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java.lang.Objectorg.apache.mahout.math.PersistentObject
org.apache.mahout.math.set.AbstractSet
org.apache.mahout.math.map.AbstractCharShortMap
org.apache.mahout.math.map.OpenCharShortHashMap
public class OpenCharShortHashMap
Open hash map from char keys to short values.
| Nested Class Summary | |
|---|---|
class |
OpenCharShortHashMap.MapElement
|
class |
OpenCharShortHashMap.MapIterator
|
| Field Summary | |
|---|---|
protected static byte |
FREE
|
protected int |
freeEntries
The number of table entries in state==FREE. |
protected static byte |
FULL
|
protected static char |
NO_KEY_VALUE
|
protected static byte |
REMOVED
|
protected byte[] |
state
The state of each hash table entry (FREE, FULL, REMOVED). |
protected char[] |
table
The hash table keys. |
protected short[] |
values
The hash table values. |
| Fields inherited from class org.apache.mahout.math.set.AbstractSet |
|---|
DEFAULT_CAPACITY, DEFAULT_MAX_LOAD_FACTOR, DEFAULT_MIN_LOAD_FACTOR, distinct, highWaterMark, lowWaterMark, maxLoadFactor, minLoadFactor |
| Constructor Summary | |
|---|---|
OpenCharShortHashMap()
Constructs an empty map with default capacity and default load factors. |
|
OpenCharShortHashMap(int initialCapacity)
Constructs an empty map with the specified initial capacity and default load factors. |
|
OpenCharShortHashMap(int initialCapacity,
double minLoadFactor,
double maxLoadFactor)
Constructs an empty map with the specified initial capacity and the specified minimum and maximum load factor. |
|
| Method Summary | |
|---|---|
short |
adjustOrPutValue(char key,
short newValue,
short incrValue)
Check the map for a key. |
void |
clear()
Removes all (key,value) associations from the receiver. |
Object |
clone()
Returns a deep copy of the receiver. |
boolean |
containsKey(char key)
Returns true if the receiver contains the specified key. |
boolean |
containsValue(short value)
Returns true if the receiver contains the specified value. |
void |
ensureCapacity(int minCapacity)
Ensures that the receiver can hold at least the specified number of associations without needing to allocate new internal memory. |
boolean |
forEachKey(CharProcedure procedure)
Applies a procedure to each key of the receiver, if any. |
boolean |
forEachPair(CharShortProcedure procedure)
Applies a procedure to each (key,value) pair of the receiver, if any. |
short |
get(char key)
Returns the value associated with the specified key. |
protected void |
getInternalFactors(int[] capacity,
double[] minLoadFactor,
double[] maxLoadFactor)
Access for unit tests. |
protected int |
indexOfInsertion(char key)
|
protected int |
indexOfKey(char key)
|
protected int |
indexOfValue(short value)
|
Iterator<OpenCharShortHashMap.MapElement> |
iterator()
|
void |
keys(CharArrayList list)
Fills all keys contained in the receiver into the specified list. |
void |
pairsMatching(CharShortProcedure condition,
CharArrayList keyList,
ShortArrayList valueList)
Fills all pairs satisfying a given condition into the specified lists. |
boolean |
put(char key,
short value)
Associates the given key with the given value. |
protected void |
rehash(int newCapacity)
Rehashes the contents of the receiver into a new table with a smaller or larger capacity. |
boolean |
removeKey(char key)
Removes the given key with its associated element from the receiver, if present. |
protected void |
setUp(int initialCapacity,
double minLoadFactor,
double maxLoadFactor)
Initializes the receiver. |
void |
trimToSize()
Trims the capacity of the receiver to be the receiver's current size. |
void |
values(ShortArrayList list)
Fills all values contained in the receiver into the specified list. |
| Methods inherited from class org.apache.mahout.math.map.AbstractCharShortMap |
|---|
copy, equals, hashCode, keys, keysSortedByValue, pairsSortedByKey, pairsSortedByValue, toString, toStringByValue, values |
| Methods inherited from class org.apache.mahout.math.set.AbstractSet |
|---|
chooseGrowCapacity, chooseHighWaterMark, chooseLowWaterMark, chooseMeanCapacity, chooseShrinkCapacity, equalsMindTheNull, isEmpty, nextPrime, size |
| Methods inherited from class java.lang.Object |
|---|
finalize, getClass, notify, notifyAll, wait, wait, wait |
| Field Detail |
|---|
protected static final byte FREE
protected static final byte FULL
protected static final byte REMOVED
protected static final char NO_KEY_VALUE
protected char[] table
protected short[] values
protected byte[] state
protected int freeEntries
| Constructor Detail |
|---|
public OpenCharShortHashMap()
public OpenCharShortHashMap(int initialCapacity)
initialCapacity - the initial capacity of the map.
