Package it.unimi.dsi.fastutil.bytes

Class Byte2ByteLinkedOpenHashMap

java.lang.Object

it.unimi.dsi.fastutil.bytes.AbstractByte2ByteFunction

it.unimi.dsi.fastutil.bytes.AbstractByte2ByteMap

it.unimi.dsi.fastutil.bytes.AbstractByte2ByteSortedMap

it.unimi.dsi.fastutil.bytes.Byte2ByteLinkedOpenHashMap

All Implemented Interfaces:

Byte2ByteFunction, Byte2ByteMap, Byte2ByteSortedMap, Function<Byte,Byte>, Hash, Serializable, Cloneable, Function<Byte,Byte>, IntUnaryOperator, Map<Byte,Byte>, SequencedMap<Byte,Byte>, SortedMap<Byte,Byte>

public class Byte2ByteLinkedOpenHashMap
extends AbstractByte2ByteSortedMap
implements Serializable, Cloneable, Hash

A type-specific linked hash map with with a fast, small-footprint implementation.

Instances of this class use a hash table to represent a map. The table is filled up to a specified load factor, and then doubled in size to accommodate new entries. If the table is emptied below one fourth of the load factor, it is halved in size; however, the table is never reduced to a size smaller than that at creation time: this approach makes it possible to create maps with a large capacity in which insertions and deletions do not cause immediately rehashing. Moreover, halving is not performed when deleting entries from an iterator, as it would interfere with the iteration process.

Note that clear() does not modify the hash table size. Rather, a family of trimming methods lets you control the size of the table; this is particularly useful if you reuse instances of this class.

Entries returned by the type-specific Byte2ByteMap.entrySet() method implement the suitable type-specific Pair interface; only values are mutable.

Iterators generated by this map will enumerate pairs in the same order in which they have been added to the map (addition of pairs whose key is already present in the map does not change the iteration order). Note that this order has nothing in common with the natural order of the keys. The order is kept by means of a doubly linked list, represented via an array of longs parallel to the table.

This class implements the interface of a sorted map, so to allow easy access of the iteration order: for instance, you can get the first key in iteration order with firstKey() without having to create an iterator; however, this class partially violates the SortedMap contract because all submap methods throw an exception and comparator() returns always null.

Additional methods, such as getAndMoveToFirst(), make it easy to use instances of this class as a cache (e.g., with LRU policy).

The iterators provided by the views of this class using are type-specific list iterators, and can be started at any element which is a key of the map, or a NoSuchElementException exception will be thrown. If, however, the provided element is not the first or last key in the map, the first access to the list index will require linear time, as in the worst case the entire key set must be scanned in iteration order to retrieve the positional index of the starting key. If you use just the methods of a type-specific BidirectionalIterator, however, all operations will be performed in constant time.

See Also:

• Hash
• HashCommon
• Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class it.unimi.dsi.fastutil.bytes.AbstractByte2ByteMap

AbstractByte2ByteMap.BasicEntry, AbstractByte2ByteMap.BasicEntrySet

Nested classes/interfaces inherited from interface it.unimi.dsi.fastutil.bytes.Byte2ByteMap

Byte2ByteMap.Entry, Byte2ByteMap.FastEntrySet

Nested classes/interfaces inherited from interface it.unimi.dsi.fastutil.bytes.Byte2ByteSortedMap

Byte2ByteSortedMap.FastSortedEntrySet

Nested classes/interfaces inherited from interface it.unimi.dsi.fastutil.Hash

Hash.Strategy<K>

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

Map.Entry<K,V>

Field Summary

Fields inherited from interface it.unimi.dsi.fastutil.Hash

DEFAULT_GROWTH_FACTOR, DEFAULT_INITIAL_SIZE, DEFAULT_LOAD_FACTOR, FAST_LOAD_FACTOR, FREE, OCCUPIED, PRIMES, REMOVED, VERY_FAST_LOAD_FACTOR

