/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.log4j.util;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class XMLTimestampFilter implements Filter {

    Pattern pattern = Pattern.compile("(" + "timestamp=\"\\d{10,13}\"" + ")");

    public String filter(String in) {
	Matcher matcher = pattern.matcher(in);
	if (matcher.find()) {
	    StringBuffer buf = new StringBuffer();
	    matcher.appendReplacement(buf, "timestamp=\"XXX\"");
	    matcher.appendTail(buf);
	    return buf.toString();
	} else {
	    return in;
	}
    }
}
