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java.lang.Objectorg.apache.mahout.math.PersistentObject
org.apache.mahout.math.set.AbstractSet
org.apache.mahout.math.set.OpenHashSet<T>
public class OpenHashSet<T>
Open hashing alternative to java.util.HashSet.
| Field Summary | |
|---|---|
protected static byte |
FREE
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protected static byte |
FULL
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protected static char |
NO_KEY_VALUE
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protected static byte |
REMOVED
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| 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 | |
|---|---|
OpenHashSet()
Constructs an empty map with default capacity and default load factors. |
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OpenHashSet(int initialCapacity)
Constructs an empty map with the specified initial capacity and default load factors. |
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OpenHashSet(int initialCapacity,
double minLoadFactor,
double maxLoadFactor)
Constructs an empty map with the specified initial capacity and the specified minimum and maximum load factor. |
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| Method Summary | ||
|---|---|---|
boolean |
add(Object key)
|
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boolean |
addAll(Collection<? extends T> c)
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void |
clear()
Removes all values associations from the receiver. |
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Object |
clone()
Returns a deep copy of the receiver. |
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boolean |
contains(Object key)
Returns true if the receiver contains the specified key. |
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boolean |
containsAll(Collection<?> c)
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void |
ensureCapacity(int minCapacity)
Ensures that the receiver can hold at least the specified number of associations without needing to allocate new internal memory. |
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boolean |
equals(Object obj)
OpenHashSet instances are only equal to other OpenHashSet instances, not to any other collection. |
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boolean |
forEachKey(ObjectProcedure<T> procedure)
Applies a procedure to each key of the receiver, if any. |
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int |
hashCode()
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protected int |
indexOfInsertion(T key)
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protected int |
indexOfKey(T key)
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boolean |
isEmpty()
Returns true if the receiver contains no (key,value) associations. |
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Iterator<T> |
iterator()
Implement the standard Java Collections iterator. |
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List<T> |
keys()
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void |
keys(List<T> list)
Fills all keys contained in the receiver into the specified list. |
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protected void |
rehash(int newCapacity)
Rehashes the contents of the receiver into a new table with a smaller or larger capacity. |
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boolean |
remove(Object key)
Removes the given key with its associated element from the receiver, if present. |
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boolean |
removeAll(Collection<?> c)
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boolean |
retainAll(Collection<?> c)
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protected void |
setUp(int initialCapacity,
double minLoadFactor,
double maxLoadFactor)
Initializes the receiver. |
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Object[] |
toArray()
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|
toArray(T[] a)
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void |
trimToSize()
Trims the capacity of the receiver to be the receiver's current size. |
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| Methods inherited from class org.apache.mahout.math.set.AbstractSet |
|---|
chooseGrowCapacity, chooseHighWaterMark, chooseLowWaterMark, chooseMeanCapacity, chooseShrinkCapacity, equalsMindTheNull, nextPrime, size |
| Methods inherited from class java.lang.Object |
|---|
finalize, getClass, notify, notifyAll, toString, wait, wait, wait |
| Methods inherited from interface java.util.Set |
|---|
size |
| 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 OpenHashSet()
public OpenHashSet(int initialCapacity)
initialCapacity - the initial capacity of the map.
IllegalArgumentException - if the initial capacity is less than zero.
public OpenHashSet(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 interface Collection<T>clear in interface Set<T>clear in class AbstractSetpublic Object clone()
clone in class PersistentObjectpublic boolean contains(Object key)
contains in interface Collection<T>contains in interface Set<T>public 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(ObjectProcedure<T> procedure)
procedure - the procedure to be applied. Stops iteration if the procedure returns false, otherwise
continues.
protected int indexOfInsertion(T key)
key - the key to be added to the receiver.
protected int indexOfKey(T key)
key - the key to be searched in the receiver.
public void keys(List<T> list)
list - the list to be filled, can have any size.public boolean add(Object key)
add in interface Collection<T>add in interface Set<T>protected void rehash(int newCapacity)
public boolean remove(Object key)
remove in interface Collection<T>remove in interface Set<T>key - the key to be removed from the receiver.
protected 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 boolean isEmpty()
AbstractSet
isEmpty in interface Collection<T>isEmpty in interface Set<T>isEmpty in class AbstractSetpublic boolean equals(Object obj)
equals in interface Collection<T>equals in interface Set<T>equals in class Objectpublic int hashCode()
hashCode in interface Collection<T>hashCode in interface Set<T>hashCode in class Objectpublic Iterator<T> iterator()
iterator in interface Iterable<T>iterator in interface Collection<T>iterator in interface Set<T>public Object[] toArray()
toArray in interface Collection<T>toArray in interface Set<T>public boolean addAll(Collection<? extends T> c)
addAll in interface Collection<T>addAll in interface Set<T>public boolean containsAll(Collection<?> c)
containsAll in interface Collection<T>containsAll in interface Set<T>public boolean removeAll(Collection<?> c)
removeAll in interface Collection<T>removeAll in interface Set<T>public boolean retainAll(Collection<?> c)
retainAll in interface Collection<T>retainAll in interface Set<T>public <T> T[] toArray(T[] a)
toArray in interface Collection<T>toArray in interface Set<T>public List<T> keys()
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