An open addressed Map implementation for byte keys and long values.
Created: Sun Nov 4 08:52:45 2001
TByteLongHashMap
public TByteLongHashMap()
Creates a new TByteLongHashMap
instance with the default
capacity and load factor.
TByteLongHashMap
public TByteLongHashMap(TByteHashingStrategy strategy)
Creates a new TByteLongHashMap
instance with the default
capacity and load factor.
strategy
- used to compute hash codes and to compare keys.
TByteLongHashMap
public TByteLongHashMap(int initialCapacity)
Creates a new TByteLongHashMap
instance with a prime
capacity equal to or greater than initialCapacity and
with the default load factor.
initialCapacity
- an int
value
TByteLongHashMap
public TByteLongHashMap(int initialCapacity,
TByteHashingStrategy strategy)
Creates a new TByteLongHashMap
instance whose capacity
is the next highest prime above initialCapacity + 1
unless that value is already prime.
initialCapacity
- an int
valuestrategy
- used to compute hash codes and to compare keys.
TByteLongHashMap
public TByteLongHashMap(int initialCapacity,
float loadFactor)
Creates a new TByteLongHashMap
instance with a prime
capacity equal to or greater than initialCapacity and
with the specified load factor.
initialCapacity
- an int
valueloadFactor
- a float
value
TByteLongHashMap
public TByteLongHashMap(int initialCapacity,
float loadFactor,
TByteHashingStrategy strategy)
Creates a new TByteLongHashMap
instance with a prime
value at or near the specified capacity and load factor.
initialCapacity
- used to find a prime capacity for the table.loadFactor
- used to calculate the threshold over which
rehashing takes place.strategy
- used to compute hash codes and to compare keys.
adjustOrPutValue
public long adjustOrPutValue(byte key,
long adjust_amount,
long put_amount)
Adjusts the primitive value mapped to the key if the key is present in the map.
Otherwise, the initial_value is put in the map.
key
- the key of the value to incrementadjust_amount
- the amount to adjust the value byput_amount
- the value put into the map if the key is not initial present
- the value present in the map after the adjustment or put operation
adjustValue
public boolean adjustValue(byte key,
long amount)
Adjusts the primitive value mapped to key.
key
- the key of the value to incrementamount
- the amount to adjust the value by.
- true if a mapping was found and modified.
clear
public void clear()
Empties the map.
clone
public Object clone()
- a deep clone of this collection
containsKey
public boolean containsKey(byte key)
checks for the present of key in the keys of the map.
containsValue
public boolean containsValue(long val)
checks for the presence of val in the values of the map.
equals
public boolean equals(Object other)
Compares this map with another map for equality of their stored
entries.
forEachEntry
public boolean forEachEntry(TByteLongProcedure procedure)
Executes procedure for each key/value entry in the
map.
procedure
- a TOByteLongProcedure
value
- false if the loop over the entries terminated because
the procedure returned false for some entry.
forEachKey
public boolean forEachKey(TByteProcedure procedure)
Executes procedure for each key in the map.
procedure
- a TByteProcedure
value
- false if the loop over the keys terminated because
the procedure returned false for some key.
forEachValue
public boolean forEachValue(TLongProcedure procedure)
Executes procedure for each value in the map.
procedure
- a TLongProcedure
value
- false if the loop over the values terminated because
the procedure returned false for some value.
get
public long get(byte key)
retrieves the value for key
- the value of key or (byte)0 if no such mapping exists.
getValues
public long[] getValues()
Returns the values of the map.
hashCode
public int hashCode()
increment
public boolean increment(byte key)
Increments the primitive value mapped to key by 1
key
- the key of the value to increment
- true if a mapping was found and modified.
iterator
public TByteLongIterator iterator()
- a TByteLongIterator with access to this map's keys and values
keys
public byte[] keys()
returns the keys of the map.
keys
public byte[] keys(byte[] a)
returns the keys of the map.
a
- the array into which the elements of the list are to
be stored, if it is big enough; otherwise, a new array of the
same type is allocated for this purpose.
put
public long put(byte key,
long value)
Inserts a key/value pair into the map.
key
- an byte
valuevalue
- an long
value
- the previous value associated with key,
or (byte)0 if none was found.
readExternal
public void readExternal(ObjectInput in)
throws IOException,
ClassNotFoundException
rehash
protected void rehash(int newCapacity)
rehashes the map to the new capacity.
newCapacity
- an int
value
remove
public long remove(byte key)
Deletes a key/value pair from the map.
- an
long
value, or (byte)0 if no mapping for key exists
removeAt
protected void removeAt(int index)
removes the mapping at index from the map.
retainEntries
public boolean retainEntries(TByteLongProcedure procedure)
Retains only those entries in the map for which the procedure
returns a true value.
procedure
- determines which entries to keep
- true if the map was modified.
setUp
protected int setUp(int initialCapacity)
initializes the hashtable to a prime capacity which is at least
initialCapacity + 1.
initialCapacity
- an int
value
- the actual capacity chosen
transformValues
public void transformValues(TLongFunction function)
Transform the values in this map using function.
function
- a TLongFunction
value
writeExternal
public void writeExternal(ObjectOutput out)
throws IOException