Package elki.database.ids
Class EmptyDBIDs
- java.lang.Object
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- elki.database.ids.EmptyDBIDs
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- All Implemented Interfaces:
ArrayDBIDs
,ArrayStaticDBIDs
,DBIDs
,SetDBIDs
,StaticDBIDs
public class EmptyDBIDs extends java.lang.Object implements ArrayStaticDBIDs, SetDBIDs
Empty DBID collection.- Since:
- 0.4.0
- Author:
- Erich Schubert
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Nested Class Summary
Nested Classes Modifier and Type Class Description protected static class
EmptyDBIDs.EmptyDBIDIterator
Iterator for empty DBIDs-
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Field Summary
Fields Modifier and Type Field Description static EmptyDBIDs.EmptyDBIDIterator
EMPTY_ITERATOR
Empty DBID iterator.
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Constructor Summary
Constructors Modifier Constructor Description protected
EmptyDBIDs()
Constructor.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description DBIDVar
assignVar(int index, DBIDVar var)
Assign a DBID variable the value of positionindex
.int
binarySearch(DBIDRef key)
Search for the position of the given key, assuming that the data set is sorted.boolean
contains(DBIDRef o)
Test whether an ID is contained.void
forEach(java.util.function.Consumer<? super DBIDRef> action)
Execute a function for each ID.DBID
get(int i)
Get the i'th entry (starting at 0)boolean
isEmpty()
Test for an empty DBID collection.DBIDArrayMIter
iter()
Iterableint
size()
Size of the DBID "collection".ArrayDBIDs
slice(int begin, int end)
Slice a subarray (as view, not copy!)
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Field Detail
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EMPTY_ITERATOR
public static final EmptyDBIDs.EmptyDBIDIterator EMPTY_ITERATOR
Empty DBID iterator.
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Method Detail
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contains
public boolean contains(DBIDRef o)
Description copied from interface:DBIDs
Test whether an ID is contained.
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size
public int size()
Description copied from interface:ArrayDBIDs
Size of the DBID "collection".- Specified by:
size
in interfaceArrayDBIDs
- Specified by:
size
in interfaceDBIDs
- Returns:
- size
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isEmpty
public boolean isEmpty()
Description copied from interface:DBIDs
Test for an empty DBID collection.
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get
public DBID get(int i)
Description copied from interface:ArrayDBIDs
Get the i'th entry (starting at 0)If possible, use an
DBIDArrayIter
viaArrayDBIDs.iter()
instead, or anDBIDVar
viaArrayDBIDs.assignVar(int, elki.database.ids.DBIDVar)
- Specified by:
get
in interfaceArrayDBIDs
- Parameters:
i
- Index- Returns:
- DBID of i'th entry.
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assignVar
public DBIDVar assignVar(int index, DBIDVar var)
Description copied from interface:ArrayDBIDs
Assign a DBID variable the value of positionindex
.- Specified by:
assignVar
in interfaceArrayDBIDs
- Parameters:
index
- Positionvar
- Variable to assign the value to.
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iter
public DBIDArrayMIter iter()
Description copied from interface:ArrayDBIDs
Iterable- Specified by:
iter
in interfaceArrayDBIDs
- Specified by:
iter
in interfaceDBIDs
- Returns:
- Iterator
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binarySearch
public int binarySearch(DBIDRef key)
Description copied from interface:ArrayDBIDs
Search for the position of the given key, assuming that the data set is sorted. For unsorted arrays, the result is undefined.For keys not found,
-(1+insertion position)
is returned, as for JavaCollections.binarySearch(java.util.List<? extends java.lang.Comparable<? super T>>, T)
- Specified by:
binarySearch
in interfaceArrayDBIDs
- Parameters:
key
- Key to search for- Returns:
- Offset of key
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slice
public ArrayDBIDs slice(int begin, int end)
Description copied from interface:ArrayDBIDs
Slice a subarray (as view, not copy!)- Specified by:
slice
in interfaceArrayDBIDs
- Parameters:
begin
- Begin (inclusive)end
- End (exclusive)- Returns:
- Array slice.
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