org.egothor.duplicity.file

Class PermutatedMinsFileProducer

java.lang.Object

org.egothor.duplicity.file.PermutatedMinsFileProducer

public class PermutatedMinsFileProducer
extends Object

Represents the "minimums of permutated unit identificators" file used in duplicity checking algorithm, before if was written to the filesystem. Allows producing new instances of PermutatedMinsFile class. The file contains instances of UnitPermutatedMin class. That means it contains pairs {min(pi(T(d))), d}, where:

• d is identificator of unit on which we check duplicity (can be document, paragraph or sentence)
• T(d) is set of UIDs of all tokens in the unit d
• pi is a permutation

The class should be used as follows.

1. The class must be constructed by its constructor.
2. Barrels can be added by a call to add(org.egothor.core.DocumentData).
3. Committing barrels by a call to commit(java.lang.String) sorts and writes data to filesystem and returns instance of PermutatedMinsFile class.

Author:

Kateřina Dufková

Constructor Summary

Constructors

Constructor and Description
PermutatedMinsFileProducer(long permID) Initializes the object.

Method Summary

Modifier and Type	Method and Description
void	add(DocumentData doc) Adds document to the file.
PermutatedMinsFile	commit(String location) Commit the changes in the buffer to the main file.
List<UnitPermutatedMin>	getBuffer()
long	getPermID()
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

PermutatedMinsFileProducer

public PermutatedMinsFileProducer(long permID)

Initializes the object.

Parameters:

permID - permutation assigned to this file

Method Detail

getBuffer

public List<UnitPermutatedMin> getBuffer()

Returns:

getPermID

public long getPermID()

Returns:

add

public void add(DocumentData doc)

Adds document to the file. It takes the duplicityMins of the DocumentData object, and appends every field of the map that corresponds to our permutation to its content to the internal buffer. The appended fields are then released from the DocumentPermutatedMins field of DocumentData object.

Parameters:

doc - document to be added

commit

public PermutatedMinsFile commit(String location)

Commit the changes in the buffer to the main file.

toString

public String toString()

Overrides:

toString in class Object

Returns: