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      1 /* Copyright (C) 2003 Vladimir Roubtsov. All rights reserved.
      2  *
      3  * This program and the accompanying materials are made available under
      4  * the terms of the Common Public License v1.0 which accompanies this distribution,
      5  * and is available at http://www.eclipse.org/legal/cpl-v10.html
      6  *
      7  * $Id: AppLoggers.java,v 1.1.2.1 2004/07/16 23:32:03 vlad_r Exp $
      8  */
      9 package com.vladium.emma;
     10 
     11 import java.util.HashSet;
     12 import java.util.Set;
     13 import java.util.StringTokenizer;
     14 
     15 import com.vladium.logging.ILogLevels;
     16 import com.vladium.logging.Logger;
     17 import com.vladium.util.IProperties;
     18 import com.vladium.util.Strings;
     19 
     20 // ----------------------------------------------------------------------------
     21 /**
     22  * @author Vlad Roubtsov, (C) 2004
     23  */
     24 public
     25 abstract class AppLoggers
     26 {
     27     // public: ................................................................
     28 
     29     public static final String PREFIX_VERBOSITY                 = "verbosity.";
     30 
     31     public static final String PROPERTY_VERBOSITY_LEVEL         = PREFIX_VERBOSITY + "level";
     32     public static final String DEFAULT_VERBOSITY_LEVEL          = ILogLevels.INFO_STRING;
     33 
     34     public static final String PROPERTY_VERBOSITY_FILTER        = PREFIX_VERBOSITY + "filter";
     35 
     36     public static Logger create (final String appName, final IProperties properties, final Logger base)
     37     {
     38         if (properties == null)
     39             throw new IllegalArgumentException ("null input: properties");
     40 
     41         // verbosity level:
     42 
     43         final int level;
     44         {
     45             final String _level = properties.getProperty (PROPERTY_VERBOSITY_LEVEL,
     46                                                           DEFAULT_VERBOSITY_LEVEL);
     47             level = Logger.stringToLevel (_level);
     48         }
     49 
     50         // verbosity filter:
     51 
     52         final Set filter;
     53         {
     54             final String _filter = properties.getProperty (PROPERTY_VERBOSITY_FILTER);
     55             Set temp = null;
     56 
     57             if (_filter != null)
     58             {
     59                 final StringTokenizer tokenizer = new StringTokenizer (_filter, COMMA_DELIMITERS);
     60                 if (tokenizer.countTokens () > 0)
     61                 {
     62                     temp = new HashSet (tokenizer.countTokens ());
     63                     while (tokenizer.hasMoreTokens ())
     64                     {
     65                         temp.add (tokenizer.nextToken ());
     66                     }
     67                 }
     68             }
     69 
     70             filter = temp;
     71         }
     72 
     73         return Logger.create (level, null, appName, filter, base);
     74     }
     75 
     76 
     77 
     78     // protected: .............................................................
     79 
     80     // package: ...............................................................
     81 
     82     // private: ...............................................................
     83 
     84 
     85     private AppLoggers () {} // this class is not extendible
     86 
     87     private static final String COMMA_DELIMITERS    = "," + Strings.WHITE_SPACE;
     88 
     89 } // end of class
     90 // ----------------------------------------------------------------------------