Package org.apache.jackrabbit.oak.segment.file

Class JournalReader

java.lang.Object

org.apache.jackrabbit.oak.commons.collections.AbstractIterator<JournalEntry>

org.apache.jackrabbit.oak.segment.file.JournalReader

All Implemented Interfaces:

Closeable, AutoCloseable, Iterator<JournalEntry>

public final class JournalReader
extends AbstractIterator<JournalEntry>
implements Closeable

Iterator over the revisions in the journal in reverse order (end of the file to beginning).

Constructor Summary

Constructors

Constructor	Description
JournalReader(JournalFile journal)

Method Summary

Modifier and Type	Method	Description
void	close()
protected JournalEntry	computeNext()	Computes the next element in the iteration.

Methods inherited from class org.apache.jackrabbit.oak.commons.collections.AbstractIterator

endOfData, hasNext, next

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Iterator

forEachRemaining, remove

Constructor Detail

JournalReader

public JournalReader(JournalFile journal)
              throws IOException

Throws:

IOException

Method Detail

computeNext

protected JournalEntry computeNext()

Description copied from class: AbstractIterator

Computes the next element in the iteration. Subclasses must implement this method and call AbstractIterator.endOfData() when no more elements are available.

Specified by:

computeNext in class AbstractIterator<JournalEntry>

Returns:

the next element, or AbstractIterator.endOfData() if iteration is over

Throws:

IllegalStateException - if an IOException occurs while reading from the journal file.

close

public void close()
           throws IOException

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Throws:

IOException