package com.sleepycat.je.log;
import java.io.IOException;
import java.nio.ByteBuffer;
import com.sleepycat.je.DatabaseException;
import com.sleepycat.je.dbi.EnvironmentImpl;
import com.sleepycat.je.log.entry.LogEntry;
import com.sleepycat.je.utilint.DbLsn;
import de.ovgu.cide.jakutil.*;
/**
* SearchFileReader searches for the a given entry type.
*/
public class SearchFileReader extends FileReader {
private LogEntryType targetType;
private LogEntry logEntry;
/**
* Create this reader to start at a given LSN.
*/
public SearchFileReader( EnvironmentImpl env, int readBufferSize, boolean forward, long startLsn, long endOfFileLsn, LogEntryType targetType) throws IOException, DatabaseException {
super(env,readBufferSize,forward,startLsn,null,endOfFileLsn,DbLsn.NULL_LSN);
this.targetType=targetType;
logEntry=targetType.getNewLogEntry();
}
/**
* @return true if this is a targetted entry.
*/
protected boolean isTargetEntry( byte logEntryTypeNumber, byte logEntryTypeVersion){
return (targetType.equalsType(logEntryTypeNumber,logEntryTypeVersion));
}
/**
* This reader instantiate the first object of a given log entry.
*/
protected boolean processEntry( ByteBuffer entryBuffer) throws DatabaseException {
logEntry.readEntry(entryBuffer,currentEntrySize,currentEntryTypeVersion,true);
return true;
}
/**
* @return the last object read.
*/
public Object getLastObject(){
return logEntry.getMainItem();
}
}