/**
* This file is part of Graylog2.
*
* Graylog2 is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Graylog2 is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Graylog2. If not, see <http://www.gnu.org/licenses/>.
*/
package org.graylog2.inputs.extractors;
import com.codahale.metrics.MetricRegistry;
import org.graylog2.ConfigurationException;
import org.graylog2.plugin.inputs.Converter;
import org.graylog2.plugin.inputs.Extractor;
import java.util.List;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class RegexExtractor extends Extractor {
private static final String CONFIG_REGEX_VALUE = "regex_value".intern();
private final Pattern pattern;
public RegexExtractor(final MetricRegistry metricRegistry,
final String id,
final String title,
final int order,
final CursorStrategy cursorStrategy,
final String sourceField,
final String targetField,
final Map<String, Object> extractorConfig,
final String creatorUserId,
final List<Converter> converters,
final ConditionType conditionType,
final String conditionValue) throws ReservedFieldException, ConfigurationException {
super(metricRegistry, id, title, order, Type.REGEX, cursorStrategy, sourceField, targetField, extractorConfig, creatorUserId, converters, conditionType, conditionValue);
if (extractorConfig == null || extractorConfig.get(CONFIG_REGEX_VALUE) == null || ((String) extractorConfig.get(CONFIG_REGEX_VALUE)).isEmpty()) {
throw new ConfigurationException("Missing regex configuration field: regex_value");
}
pattern = Pattern.compile((String) extractorConfig.get(CONFIG_REGEX_VALUE), Pattern.DOTALL);
}
@Override
protected Result run(String value) {
final Matcher matcher = pattern.matcher(value);
if (!matcher.find() || matcher.groupCount() == 0 || matcher.start(1) == -1 || matcher.end(1) == -1) {
return null;
}
return new Result(value.substring(matcher.start(1), matcher.end(1)), matcher.start(1), matcher.end(1));
}
}