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    1   /*
    2    * Copyright 2001-2004 The Apache Software Foundation.
    3    *
    4    * Licensed under the Apache License, Version 2.0 (the "License");
    5    * you may not use this file except in compliance with the License.
    6    * You may obtain a copy of the License at
    7    *
    8    *      http://www.apache.org/licenses/LICENSE-2.0
    9    *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16
    17  // Contributors:  Kitching Simon <Simon.Kitching@orange.ch>
    18  //                Nicholas Wolff
    19
    20  package org.apache.log4j;
    21
    22  import java.io.IOException;
    23  import java.io.ObjectInputStream;
    24  import java.io.ObjectOutputStream;
    25  import java.io.ObjectStreamException;
    26  import java.io.Serializable;
    27
    28  /**
    29     Defines the minimum set of levels recognized by the system, that is
    30     <code>OFF</code>, <code>FATAL</code>, <code>ERROR</code>,
    31     <code>WARN</code>, <code>INFO</code>, <code>DEBUG</code> and
    32     <code>ALL</code>.
    33
    34     <p>The <code>Level</code> class may be subclassed to define a larger
    35     level set.
    36
    37     @author Ceki G&uuml;lc&uuml;
    38
    39   */
    40  public class Level extends Priority implements Serializable {
    41
    42      /**
    43       * TRACE level integer value.
    44       * @since 1.2.12
    45       */
    46      public static final int TRACE_INT = 5000;
    47
    48      // match jboss' xlevel
    49      public static final int X_TRACE_INT = DEBUG_INT - 100;
    50
    51      /**
    52         The <code>OFF</code> has the highest possible rank and is
    53         intended to turn off logging.  */
    54      final static public Level OFF = new Level(OFF_INT, "OFF", 0);
    55
    56      /**
    57         The <code>FATAL</code> level designates very severe error
    58         events that will presumably lead the application to abort.
    59       */
    60      final static public Level FATAL = new Level(FATAL_INT, "FATAL", 0);
    61
    62      /**
    63         The <code>ERROR</code> level designates error events that
    64         might still allow the application to continue running.  */
    65      final static public Level ERROR = new Level(ERROR_INT, "ERROR", 3);
    66
    67      /**
    68         The <code>WARN</code> level designates potentially harmful situations.
    69      */
    70      final static public Level WARN = new Level(WARN_INT, "WARN", 4);
    71
    72      /**
    73         The <code>INFO</code> level designates informational messages
    74         that highlight the progress of the application at coarse-grained
    75         level.  */
    76      final static public Level INFO = new Level(INFO_INT, "INFO", 6);
    77
    78      /**
    79         The <code>DEBUG</code> Level designates fine-grained
    80         informational events that are most useful to debug an
    81         application.  */
    82      final static public Level DEBUG = new Level(DEBUG_INT, "DEBUG", 7);
    83
    84      /**
    85        * The <code>TRACE</code> Level designates finer-grained
    86        * informational events than the <code>DEBUG</code level.
    87       *  @since 1.2.12
    88        */
    89      public static final Level TRACE = new Level(TRACE_INT, "TRACE", 7);
    90
    91      /**
    92         The <code>ALL</code> has the lowest possible rank and is intended to
    93         turn on all logging.  */
    94      final static public Level ALL = new Level(ALL_INT, "ALL", 7);
    95
    96      /**
    97       * Serialization version id.
    98       */
    99      static final long serialVersionUID = 3491141966387921974L;
    100
    101     /**
    102        Instantiate a Level object.
    103      */
    104     protected Level(int level, String levelStr, int syslogEquivalent) {
    105         super(level, levelStr, syslogEquivalent);
    106     }
    107
    108     /**
    109        Convert the string passed as argument to a level. If the
    110        conversion fails, then this method returns {@link #DEBUG}.
    111     */
    112     public static Level toLevel(String sArg) {
    113         return (Level) toLevel(sArg, Level.DEBUG);
    114     }
    115
    116     /**
    117       Convert an integer passed as argument to a level. If the
    118       conversion fails, then this method returns {@link #DEBUG}.
    119
    120     */
    121     public static Level toLevel(int val) {
    122         return (Level) toLevel(val, Level.DEBUG);
    123     }
    124
    125     /**
    126       Convert an integer passed as argument to a level. If the
    127       conversion fails, then this method returns the specified default.
    128     */
    129     public static Level toLevel(int val, Level defaultLevel) {
    130         switch (val) {
    131         case ALL_INT:
    132             return ALL;
    133         case DEBUG_INT:
    134             return Level.DEBUG;
    135         case INFO_INT:
    136             return Level.INFO;
    137         case WARN_INT:
    138             return Level.WARN;
    139         case ERROR_INT:
    140             return Level.ERROR;
    141         case FATAL_INT:
    142             return Level.FATAL;
    143         case OFF_INT:
    144             return OFF;
    145         case TRACE_INT:
    146             return Level.TRACE;
    147         default:
    148             return defaultLevel;
    149         }
    150     }
    151
    152     /**
    153        Convert the string passed as argument to a level. If the
    154        conversion fails, then this method returns the value of
    155        <code>defaultLevel</code>.
    156     */
    157     public static Level toLevel(String sArg, Level defaultLevel) {
    158         if (sArg == null)
    159             return defaultLevel;
    160
    161         String s = sArg.toUpperCase();
    162
    163         if (s.equals("ALL"))
    164             return Level.ALL;
    165         if (s.equals("DEBUG"))
    166             return Level.DEBUG;
    167         if (s.equals("INFO"))
    168             return Level.INFO;
    169         if (s.equals("WARN"))
    170             return Level.WARN;
    171         if (s.equals("ERROR"))
    172             return Level.ERROR;
    173         if (s.equals("FATAL"))
    174             return Level.FATAL;
    175         if (s.equals("OFF"))
    176             return Level.OFF;
    177         if (s.equals("TRACE"))
    178             return Level.TRACE;
    179         return defaultLevel;
    180     }
    181
    182     /**
    183      * Custom deserialization of Level.
    184      * @param s serialization stream.
    185      * @throws IOException if IO exception.
    186      * @throws ClassNotFoundException if class not found.
    187      */
    188     private void readObject(final ObjectInputStream s) throws IOException, ClassNotFoundException {
    189         s.defaultReadObject();
    190         level = s.readInt();
    191         syslogEquivalent = s.readInt();
    192         levelStr = s.readUTF();
    193         if (levelStr == null) {
    194             levelStr = "";
    195         }
    196     }
    197
    198     /**
    199      * Serialize level.
    200      * @param s serialization stream.
    201      * @throws IOException if exception during serialization.
    202      */
    203     private void writeObject(final ObjectOutputStream s) throws IOException {
    204         s.defaultWriteObject();
    205         s.writeInt(level);
    206         s.writeInt(syslogEquivalent);
    207         s.writeUTF(levelStr);
    208     }
    209
    210     /**
    211      * Resolved deserialized level to one of the stock instances.
    212      * May be overridden in classes derived from Level.
    213      * @return resolved object.
    214      * @throws ObjectStreamException if exception during resolution.
    215      */
    216     private Object readResolve() throws ObjectStreamException {
    217         //
    218         // if the deserialized object is exactly an instance of Level
    219         //
    220         if (getClass() == Level.class) {
    221             return toLevel(level);
    222         }
    223         //
    224         // extension of Level can't substitute stock item
    225         //
    226         return this;
    227     }
    228 }