Packages 
Package Description
org.terrier  
org.terrier.applications
Provides application-level code that use the Terrier platform to perform indexing and retrieval from either standard test collections, interactive querying of a indexed collection.
org.terrier.compression.bit
Provides implementation of a random access and input and output streams where gamma, unary and binary, delta Golomb encoded integers can be read or written.
org.terrier.indexing
Provides classes and interfaces related to the indexing of documents.
org.terrier.indexing.tokenisation
Provides classes related to the tokenisation of documents.
org.terrier.matching
Provides the classes and interfaces used for matching documents to queries.
org.terrier.matching.daat
Provides classes that implement a document-at-a-time (DAAT) matching strategy.
org.terrier.matching.dsms
Provides the interface and the classes for modifying the scores of documents after an score has been assigned to documents, or implementing the combination of evidence.
org.terrier.matching.matchops
This package contains matching Operators.
org.terrier.matching.models
Provides the classes that implement various weighting models.
org.terrier.matching.models.aftereffect
Provides the interface and the classes for implementing the term frequency normalisation component in the DFR framework.
org.terrier.matching.models.basicmodel
Provides the interface and the classes for implementing the basic models for randomness in the DFR framework.
org.terrier.matching.models.dependence
Weighting models for term dependence models
org.terrier.matching.models.normalisation
Provides the interface and the classes for implementing the basic models for randomness in the DFR framework.
org.terrier.matching.models.queryexpansion
Provides the classes that implement various query expansion models.
org.terrier.matching.taat
Provides classes that implement a term-at-a-time (TAAT) matching strategy.
org.terrier.matching.tsms
Provides the interface and classes that implement the term score modifiers, which modify the scores assigned to documents for a particular term.
org.terrier.querying
Provides the interfaces and classes for the querying API of the Terrier platform, the controls, post processors and filters.
org.terrier.querying.parser
Provides the parser specification and the classes that implement the query language of the Terrier platform.
org.terrier.querying.summarisation
Package for summarisation algorithms.
org.terrier.sorting
Provides the classes that implement the sorting of various arrays for the Terrier platform.
org.terrier.statistics
Provides the implementations of various statistical routines.
org.terrier.structures
Provides the classes that implement the data structures used for retrieval with the Terrier platform.
org.terrier.structures.bit
Provides on-disk index structures that support the older bit-level compression scheme.
org.terrier.structures.collections
Provides data structures various data structures.
org.terrier.structures.postings
Provides classes representing single postings and atreams of postings in a posting list (e.g.
org.terrier.structures.postings.bit
Provides bit-level IterablePosting implementations.
org.terrier.structures.restructure
Contains legacy index data structure classes
org.terrier.structures.seralization
Provides classes for things that can be serializaed to disk.
org.terrier.terms
Provides the interface and classes for the term pipeline, a set of objects that process the terms during indexing and processing of queries.
org.terrier.utility
This package includes classes that are used in various part of the Terrier Platform.
org.terrier.utility.io
This package includes classes that are used for various IO duties within Terrier.
org.terrier.utility.restructure
Provides functionality to convert legacy Terrier indices into current indices.