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java.lang.Objectorg.apache.mahout.math.PersistentObject
org.apache.mahout.math.set.AbstractSet
org.apache.mahout.math.map.AbstractCharFloatMap
org.apache.mahout.math.map.OpenCharFloatHashMap
public class OpenCharFloatHashMap
Open hash map from char keys to float values.
| Nested Class Summary | |
|---|---|
class |
OpenCharFloatHashMap.MapElement
|
class |
OpenCharFloatHashMap.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 float[] |
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 | |
|---|---|
OpenCharFloatHashMap()
Constructs an empty map with default capacity and default load factors. |
|
OpenCharFloatHashMap(int initialCapacity)
Constructs an empty map with the specified initial capacity and default load factors. |
|
OpenCharFloatHashMap(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 | |
|---|---|
float |
adjustOrPutValue(char key,
float newValue,
float 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(float 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(CharFloatProcedure procedure)
Applies a procedure to each (key,value) pair of the receiver, if any. |
float |
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(float value)
|
Iterator<OpenCharFloatHashMap.MapElement> |
iterator()
|
void |
keys(CharArrayList list)
Fills all keys contained in the receiver into the specified list. |
void |
pairsMatching(CharFloatProcedure condition,
CharArrayList keyList,
FloatArrayList valueList)
Fills all pairs satisfying a given condition into the specified lists. |
boolean |
put(char key,
float 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(FloatArrayList list)
Fills all values contained in the receiver into the specified list. |
| Methods inherited from class org.apache.mahout.math.map.AbstractCharFloatMap |
|---|
assign, assign, 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 float[] values
protected byte[] state
protected int freeEntries
| Constructor Detail |
|---|
public OpenCharFloatHashMap()
public OpenCharFloatHashMap(int initialCapacity)
initialCapacity - the initial capacity of the map.
IllegalArgumentException - if the initial capacity is less than zero.
public OpenCharFloatHashMap(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 AbstractCharFloatMappublic boolean containsValue(float value)
containsValue in class AbstractCharFloatMappublic 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 AbstractCharFloatMapprocedure - the procedure to be applied. Stops iteration if the procedure returns false, otherwise
continues.
public boolean forEachPair(CharFloatProcedure procedure)
forEachKey(CharProcedure).
forEachPair in class AbstractCharFloatMapprocedure - the procedure to be applied. Stops iteration if the procedure returns false, otherwise
continues.
public float get(char key)
get in class AbstractCharFloatMapkey - 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(float 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 AbstractCharFloatMaplist - the list to be filled, can have any size.public Iterator<OpenCharFloatHashMap.MapElement> iterator()
public void pairsMatching(CharFloatProcedure condition,
CharArrayList keyList,
FloatArrayList valueList)
forEachKey(CharProcedure). Example:
CharFloatProcedure condition = new CharFloatProcedure() { // match even values only
public boolean apply(char key, float value) { return value%2==0; }
}
keys = (8,7,6), values = (1,2,2) --> keyList = (6,8), valueList = (2,1)
pairsMatching in class AbstractCharFloatMapcondition - 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,
float value)
put in class AbstractCharFloatMapkey - the key the value shall be associated with.value - the value to be associated.
public float adjustOrPutValue(char key,
float newValue,
float incrValue)
AbstractCharFloatMap
adjustOrPutValue in class AbstractCharFloatMapkey - 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 AbstractCharFloatMapkey - 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(FloatArrayList list)
forEachKey(CharProcedure).
This method can be used to iterate over the values of the receiver.
values in class AbstractCharFloatMaplist - 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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