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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  import java.util.regex.Pattern;
21  
22  
23  public class ControlFilter implements Filter {
24    String[] allowedPatterns;
25  
26    public ControlFilter(String[] allowedPatterns) {
27      this.allowedPatterns = allowedPatterns;
28    }
29  
30    public String filter(String in) throws UnexpectedFormatException {
31      int len = allowedPatterns.length;
32  
33      for (int i = 0; i < len; i++) {
34        if (Pattern.compile(allowedPatterns[i]).matcher(in).find()) {
35            return in;
36        }
37      }
38  
39      throw new UnexpectedFormatException("[" + in + "]");
40    }
41  }