Package org.apache.nutch.urlfilter.automaton

Source Code of org.apache.nutch.urlfilter.automaton.AutomatonURLFilter$Rule

/**
* 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;

// JDK imports
import java.io.Reader;
import java.io.IOException;
import java.util.regex.PatternSyntaxException;

// Hadoop imports
import org.apache.hadoop.conf.Configuration;

// Automaton imports
import dk.brics.automaton.RegExp;
import dk.brics.automaton.RunAutomaton;
import org.apache.nutch.net.*;
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 J&eacute;r&ocirc;me Charron
* @see <a href="http://www.brics.dk/automaton/">dk.brics.automaton</a>
*/
public class AutomatonURLFilter extends RegexURLFilterBase {

  public AutomatonURLFilter() {
    super();
  }

  public AutomatonURLFilter(String filename)
    throws IOException, PatternSyntaxException {
    super(filename);
  }

  AutomatonURLFilter(Reader reader)
    throws IOException, IllegalArgumentException {
    super(reader);
  }

 
  /* ----------------------------------- *
   * <implementation:RegexURLFilterBase> *
   * ----------------------------------- */
 
  // Inherited Javadoc
  protected String getRulesFile(Configuration conf) {
    return conf.get("urlfilter.automaton.file");
  }

  // Inherited Javadoc
  protected RegexRule createRule(boolean sign, String regex) {
    return new Rule(sign, regex);
  }
 
  /* ------------------------------------ *
   * </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());
    }

    protected boolean match(String url) {
      return automaton.run(url);
    }
  }
 
}
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