Constructor Summary

Constructors

Constructor	Description
Byte2ByteLinkedOpenHashMap()	Creates a new hash map with initial expected Hash.DEFAULT_INITIAL_SIZE entries and Hash.DEFAULT_LOAD_FACTOR as load factor.
Byte2ByteLinkedOpenHashMap(byte[] k, byte[] v)	Creates a new hash map with Hash.DEFAULT_LOAD_FACTOR as load factor using the elements of two parallel arrays.
Byte2ByteLinkedOpenHashMap(byte[] k, byte[] v, float f)	Creates a new hash map using the elements of two parallel arrays.
Byte2ByteLinkedOpenHashMap(int expected)	Creates a new hash map with Hash.DEFAULT_LOAD_FACTOR as load factor.
Byte2ByteLinkedOpenHashMap(int expected, float f)	Creates a new hash map.
Byte2ByteLinkedOpenHashMap(Byte2ByteMap m)	Creates a new hash map with Hash.DEFAULT_LOAD_FACTOR as load factor copying a given type-specific one.
Byte2ByteLinkedOpenHashMap(Byte2ByteMap m, float f)	Creates a new hash map copying a given type-specific one.
Byte2ByteLinkedOpenHashMap(Map<? extends Byte,? extends Byte> m)	Creates a new hash map with Hash.DEFAULT_LOAD_FACTOR as load factor copying a given one.
Byte2ByteLinkedOpenHashMap(Map<? extends Byte,? extends Byte> m, float f)	Creates a new hash map copying a given one.

Method Summary

Modifier and Type	Method	Description
byte	addTo(byte k, byte incr)	Adds an increment to value currently associated with a key.
Byte2ByteSortedMap.FastSortedEntrySet	byte2ByteEntrySet()	Returns a type-specific sorted-set view of the mappings contained in this map.
void	clear()	Removes all of the mappings from this map (optional operation).
Byte2ByteLinkedOpenHashMap	clone()	Returns a deep copy of this map.
ByteComparator	comparator()	Returns the comparator associated with this sorted set, or null if it uses its keys' natural ordering.
byte	compute(byte k, BiFunction<? super Byte,? super Byte,? extends Byte> remappingFunction)	Attempts to compute a mapping for the specified key and its current mapped value (or null if there is no current mapping).
byte	computeIfAbsent(byte key, Byte2ByteFunction mappingFunction)	If the specified key is not already associated with a value, attempts to compute its value using the given mapping function and enters it into this map, unless the key is not present in the given mapping function.
byte	computeIfAbsent(byte k, IntUnaryOperator mappingFunction)	If the specified key is not already associated with a value, attempts to compute its value using the given mapping function and enters it into this map.
byte	computeIfAbsentNullable(byte k, IntFunction<? extends Byte> mappingFunction)	If the specified key is not already associated with a value, attempts to compute its value using the given mapping function and enters it into this map unless it is null.
byte	computeIfPresent(byte k, BiFunction<? super Byte,? super Byte,? extends Byte> remappingFunction)	If the value for the specified key is present, attempts to compute a new mapping given the key and its current mapped value.
boolean	containsKey(byte k)	Returns true if this function contains a mapping for the specified key.
boolean	containsValue(byte v)	Returns true if this map maps one or more keys to the specified value.
void	ensureCapacity(int capacity)	Ensures that this map can hold a certain number of keys without rehashing.
byte	firstByteKey()	Returns the first key of this map in iteration order.
byte	get(byte k)	Returns the value to which the given key is mapped.
byte	getAndMoveToFirst(byte k)	Returns the value to which the given key is mapped; if the key is present, it is moved to the first position of the iteration order.
byte	getAndMoveToLast(byte k)	Returns the value to which the given key is mapped; if the key is present, it is moved to the last position of the iteration order.
byte	getOrDefault(byte k, byte defaultValue)	Returns the value to which the specified key is mapped, or the defaultValue if this map contains no mapping for the key.
int	hashCode()	Returns a hash code for this map.
Byte2ByteSortedMap	headMap(byte to)	Returns a view of the portion of this sorted map whose keys are strictly less than toKey.
boolean	isEmpty()
ByteSortedSet	keySet()	Returns a type-specific-set view of the keys of this map.
byte	lastByteKey()	Returns the last key of this map in iteration order.
byte	merge(byte k, byte v, BiFunction<? super Byte,? super Byte,? extends Byte> remappingFunction)	If the specified key is not already associated with a value, associates it with the given value.
byte	put(byte k, byte v)	Adds a pair to the map (optional operation).
void	putAll(Map<? extends Byte,? extends Byte> m)
byte	putAndMoveToFirst(byte k, byte v)	Adds a pair to the map; if the key is already present, it is moved to the first position of the iteration order.
byte	putAndMoveToLast(byte k, byte v)	Adds a pair to the map; if the key is already present, it is moved to the last position of the iteration order.
byte	putIfAbsent(byte k, byte v)	If the specified key is not already associated with a value, associates it with the given value and returns the default return value, else returns the current value.
byte	remove(byte k)	Removes the mapping with the given key (optional operation).
boolean	remove(byte k, byte v)	Removes the entry for the specified key only if it is currently mapped to the specified value.
byte	removeFirstByte()	Removes the mapping associated with the first key in iteration order.
byte	removeLastByte()	Removes the mapping associated with the last key in iteration order.
byte	replace(byte k, byte v)	Replaces the entry for the specified key only if it is currently mapped to some value.
boolean	replace(byte k, byte oldValue, byte v)	Replaces the entry for the specified key only if currently mapped to the specified value.
int	size()	Returns the number of key/value mappings in this map.
Byte2ByteSortedMap	subMap(byte from, byte to)	Returns a view of the portion of this sorted map whose keys range from fromKey, inclusive, to toKey, exclusive.
Byte2ByteSortedMap	tailMap(byte from)	Returns a view of the portion of this sorted map whose keys are greater than or equal to fromKey.
boolean	trim()	Rehashes the map, making the table as small as possible.
boolean	trim(int n)	Rehashes this map if the table is too large.
ByteCollection	values()	Returns a type-specific-set view of the values of this map.

