| /* |
| * 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.nutch.urlfilter.automaton; |
| |
| import java.io.Reader; |
| import java.io.IOException; |
| import java.io.StringReader; |
| import java.util.regex.PatternSyntaxException; |
| |
| import org.apache.hadoop.conf.Configuration; |
| |
| import dk.brics.automaton.RegExp; |
| import dk.brics.automaton.RunAutomaton; |
| import org.apache.nutch.urlfilter.api.RegexRule; |
| import org.apache.nutch.urlfilter.api.RegexURLFilterBase; |
| |
| /** |
| * RegexURLFilterBase implementation based on the <a |
| * href="http://www.brics.dk/automaton/">dk.brics.automaton</a> Finite-State |
| * Automata for Java<sup>TM</sup>. |
| * |
| * @author Jérôme Charron |
| * @see <a href="http://www.brics.dk/automaton/">dk.brics.automaton</a> |
| */ |
| public class AutomatonURLFilter extends RegexURLFilterBase { |
| public static final String URLFILTER_AUTOMATON_FILE = "urlfilter.automaton.file"; |
| public static final String URLFILTER_AUTOMATON_RULES = "urlfilter.automaton.rules"; |
| |
| public AutomatonURLFilter() { |
| super(); |
| } |
| |
| public AutomatonURLFilter(String filename) throws IOException, |
| PatternSyntaxException { |
| super(filename); |
| } |
| |
| AutomatonURLFilter(Reader reader) throws IOException, |
| IllegalArgumentException { |
| super(reader); |
| } |
| |
| /* |
| * ----------------------------------- * <implementation:RegexURLFilterBase> * |
| * ----------------------------------- |
| */ |
| |
| /** |
| * Rules specified as a config property will override rules specified as a |
| * config file. |
| */ |
| protected Reader getRulesReader(Configuration conf) throws IOException { |
| String stringRules = conf.get(URLFILTER_AUTOMATON_RULES); |
| if (stringRules != null) { |
| return new StringReader(stringRules); |
| } |
| String fileRules = conf.get(URLFILTER_AUTOMATON_FILE); |
| return conf.getConfResourceAsReader(fileRules); |
| } |
| |
| // Inherited Javadoc |
| protected RegexRule createRule(boolean sign, String regex) { |
| return new Rule(sign, regex); |
| } |
| |
| protected RegexRule createRule(boolean sign, String regex, String hostOrDomain) { |
| return new Rule(sign, regex, hostOrDomain); |
| } |
| |
| /* |
| * ------------------------------------ * </implementation:RegexURLFilterBase> |
| * * ------------------------------------ |
| */ |
| |
| public static void main(String args[]) throws IOException { |
| main(new AutomatonURLFilter(), args); |
| } |
| |
| private class Rule extends RegexRule { |
| |
| private RunAutomaton automaton; |
| |
| Rule(boolean sign, String regex) { |
| super(sign, regex); |
| automaton = new RunAutomaton(new RegExp(regex, RegExp.ALL).toAutomaton()); |
| } |
| |
| Rule(boolean sign, String regex, String hostOrDomain) { |
| super(sign, regex, hostOrDomain); |
| automaton = new RunAutomaton(new RegExp(regex, RegExp.ALL).toAutomaton()); |
| } |
| |
| protected boolean match(String url) { |
| return automaton.run(url); |
| } |
| } |
| |
| } |