Package com.esotericsoftware.kryo.util
Class IntMap<V>
- java.lang.Object
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- com.esotericsoftware.kryo.util.IntMap<V>
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public class IntMap<V> extends java.lang.Object
An unordered map that uses int keys. This implementation is a cuckoo hash map using 3 hashes, random walking, and a small stash for problematic keys. Null values are allowed. No allocation is done except when growing the table size.
This map performs very fast get, containsKey, and remove (typically O(1), worst case O(log(n))). Put may be a bit slower, depending on hash collisions. Load factors greater than 0.91 greatly increase the chances the map will have to rehash to the next higher POT size.
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Field Summary
Fields Modifier and Type Field Description int
size
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Constructor Summary
Constructors Constructor Description IntMap()
Creates a new map with an initial capacity of 32 and a load factor of 0.8.IntMap(int initialCapacity)
Creates a new map with a load factor of 0.8.IntMap(int initialCapacity, float loadFactor)
Creates a new map with the specified initial capacity and load factor.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
clear()
boolean
containsKey(int key)
boolean
containsValue(java.lang.Object value, boolean identity)
Returns true if the specified value is in the map.void
ensureCapacity(int additionalCapacity)
Increases the size of the backing array to acommodate the specified number of additional items.int
findKey(java.lang.Object value, boolean identity, int notFound)
Returns the key for the specified value, or notFound if it is not in the map.V
get(int key)
V
get(int key, V defaultValue)
V
put(int key, V value)
V
remove(int key)
java.lang.String
toString()
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Constructor Detail
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IntMap
public IntMap()
Creates a new map with an initial capacity of 32 and a load factor of 0.8. This map will hold 25 items before growing the backing table.
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IntMap
public IntMap(int initialCapacity)
Creates a new map with a load factor of 0.8. This map will hold initialCapacity * 0.8 items before growing the backing table.
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IntMap
public IntMap(int initialCapacity, float loadFactor)
Creates a new map with the specified initial capacity and load factor. This map will hold initialCapacity * loadFactor items before growing the backing table.
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Method Detail
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get
public V get(int key)
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remove
public V remove(int key)
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clear
public void clear()
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containsValue
public boolean containsValue(java.lang.Object value, boolean identity)
Returns true if the specified value is in the map. Note this traverses the entire map and compares every value, which may be an expensive operation.- Parameters:
identity
- If true, uses == to compare the specified value with values in the map. If false, usesObject.equals(Object)
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containsKey
public boolean containsKey(int key)
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findKey
public int findKey(java.lang.Object value, boolean identity, int notFound)
Returns the key for the specified value, or notFound if it is not in the map. Note this traverses the entire map and compares every value, which may be an expensive operation.- Parameters:
identity
- If true, uses == to compare the specified value with values in the map. If false, usesObject.equals(Object)
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ensureCapacity
public void ensureCapacity(int additionalCapacity)
Increases the size of the backing array to acommodate the specified number of additional items. Useful before adding many items to avoid multiple backing array resizes.
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toString
public java.lang.String toString()
- Overrides:
toString
in classjava.lang.Object
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