co.cask.cdap.api.dataset.lib.ConditionCodec.java Source code

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

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/*
 * Copyright  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;

import co.cask.cdap.api.dataset.lib.partitioned.ComparableCodec;
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;

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

    @Override
    public PartitionFilter.Condition deserialize(JsonElement jsonElement, Type type,
            JsonDeserializationContext deserializationContext) throws JsonParseException {

        JsonObject jsonObject = jsonElement.getAsJsonObject();
        boolean isSingleValue = jsonObject.get("isSingleValue").getAsBoolean();
        if (isSingleValue) {
            return new PartitionFilter.Condition<>(jsonObject.get("fieldName").getAsString(),
                    deserializeComparable(jsonObject.get("lower"), deserializationContext));
        } else {
            return new PartitionFilter.Condition<>(jsonObject.get("fieldName").getAsString(),
                    deserializeComparable(jsonObject.get("lower"), deserializationContext),
                    deserializeComparable(jsonObject.get("upper"), deserializationContext));
        }
    }

    @Override
    public JsonElement serialize(PartitionFilter.Condition condition, Type type,
            JsonSerializationContext jsonSerializationContext) {
        JsonObject jsonObj = new JsonObject();
        jsonObj.addProperty("fieldName", condition.getFieldName());
        jsonObj.add("lower", serializeComparable(condition.getLower(), jsonSerializationContext));
        jsonObj.add("upper", serializeComparable(condition.getUpper(), jsonSerializationContext));
        jsonObj.addProperty("isSingleValue", condition.isSingleValue());
        return jsonObj;
    }
}