co.cask.cdap.api.dataset.lib.partitioned.PartitionKeyCodec.java Source code

Introduction

Here is the source code for co.cask.cdap.api.dataset.lib.partitioned.PartitionKeyCodec.java

Source

/*
 * Copyright  2015-2016 Cask Data, 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 co.cask.cdap.api.dataset.lib.partitioned;

import co.cask.cdap.api.dataset.lib.PartitionKey;
import com.google.gson.JsonArray;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParseException;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;

import java.lang.reflect.Type;
import java.util.Map;

/**
 * Codec used to serialize and deserialize {@link PartitionKey}s.
 */
public class PartitionKeyCodec extends ComparableCodec
        implements JsonSerializer<PartitionKey>, JsonDeserializer<PartitionKey> {

    @Override
    public PartitionKey deserialize(JsonElement jsonElement, Type type,
            JsonDeserializationContext jsonDeserializationContext) throws JsonParseException {
        JsonObject jsonObject = jsonElement.getAsJsonObject();
        PartitionKey.Builder builder = PartitionKey.builder();
        for (Map.Entry<String, JsonElement> entry : jsonObject.entrySet()) {
            JsonArray jsonArray = entry.getValue().getAsJsonArray();
            builder.addField(entry.getKey(), deserializeComparable(jsonArray, jsonDeserializationContext));
        }
        return builder.build();
    }

    @Override
    public JsonElement serialize(PartitionKey partitionKey, Type type,
            JsonSerializationContext jsonSerializationContext) {
        JsonObject jsonObj = new JsonObject();
        for (Map.Entry<String, Comparable> entry : partitionKey.getFields().entrySet()) {
            jsonObj.add(entry.getKey(), serializeComparable(entry.getValue(), jsonSerializationContext));
        }
        return jsonObj;
    }
}