commonsquerylog.java

关于Ultraseek的一些用法,刚初学,所以都是比较简单

/* -*- mode:java; indent-tabs-mode:nil; c-basic-offset:2 -*-
 *  $RCSFile$ $Revision: 1.4 $ $Date: 2006/02/01 00:17:24 $
 *  Copyright (c) 2004 Autonomy Corp.  All Rights Reserved.
 */

import java.io.*;
import java.text.*;
import java.util.*;

import com.ultraseek.xpa.search.*;

import org.apache.commons.logging.Log; 
import org.apache.commons.logging.LogFactory;

/**
 * Logs queries via the Jakarta Commons Logging component.
 */
public class CommonsQueryLog
  implements QueryLog
{
  /* Create a Log named "CommonsQueryLog". */
  private static Log log = LogFactory.getLog(CommonsQueryLog.class);

  private static void logLine(StringBuffer sb,
                              Query query, int numResults,
                              String source, Date when)
    throws QueryNotSupportedException {
    // non-static because not thread safe
    SimpleDateFormat ultraQueryLogDate = 
      new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
      // e.g.               1994/11/06 08:49:37
    sb.append(ultraQueryLogDate.format(when));
    sb.append("\t");
    sb.append(numResults);
    sb.append("\t");
    // no newlines or tabs, as they may be syntax in the log
    source = source.replace('\n', ' ').replace('\t', ' ');
    sb.append(source);
    sb.append("\t");
    String qt = QueryUtil.unparse(query);
    // no newlines or tabs, as they may be syntax in the log
    qt = qt.replace('\n', ' ').replace('\t', ' ');
    sb.append(qt);
  }

  /**
   * {@inheritDoc}
   * Logs a query to a Jakarta Commons Logging Log in the style of the
   * Ultraseek query log file.
   * <p>
   * All messages are logged at the info level.
   */
  public void logQuery(Query query, SearchResultList result,
                       String source, Date when)
    throws QueryNotSupportedException, IOException {

    int numResults = result.getResultCount();

    StringBuffer sb = new StringBuffer(128);
    
    logLine(sb, query, numResults, source, when);
    String entry = sb.toString();

    log.info(entry);
  }
}