Package org.plumelib.util
Class LimitedSizeIntSet
java.lang.Object
org.plumelib.util.LimitedSizeIntSet
- All Implemented Interfaces:
Serializable
,Cloneable
LimitedSizeIntSet stores up to some maximum number of unique values. If more than that many
elements are added, then functionality is degraded: most operations return a conservative
estimate (because the internal representation is nulled, in order to save space).
The advantage of this class over LimitedSizeSet<Integer>
is that it does not autobox
the int values, so it takes less memory.
- See Also:
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Field Summary
Modifier and TypeFieldDescriptionprotected int @Nullable @MinLen(1) []
If null, then at least numValues distinct values have been seen. -
Constructor Summary
ConstructorDescriptionLimitedSizeIntSet
(@org.checkerframework.checker.index.qual.Positive int maxValues) Create a new LimitedSizeIntSet that can hold maxValues values. -
Method Summary
Modifier and TypeMethodDescriptionvoid
add
(int elt) Add an element to this set.void
Add all elements ofs
to this set.clone()
boolean
contains
(int elt) Returns true if this set contains the given element.@org.checkerframework.checker.index.qual.Positive int
maxSize()
An upper bound on how many distinct elements can be individually represented in the set.static LimitedSizeIntSet
merge
(@org.checkerframework.checker.index.qual.Positive int maxValues, List<LimitedSizeIntSet> slist) Merges a list ofLimitedSizeIntSet
objects into a single object that represents the values seen by the entire list.boolean
Returns true if more elements have been added than this set can contain (which is the integer that was passed to the constructor when creating this set).int
size()
A lower bound on the number of elements in the set.toString()
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Field Details
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values
protected int @Nullable @MinLen(1) [] valuesIf null, then at least numValues distinct values have been seen. The size is not separately stored, because that would take extra space.
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Constructor Details
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LimitedSizeIntSet
public LimitedSizeIntSet(@org.checkerframework.checker.index.qual.Positive int maxValues) Create a new LimitedSizeIntSet that can hold maxValues values.- Parameters:
maxValues
- the maximum number of values this set will be able to hold; must be positive
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Method Details
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add
public void add(int elt) Add an element to this set.- Parameters:
elt
- the element to add to this set
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addAll
Add all elements ofs
to this set.- Parameters:
s
- the elements to add to this set
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contains
@Pure public boolean contains(int elt) Returns true if this set contains the given element.- Parameters:
elt
- the element whose membership to test- Returns:
- true if this set contains
elt
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size
@Pure public int size(@GuardSatisfied LimitedSizeIntSet this) A lower bound on the number of elements in the set. Returns either the number of elements that have been inserted in the set, or maxSize(), whichever is less.- Returns:
- a number that is a lower bound on the number of elements added to the set
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maxSize
public @org.checkerframework.checker.index.qual.Positive int maxSize()An upper bound on how many distinct elements can be individually represented in the set. Returns maxValues+1 (where maxValues is the argument to the constructor).- Returns:
- maximum capacity of the set representation
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repNulled
@EnsuresNonNullIf(result=false, expression="values") @Pure public boolean repNulled(@GuardSatisfied LimitedSizeIntSet this) Returns true if more elements have been added than this set can contain (which is the integer that was passed to the constructor when creating this set).- Returns:
- true if this set has been filled to capacity and its internal representation is nulled
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clone
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merge
public static LimitedSizeIntSet merge(@org.checkerframework.checker.index.qual.Positive int maxValues, List<LimitedSizeIntSet> slist) Merges a list ofLimitedSizeIntSet
objects into a single object that represents the values seen by the entire list. Returns the new object, whose maxValues is the given integer.- Parameters:
maxValues
- the maximum size for the returned LimitedSizeIntSetslist
- a list of LimitedSizeIntSet, whose elements will be merged- Returns:
- a LimitedSizeIntSet that merges the elements of slist
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toString
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