Methods inherited from class it.unimi.dsi.fastutil.bytes.AbstractByte2ByteMap

equals, toString

Methods inherited from class it.unimi.dsi.fastutil.bytes.AbstractByte2ByteFunction

defaultReturnValue, defaultReturnValue

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface it.unimi.dsi.fastutil.bytes.Byte2ByteFunction

andThen, andThenByte, andThenChar, andThenDouble, andThenFloat, andThenInt, andThenLong, andThenObject, andThenReference, andThenShort, applyAsInt, compose, composeByte, composeChar, composeDouble, composeFloat, composeInt, composeLong, composeObject, composeReference, composeShort

Methods inherited from interface it.unimi.dsi.fastutil.bytes.Byte2ByteMap

compute, computeIfAbsent, computeIfAbsentPartial, computeIfPresent, containsKey, containsValue, defaultReturnValue, defaultReturnValue, forEach, get, getOrDefault, merge, mergeByte, mergeByte, put, putIfAbsent, remove, remove, replace, replace

Methods inherited from interface it.unimi.dsi.fastutil.bytes.Byte2ByteSortedMap

entrySet, firstKey, headMap, lastKey, subMap, tailMap

Methods inherited from interface it.unimi.dsi.fastutil.Function

apply

Methods inherited from interface java.util.function.IntUnaryOperator

andThen, compose

Methods inherited from interface java.util.Map

containsKey, equals, get, getOrDefault, put, remove, replaceAll

Methods inherited from interface java.util.SequencedMap

firstEntry, lastEntry, pollFirstEntry, pollLastEntry, sequencedEntrySet, sequencedKeySet, sequencedValues

Methods inherited from interface java.util.SortedMap

putFirst, putLast, reversed

Constructor Details

Byte2ByteLinkedOpenHashMap

public Byte2ByteLinkedOpenHashMap(int expected,
 float f)

Creates a new hash map.

