elasticsearch2/src/main/java/org/apache/calcite/adapter/elasticsearch2/Elasticsearch2SchemaFactory.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to you 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 org.apache.calcite.adapter.elasticsearch2;

import org.apache.calcite.schema.Schema;
import org.apache.calcite.schema.SchemaFactory;
import org.apache.calcite.schema.SchemaPlus;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;

import java.io.IOException;
import java.util.Map;

/**
 * Factory that creates an {@link Elasticsearch2Schema}.
 *
 * <p>Allows a custom schema to be included in a model.json file.
 */
@SuppressWarnings("UnusedDeclaration")
public class Elasticsearch2SchemaFactory implements SchemaFactory {

  public Elasticsearch2SchemaFactory() {
  }

  @Override public Schema create(SchemaPlus parentSchema, String name,
      Map<String, Object> operand) {
    final Map map = (Map) operand;

    final ObjectMapper mapper = new ObjectMapper();
    mapper.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true);

    try {
      final Map<String, Integer> coordinates =
          mapper.readValue((String) map.get("coordinates"),
              new TypeReference<Map<String, Integer>>() { });
      final Map<String, String> userConfig =
          mapper.readValue((String) map.get("userConfig"),
              new TypeReference<Map<String, String>>() { });
      final String index = (String) map.get("index");
      return new Elasticsearch2Schema(coordinates, userConfig, index);
    } catch (IOException e) {
      throw new RuntimeException("Cannot parse values from json", e);
    }
  }
}

// End Elasticsearch2SchemaFactory.java