| /* |
| * 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.sling.commons.log.logback.internal; |
| |
| import java.io.PrintWriter; |
| import java.util.Locale; |
| import java.util.regex.Pattern; |
| |
| import org.apache.sling.commons.log.logback.internal.Tailer.TailerListener; |
| |
| class FilteringListener implements TailerListener { |
| public static final String MATCH_ALL = "*"; |
| private final Pattern pattern; |
| private final String regex; |
| private final PrintWriter pw; |
| |
| /** |
| * Constructs a FilteringListener which uses regex pattern to |
| * determine which lines need to be included |
| * |
| * @param pw writer to write the tailed line |
| * @param regex pattern used to filter line. If null or "*" |
| * then all lines would be included. Regex can be simple |
| * string also. In that case search would be done in a |
| * case insensitive way |
| */ |
| public FilteringListener(PrintWriter pw, String regex){ |
| this.pw = pw; |
| this.regex = regex != null ? regex.toLowerCase(Locale.ENGLISH) : null; |
| this.pattern = createPattern(regex); |
| } |
| |
| @Override |
| public void handle(String line) { |
| if (include(line)){ |
| pw.println(line); |
| } |
| } |
| |
| private boolean include(String line) { |
| if (pattern == null) { |
| return true; |
| } |
| |
| String lc = line.toLowerCase(Locale.ENGLISH); |
| if (lc.contains(regex)){ |
| return true; |
| } |
| return pattern.matcher(line).matches(); |
| } |
| |
| private static Pattern createPattern(String regex) { |
| if (regex == null || MATCH_ALL.equals(regex)){ |
| return null; |
| } |
| return Pattern.compile(regex); |
| } |
| } |