org.terrier.structures.indexing

Class CompressionFactory

java.lang.Object

org.terrier.structures.indexing.CompressionFactory

public class CompressionFactory
extends Object

Configures the compression to be used when creating an IndexOnDisk. In particular, the property indexing.compression.configuration defines the name of a class of type CompressionConfiguration, which is used to configure define the classes to use for writing and reading of the compressed index structures. The default CompressionConfiguration is CompressionFactory.BitCompressionConfiguration. You can change the CompressionConfiguration for either the direct or inverted index by using the properties (other posting index structures are likewise supported):

• indexing.direct.compression.configuration - name of the CompressionFactory.CompressionConfiguration class to use for compressing the direct index
• indexing.inverted.compression.configuration - name of the CompressionFactory.CompressionConfiguration class to use for compressing the inverted index

Since:

4.0

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	CompressionFactory.BitCompressionConfiguration
static class	CompressionFactory.CompressionConfiguration A configuration object used by the disk indexers for configuring the compression for direct and inverted files.

Constructor Summary

Constructors

Constructor and Description
CompressionFactory()

Method Summary

Methods

Modifier and Type	Method and Description
static CompressionFactory.CompressionConfiguration	getCompressionConfiguration(String structureName, String[] fieldNames, boolean blocks)

Methods inherited from class java.lang.Object

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

Constructor Detail

CompressionFactory

public CompressionFactory()

Method Detail

getCompressionConfiguration

public static CompressionFactory.CompressionConfiguration getCompressionConfiguration(String structureName,
                                                                      String[] fieldNames,
                                                                      boolean blocks)