The actual table size will be the least power of two greater than expected/f.

Parameters:

expected - the expected number of elements in the hash map.

f - the load factor.

Byte2ByteLinkedOpenHashMap

public Byte2ByteLinkedOpenHashMap(int expected)

Creates a new hash map with Hash.DEFAULT_LOAD_FACTOR as load factor.

Parameters:

expected - the expected number of elements in the hash map.

Byte2ByteLinkedOpenHashMap

public Byte2ByteLinkedOpenHashMap()

Creates a new hash map with initial expected Hash.DEFAULT_INITIAL_SIZE entries and Hash.DEFAULT_LOAD_FACTOR as load factor.

Byte2ByteLinkedOpenHashMap

public Byte2ByteLinkedOpenHashMap(Map<? extends Byte,? extends Byte> m,
 float f)

Creates a new hash map copying a given one.

Parameters:

m - a Map to be copied into the new hash map.

f - the load factor.

Byte2ByteLinkedOpenHashMap

public Byte2ByteLinkedOpenHashMap(Map<? extends Byte,? extends Byte> m)

Creates a new hash map with Hash.DEFAULT_LOAD_FACTOR as load factor copying a given one.

Parameters:

m - a Map to be copied into the new hash map.

Byte2ByteLinkedOpenHashMap

public Byte2ByteLinkedOpenHashMap(Byte2ByteMap m,
 float f)

Creates a new hash map copying a given type-specific one.

Parameters:

m - a type-specific map to be copied into the new hash map.

f - the load factor.

Byte2ByteLinkedOpenHashMap

public Byte2ByteLinkedOpenHashMap(Byte2ByteMap m)

Creates a new hash map with Hash.DEFAULT_LOAD_FACTOR as load factor copying a given type-specific one.

Parameters:

m - a type-specific map to be copied into the new hash map.

Byte2ByteLinkedOpenHashMap

public Byte2ByteLinkedOpenHashMap(byte[] k,
 byte[] v,
 float f)

Creates a new hash map using the elements of two parallel arrays.

Parameters:

k - the array of keys of the new hash map.

v - the array of corresponding values in the new hash map.

f - the load factor.

Throws:

IllegalArgumentException - if k and v have different lengths.

Byte2ByteLinkedOpenHashMap

public Byte2ByteLinkedOpenHashMap(byte[] k,
 byte[] v)

Creates a new hash map with Hash.DEFAULT_LOAD_FACTOR as load factor using the elements of two parallel arrays.

Parameters:

k - the array of keys of the new hash map.

v - the array of corresponding values in the new hash map.

Throws:

IllegalArgumentException - if k and v have different lengths.

Method Details

ensureCapacity

public void ensureCapacity(int capacity)

Ensures that this map can hold a certain number of keys without rehashing.

Parameters:

capacity - a number of keys; there will be no rehashing unless the map size exceeds this number.

putAll

public void putAll(Map<? extends Byte,? extends Byte> m)

Description copied from class: AbstractByte2ByteMap

Specified by:

putAll in interface Map<Byte,Byte>

Overrides:

putAll in class AbstractByte2ByteMap

put

public byte put(byte k,
 byte v)

Description copied from interface: Byte2ByteFunction

Adds a pair to the map (optional operation).

Specified by:

put in interface Byte2ByteFunction

Parameters:

k - the key.

v - the value.

Returns:

the old value, or the default return value if no value was present for the given key.

See Also:

• Function.put(Object,Object)

addTo

public byte addTo(byte k,
 byte incr)

Adds an increment to value currently associated with a key.

Note that this method respects the default return value semantics: when called with a key that does not currently appears in the map, the key will be associated with the default return value plus the given increment.

Parameters:

k - the key.

incr - the increment.

Returns:

the old value, or the default return value if no value was present for the given key.

remove

public byte remove(byte k)

Description copied from interface: Byte2ByteFunction

Removes the mapping with the given key (optional operation).

