io.druid.jackson.DruidDefaultSerializersModule.java Source code

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Here is the source code for io.druid.jackson.DruidDefaultSerializersModule.java

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/*
 * Druid - a distributed column store.
 * Copyright 2012 - 2015 Metamarkets Group Inc.
 *
 * 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 io.druid.jackson;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.module.SimpleModule;
import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;
import com.google.common.base.Throwables;
import com.metamx.common.Granularity;
import com.metamx.common.guava.Accumulator;
import com.metamx.common.guava.Sequence;
import com.metamx.common.guava.Yielder;
import org.joda.time.DateTimeZone;

import java.io.IOException;
import java.nio.ByteOrder;
import java.util.TimeZone;

/**
 */
public class DruidDefaultSerializersModule extends SimpleModule {
    public DruidDefaultSerializersModule() {
        super("Druid default serializers");

        JodaStuff.register(this);
        addDeserializer(Granularity.class, new JsonDeserializer<Granularity>() {
            @Override
            public Granularity deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException {
                return Granularity.valueOf(jp.getText().toUpperCase());
            }
        });
        addDeserializer(DateTimeZone.class, new JsonDeserializer<DateTimeZone>() {
            @Override
            public DateTimeZone deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException {
                String tzId = jp.getText();
                try {
                    return DateTimeZone.forID(tzId);
                } catch (IllegalArgumentException e) {
                    // also support Java timezone strings
                    return DateTimeZone.forTimeZone(TimeZone.getTimeZone(tzId));
                }
            }
        });
        addSerializer(DateTimeZone.class, new JsonSerializer<DateTimeZone>() {
            @Override
            public void serialize(DateTimeZone dateTimeZone, JsonGenerator jsonGenerator,
                    SerializerProvider serializerProvider) throws IOException, JsonProcessingException {
                jsonGenerator.writeString(dateTimeZone.getID());
            }
        });
        addSerializer(Sequence.class, new JsonSerializer<Sequence>() {
            @Override
            public void serialize(Sequence value, final JsonGenerator jgen, SerializerProvider provider)
                    throws IOException, JsonProcessingException {
                jgen.writeStartArray();
                value.accumulate(null, new Accumulator<Object, Object>() {
                    @Override
                    public Object accumulate(Object o, Object o1) {
                        try {
                            jgen.writeObject(o1);
                        } catch (IOException e) {
                            throw Throwables.propagate(e);
                        }
                        return null;
                    }
                });
                jgen.writeEndArray();
            }
        });
        addSerializer(Yielder.class, new JsonSerializer<Yielder>() {
            @Override
            public void serialize(Yielder yielder, final JsonGenerator jgen, SerializerProvider provider)
                    throws IOException, JsonProcessingException {
                try {
                    jgen.writeStartArray();
                    while (!yielder.isDone()) {
                        final Object o = yielder.get();
                        jgen.writeObject(o);
                        yielder = yielder.next(null);
                    }
                    jgen.writeEndArray();
                } finally {
                    yielder.close();
                }
            }
        });
        addSerializer(ByteOrder.class, ToStringSerializer.instance);
        addDeserializer(ByteOrder.class, new JsonDeserializer<ByteOrder>() {
            @Override
            public ByteOrder deserialize(JsonParser jp, DeserializationContext ctxt)
                    throws IOException, JsonProcessingException {
                if (ByteOrder.BIG_ENDIAN.toString().equals(jp.getText())) {
                    return ByteOrder.BIG_ENDIAN;
                }
                return ByteOrder.LITTLE_ENDIAN;
            }
        });
    }
}