IllegalArgumentException - if the initial capacity is less than zero.
public OpenCharShortHashMap(int initialCapacity,
double minLoadFactor,
double maxLoadFactor)
initialCapacity - the initial capacity.minLoadFactor - the minimum load factor.maxLoadFactor - the maximum load factor.
IllegalArgumentException - if initialCapacity < 0 || (minLoadFactor < 0.0 || minLoadFactor >= 1.0) ||
(maxLoadFactor <= 0.0 || maxLoadFactor >= 1.0) || (minLoadFactor >=
maxLoadFactor).| Method Detail |
|---|
public void clear()
clear in class AbstractSetpublic Object clone()
clone in class PersistentObjectpublic boolean containsKey(char key)
containsKey in class AbstractCharShortMappublic boolean containsValue(short value)
containsValue in class AbstractCharShortMappublic void ensureCapacity(int minCapacity)
This method never need be called; it is for performance tuning only. Calling this method before put()ing a large number of associations boosts performance, because the receiver will grow only once instead of potentially many times and hash collisions get less probable.
ensureCapacity in class AbstractSetminCapacity - the desired minimum capacity.public boolean forEachKey(CharProcedure procedure)
forEachKey in class AbstractCharShortMapprocedure - the procedure to be applied. Stops iteration if the procedure returns false, otherwise
continues.
public boolean forEachPair(CharShortProcedure procedure)
forEachKey(CharProcedure).
forEachPair in class AbstractCharShortMapprocedure - the procedure to be applied. Stops iteration if the procedure returns false, otherwise
continues.
public short get(char key)
get in class AbstractCharShortMapkey - the key to be searched for.
protected int indexOfInsertion(char key)
key - the key to be added to the receiver.
protected int indexOfKey(char key)
key - the key to be searched in the receiver.
protected int indexOfValue(short value)
value - the value to be searched in the receiver.
public void keys(CharArrayList list)
forEachKey(CharProcedure).
This method can be used to iterate over the keys of the receiver.
keys in class AbstractCharShortMaplist - the list to be filled, can have any size.public Iterator<OpenCharShortHashMap.MapElement> iterator()
public void pairsMatching(CharShortProcedure condition,
CharArrayList keyList,
ShortArrayList valueList)
forEachKey(CharProcedure). Example:
CharShortProcedure condition = new CharShortProcedure() { // match even values only
public boolean apply(char key, short value) { return value%2==0; }
}
keys = (8,7,6), values = (1,2,2) --> keyList = (6,8), valueList = (2,1)
pairsMatching in class AbstractCharShortMapcondition - the condition to be matched. Takes the current key as first and the current value as second
argument.keyList - the list to be filled with keys, can have any size.valueList - the list to be filled with values, can have any size.
public boolean put(char key,
short value)
put in class AbstractCharShortMapkey - the key the value shall be associated with.value - the value to be associated.
public short adjustOrPutValue(char key,
short newValue,
short incrValue)
AbstractCharShortMap
adjustOrPutValue in class AbstractCharShortMapkey - the key.newValue - the value to store if the key is not currently in the map.incrValue - the value to be added to the current value in the map.protected void rehash(int newCapacity)
public boolean removeKey(char key)
removeKey in class AbstractCharShortMapkey - the key to be removed from the receiver.
protected final void setUp(int initialCapacity,
double minLoadFactor,
double maxLoadFactor)
setUp in class AbstractSetinitialCapacity - the initial capacity of the receiver.minLoadFactor - the minLoadFactor of the receiver.maxLoadFactor - the maxLoadFactor of the receiver.
IllegalArgumentException - if initialCapacity < 0 || (minLoadFactor < 0.0 || minLoadFactor >= 1.0) ||
(maxLoadFactor <= 0.0 || maxLoadFactor >= 1.0) || (minLoadFactor >=
maxLoadFactor).public void trimToSize()
trimToSize in class AbstractSetpublic void values(ShortArrayList list)
forEachKey(CharProcedure).
This method can be used to iterate over the values of the receiver.
values in class AbstractCharShortMaplist - the list to be filled, can have any size.
protected void getInternalFactors(int[] capacity,
double[] minLoadFactor,
double[] maxLoadFactor)
capacity - minLoadFactor - maxLoadFactor -
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