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  import org.apache.oro.text.perl.Perl5Util;
21  
22  public class ControlFilter implements Filter {
23  
24    Perl5Util util = new Perl5Util();
25  
26    String[] allowedPatterns;
27  
28    public ControlFilter(String[] allowedPatterns) {
29      this.allowedPatterns = allowedPatterns;
30    }
31  
32    public 
33    String filter(String in) throws UnexpectedFormatException{
34      int len = allowedPatterns.length;
35      for(int i = 0; i < len; i++) {
36        //System.out.println("["+allowedPatterns[i]+"]");
37        if(util.match("/"+allowedPatterns[i]+"/", in)) {
38  	//System.out.println("["+in+"] matched ["+allowedPatterns[i]);
39  	return in;
40        }	
41      }
42  
43      throw new UnexpectedFormatException("["+in+"]");
44    }
45  }