MapLN.java

package com.sleepycat.je.tree;
import java.nio.ByteBuffer;
import com.sleepycat.je.DatabaseException;
import com.sleepycat.je.dbi.DatabaseImpl;
import com.sleepycat.je.log.LogEntryType;
import com.sleepycat.je.log.LogException;
import com.sleepycat.je.log.LogUtils;
import de.ovgu.cide.jakutil.*;
/** 
 * A MapLN represents a Leaf Node in the JE DatabaseImpl Naming Tree. 
 */
public final class MapLN extends LN {
  private static final String BEGIN_TAG="<mapLN>";
  private static final String END_TAG="</mapLN>";
  private DatabaseImpl databaseImpl;
  private boolean deleted;
  /** 
 * Create a new MapLn to hold a new databaseImpl. In the ideal world, we'd
 * have a base LN class so that this MapLN doesn't have a superfluous data
 * field, but we want to optimize the LN class for size and speed right
 * now.
 */
  public MapLN(  DatabaseImpl db){
    super(new byte[0]);
    databaseImpl=db;
    deleted=false;
  }
  /** 
 * Create an empty MapLN, to be filled in from the log.
 */
  public MapLN() throws DatabaseException {
    super();
    databaseImpl=new DatabaseImpl();
  }
  public boolean isDeleted(){
    return deleted;
  }
  void makeDeleted(){
    deleted=true;
    databaseImpl.getTree().setRoot(null,true);
  }
  public DatabaseImpl getDatabase(){
    return databaseImpl;
  }
  /** 
 * Initialize a node that has been faulted in from the log.
 */
  public void postFetchInit(  DatabaseImpl db,  long sourceLsn) throws DatabaseException {
    databaseImpl.setEnvironmentImpl(db.getDbEnvironment());
  }
  public String toString(){
    return dumpString(0,true);
  }
  public String beginTag(){
    return BEGIN_TAG;
  }
  public String endTag(){
    return END_TAG;
  }
  public String dumpString(  int nSpaces,  boolean dumpTags){
    StringBuffer sb=new StringBuffer();
    sb.append(super.dumpString(nSpaces,dumpTags));
    sb.append('\n');
    sb.append(TreeUtils.indent(nSpaces));
    sb.append("<deleted val=\"").append(Boolean.toString(deleted));
    sb.append("\">");
    sb.append('\n');
    sb.append(databaseImpl.dumpString(nSpaces));
    return sb.toString();
  }
  /** 
 * Log type for transactional entries.
 */
  protected LogEntryType getTransactionalLogType(){
    return LogEntryType.LOG_MAPLN_TRANSACTIONAL;
  }
  /** 
 * @see LN#getLogType
 */
  public LogEntryType getLogType(){
    return LogEntryType.LOG_MAPLN;
  }
  /** 
 * @see LN#getLogSize
 */
  public int getLogSize(){
    return super.getLogSize() + databaseImpl.getLogSize() + LogUtils.getBooleanLogSize();
  }
  /** 
 * @see LN#writeToLog
 */
  public void writeToLog(  ByteBuffer logBuffer){
    super.writeToLog(logBuffer);
    databaseImpl.writeToLog(logBuffer);
    LogUtils.writeBoolean(logBuffer,deleted);
  }
  /** 
 * @see LN#readFromLog
 */
  public void readFromLog(  ByteBuffer itemBuffer,  byte entryTypeVersion) throws LogException {
    super.readFromLog(itemBuffer,entryTypeVersion);
    databaseImpl.readFromLog(itemBuffer,entryTypeVersion);
    deleted=LogUtils.readBoolean(itemBuffer);
  }
  /** 
 * Dump additional fields. Done this way so the additional info can be
 * within the XML tags defining the dumped log entry.
 */
  protected void dumpLogAdditional(  StringBuffer sb,  boolean verbose){
    databaseImpl.dumpLog(sb,true);
  }
}