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Graylog message inputs

There is a newer version: 1.3.4

/**
 * 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 .
 */
package org.graylog2.inputs.misc.jsonpath;

import com.google.common.collect.Maps;
import com.jayway.jsonpath.JsonPath;

import java.util.List;
import java.util.Map;

/**
 * @author Lennart Koopmann 
 */
public class Selector {

    private final JsonPath jsonPath;

    public Selector(JsonPath jsonPath) {
        this.jsonPath = jsonPath;
    }


    // This returns a map of message fields because we may want to support reading multiple fields in the future.
    public Map read(String json) {
        Object result = jsonPath.read(json);
        Map fields = Maps.newHashMap();

        if (result instanceof Integer || result instanceof Double || result instanceof Long) {
            fields.put("result", result);
            return fields;
        }

        if (result instanceof List) {
            List list = (List) result;
            if (!list.isEmpty()) {
                fields.put("result", list.get(0).toString());
                return fields;
            }
        }

        // Now it's most likely a string or something we do not map.
        fields.put("result", result.toString());
        return fields;
    }

    public String buildShortMessage(Map fields) {
        StringBuilder shortMessage = new StringBuilder();
        shortMessage.append("JSON API poll result: ");
        shortMessage.append(jsonPath.getPath()).append(" -> ");
        if (fields.toString().length() > 50) {
            shortMessage.append(fields.toString().substring(0, 50)).append("[...]");
        } else {
            shortMessage.append(fields.toString());
        }

        return shortMessage.toString();
    }

}