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java.lang.Objectorg.apache.mahout.math.PersistentObject
org.apache.mahout.math.set.AbstractSet
org.apache.mahout.math.set.AbstractCharSet
org.apache.mahout.math.set.OpenCharHashSet
public class OpenCharHashSet
Open hash set of char items;
| Field Summary | |
|---|---|
protected static byte |
FREE
|
protected static byte |
FULL
|
protected static char |
NO_KEY_VALUE
|
protected static byte |
REMOVED
|
| 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 | |
|---|---|
OpenCharHashSet()
Constructs an empty map with default capacity and default load factors. |
|
OpenCharHashSet(int initialCapacity)
Constructs an empty map with the specified initial capacity and default load factors. |
|
OpenCharHashSet(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 | |
|---|---|
boolean |
add(char key)
Associates the given key with the given value. |
void |
clear()
Removes all values associations from the receiver. |
Object |
clone()
Returns a deep copy of the receiver. |
boolean |
contains(char key)
Returns true if the receiver contains the specified key. |
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. |
protected void |
getInternalFactors(int[] capacity,
double[] minLoadFactor,
double[] maxLoadFactor)
Access for unit tests. |
protected int |
indexOfInsertion(char key)
|
protected int |
indexOfKey(char key)
|
void |
keys(CharArrayList list)
Fills all keys contained in the receiver into the specified list. |
protected void |
rehash(int newCapacity)
Rehashes the contents of the receiver into a new table with a smaller or larger capacity. |
boolean |
remove(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. |
| Methods inherited from class org.apache.mahout.math.set.AbstractCharSet |
|---|
copy, equals, hashCode, keys, toString |
| 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
| Constructor Detail |
|---|
public OpenCharHashSet()
public OpenCharHashSet(int initialCapacity)
initialCapacity - the initial capacity of the map.
IllegalArgumentException - if the initial capacity is less than zero.
public OpenCharHashSet(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 contains(char key)
contains in class AbstractCharSetpublic void ensureCapacity(int minCapacity)
This method never need be called; it is for performance tuning only. Calling this method before add()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 AbstractCharSetprocedure - the procedure to be applied. Stops iteration if the procedure returns false, otherwise
continues.
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.
public void keys(CharArrayList list)
forEachKey(CharProcedure).
This method can be used to iterate over the keys of the receiver.
keys in class AbstractCharSetlist - the list to be filled, can have any size.public boolean add(char key)
add in class AbstractCharSetkey - the key the value shall be associated with.
protected void rehash(int newCapacity)
public boolean remove(char key)
remove in class AbstractCharSetkey - 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 AbstractSet
protected void getInternalFactors(int[] capacity,
double[] minLoadFactor,
double[] maxLoadFactor)
capacity - minLoadFactor - maxLoadFactor -
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