Field Summary
Fields Modifier and Type Field Description (package private) static int
DEFAULT_INITIAL_CAPACITY
(package private) static float
DEFAULT_LOAD_FACTOR
The load factor used when none specified in constructor.(package private) float
loadFactor
The load factor for the hash table.(package private) static int
MAXIMUM_CAPACITY
The maximum capacity, used if a higher value is implicitly specified by either of the constructors with arguments.private TxnInteger
size
private TxnRef<TxnRef<NaiveTxnHashMap.NaiveEntry>[]>
table
private TxnInteger
threshold
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Fields inherited from class org.multiverse.collections.AbstractTxnMap
defaultRefFactory, stm
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Constructor Summary
Constructors Constructor Description NaiveTxnHashMap(Stm stm)
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description (package private) void
addEntry(Txn tx, int hash, K key, V value, int bucketIndex)
void
clear(Txn tx)
Removes all of the mappings from this map (optional operation).boolean
containsKey(Txn tx, java.lang.Object key)
Returns true if this map contains a mapping for the specified key.boolean
containsValue(Txn tx, java.lang.Object value)
Returns true if this map maps one or more keys to the specified value.TxnSet<java.util.Map.Entry<K,V>>
entrySet(Txn tx)
Returns aTxnSet
view of the mappings contained in this map.V
get(Txn tx, java.lang.Object key)
Returns the value to which the specified key is mapped, ornull
if this map contains no mapping for the key.private NaiveTxnHashMap.NaiveEntry<K,V>
getEntry(Txn tx, java.lang.Object key)
float
getLoadFactor()
(package private) static int
indexFor(int h, int length)
TxnSet<K>
keySet(Txn tx)
Returns aTxnSet
view of the keys contained in this map.V
put(Txn tx, K key, V value)
Associates the specified value with the specified key in this map (optional operation).V
remove(Txn tx, java.lang.Object key)
Removes the mapping for a key from this map if it is present (optional operation).(package private) void
resize(Txn tx, int newCapacity)
int
size(Txn tx)
Returns the number of key-value mappings in this map.java.lang.String
toString(Txn tx)
(package private) void
transfer(Txn tx, TxnRef<NaiveTxnHashMap.NaiveEntry>[] newTable)
TxnCollection<V>
values(Txn tx)
Returns aTxnCollection
view of the values contained in this map.-
Methods inherited from class org.multiverse.collections.AbstractTxnMap
clear, containsKey, containsValue, entrySet, get, getStm, isEmpty, isEmpty, keySet, put, putAll, putAll, remove, size, toString, values
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Field Detail
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DEFAULT_INITIAL_CAPACITY
static final int DEFAULT_INITIAL_CAPACITY
- See Also:
- Constant Field Values
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DEFAULT_LOAD_FACTOR
static final float DEFAULT_LOAD_FACTOR
The load factor used when none specified in constructor.- See Also:
- Constant Field Values
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MAXIMUM_CAPACITY
static final int MAXIMUM_CAPACITY
The maximum capacity, used if a higher value is implicitly specified by either of the constructors with arguments. MUST be a power of two <= 1<<30.- See Also:
- Constant Field Values
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size
private final TxnInteger size
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table
private final TxnRef<TxnRef<NaiveTxnHashMap.NaiveEntry>[]> table
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threshold
private final TxnInteger threshold
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loadFactor
final float loadFactor
The load factor for the hash table.
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Constructor Detail
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NaiveTxnHashMap
public NaiveTxnHashMap(Stm stm)
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Method Detail
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getLoadFactor
public float getLoadFactor()
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clear
public void clear(Txn tx)
Description copied from interface:TxnMap
Removes all of the mappings from this map (optional operation). The map will be empty after this call returns.
