Package org.agrona.collections
Class Object2NullableObjectHashMap<K,V>
- java.lang.Object
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- org.agrona.collections.Object2ObjectHashMap<K,V>
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- org.agrona.collections.Object2NullableObjectHashMap<K,V>
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- Type Parameters:
K
- the type of keys maintained by this map.V
- the type of mapped values.
- All Implemented Interfaces:
java.util.Map<K,V>
public class Object2NullableObjectHashMap<K,V> extends Object2ObjectHashMap<K,V>
Variation ofObject2ObjectHashMap
that allowsnull
values.
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Nested Class Summary
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Nested classes/interfaces inherited from class org.agrona.collections.Object2ObjectHashMap
Object2ObjectHashMap.AbstractIterator, Object2ObjectHashMap.EntryIterator, Object2ObjectHashMap.EntrySet, Object2ObjectHashMap.KeyIterator, Object2ObjectHashMap.KeySet, Object2ObjectHashMap.ValueCollection, Object2ObjectHashMap.ValueIterator
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Field Summary
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Fields inherited from class org.agrona.collections.Object2ObjectHashMap
MIN_CAPACITY
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Constructor Summary
Constructors Constructor Description Object2NullableObjectHashMap()
Default constructor.Object2NullableObjectHashMap(int initialCapacity, float loadFactor)
Defaults to avoiding allocation.Object2NullableObjectHashMap(int initialCapacity, float loadFactor, boolean shouldAvoidAllocation)
Create a new instance with specified parameters.Object2NullableObjectHashMap(Object2ObjectHashMap<K,V> mapToCopy)
Copy construct a new map from an existing one.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description protected java.lang.Object
mapNullValue(java.lang.Object value)
Handle incoming null value and optionally replace with another non-null counterpart.protected V
unmapNullValue(java.lang.Object value)
Handle incoming non-null value and optionally replace it with the null value counterpart.-
Methods inherited from class org.agrona.collections.Object2ObjectHashMap
capacity, clear, compact, compute, computeIfAbsent, computeIfPresent, containsKey, containsValue, entrySet, equals, forEach, get, hashCode, isEmpty, keySet, loadFactor, put, putAll, remove, resizeThreshold, size, toString, values
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Constructor Detail
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Object2NullableObjectHashMap
public Object2NullableObjectHashMap()
Default constructor.
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Object2NullableObjectHashMap
public Object2NullableObjectHashMap(int initialCapacity, float loadFactor)
Defaults to avoiding allocation.- Parameters:
initialCapacity
- for the map to overrideObject2ObjectHashMap.MIN_CAPACITY
loadFactor
- for the map to overrideHashing.DEFAULT_LOAD_FACTOR
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Object2NullableObjectHashMap
public Object2NullableObjectHashMap(int initialCapacity, float loadFactor, boolean shouldAvoidAllocation)
Create a new instance with specified parameters.- Parameters:
initialCapacity
- for the map to overrideObject2ObjectHashMap.MIN_CAPACITY
loadFactor
- for the map to overrideHashing.DEFAULT_LOAD_FACTOR
.shouldAvoidAllocation
- should allocation be avoided by caching iterators and map entries.
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Object2NullableObjectHashMap
public Object2NullableObjectHashMap(Object2ObjectHashMap<K,V> mapToCopy)
Copy construct a new map from an existing one.- Parameters:
mapToCopy
- for construction.
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Method Detail
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mapNullValue
protected java.lang.Object mapNullValue(java.lang.Object value)
Description copied from class:Object2ObjectHashMap
Handle incoming null value and optionally replace with another non-null counterpart.- Overrides:
mapNullValue
in classObject2ObjectHashMap<K,V>
- Parameters:
value
- value to be handled.- Returns:
- replacement value.
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unmapNullValue
protected V unmapNullValue(java.lang.Object value)
Description copied from class:Object2ObjectHashMap
Handle incoming non-null value and optionally replace it with the null value counterpart. This is the opposite of theObject2ObjectHashMap.mapNullValue(Object)
method.- Overrides:
unmapNullValue
in classObject2ObjectHashMap<K,V>
- Parameters:
value
- value to be handled.- Returns:
- replacement value.
- See Also:
Object2ObjectHashMap.mapNullValue(Object)
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