Package it.unimi.di.big.mg4j.document

Class FileSetDocumentCollection

java.lang.Object

it.unimi.di.big.mg4j.document.AbstractDocumentSequence

it.unimi.di.big.mg4j.document.AbstractDocumentCollection

it.unimi.di.big.mg4j.document.FileSetDocumentCollection

All Implemented Interfaces:

DocumentCollection, DocumentSequence, SafelyCloseable, FlyweightPrototype<DocumentCollection>, Closeable, Serializable, AutoCloseable

public class FileSetDocumentCollection
extends AbstractDocumentCollection
implements Serializable

A DocumentCollection corresponding to a given set of files.

This class provides a main method with a flexible syntax that serialises into a document collection a list of files given on the command line or piped into standard input. Optionally, you can provide a parallel list of URIs that will be associated with each file.

Warning: the number of file is limited by Integer.MAX_VALUE.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class it.unimi.di.big.mg4j.document.AbstractDocumentCollection

AbstractDocumentCollection.PropertyKeys

Field Summary

Fields inherited from interface it.unimi.di.big.mg4j.document.DocumentCollection

DEFAULT_EXTENSION

Constructor Summary

Constructors

Constructor	Description
FileSetDocumentCollection(String[] file, DocumentFactory factory)	Builds a document collection corresponding to a given set of files specified as an array.
FileSetDocumentCollection(String[] file, String[] uri, DocumentFactory factory)	Builds a document collection corresponding to a given set of files specified as an array and a parallel array of URIs, one for each file.

Method Summary

Modifier and Type	Method	Description
void	close()	Closes this document sequence, releasing all resources.
FileSetDocumentCollection	copy()
Document	document(long index)	Returns the document given its index.
DocumentFactory	factory()	Returns the factory used by this sequence.
static void	main(String[] arg)
Reference2ObjectMap<Enum<?>,Object>	metadata(long index)	Returns the metadata map for a document.
long	size()	Returns the number of documents in this collection.
InputStream	stream(long index)	Returns an input stream for the raw content of a document.

Methods inherited from class it.unimi.di.big.mg4j.document.AbstractDocumentCollection

ensureDocumentIndex, iterator, printAllDocuments, toString

Methods inherited from class it.unimi.di.big.mg4j.document.AbstractDocumentSequence

filename, finalize, load

Methods inherited from class java.lang.Object

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

Methods inherited from interface it.unimi.di.big.mg4j.document.DocumentSequence

filename

Constructor Detail

FileSetDocumentCollection

public FileSetDocumentCollection(String[] file,
                                 DocumentFactory factory)

Builds a document collection corresponding to a given set of files specified as an array.

Beware. This class is not guaranteed to work if files are deleted or modified after creation!

Parameters:

file - an array containing the files that will be contained in the collection.

factory - the factory that will be used to create documents.

FileSetDocumentCollection

public FileSetDocumentCollection(String[] file,
                                 String[] uri,
                                 DocumentFactory factory)

Builds a document collection corresponding to a given set of files specified as an array and a parallel array of URIs, one for each file.

Beware. This class is not guaranteed to work if files are deleted or modified after creation!

Parameters:

file - an array containing the files that will be contained in the collection.

uri - an array, parallel to file, containing URIs to be associated with each element of file.

factory - the factory that will be used to create documents.

Method Detail

factory

public DocumentFactory factory()

Description copied from interface: DocumentSequence

Returns the factory used by this sequence.

Every document sequence is based on a document factory that transforms raw bytes into a sequence of characters. The factory contains useful information such as the number of fields.

Specified by:

factory in interface DocumentSequence

Returns:

the factory used by this sequence.

size

public long size()

Description copied from interface: DocumentCollection

Returns the number of documents in this collection.

Specified by:

size in interface DocumentCollection

Returns:

the number of documents in this collection.

metadata

public Reference2ObjectMap<Enum<?>,Object> metadata(long index)

Description copied from interface: DocumentCollection

Returns the metadata map for a document.

Specified by:

metadata in interface DocumentCollection

Parameters:

index - an index between 0 (inclusive) and DocumentCollection.size() (exclusive).

Returns:

the metadata map for the document.

document

public Document document(long index)
                  throws IOException

Description copied from interface: DocumentCollection

Returns the document given its index.

Specified by:

document in interface DocumentCollection

Parameters:

index - an index between 0 (inclusive) and DocumentCollection.size() (exclusive).

Returns:

the index-th document.

Throws:

IOException

stream

public InputStream stream(long index)
                   throws IOException

Description copied from interface: DocumentCollection

Returns an input stream for the raw content of a document.

Specified by:

stream in interface DocumentCollection

Parameters:

index - an index between 0 (inclusive) and DocumentCollection.size() (exclusive).

Returns:

the raw content of the document as an input stream.

Throws:

IOException

copy

public FileSetDocumentCollection copy()

Specified by:

copy in interface DocumentCollection

Specified by:

copy in interface FlyweightPrototype<DocumentCollection>

close

public void close()
           throws IOException

Description copied from interface: DocumentSequence

Closes this document sequence, releasing all resources.

You should always call this method after having finished with this document sequence. Implementations are invited to call this method in a finaliser as a safety net (even better, implement SafelyCloseable), but since there is no guarantee as to when finalisers are invoked, you should not depend on this behaviour.

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Specified by:

close in interface DocumentSequence

Overrides:

close in class AbstractDocumentSequence

Throws:

IOException

main

public static void main(String[] arg)
                 throws IOException,
                        com.martiansoftware.jsap.JSAPException,
                        InstantiationException,
                        IllegalAccessException,
                        InvocationTargetException,
                        NoSuchMethodException

Throws:

IOException

com.martiansoftware.jsap.JSAPException

InstantiationException

IllegalAccessException

InvocationTargetException

NoSuchMethodException