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size
public int size(Txn tx)
Description copied from interface:TxnMap
Returns the number of key-value mappings in this map. If the map contains more than Integer.MAX_VALUE elements, returns Integer.MAX_VALUE.- Returns:
- the number of key-value mappings in this map
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get
public V get(Txn tx, java.lang.Object key)
Description copied from interface:TxnMap
Returns the value to which the specified key is mapped, ornull
if this map contains no mapping for the key.More formally, if this map contains a mapping from a key
k
to a valuev
such that(key==null ? k==null : key.equals(k))
, then this method returnsv
; otherwise it returnsnull
. (There can be at most one such mapping.)If this map permits null values, then a return value of
null
does not necessarily indicate that the map contains no mapping for the key; it's also possible that the map explicitly maps the key tonull
. ThecontainsKey
operation may be used to distinguish these two cases.key
- the key whose associated value is to be returned- Returns:
- the value to which the specified key is mapped, or
null
if this map contains no mapping for the key
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getEntry
private NaiveTxnHashMap.NaiveEntry<K,V> getEntry(Txn tx, java.lang.Object key)
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put
public V put(Txn tx, K key, V value)
Description copied from interface:TxnMap
Associates the specified value with the specified key in this map (optional operation). If the map previously contained a mapping for the key, the old value is replaced by the specified value. (A map m is said to contain a mapping for a key k if and only ifm.containsKey(k)
would return true.)key
- key with which the specified value is to be associatedvalue
- value to be associated with the specified key- Returns:
- the previous value associated with key, or null if there was no mapping for key. (A null return can also indicate that the map previously associated null with key, if the implementation supports null values.)
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resize
void resize(Txn tx, int newCapacity)
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transfer
void transfer(Txn tx, TxnRef<NaiveTxnHashMap.NaiveEntry>[] newTable)
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indexFor
static int indexFor(int h, int length)
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remove
public V remove(Txn tx, java.lang.Object key)
Description copied from interface:TxnMap
Removes the mapping for a key from this map if it is present (optional operation). More formally, if this map contains a mapping from key k to value v such that(key==null ? k==null : key.equals(k))
, that mapping is removed. (The map can contain at most one such mapping.)Returns the value to which this map previously associated the key, or null if the map contained no mapping for the key.
If this map permits null values, then a return value of null does not necessarily indicate that the map contained no mapping for the key; it's also possible that the map explicitly mapped the key to null.
The map will not contain a mapping for the specified key once the call returns.
key
- key whose mapping is to be removed from the map- Returns:
- the previous value associated with key, or null if there was no mapping for key.
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toString
public java.lang.String toString(Txn tx)
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entrySet
public TxnSet<java.util.Map.Entry<K,V>> entrySet(Txn tx)
Description copied from interface:TxnMap
Returns aTxnSet
view of the mappings contained in this map. The set is backed by the map, so changes to the map are reflected in the set, and vice-versa. If the map is modified while an iteration over the set is in progress (except through the iterator's own remove operation, or through the setValue operation on a map entry returned by the iterator) the results of the iteration are undefined. The set supports element removal, which removes the corresponding mapping from the map, via the Iterator.remove, Set.remove, removeAll, retainAll and clear operations. It does not support the add or addAll operations.- Returns:
- a set view of the mappings contained in this map
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keySet
public TxnSet<K> keySet(Txn tx)
Description copied from interface:TxnMap
Returns aTxnSet
view of the keys contained in this map. The set is backed by the map, so changes to the map are reflected in the set, and vice-versa. If the map is modified while an iteration over the set is in progress (except through the iterator's own remove operation), the results of the iteration are undefined. The set supports element removal, which removes the corresponding mapping from the map, via the Iterator.remove, Set.remove, removeAll, retainAll, and clear operations. It does not support the add or addAll operations.- Returns:
- a set view of the keys contained in this map
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containsKey
public boolean containsKey(Txn tx, java.lang.Object key)
Description copied from interface:TxnMap
Returns true if this map contains a mapping for the specified key. More formally, returns true if and only if this map contains a mapping for a key k such that (key==null ? k==null : key.equals(k)). (There can be at most one such mapping.)key
- key whose presence in this map is to be tested- Returns:
- true if this map contains a mapping for the specified key
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containsValue
public boolean containsValue(Txn tx, java.lang.Object value)
Description copied from interface:TxnMap
Returns true if this map maps one or more keys to the specified value. More formally, returns true if and only if this map contains at least one mapping to a value v such that (value==null ? v==null : value.equals(v)). This operation will probably require time linear in the map size for most implementations of the Map interface.value
- value whose presence in this map is to be tested- Returns:
- true if this map maps one or more keys to the specified value
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values
public TxnCollection<V> values(Txn tx)
Description copied from interface:TxnMap
Returns aTxnCollection
view of the values contained in this map. The collection is backed by the map, so changes to the map are reflected in the collection, and vice-versa. If the map is modified while an iteration over the collection is in progress (except through the iterator's own remove operation), the results of the iteration are undefined. The collection supports element removal, which removes the corresponding mapping from the map, via the Iterator.remove, Collection.remove, removeAll, retainAll and clear operations. It does not support the add or addAll operations.- Returns:
- a collection view of the values contained in this map
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