/**
* 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.Tools;
import org.graylog2.plugin.inputs.Converter;
import org.graylog2.plugin.inputs.Extractor;
import java.util.List;
import java.util.Map;
/**
* @author Lennart Koopmann <lennart@torch.sh>
*/
public class SubstringExtractor extends Extractor {
private int beginIndex = -1;
private int endIndex = -1;
public SubstringExtractor(MetricRegistry metricRegistry,
String id,
String title,
int order,
CursorStrategy cursorStrategy,
String sourceField,
String targetField,
Map<String, Object> extractorConfig,
String creatorUserId,
List<Converter> converters,
ConditionType conditionType,
String conditionValue) throws ReservedFieldException, ConfigurationException {
super(metricRegistry, id, title, order, Type.SUBSTRING, cursorStrategy, sourceField, targetField, extractorConfig, creatorUserId, converters, conditionType, conditionValue);
if (extractorConfig == null || extractorConfig.get("begin_index") == null || extractorConfig.get("end_index") == null) {
throw new ConfigurationException("Missing configuration fields. Required: begin_index, end_index");
}
try {
beginIndex = (Integer) extractorConfig.get("begin_index");
endIndex = (Integer) extractorConfig.get("end_index");
} catch (ClassCastException e) {
throw new ConfigurationException("Index positions cannot be casted to Integer.");
}
}
@Override
protected Result run(String value) {
return new Result(Tools.safeSubstring(value, beginIndex, endIndex), beginIndex, endIndex);
}
}