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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  
18  package org.apache.log4j.util;
19  
20  public interface Filter {
21    // 06 avr. 2002 18:36:32,036
22    // 18 fevr. 2002 20:05:36,222
23    public static final String ABSOLUTE_DATE_AND_TIME_PAT =
24      "^//d{1,2} .{2,6}//.? 2//d//d//d //d{2}://d{2}://d{2},//d{3}";
25  
26    // 18:54:19,201
27    public static final String ABSOLUTE_TIME_PAT =
28      "^//d{2}://d{2}://d{2},//d{3}";
29    public static final String RELATIVE_TIME_PAT = "^//d{1,10}";
30    final String BASIC_PAT = "//[main//] (FATAL|ERROR|WARN|INFO|DEBUG)";
31    final String ISO8601_PAT =
32      "^//d{4}-//d{2}-//d{2} //d{2}://d{2}://d{2},//d{3}";
33  
34    /***
35     * This filter transforms the input string and returns the results as
36     * output. If the input should be ignored, this method returns null. 
37     * 
38     */
39    String filter(String in) throws UnexpectedFormatException;
40  }