it.unimi.dsi.fastutil.ints
Class Int2LongArrayMap

java.lang.Object
  extended by it.unimi.dsi.fastutil.ints.AbstractInt2LongFunction
      extended by it.unimi.dsi.fastutil.ints.AbstractInt2LongMap
          extended by it.unimi.dsi.fastutil.ints.Int2LongArrayMap
All Implemented Interfaces:
Function<java.lang.Integer,java.lang.Long>, Int2LongFunction, Int2LongMap, java.io.Serializable, java.lang.Cloneable, java.util.Map<java.lang.Integer,java.lang.Long>

public class Int2LongArrayMap
extends AbstractInt2LongMap
implements java.io.Serializable, java.lang.Cloneable

A simple, brute-force implementation of a map based on two parallel backing arrays.

The main purpose of this implementation is that of wrapping cleanly the brute-force approach to the storage of a very small number of pairs: just put them into two parallel arrays and scan linearly to find an item.

See Also:
Serialized Form

Nested Class Summary
 
Nested classes/interfaces inherited from class it.unimi.dsi.fastutil.ints.AbstractInt2LongMap
AbstractInt2LongMap.BasicEntry
 
Nested classes/interfaces inherited from interface it.unimi.dsi.fastutil.ints.Int2LongMap
Int2LongMap.Entry, Int2LongMap.FastEntrySet
 
Constructor Summary
Int2LongArrayMap()
          Creates a new empty array map.
Int2LongArrayMap(int capacity)
          Creates a new empty array map of given capacity.
Int2LongArrayMap(int[] key, long[] value)
          Creates a new empty array map with given key and value backing arrays.
Int2LongArrayMap(int[] key, long[] value, int size)
          Creates a new array map with given key and value backing arrays, using the given number of elements.
Int2LongArrayMap(Int2LongMap m)
          Creates a new empty array map copying the entries of a given map.
 
Method Summary
 void clear()
          Removes all associations from this function (optional operation).
 java.lang.Object clone()
          Returns a deep copy of this map.
 boolean containsKey(int k)
          Checks whether the given value is contained in AbstractInt2LongMap.keySet().
 boolean containsValue(long v)
          Checks whether the given value is contained in AbstractInt2LongMap.values().
 long get(int k)
          Returns the value to which the given key is mapped.
 Int2LongMap.FastEntrySet int2LongEntrySet()
          Returns a type-specific set view of the mappings contained in this map.
 boolean isEmpty()
           
 IntSet keySet()
          Returns a type-specific-set view of the keys of this map.
 long put(int k, long v)
          Adds a pair to the map.
 long remove(int k)
          Removes the mapping with the given key.
 int size()
          Returns the intended number of keys in this function, or -1 if no such number exists.
 LongCollection values()
          Returns a type-specific-set view of the values of this map.
 
Methods inherited from class it.unimi.dsi.fastutil.ints.AbstractInt2LongMap
containsValue, entrySet, equals, hashCode, putAll, toString
 
Methods inherited from class it.unimi.dsi.fastutil.ints.AbstractInt2LongFunction
containsKey, defaultReturnValue, defaultReturnValue, get, put, remove
 
Methods inherited from class java.lang.Object
getClass, notify, notifyAll, wait, wait, wait
 
Methods inherited from interface it.unimi.dsi.fastutil.ints.Int2LongFunction
defaultReturnValue, defaultReturnValue
 
Methods inherited from interface it.unimi.dsi.fastutil.Function
containsKey, get, put, remove
 
Methods inherited from interface java.util.Map
containsKey, get, put, remove
 

Constructor Detail

Int2LongArrayMap

public Int2LongArrayMap(int[] key,
                        long[] value)
Creates a new empty array map with given key and value backing arrays.

Parameters:
key - the key array.
value - the value array (it must have the same length as key).

Int2LongArrayMap

public Int2LongArrayMap()
Creates a new empty array map.


Int2LongArrayMap

public Int2LongArrayMap(int capacity)
Creates a new empty array map of given capacity.

Parameters:
capacity - the initial capacity.

Int2LongArrayMap

public Int2LongArrayMap(Int2LongMap m)
Creates a new empty array map copying the entries of a given map.

Parameters:
m - a map.