Specified by:

remove in interface Byte2ByteFunction

Parameters:

k - the key.

Returns:

the old value, or the default return value if no value was present for the given key.

See Also:

• Function.remove(Object)

removeFirstByte

public byte removeFirstByte()

Removes the mapping associated with the first key in iteration order.

Returns:

the value previously associated with the first key in iteration order.

Throws:

NoSuchElementException - is this map is empty.

removeLastByte

public byte removeLastByte()

Removes the mapping associated with the last key in iteration order.

Returns:

the value previously associated with the last key in iteration order.

Throws:

NoSuchElementException - is this map is empty.

getAndMoveToFirst

public byte getAndMoveToFirst(byte k)

Returns the value to which the given key is mapped; if the key is present, it is moved to the first position of the iteration order.

Parameters:

k - the key.

Returns:

the corresponding value, or the default return value if no value was present for the given key.

getAndMoveToLast

public byte getAndMoveToLast(byte k)

Returns the value to which the given key is mapped; if the key is present, it is moved to the last position of the iteration order.

Parameters:

k - the key.

Returns:

the corresponding value, or the default return value if no value was present for the given key.

putAndMoveToFirst

public byte putAndMoveToFirst(byte k,
 byte v)

Adds a pair to the map; if the key is already present, it is moved to the first position of the iteration order.

Parameters:

k - the key.

v - the value.

Returns:

the old value, or the default return value if no value was present for the given key.

putAndMoveToLast

public byte putAndMoveToLast(byte k,
 byte v)

Adds a pair to the map; if the key is already present, it is moved to the last position of the iteration order.

Parameters:

k - the key.

v - the value.

Returns:

the old value, or the default return value if no value was present for the given key.

get

public byte get(byte k)

Description copied from interface: Byte2ByteFunction

Returns the value to which the given key is mapped.

Specified by:

get in interface Byte2ByteFunction

Parameters:

k - the key.

Returns:

the corresponding value, or the default return value if no value was present for the given key.

See Also:

• Function.get(Object)

containsKey

public boolean containsKey(byte k)

Description copied from class: AbstractByte2ByteMap

Returns true if this function contains a mapping for the specified key.

Specified by:

containsKey in interface Byte2ByteFunction

Specified by:

containsKey in interface Byte2ByteMap

Overrides:

containsKey in class AbstractByte2ByteMap

Parameters:

k - the key.

Returns:

true if this function associates a value to key.

See Also:

• Map.containsKey(Object)

containsValue

public boolean containsValue(byte v)

Description copied from class: AbstractByte2ByteMap

Returns true if this map maps one or more keys to the specified value.

Specified by:

containsValue in interface Byte2ByteMap

Overrides:

containsValue in class AbstractByte2ByteMap

See Also:

• Map.containsValue(Object)

getOrDefault

public byte getOrDefault(byte k,
 byte defaultValue)

Returns the value to which the specified key is mapped, or the defaultValue if this map contains no mapping for the key.

Specified by:

getOrDefault in interface Byte2ByteFunction

Specified by:

getOrDefault in interface Byte2ByteMap

Parameters:

k - the key.

defaultValue - the default mapping of the key.

Returns:

the value to which the specified key is mapped, or the defaultValue if this map contains no mapping for the key.

See Also:

• Map.getOrDefault(Object, Object)

putIfAbsent

public byte putIfAbsent(byte k,
 byte v)

If the specified key is not already associated with a value, associates it with the given value and returns the default return value, else returns the current value.

Specified by:

putIfAbsent in interface Byte2ByteMap

Parameters:

k - key with which the specified value is to be associated.

v - value to be associated with the specified key.

Returns:

the previous value associated with the specified key, or the default return value if there was no mapping for the key.

See Also:

• Map.putIfAbsent(Object, Object)

remove

public boolean remove(byte k,
 byte v)

Removes the entry for the specified key only if it is currently mapped to the specified value.

Specified by:

remove in interface Byte2ByteMap

Parameters:

k - key with which the specified value is associated.

v - value expected to be associated with the specified key.

