/*
 * Copyright (c) 2003, KNOPFLERFISH project
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following
 * conditions are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials
 *   provided with the distribution.
 *
 * - Neither the name of the KNOPFLERFISH project nor the names of its
 *   contributors may be used to endorse or promote products derived
 *   from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.knopflerfish.service.log;

import org.osgi.service.log.*;

/**
 ** Utility class for the LogService interface.
 ** It exports methods that translates between the numeric values of
 ** the severity level constants and human readable strings.
 **/

public class LogUtil 
{
  /**
   ** Converts from a numeric log severity level to a string.
   **
   ** @param level is the log severity level.
   **/
  static public String fromLevel(int level) {
    return fromLevel(level,0);
  }	     

  /**
   ** Converts from a numeric log severity level to a left justified
   ** string of at least the given length.
   **
   ** @param level is the log severity level.
   ** @param length the minimum length of the resulting string.
   **/
  static public String fromLevel(int level, int length) {
    StringBuffer sb = new StringBuffer(length>7 ? length : 7 );
    switch(level) {
    case LogService.LOG_INFO:
      sb.append("info");
      break;
    case LogService.LOG_DEBUG:
      sb.append("debug");
      break;
    case LogService.LOG_WARNING:
      sb.append("Warning");
      break;
    case LogService.LOG_ERROR:
      sb.append("ERROR");
      break;
    case 0:
	sb.append("DEFAULT");
	break;
    default:
      sb.append("[");
      sb.append(level);
      sb.append("]");
    }
    for (int i=sb.length();i<length;i++) {
      sb.append(" ");
    }
    return sb.toString();
  }	     

  /**
   ** Converts a string representing a log severity level to an int.
   **
   ** @param level The string to convert.
   ** @param def Default value to use if the string is not
   **        recognized as a log level.
   ** @return the log level, or the default value if the string can
   **         not be recognized. 
   **/
  static public int toLevel(String level, int def) {
    if(level.equalsIgnoreCase("INFO")) {
      return LogService.LOG_INFO;
    } else if(level.equalsIgnoreCase("DEBUG")) {
      return LogService.LOG_DEBUG;
    } else if(level.equalsIgnoreCase("WARNING")) {
      return LogService.LOG_WARNING;
    } else if(level.equalsIgnoreCase("ERROR")) {
      return LogService.LOG_ERROR;
    } else if(level.equalsIgnoreCase("DEFAULT")) {
      return 0;
    }
    return def;
  }

}