Int2LongArrayMap

public Int2LongArrayMap(int[] key,
                        long[] value,
                        int size)
Creates a new array map with given key and value backing arrays, using the given number of elements.

Parameters:
key - the key array.
value - the value array (it must have the same length as key).
size - the number of valid elements in key and value.
Method Detail

int2LongEntrySet

public Int2LongMap.FastEntrySet int2LongEntrySet()
Description copied from interface: Int2LongMap
Returns a type-specific set view of the mappings contained in this map.

This method is necessary because there is no inheritance along type parameters: it is thus impossible to strengthen Int2LongMap.entrySet() so that it returns an ObjectSet of objects of type Int2LongMap.Entry (the latter makes it possible to access keys and values with type-specific methods).

Specified by:
int2LongEntrySet in interface Int2LongMap
Returns:
a type-specific set view of the mappings contained in this map.
See Also:
Int2LongMap.entrySet()

get

public long get(int k)
Description copied from interface: Int2LongFunction
Returns the value to which the given key is mapped.

Specified by:
get in interface Int2LongFunction
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)

size

public int size()
Description copied from interface: Function
Returns the intended number of keys in this function, or -1 if no such number exists.

Most function implementations will have some knowledge of the intended number of keys in their domain. In some cases, however, this might not be possible.

Specified by:
size in interface Function<java.lang.Integer,java.lang.Long>
Specified by:
size in interface java.util.Map<java.lang.Integer,java.lang.Long>
Returns:
the intended number of keys in this function, or -1 if that number is not available.

clear

public void clear()
Description copied from interface: Function
Removes all associations from this function (optional operation).

Specified by:
clear in interface Function<java.lang.Integer,java.lang.Long>
Specified by:
clear in interface java.util.Map<java.lang.Integer,java.lang.Long>
Overrides:
clear in class AbstractInt2LongFunction
See Also:
Map.clear()

containsKey

public boolean containsKey(int k)
Description copied from class: AbstractInt2LongMap
Checks whether the given value is contained in AbstractInt2LongMap.keySet().

Specified by:
containsKey in interface Int2LongFunction
Overrides:
containsKey in class AbstractInt2LongMap
See Also:
Function.containsKey(Object)

containsValue

public boolean containsValue(long v)
Description copied from class: AbstractInt2LongMap
Checks whether the given value is contained in AbstractInt2LongMap.values().

Specified by:
containsValue in interface Int2LongMap
Overrides:
containsValue in class AbstractInt2LongMap
See Also:
Map.containsValue(Object)

isEmpty

public boolean isEmpty()
Specified by:
isEmpty in interface java.util.Map<java.lang.Integer,java.lang.Long>
Overrides:
isEmpty in class AbstractInt2LongMap

put

public long put(int k,
                long v)
Description copied from interface: Int2LongFunction
Adds a pair to the map.

Specified by:
put in interface Int2LongFunction
Overrides:
put in class AbstractInt2LongFunction
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)

remove

public long remove(int k)
Description copied from interface: Int2LongFunction
Removes the mapping with the given key.

Specified by:
remove in interface Int2LongFunction
Overrides:
remove in class AbstractInt2LongFunction
Returns:
the old value, or the default return value if no value was present for the given key.
See Also:
Function.remove(Object)

keySet

public IntSet keySet()
Description copied from class: AbstractInt2LongMap
Returns a type-specific-set view of the keys of this map.

The view is backed by the set returned by AbstractInt2LongMap.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 Int2LongMap
Specified by:
keySet in interface java.util.Map<java.lang.Integer,java.lang.Long>
Overrides:
keySet in class AbstractInt2LongMap
Returns:
a set view of the keys of this map; it may be safely cast to a type-specific interface.
See Also:
Map.keySet()

values

public LongCollection values()
Description copied from class: AbstractInt2LongMap
Returns a type-specific-set view of the values of this map.

The view is backed by the set returned by AbstractInt2LongMap.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 Int2LongMap
Specified by:
values in interface java.util.Map<java.lang.Integer,java.lang.Long>
Overrides:
values in class AbstractInt2LongMap
Returns:
a set view of the values of this map; it may be safely cast to a type-specific interface.
See Also:
Map.values()

clone

public java.lang.Object 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.

Overrides:
clone in class java.lang.Object
Returns:
a deep copy of this map.