Returns:

true if the value was removed.

See Also:

• Map.remove(Object, Object)

replace

public boolean replace(byte k,
 byte oldValue,
 byte v)

Replaces the entry for the specified key only if currently mapped to the specified value.

Specified by:

replace in interface Byte2ByteMap

Parameters:

k - key with which the specified value is associated.

oldValue - value expected to be associated with the specified key.

v - value to be associated with the specified key.

Returns:

true if the value was replaced.

See Also:

• Map.replace(Object, Object, Object)

replace

public byte replace(byte k,
 byte v)

Replaces the entry for the specified key only if it is currently mapped to some value.

Specified by:

replace in interface Byte2ByteMap

Parameters:

k - key with which the specified value is associated.

v - value to be associated with the specified key.

Returns:

the previous value associated with the specified key, or the default return value if there was no mapping for the key.

See Also:

• Map.replace(Object, Object)

computeIfAbsent

public byte computeIfAbsent(byte k,
 IntUnaryOperator mappingFunction)

If the specified key is not already associated with a value, attempts to compute its value using the given mapping function and enters it into this map.

Note that contrarily to the default computeIfAbsent(), it is not possible to not add a value for a given key, since the mappingFunction cannot return null. If such a behavior is needed, please use the corresponding nullable version.

Specified by:

computeIfAbsent in interface Byte2ByteMap

Parameters:

k - key with which the specified value is to be associated.

mappingFunction - the function to compute a value.

Returns:

the current (existing or computed) value associated with the specified key.

See Also:

• Map.computeIfAbsent(Object, java.util.function.Function)

computeIfAbsent

public byte computeIfAbsent(byte key,
 Byte2ByteFunction mappingFunction)

If the specified key is not already associated with a value, attempts to compute its value using the given mapping function and enters it into this map, unless the key is not present in the given mapping function.

This version of computeIfAbsent() uses a type-specific version of fastutil's Function. Since Function has a containsKey() method, it is possible to avoid adding a key by having containsKey() return false for that key.

Specified by:

computeIfAbsent in interface Byte2ByteMap

Parameters:

key - key with which the specified value is to be associated.

mappingFunction - the function to compute a value.

Returns:

the current (existing or computed) value associated with the specified key.

See Also:

• Map.computeIfAbsent(Object, java.util.function.Function)

computeIfAbsentNullable

public byte computeIfAbsentNullable(byte k,
 IntFunction<? extends Byte> mappingFunction)

If the specified key is not already associated with a value, attempts to compute its value using the given mapping function and enters it into this map unless it is null.

Note that this version of computeIfAbsent() should be used only if you plan to return null in the mapping function.

Specified by:

computeIfAbsentNullable in interface Byte2ByteMap

Parameters:

k - key with which the specified value is to be associated.

mappingFunction - the function to compute a value.

Returns:

the current (existing or computed) value associated with the specified key, or the default return value if the computed value is null.

See Also:

• Map.computeIfAbsent(Object, java.util.function.Function)

computeIfPresent

public byte computeIfPresent(byte k,
 BiFunction<? super Byte,? super Byte,? extends Byte> remappingFunction)

If the value for the specified key is present, attempts to compute a new mapping given the key and its current mapped value.

Specified by:

computeIfPresent in interface Byte2ByteMap

Parameters:

k - key with which the specified value is to be associated.

remappingFunction - the function to compute a value.

Returns:

the new value associated with the specified key, or the default return value if none.

See Also:

• Map.computeIfPresent(Object, java.util.function.BiFunction)

compute

public byte compute(byte k,
 BiFunction<? super Byte,? super Byte,? extends Byte> remappingFunction)

Attempts to compute a mapping for the specified key and its current mapped value (or null if there is no current mapping).

If the function returns null, the mapping is removed (or remains absent if initially absent). If the function itself throws an (unchecked) exception, the exception is rethrown, and the current mapping is left unchanged.

