Package it.unimi.dsi.fastutil.ints
Class Int2ObjectFunctions.EmptyFunction<V>
- java.lang.Object
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- it.unimi.dsi.fastutil.ints.AbstractInt2ObjectFunction<V>
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- it.unimi.dsi.fastutil.ints.Int2ObjectFunctions.EmptyFunction<V>
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- All Implemented Interfaces:
Function<Integer,V>
,Int2ObjectFunction<V>
,Serializable
,Cloneable
,Function<Integer,V>
,IntFunction<V>
- Direct Known Subclasses:
Int2ObjectMaps.EmptyMap
- Enclosing class:
- Int2ObjectFunctions
public static class Int2ObjectFunctions.EmptyFunction<V> extends AbstractInt2ObjectFunction<V> implements Serializable, Cloneable
An immutable class representing an empty type-specific function.This class may be useful to implement your own in case you subclass a type-specific function.
- See Also:
- Serialized Form
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
clear()
Removes all associations from this function (optional operation).Object
clone()
boolean
containsKey(int k)
Returns true if this function contains a mapping for the specified key.V
defaultReturnValue()
Gets the default return value.void
defaultReturnValue(V defRetValue)
Sets the default return value (optional operation).boolean
equals(Object o)
V
get(int k)
Returns the value to which the given key is mapped.int
hashCode()
int
size()
Returns the intended number of keys in this function, or -1 if no such number exists.String
toString()
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Methods inherited from interface it.unimi.dsi.fastutil.ints.Int2ObjectFunction
andThenByte, andThenChar, andThenDouble, andThenFloat, andThenInt, andThenLong, andThenObject, andThenReference, andThenShort, apply, composeByte, composeChar, composeDouble, composeFloat, composeInt, composeLong, composeObject, composeReference, composeShort, containsKey, get, put, put, remove, remove
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Method Detail
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get
public V get(int k)
Description copied from interface:Int2ObjectFunction
Returns the value to which the given key is mapped.- Specified by:
get
in interfaceInt2ObjectFunction<V>
- Parameters:
k
- the key.- Returns:
- the corresponding value, or the default return value if no value was present for the given key.
- See Also:
Function.get(Object)
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containsKey
public boolean containsKey(int k)
Description copied from interface:Int2ObjectFunction
Returns true if this function contains a mapping for the specified key.Note that for some kind of functions (e.g., hashes) this method will always return true. In particular, this default implementation always returns true.
- Specified by:
containsKey
in interfaceInt2ObjectFunction<V>
- Parameters:
k
- the key.- Returns:
- true if this function associates a value to
key
. - See Also:
Function.containsKey(Object)
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defaultReturnValue
public V defaultReturnValue()
Description copied from interface:Int2ObjectFunction
Gets the default return value.This default implementation just return the default null value of the type (
null
for objects, 0 for scalars, false for Booleans).- Specified by:
defaultReturnValue
in interfaceInt2ObjectFunction<V>
- Overrides:
defaultReturnValue
in classAbstractInt2ObjectFunction<V>
- Returns:
- the current default return value.
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defaultReturnValue
public void defaultReturnValue(V defRetValue)
Description copied from interface:Int2ObjectFunction
Sets the default return value (optional operation). This value must be returned by type-specific versions ofget()
,put()
andremove()
to denote that the map does not contain the specified key. It must be 0/false
/null
by default.- Specified by:
defaultReturnValue
in interfaceInt2ObjectFunction<V>
- Overrides:
defaultReturnValue
in classAbstractInt2ObjectFunction<V>
- Parameters:
defRetValue
- the new default return value.- See Also:
Int2ObjectFunction.defaultReturnValue()
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size
public int size()
Description copied from interface:Function
Returns the intended number of keys in this function, or -1 if no such number exists.Most function implementations will have some knowledge of the intended number of keys in their domain. In some cases, however, this might not be possible. This default implementation, in particular, returns -1.
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clear
public void clear()
Description copied from interface:Function
Removes all associations from this function (optional operation).- Specified by:
clear
in interfaceFunction<Integer,V>
- See Also:
Map.clear()
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clone
public Object clone()
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