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Graylog

There is a newer version: 6.0.0

/**
 * This file is part of Graylog.
 *
 * Graylog 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.
 *
 * Graylog 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 Graylog.  If not, see .
 */
package org.graylog2.jackson;

import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.KeyDeserializer;
import org.joda.time.format.ISOPeriodFormat;

import java.io.IOException;

public class JodaTimePeriodKeyDeserializer extends KeyDeserializer {
    @Override
    public Object deserializeKey(String key, DeserializationContext ctxt) throws IOException {
        if (key.length() == 0) {
            return null;
        }
        return ISOPeriodFormat.standard().parsePeriod(key);
    }
}