Specified by:

compute in interface Byte2ByteMap

Parameters:

k - key with which the specified value is to be associated.

remappingFunction - the function to compute a value.

Returns:

the new value associated with the specified key, or the default return value if none.

See Also:

• Map.compute(Object, java.util.function.BiFunction)

merge

public byte merge(byte k,
 byte v,
 BiFunction<? super Byte,? super Byte,? extends Byte> remappingFunction)

If the specified key is not already associated with a value, associates it with the given value. Otherwise, replaces the associated value with the results of the given remapping function, or removes if the result is null.

Specified by:

merge in interface Byte2ByteMap

Parameters:

k - key with which the resulting value is to be associated.

v - the value to be merged with the existing value associated with the key or, if no existing value is associated with the key, to be associated with the key.

remappingFunction - the function to recompute a value if present.

Returns:

the new value associated with the specified key, or the default return value if no value is associated with the key.

See Also:

• Map.merge(Object, Object, java.util.function.BiFunction)

clear

public void clear()

Description copied from interface: Byte2ByteMap

Removes all of the mappings from this map (optional operation). The map will be empty after this call returns.

Specified by:

clear in interface Byte2ByteMap

Specified by:

clear in interface Function<Byte,Byte>

Specified by:

clear in interface Map<Byte,Byte>

See Also:

• Map.clear()

size

public int size()

Description copied from interface: Byte2ByteMap

Returns the number of key/value mappings in this map. If the map contains more than Integer.MAX_VALUE elements, returns Integer.MAX_VALUE.

Specified by:

size in interface Byte2ByteMap

Specified by:

size in interface Function<Byte,Byte>

Specified by:

size in interface Map<Byte,Byte>

Returns:

the number of key-value mappings in this map.

See Also:

• Size64

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Map<Byte,Byte>

Overrides:

isEmpty in class AbstractByte2ByteMap

firstByteKey

public byte firstByteKey()

Returns the first key of this map in iteration order.

Specified by:

firstByteKey in interface Byte2ByteSortedMap

Returns:

the first key in iteration order.

See Also:

• SortedMap.firstKey()

lastByteKey

public byte lastByteKey()

Returns the last key of this map in iteration order.

Specified by:

lastByteKey in interface Byte2ByteSortedMap

Returns:

the last key in iteration order.

See Also:

• SortedMap.lastKey()

tailMap

public Byte2ByteSortedMap tailMap(byte from)

Returns a view of the portion of this sorted map whose keys are greater than or equal to fromKey.

Specified by:

tailMap in interface Byte2ByteSortedMap

See Also:

• SortedMap.tailMap(Object)

Implementation Specification:

This implementation just throws an UnsupportedOperationException.

headMap

public Byte2ByteSortedMap headMap(byte to)

Returns a view of the portion of this sorted map whose keys are strictly less than toKey.

Specified by:

headMap in interface Byte2ByteSortedMap

See Also:

• SortedMap.headMap(Object)

Implementation Specification:

This implementation just throws an UnsupportedOperationException.

subMap

public Byte2ByteSortedMap subMap(byte from,
 byte to)

Returns a view of the portion of this sorted map whose keys range from fromKey, inclusive, to toKey, exclusive.

Specified by:

subMap in interface Byte2ByteSortedMap

See Also:

• SortedMap.subMap(Object,Object)

Implementation Specification:

This implementation just throws an UnsupportedOperationException.

comparator

public ByteComparator comparator()

Returns the comparator associated with this sorted set, or null if it uses its keys' natural ordering.

Specified by:

comparator in interface Byte2ByteSortedMap

Specified by:

comparator in interface SortedMap<Byte,Byte>

See Also:

• SortedMap.comparator()

Implementation Specification:

This implementation just returns null.

byte2ByteEntrySet

public Byte2ByteSortedMap.FastSortedEntrySet byte2ByteEntrySet()

Description copied from interface: Byte2ByteSortedMap

Returns a type-specific sorted-set view of the mappings contained in this map.

Specified by:

byte2ByteEntrySet in interface Byte2ByteMap

Specified by:

byte2ByteEntrySet in interface Byte2ByteSortedMap

Returns:

a type-specific sorted-set view of the mappings contained in this map.

See Also:

• Byte2ByteSortedMap.entrySet()

keySet

public ByteSortedSet keySet()

Description copied from class: AbstractByte2ByteSortedMap

Returns a type-specific-set view of the keys of this map.

The view is backed by the set returned by Map.entrySet(). Note that no attempt is made at caching the result of this method, as this would require adding some attributes that lightweight implementations would not need. Subclasses may easily override this policy by calling this method and caching the result, but implementors are encouraged to write more efficient ad-hoc implementations.

The view is backed by the sorted set returned by Map.entrySet(). Note that no attempt is made at caching the result of this method, as this would require adding some attributes that lightweight implementations would not need. Subclasses may easily override this policy by calling this method and caching the result, but implementors are encouraged to write more efficient ad-hoc implementations.

Specified by:

keySet in interface Byte2ByteMap

Specified by:

keySet in interface Byte2ByteSortedMap

Specified by:

keySet in interface Map<Byte,Byte>

Specified by:

keySet in interface SortedMap<Byte,Byte>

Overrides:

keySet in class AbstractByte2ByteSortedMap

Returns:

a sorted set view of the keys of this map; it may be safely cast to a type-specific interface.

See Also:

• Map.keySet()

values

public ByteCollection values()

Description copied from class: AbstractByte2ByteSortedMap

Returns a type-specific-set view of the values of this map.

The view is backed by the set returned by Map.entrySet(). Note that no attempt is made at caching the result of this method, as this would require adding some attributes that lightweight implementations would not need. Subclasses may easily override this policy by calling this method and caching the result, but implementors are encouraged to write more efficient ad-hoc implementations.

The view is backed by the sorted set returned by Map.entrySet(). Note that no attempt is made at caching the result of this method, as this would require adding some attributes that lightweight implementations would not need. Subclasses may easily override this policy by calling this method and caching the result, but implementors are encouraged to write more efficient ad-hoc implementations.

Specified by:

values in interface Byte2ByteMap

Specified by:

values in interface Byte2ByteSortedMap

Specified by:

values in interface Map<Byte,Byte>

Specified by:

values in interface SortedMap<Byte,Byte>

Overrides:

values in class AbstractByte2ByteSortedMap

Returns:

a type-specific collection view of the values contained in this map.

See Also:

• Map.values()

trim

public boolean trim()

Rehashes the map, making the table as small as possible.

This method rehashes the table to the smallest size satisfying the load factor. It can be used when the set will not be changed anymore, so to optimize access speed and size.

If the table size is already the minimum possible, this method does nothing.

Returns:

true if there was enough memory to trim the map.

See Also:

• trim(int)

trim

public boolean trim(int n)

Rehashes this map if the table is too large.

Let N be the smallest table size that can hold max(n,size()) entries, still satisfying the load factor. If the current table size is smaller than or equal to N, this method does nothing. Otherwise, it rehashes this map in a table of size N.

This method is useful when reusing maps. Clearing a map leaves the table size untouched. If you are reusing a map many times, you can call this method with a typical size to avoid keeping around a very large table just because of a few large transient maps.

Parameters:

n - the threshold for the trimming.

Returns:

true if there was enough memory to trim the map.

See Also:

• trim()

clone

public Byte2ByteLinkedOpenHashMap clone()

Returns a deep copy of this map.

This method performs a deep copy of this hash map; the data stored in the map, however, is not cloned. Note that this makes a difference only for object keys.

Returns:

a deep copy of this map.

hashCode

public int hashCode()

Returns a hash code for this map. This method overrides the generic method provided by the superclass. Since equals() is not overriden, it is important that the value returned by this method is the same value as the one returned by the overriden method.

Specified by:

hashCode in interface Map<Byte,Byte>

Overrides:

hashCode in class AbstractByte2ByteMap

Returns:

a hash code for this map.