org.grouplens.lenskit.data.dao

Class DelimitedTextRatingCursor

java.lang.Object

org.grouplens.lenskit.cursors.AbstractCursor<T>

org.grouplens.lenskit.cursors.AbstractPollingCursor<E>

org.grouplens.lenskit.data.event.AbstractEventCursor<Rating>

org.grouplens.lenskit.data.dao.DelimitedTextRatingCursor

All Implemented Interfaces:

Closeable, AutoCloseable, Iterable<Rating>, Cursor<Rating>

public class DelimitedTextRatingCursor
extends AbstractEventCursor<Rating>

Cursor that parses arbitrary delimited text.

Compatibility: Public

Field Summary

Fields

Modifier and Type	Field and Description
protected org.slf4j.Logger	logger

Constructor Summary

Constructors

Constructor and Description
DelimitedTextRatingCursor(BufferedReader s) Construct a rating cursor from a reader.
DelimitedTextRatingCursor(BufferedReader s, String name, String delimiter) Construct a rating cursor from a reader.

Method Summary

Methods

Modifier and Type	Method and Description
void	close() No-op implementation of the Cursor.close() method.
Rating	poll() Return the next element in this Cursor, or null if there are no more elements.

Methods inherited from class org.grouplens.lenskit.data.event.AbstractEventCursor

copy

Methods inherited from class org.grouplens.lenskit.cursors.AbstractPollingCursor

fastNext, hasNext, next

Methods inherited from class org.grouplens.lenskit.cursors.AbstractCursor

fast, getRowCount, iterator

Methods inherited from class java.lang.Object

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

Field Detail

logger

protected org.slf4j.Logger logger

Constructor Detail

DelimitedTextRatingCursor

public DelimitedTextRatingCursor(@WillCloseWhenClosed@Nonnull
                         BufferedReader s)

Construct a rating cursor from a reader.

Parameters:

s - The reader to read.

DelimitedTextRatingCursor

public DelimitedTextRatingCursor(@WillCloseWhenClosed@Nonnull
                         BufferedReader s,
                         @Nullable
                         String name,
                         @Nonnull
                         String delimiter)

Construct a rating cursor from a reader.

Parameters:

s - The reader to read.

name - The file name (for error messages).

delimiter - The delimiter.

Method Detail

close

public void close()

Description copied from class: AbstractCursor

No-op implementation of the Cursor.close() method.

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Cursor<Rating>

Overrides:

close in class AbstractCursor<Rating>

poll

public Rating poll()

Description copied from class: AbstractPollingCursor

Return the next element in this Cursor, or null if there are no more elements. This must be safe to call multiple times at the end of its collection. The same element object is allowed to be reused (fast iteration), so long as AbstractPollingCursor.copy(Object) copies objects.

Specified by:

poll in class AbstractPollingCursor<Rating>

Returns:

The next element, or null