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 }