it.unimi.dsi.fastutil.longs
Class LongArraySet

java.lang.Object
  extended by java.util.AbstractCollection<Long>
      extended by it.unimi.dsi.fastutil.longs.AbstractLongCollection
          extended by it.unimi.dsi.fastutil.longs.AbstractLongSet
              extended by it.unimi.dsi.fastutil.longs.LongArraySet
All Implemented Interfaces:
LongCollection, LongIterable, LongSet, Serializable, Cloneable, Iterable<Long>, Collection<Long>, Set<Long>

public class LongArraySet
extends AbstractLongSet
implements Serializable, Cloneable

A simple, brute-force implementation of a set based on a backing array.

The main purpose of this implementation is that of wrapping cleanly the brute-force approach to the storage of a very small number of items: just put them into an array and scan linearly to find an item.

See Also:
Serialized Form

Constructor Summary
LongArraySet()
          Creates a new empty array set.
LongArraySet(Collection<? extends Long> c)
          Creates a new array set copying the contents of a given set.
LongArraySet(int capacity)
          Creates a new empty array set of given initial capacity.
LongArraySet(long[] a)
          Creates a new array set using the given backing array.
LongArraySet(long[] a, int size)
          Creates a new array set using the given backing array and the given number of elements of the array.
LongArraySet(LongCollection c)
          Creates a new array set copying the contents of a given collection.
 
Method Summary
 boolean add(long k)
           
 void clear()
           
 LongArraySet clone()
          Returns a deep copy of this set.
 boolean contains(long k)
           
 boolean isEmpty()
           
 LongIterator iterator()
          Returns a type-specific iterator on the elements of this collection.
 boolean remove(long k)
          Removes an element from this set.
 int size()
           
 
Methods inherited from class it.unimi.dsi.fastutil.longs.AbstractLongSet
equals, hashCode, rem, remove
 
Methods inherited from class it.unimi.dsi.fastutil.longs.AbstractLongCollection
add, addAll, addAll, contains, containsAll, containsAll, longIterator, rem, removeAll, removeAll, retainAll, retainAll, toArray, toArray, toArray, toLongArray, toLongArray, toString
 
Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait
 
Methods inherited from interface it.unimi.dsi.fastutil.longs.LongCollection
addAll, containsAll, longIterator, removeAll, retainAll, toArray, toArray, toLongArray, toLongArray
 
Methods inherited from interface java.util.Set
add, addAll, contains, containsAll, removeAll, retainAll, toArray, toArray
 

Constructor Detail

LongArraySet

public LongArraySet(long[] a)
Creates a new array set using the given backing array. The resulting set will have as many elements as the array.

It is responsibility of the caller that the elements of a are distinct.

Parameters:
a - the backing array.

LongArraySet

public LongArraySet()
Creates a new empty array set.


LongArraySet

public LongArraySet(int capacity)
Creates a new empty array set of given initial capacity.

Parameters:
capacity - the initial capacity.

LongArraySet

public LongArraySet(LongCollection c)
Creates a new array set copying the contents of a given collection.

Parameters:
c - a collection.

LongArraySet

public LongArraySet(Collection<? extends Long> c)
Creates a new array set copying the contents of a given set.

Parameters:
c - a collection.

LongArraySet

public LongArraySet(long[] a,
                    int size)
Creates a new array set using the given backing array and the given number of elements of the array.

It is responsibility of the caller that the first size elements of a are distinct.

Parameters:
a - the backing array.
size - the number of valid elements in a.
Method Detail

iterator

public LongIterator iterator()
Description copied from interface: LongCollection
Returns a type-specific iterator on the elements of this collection.

Note that this specification strengthens the one given in Iterable.iterator(), which was already strengthened in the corresponding type-specific class, but was weakened by the fact that this interface extends Collection.

Specified by:
iterator in interface LongCollection
Specified by:
iterator in interface LongIterable
Specified by:
iterator in interface LongSet
Specified by:
iterator in interface Iterable<Long>
Specified by:
iterator in interface Collection<Long>
Specified by:
iterator in interface Set<Long>
Specified by:
iterator in class AbstractLongSet
Returns:
a type-specific iterator on the elements of this collection.

contains

public boolean contains(long k)
Specified by:
contains in interface LongCollection
Overrides:
contains in class AbstractLongCollection
See Also:
Collection.contains(Object)

size

public int size()
Specified by:
size in interface Collection<Long>
Specified by:
size in interface Set<Long>
Specified by:
size in class AbstractCollection<Long>

remove

public boolean remove(long k)
Description copied from interface: LongSet
Removes an element from this set.

Note that the corresponding method of the type-specific collection is rem(). This unfortunate situation is caused by the clash with the similarly named index-based method in the List interface.

Specified by:
remove in interface LongSet
Overrides:
remove in class AbstractLongSet
See Also:
Collection.remove(Object)

add

public boolean add(long k)
Specified by:
add in interface LongCollection
Overrides:
add in class AbstractLongCollection
See Also:
Collection.add(Object)

clear

public void clear()
Specified by:
clear in interface Collection<Long>
Specified by:
clear in interface Set<Long>
Overrides:
clear in class AbstractCollection<Long>

isEmpty

public boolean isEmpty()
Specified by:
isEmpty in interface Collection<Long>
Specified by:
isEmpty in interface Set<Long>
Overrides:
isEmpty in class AbstractLongCollection

clone

public LongArraySet clone()
Returns a deep copy of this set.

This method performs a deep copy of this hash set; the data stored in the set, however, is not cloned. Note that this makes a difference only for object keys.

Overrides:
clone in class Object
Returns:
a deep copy of this set.


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