it.unimi.dsi.webgraph
Class SemiExternalOffsetList
java.lang.Object
java.util.AbstractCollection<Long>
it.unimi.dsi.fastutil.longs.AbstractLongCollection
it.unimi.dsi.fastutil.longs.AbstractLongBigList
it.unimi.dsi.webgraph.SemiExternalOffsetList
- All Implemented Interfaces:
- BigList<Long>, LongBigList, LongCollection, LongIterable, LongStack, Size64, Stack<Long>, Comparable<BigList<? extends Long>>, Iterable<Long>, Collection<Long>
public class SemiExternalOffsetList
- extends AbstractLongBigList
Provides semi-external random access to offsets of a BVGraph
.
This class is a semi-external LongList
that
is used to access graph streams when an EliasFanoMonotoneLongBigList
is not available.
This class accesses offsets in their
compressed forms, and provides entry points for random access to each offset. At construction
time, entry points are computed with a certain step, which is the number of offsets
accessible from each entry point, or, equivalently, the maximum number of offsets that will
be necessary to read to access a given offset.
Warning: This class is not thread safe, and needs to be synchronised to be used in a
multithreaded environment.
- Author:
- Fabien Campagne, Sebastiano Vigna
Methods inherited from class it.unimi.dsi.fastutil.longs.AbstractLongBigList |
add, add, add, addAll, addAll, addAll, addAll, addAll, addAll, addAll, addElements, addElements, compareTo, contains, ensureIndex, ensureRestrictedIndex, equals, get, getElements, getLong, hashCode, indexOf, indexOf, iterator, lastIndexOf, lastIndexOf, listIterator, listIterator, listIterator, peek, peekLong, pop, popLong, push, push, rem, remove, remove, removeElements, removeLong, removeLong, set, set, set, size, size, size, subList, top, topLong, toString |
Methods inherited from class it.unimi.dsi.fastutil.longs.AbstractLongCollection |
add, contains, containsAll, containsAll, isEmpty, longIterator, rem, remove, removeAll, removeAll, retainAll, retainAll, toArray, toArray, toArray, toLongArray, toLongArray |
Methods inherited from interface it.unimi.dsi.fastutil.Stack |
isEmpty |
SemiExternalOffsetList
public SemiExternalOffsetList(InputBitStream offsetRawData,
int offsetStep,
long numOffsets)
throws IOException
- Creates a new semi-external list.
- Parameters:
offsetRawData
- a bit stream containing the offsets in compressed form (γ-encoded deltas).offsetStep
- the step used to build random-access entry points.numOffsets
- the overall number of offsets (i.e., the number of terms).
- Throws:
IOException
getLong
public final long getLong(long index)
length
@Deprecated
public long length()
- Deprecated.
size64
public long size64()