org.terrier.indexing

Class CollectionFactory

java.lang.Object

org.terrier.indexing.CollectionFactory

public class CollectionFactory
extends Object

Implements a factory for Collection objects. Pass the name of the desired Collection(s) to loadCollection() or loadCollections(). loadCollection can take a comma separated list of collections, while loadCollections takes a String array of Collection names, in the same order. The package name org.terrier.indexing. is prepended to any Collections named without any explicit packages.

The bottom Collection is specified last, and this is loaded first. Ie Collections are loaded right to left. For instance: PassageCollection,TRECCollection would instantiate a PassageCollection which has as its only constructor parameter, a TREC Collection. Ie, the correponding code would be new PassageCollection(new TRECCollection()); If the optional constructor parameters types and values are specified, then these will be used to instantiate the innermost class.

Since:

1.1.0, 14/01/2007

Author:

Craig Macdonald craigm{a.}dcs.gla.ac.uk

Field Summary

Fields

Modifier and Type	Field and Description
protected static org.apache.log4j.Logger	logger logger for this class

Constructor Summary

Constructors

Constructor and Description
CollectionFactory()

Method Summary

Methods

Modifier and Type	Method and Description
static Collection	loadCollection(String CollectionName) Load collection(s) of the specified name.
static Collection	loadCollection(String CollectionName, Class<?>[] contructorTypes, Object[] constructorValues) Load collection(s) of the specified name.
static Collection	loadCollections() Use the default property trec.collection.class, or it's default value TRECCollection
static Collection	loadCollections(String[] collNames) Load collection(s) of the specified name.
static Collection	loadCollections(String[] collNames, Class<?>[] contructorTypes, Object[] constructorValues) Load collection(s) of the specified name.
protected static String	normaliseCollectionName(String collectionName) prepends org.terrier.indexing. to any Collections without a package

Methods inherited from class java.lang.Object

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

Field Detail

logger

protected static final org.apache.log4j.Logger logger

logger for this class

Constructor Detail

CollectionFactory

public CollectionFactory()

Method Detail

loadCollections

public static Collection loadCollections()

Use the default property trec.collection.class, or it's default value TRECCollection

loadCollection

public static Collection loadCollection(String CollectionName)

Load collection(s) of the specified name. Uses empty constructor of innermost Collection. Returns null on error

loadCollection

public static Collection loadCollection(String CollectionName,
                        Class<?>[] contructorTypes,
                        Object[] constructorValues)

Load collection(s) of the specified name. Types and values of the construcor as specified. Returns null on error

loadCollections

public static Collection loadCollections(String[] collNames,
                         Class<?>[] contructorTypes,
                         Object[] constructorValues)

Load collection(s) of the specified name. Types and values of the construcor as specified.

loadCollections

public static Collection loadCollections(String[] collNames)

Load collection(s) of the specified name. Uses default constructor of innermost Collection. Returns null on error

normaliseCollectionName

protected static String normaliseCollectionName(String collectionName)

prepends org.terrier.indexing. to any Collections without a package