ch.cern.db.flume.sink.elasticsearch.serializer.JSONtoElasticSearchEventSerializer.java Source code

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Here is the source code for ch.cern.db.flume.sink.elasticsearch.serializer.JSONtoElasticSearchEventSerializer.java

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/**
 * Copyright (C) 2016, CERN
 * This software is distributed under the terms of the GNU General Public
 * Licence version 3 (GPL Version 3), copied verbatim in the file "LICENSE".
 * In applying this license, CERN does not waive the privileges and immunities
 * granted to it by virtue of its status as Intergovernmental Organization
 * or submit itself to any jurisdiction.
 */
package ch.cern.db.flume.sink.elasticsearch.serializer;

import static org.elasticsearch.common.xcontent.XContentFactory.jsonBuilder;

import java.io.IOException;
import java.util.Map;
import java.util.Map.Entry;

import org.apache.flume.Context;
import org.apache.flume.Event;
import org.apache.flume.conf.ComponentConfiguration;
import org.elasticsearch.common.xcontent.XContentBuilder;

import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import com.google.gson.JsonPrimitive;

import ch.cern.db.flume.sink.elasticsearch.ContentBuilderUtil;
import ch.cern.db.flume.sink.elasticsearch.ElasticSearchEventSerializer;

public class JSONtoElasticSearchEventSerializer implements ElasticSearchEventSerializer {

    @Override
    public void configure(Context context) {
    }

    @Override
    public void configure(ComponentConfiguration conf) {
    }

    @Override
    public XContentBuilder getContentBuilder(Event event) throws IOException {
        XContentBuilder builder = jsonBuilder().startObject();

        appendHeaders(builder, event);
        appendBody(builder, event);

        return builder;
    }

    private void appendHeaders(XContentBuilder builder, Event event) throws IOException {
        Map<String, String> headers = event.getHeaders();

        for (String key : headers.keySet()) {
            ContentBuilderUtil.appendField(builder, key, headers.get(key).getBytes(charset));
        }
    }

    private void appendBody(XContentBuilder builder, Event event) throws IOException {
        JsonParser parser = new JsonParser();

        JsonObject json = parser.parse(new String(event.getBody())).getAsJsonObject();

        for (Entry<String, JsonElement> property : json.entrySet()) {

            if (property.getValue().isJsonNull()) {
                builder.nullField(property.getKey());

                continue;
            }

            if (!property.getValue().isJsonPrimitive()) {
                builder.field(property.getKey(), property.getValue());

                continue;
            }

            JsonPrimitive primitiveValue = (JsonPrimitive) property.getValue();

            if (primitiveValue.isBoolean())
                builder.field(property.getKey(), primitiveValue.getAsBoolean());
            else if (primitiveValue.isNumber())
                if (primitiveValue.getAsString().indexOf('.') != -1)
                    builder.field(property.getKey(), primitiveValue.getAsNumber().doubleValue());
                else
                    builder.field(property.getKey(), primitiveValue.getAsNumber().longValue());
            else if (primitiveValue.isString())
                builder.field(property.getKey(), primitiveValue.getAsString());
        }
    }

}