package org.kuali.common.jute.logging;
   
   import static com.google.common.base.StandardSystemProperty.LINE_SEPARATOR;
   
   import java.text.SimpleDateFormat;
   import java.util.Date;
   import java.util.List;
   import java.util.logging.Formatter;
   import java.util.logging.LogRecord;
  
  import org.kuali.common.jute.runtime.ProcessIdProvider;
  
  import com.google.common.base.Optional;
  import com.google.common.base.Splitter;
  
  /**
   * Produce a richly formatted log message from a LogRecord.
   *
   * The log message format is:<br>
   * 1 - timestamp<br>
   * 2 - level (INFO,WARN,DEBUG,ERROR)<br>
   * 3 - pid<br>
   * 4 - thread name<br>
   * 5 - class with method name<br>
   * 6 - log message<br>
   *
   * <pre>
   * 2015-01-21 20:26:57.159  INFO 47461 [main] o.k.c.j.b.BuilderTest.info : iterations -> 5,000,000
   * </pre>
   */
  public class LogFormatter extends Formatter {
  
      private static final String FORMAT = "yyyy-MM-dd HH:mm:ss.SSS";
      private static final String LS = LINE_SEPARATOR.value();
      private static final Optional<Integer> PID = ProcessIdProvider.INSTANCE.get();
      private static final Splitter SPLITTER = Splitter.on('.').omitEmptyStrings().trimResults();
  
      @Override
      public String format(LogRecord record) {
  
          SimpleDateFormat format = new SimpleDateFormat(FORMAT);
          String date = format.format(new Date(record.getMillis()));
          String thread = Thread.currentThread().getName();
          String name = shorten(record.getLoggerName());
          String method = record.getSourceMethodName();
  
          StringBuilder sb = new StringBuilder();
          sb.append(date);
          sb.append("  ");
          sb.append(record.getLevel());
          sb.append(" ");
          sb.append(PID.orNull());
          sb.append(" [");
          sb.append(thread);
          sb.append("] ");
          sb.append(name);
          sb.append(".");
          sb.append(method);
          sb.append(" : ");
          sb.append(record.getMessage());
          sb.append(" ");
          sb.append(LS);
          return sb.toString();
      }
  
      protected String shorten(String name) {
          if (name == null) {
              return "root";
          }
          List<String> tokens = SPLITTER.splitToList(name);
          StringBuilder sb = new StringBuilder();
          for (int i = 0; i < tokens.size() - 1; i++) {
              sb.append(tokens.get(i).substring(0, 1));
              sb.append('.');
          }
          sb.append(tokens.get(tokens.size() - 1));
          return sb.toString();
      }
  
  }