/**
* 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.regex;
// JDK imports
import java.io.Reader;
import java.io.IOException;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;
// Hadoop imports
import org.apache.hadoop.conf.Configuration;
import org.apache.nutch.net.*;
import org.apache.nutch.urlfilter.api.RegexRule;
import org.apache.nutch.urlfilter.api.RegexURLFilterBase;
import org.apache.nutch.util.NutchConfiguration;
/**
* Filters URLs based on a file of regular expressions using the
* {@link java.util.regex Java Regex implementation}.
*/
public class RegexURLFilter extends RegexURLFilterBase {
public RegexURLFilter() {
super();
}
public RegexURLFilter(String filename)
throws IOException, PatternSyntaxException {
super(filename);
}
RegexURLFilter(Reader reader)
throws IOException, IllegalArgumentException {
super(reader);
}
/* ----------------------------------- *
* <implementation:RegexURLFilterBase> *
* ----------------------------------- */
// Inherited Javadoc
protected String getRulesFile(Configuration conf) {
return conf.get("urlfilter.regex.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 {
RegexURLFilter filter = new RegexURLFilter();
filter.setConf(NutchConfiguration.create());
main(filter, args);
}
private class Rule extends RegexRule {
private Pattern pattern;
Rule(boolean sign, String regex) {
super(sign, regex);
pattern = Pattern.compile(regex);
}
protected boolean match(String url) {
return pattern.matcher(url).find();
}
}
}