//
   //  ========================================================================
   //  Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd.
   //  ------------------------------------------------------------------------
   //  All rights reserved. This program and the accompanying materials
   //  are made available under the terms of the Eclipse Public License v1.0
   //  and Apache License v2.0 which accompanies this distribution.
   //
   //      The Eclipse Public License is available at
  //      http://www.eclipse.org/legal/epl-v10.html
  //
  //      The Apache License v2.0 is available at
  //      http://www.opensource.org/licenses/apache2.0.php
  //
  //  You may elect to redistribute this code under either of these licenses.
  //  ========================================================================
  //
  
  package org.eclipse.jetty.util.log;
  
  import java.util.Properties;
  
  /* ------------------------------------------------------------ */
  /** Abstract Logger.
   * Manages the atomic registration of the logger by name.
   */
  public abstract class AbstractLogger implements Logger
  {
      public static final int LEVEL_DEFAULT = -1;
      public static final int LEVEL_ALL = 0;
      public static final int LEVEL_DEBUG = 1;
      public static final int LEVEL_INFO = 2;
      public static final int LEVEL_WARN = 3;
      public static final int LEVEL_OFF = 10;
          
      @Override
      public final Logger getLogger(String name)
      {
          if (isBlank(name))
              return this;
  
          final String basename = getName();
          final String fullname = (isBlank(basename) || Log.getRootLogger()==this)?name:(basename + "." + name);
          
          Logger logger = Log.getLoggers().get(fullname);
          if (logger == null)
          {
              Logger newlog = newLogger(fullname);
              
              logger = Log.getMutableLoggers().putIfAbsent(fullname,newlog);
              if (logger == null)
                  logger=newlog;
          }
  
          return logger;
      }
      
  
      protected abstract Logger newLogger(String fullname);
  
      /**
       * A more robust form of name blank test. Will return true for null names, and names that have only whitespace
       *
       * @param name
       *            the name to test
       * @return true for null or blank name, false if any non-whitespace character is found.
       */
      private static boolean isBlank(String name)
      {
          if (name == null)
          {
              return true;
          }
          int size = name.length();
          char c;
          for (int i = 0; i < size; i++)
          {
              c = name.charAt(i);
              if (!Character.isWhitespace(c))
              {
                  return false;
              }
          }
          return true;
      }
      
      /**
       * Get the Logging Level for the provided log name. Using the FQCN first, then each package segment from longest to
       * shortest.
       *
       * @param props
       *            the properties to check
       * @param name
       *            the name to get log for
       * @return the logging level
       */
      public static int lookupLoggingLevel(Properties props, final String name)
      {
          if ((props == null) || (props.isEmpty()) || name==null )
             return LEVEL_DEFAULT;
         
         // Calculate the level this named logger should operate under.
         // Checking with FQCN first, then each package segment from longest to shortest.
         String nameSegment = name;
     
         while ((nameSegment != null) && (nameSegment.length() > 0))
         {
             String levelStr = props.getProperty(nameSegment + ".LEVEL");
             // System.err.printf("[StdErrLog.CONFIG] Checking for property [%s.LEVEL] = %s%n",nameSegment,levelStr);
             int level = getLevelId(nameSegment + ".LEVEL",levelStr);
             if (level != (-1))
             {
                 return level;
             }
     
             // Trim and try again.
             int idx = nameSegment.lastIndexOf('.');
             if (idx >= 0)
             {
                 nameSegment = nameSegment.substring(0,idx);
             }
             else
             {
                 nameSegment = null;
             }
         }
     
         // Default Logging Level
         return LEVEL_DEFAULT;
     }
 
 
     public static String getLoggingProperty(Properties props, String name, String property)
     {
         // Calculate the level this named logger should operate under.
         // Checking with FQCN first, then each package segment from longest to shortest.
         String nameSegment = name;
     
         while ((nameSegment != null) && (nameSegment.length() > 0))
         {
             String s = props.getProperty(nameSegment+"."+property);
             if (s!=null)
                 return s;
     
             // Trim and try again.
             int idx = nameSegment.lastIndexOf('.');
             nameSegment = (idx >= 0)?nameSegment.substring(0,idx):null;
         }
     
         return null;
     }
 
 
     protected static int getLevelId(String levelSegment, String levelName)
     {
         if (levelName == null)
         {
             return -1;
         }
         String levelStr = levelName.trim();
         if ("ALL".equalsIgnoreCase(levelStr))
         {
             return LEVEL_ALL;
         }
         else if ("DEBUG".equalsIgnoreCase(levelStr))
         {
             return LEVEL_DEBUG;
         }
         else if ("INFO".equalsIgnoreCase(levelStr))
         {
             return LEVEL_INFO;
         }
         else if ("WARN".equalsIgnoreCase(levelStr))
         {
             return LEVEL_WARN;
         }
         else if ("OFF".equalsIgnoreCase(levelStr))
         {
             return LEVEL_OFF;
         }
     
         System.err.println("Unknown StdErrLog level [" + levelSegment + "]=[" + levelStr + "], expecting only [ALL, DEBUG, INFO, WARN, OFF] as values.");
         return -1;
     }
 
 
     /**
      * Condenses a classname by stripping down the package name to just the first character of each package name
      * segment.Configured
      *
      * <pre>
      * Examples:
      * "org.eclipse.jetty.test.FooTest"           = "oejt.FooTest"
      * "org.eclipse.jetty.server.logging.LogTest" = "orjsl.LogTest"
      * </pre>
      *
      * @param classname
      *            the fully qualified class name
      * @return the condensed name
      */
     protected static String condensePackageString(String classname)
     {
         String parts[] = classname.split("\\.");
         StringBuilder dense = new StringBuilder();
         for (int i = 0; i < (parts.length - 1); i++)
         {
             dense.append(parts[i].charAt(0));
         }
         if (dense.length() > 0)
         {
             dense.append('.');
         }
         dense.append(parts[parts.length - 1]);
         return dense.toString();
     }
 
 
     public void debug(String msg, long arg)
     {
         if (isDebugEnabled())
         {
             debug(msg,new Object[] { new Long(arg) });
         }
     }
 }