Package org.apache.nutch.collection

Class CollectionManager

java.lang.Object

org.apache.hadoop.conf.Configured

org.apache.nutch.collection.CollectionManager

All Implemented Interfaces:

Configurable

public class CollectionManager
extends Configured

Field Summary

Fields

Modifier and Type	Field	Description
static String	DEFAULT_FILE_NAME

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	CollectionManager()	Used for testing
	CollectionManager(Configuration conf)

Method Summary

Modifier and Type	Method	Description
Subcollection	createSubCollection(String id, String name)	Create a new subcollection.
void	deleteSubCollection(String id)	Delete named subcollection
Collection	getAll()	Returns all collections
static CollectionManager	getCollectionManager(Configuration conf)
Subcollection	getSubColection(String id)	Get the named subcollection
List<Subcollection>	getSubCollections(String url)	Return names of collections url is part of
protected void	init()
protected void	parse(InputStream input)
void	save()	Save collections into file

Methods inherited from class org.apache.hadoop.conf.Configured

getConf, setConf

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_FILE_NAME

public static final String DEFAULT_FILE_NAME

See Also:

Constant Field Values

Constructor Detail

CollectionManager

public CollectionManager(Configuration conf)

CollectionManager

protected CollectionManager()

Used for testing

Method Detail

init

protected void init()

parse

protected void parse(InputStream input)

getCollectionManager

public static CollectionManager getCollectionManager(Configuration conf)

getSubColection

public Subcollection getSubColection(String id)

Get the named subcollection

Parameters:

id - the id of a subcollection ot retrieve

Returns:

Named SubCollection (or null if not existing)

deleteSubCollection

public void deleteSubCollection(String id)
                         throws IOException

Delete named subcollection

Parameters:

id - Id of SubCollection to delete

Throws:

IOException - If there is an error retrieving and deleting the subcollection from the collection.

createSubCollection

public Subcollection createSubCollection(String id,
                                         String name)

Create a new subcollection.

Parameters:

id - Id of SubCollection to create

name - Name of SubCollection to create

Returns:

Created SubCollection or null if allready existed

getSubCollections

public List<Subcollection> getSubCollections(String url)

Return names of collections url is part of

Parameters:

url - The url to test against Collections

Returns:

A List of Subcollection's

getAll

public Collection getAll()

Returns all collections

Returns:

All collections CollectionManager knows about

save

public void save()
          throws IOException

Save collections into file

Throws:

IOException - If there is a fatal error flushing or closing the FileOutputStream associated with the save process.