Package org.terrier.structures

Class CompressingMetaIndex

java.lang.Object

org.terrier.structures.BaseCompressingMetaIndex

org.terrier.structures.CompressingMetaIndex

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable, MetaIndex

Direct Known Subclasses:

UncompressedMetaIndex

public class CompressingMetaIndex
extends BaseCompressingMetaIndex

Implementation of BaseCompressingMetaIndex that uses Zlib deflate algorithm to compress entries

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	CompressingMetaIndex.InputStream

Field Summary

Fields

Modifier and Type	Field	Description
protected static java.lang.ThreadLocal<java.util.zip.Inflater>	inflaterCache	thread-local cache of Inflaters to be re-used for decompression

Fields inherited from class org.terrier.structures.BaseCompressingMetaIndex

dataSource, key2bytelength, key2byteoffset, key2reverseOffset, keyCount, keyFactories, keyNames, numDocs, offsetLookup, path, pointerCache, prefix, recordLength, reverseMetaMaps, valueByteLengths, valueByteOffsets, valuesSorted

Constructor Summary

Constructors

Constructor	Description
CompressingMetaIndex(IndexOnDisk index, java.lang.String structureName)

Method Summary

Modifier and Type	Method	Description
protected byte[]	decode(byte[] input)

Methods inherited from class org.terrier.structures.BaseCompressingMetaIndex

_binarySearch, close, getAllItems, getDocument, getItem, getItems, getItems, getItems, getKeys, getReverseKeys, loadIndex, main, size

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

inflaterCache

protected static final java.lang.ThreadLocal<java.util.zip.Inflater> inflaterCache

thread-local cache of Inflaters to be re-used for decompression

Constructor Detail

CompressingMetaIndex

public CompressingMetaIndex(IndexOnDisk index,
                            java.lang.String structureName)
                     throws java.io.IOException

Throws:

java.io.IOException

Method Detail

decode

protected byte[] decode(byte[] input)
                 throws java.io.IOException

Specified by:

decode in class BaseCompressingMetaIndex

Throws:

java.io.IOException