MapDSerializer.java

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/*
 * Copyright 2017 MapD Technologies, 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 com.mapd.calcite.parser;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.mapd.parser.extension.ddl.DdlResponse;
import com.mapd.parser.extension.ddl.JsonSerializableDdl;

import org.apache.calcite.rel.RelNode;
import org.apache.calcite.rel.externalize.MapDRelJsonWriter;

public class MapDSerializer {
  private static final Gson gson;

  static {
    gson = new GsonBuilder().excludeFieldsWithoutExposeAnnotation().create();
  }

  public static String toString(final RelNode rel) {
    if (rel == null) {
      return null;
    }
    final MapDRelJsonWriter planWriter = new MapDRelJsonWriter();
    rel.explain(planWriter);
    return planWriter.asString();
  }

  public static String toJsonString(final JsonSerializableDdl jsonSerializableDdl) {
    final DdlResponse ddlResponse = new DdlResponse();
    ddlResponse.setPayload(jsonSerializableDdl);
    return gson.toJson(ddlResponse);
  }
}