/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 2002-2006
* Sleepycat Software. All rights reserved.
*
* $Id: CheckpointFileReader.java,v 1.1 2006/05/06 08:59:56 ckaestne Exp $
*/
package com.sleepycat.je.log;
import java.io.IOException;
import java.nio.ByteBuffer;
import com.sleepycat.je.DatabaseException;
import com.sleepycat.je.dbi.EnvironmentImpl;
/**
* CheckpointFileReader searches for root and checkpoint entries.
*/
public class CheckpointFileReader extends FileReader {
/* Status about the last entry. */
private boolean isRoot;
private boolean isCheckpointEnd;
private boolean isCheckpointStart;
/**
* Create this reader to start at a given LSN.
*/
public CheckpointFileReader(EnvironmentImpl env,
int readBufferSize,
boolean forward,
long startLsn,
long finishLsn,
long endOfFileLsn)
throws IOException, DatabaseException {
super(env, readBufferSize, forward, startLsn,
null, endOfFileLsn, finishLsn);
}
/**
* @return true if this is a targetted entry.
*/
protected boolean isTargetEntry(byte logEntryTypeNumber,
byte logEntryTypeVersion) {
boolean isTarget = false;
isRoot = false;
isCheckpointEnd = false;
isCheckpointStart = false;
if (LogEntryType.LOG_CKPT_END.equalsType(logEntryTypeNumber,
logEntryTypeVersion)) {
isTarget = true;
isCheckpointEnd = true;
} else if (LogEntryType.LOG_CKPT_START.equalsType(logEntryTypeNumber,
logEntryTypeVersion)) {
isTarget = true;
isCheckpointStart = true;
} else if (LogEntryType.LOG_ROOT.equalsType(logEntryTypeNumber,
logEntryTypeVersion)) {
isTarget = true;
isRoot = true;
}
return isTarget;
}
/**
* This reader instantiate the first object of a given log entry
*/
protected boolean processEntry(ByteBuffer entryBuffer)
throws DatabaseException {
/* Don't need to read the entry, since we just use the LSN. */
return true;
}
/**
* @return true if last entry was a root entry.
*/
public boolean isRoot() {
return isRoot;
}
/**
* @return true if last entry was a checkpoint end entry.
*/
public boolean isCheckpointEnd() {
return isCheckpointEnd;
}
/**
* @return true if last entry was a checkpoint start entry.
*/
public boolean isCheckpointStart() {
return isCheckpointStart;
}
}