gaffer.serialisation.simple.json.hyperloglogplus.HyperLogLogPlusJsonSerialiser.java Source code

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Here is the source code for gaffer.serialisation.simple.json.hyperloglogplus.HyperLogLogPlusJsonSerialiser.java

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/*
 * Copyright 2016 Crown Copyright
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package gaffer.serialisation.simple.json.hyperloglogplus;

import com.clearspring.analytics.stream.cardinality.HyperLogLogPlus;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.jsontype.TypeSerializer;

import java.io.IOException;

public class HyperLogLogPlusJsonSerialiser extends JsonSerializer<HyperLogLogPlus> {

    // TODO - See 'Can't create HyperLogLogPlus sketches in JSON'
    @Override
    public void serialize(final HyperLogLogPlus hyperLogLogPlus, final JsonGenerator jsonGenerator,
            final SerializerProvider serializerProvider) throws IOException, JsonProcessingException {
        jsonGenerator.writeStartObject();
        _serialise(hyperLogLogPlus, jsonGenerator);
        jsonGenerator.writeEndObject();
    }

    @Override
    public void serializeWithType(final HyperLogLogPlus value, final JsonGenerator gen,
            final SerializerProvider serializers, final TypeSerializer typeSer) throws IOException {
        typeSer.writeTypePrefixForObject(value, gen);
        _serialise(value, gen);
        typeSer.writeTypeSuffixForObject(value, gen);
    }

    private void _serialise(final HyperLogLogPlus hyperLogLogPlus, final JsonGenerator jsonGenerator)
            throws IOException {
        jsonGenerator.writeObjectFieldStart("hyperLogLogPlus");
        jsonGenerator.writeObjectField(HyperLogLogPlusJsonConstants.HYPER_LOG_LOG_PLUS_SKETCH_BYTES_FIELD,
                hyperLogLogPlus.getBytes());
        jsonGenerator.writeNumberField(HyperLogLogPlusJsonConstants.CARDINALITY_FIELD,
                hyperLogLogPlus.cardinality());
        jsonGenerator.writeEndObject();
    }
}