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/*
* Copyright (C) 2019, Google LLC and others
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0 which is available at
* https://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package org.eclipse.jgit.internal.storage.reftable;
import org.eclipse.jgit.lib.ReflogEntry;
import org.eclipse.jgit.lib.ReflogReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.locks.Lock;
/**
* Implement the ReflogReader interface for a reflog stored in reftable.
*/
public class ReftableReflogReader implements ReflogReader {
private final Lock lock;
private final Reftable reftable;
private final String refname;
ReftableReflogReader(Lock lock, Reftable merged, String refname) {
this.lock = lock;
this.reftable = merged;
this.refname = refname;
}
@Override
public ReflogEntry getLastEntry() throws IOException {
lock.lock();
try {
LogCursor cursor = reftable.seekLog(refname);
return cursor.next() ? cursor.getReflogEntry() : null;
} finally {
lock.unlock();
}
}
@Override
public List<ReflogEntry> getReverseEntries() throws IOException {
return getReverseEntries(Integer.MAX_VALUE);
}
@Override
public ReflogEntry getReverseEntry(int number) throws IOException {
lock.lock();
try {
LogCursor cursor = reftable.seekLog(refname);
while (true) {
if (!cursor.next() || number < 0) {
return null;
}
if (number == 0) {
return cursor.getReflogEntry();
}
number--;
}
} finally {
lock.unlock();
}
}
@Override
public List<ReflogEntry> getReverseEntries(int max) throws IOException {
lock.lock();
try {
LogCursor cursor = reftable.seekLog(refname);
List<ReflogEntry> result = new ArrayList<>();
while (cursor.next() && result.size() < max) {
result.add(cursor.getReflogEntry());
}
return result;
} finally {
lock.unlock();
}
}
}
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