content: /*
   * 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.model;
  
  import com.fasterxml.jackson.annotation.JsonCreator;
  import com.fasterxml.jackson.annotation.JsonProperty;
  
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  import java.util.List;
  import java.util.Map;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   * JSON schema element that represents a custom schema.
   *
   * <p>Like the base class {@link JsonSchema},
   * occurs within {@link JsonRoot#schemas}.
   *
   * @see org.apache.calcite.model.JsonRoot Description of schema elements
   */
  public class JsonCustomSchema extends JsonMapSchema {
    /** Name of the factory class for this schema.
     *
     * <p>Required. Must implement interface
     * {@link org.apache.calcite.schema.SchemaFactory} and have a public default
     * constructor.
     */
    public final String factory;
  
    /** Contains attributes to be passed to the factory.
     *
     * <p>May be a JSON object (represented as Map) or null.
     */
    public final @Nullable Map<String, Object> operand;
  
    @JsonCreator
    public JsonCustomSchema(
        @JsonProperty(value = "name", required = true) String name,
        @JsonProperty("path") @Nullable List<Object> path,
        @JsonProperty("cache") @Nullable Boolean cache,
        @JsonProperty("autoLattice") @Nullable Boolean autoLattice,
        @JsonProperty(value = "factory", required = true) String factory,
        @JsonProperty("operand") @Nullable Map<String, Object> operand) {
      super(name, path, cache, autoLattice);
      this.factory = requireNonNull(factory, "factory");
      this.operand = operand;
    }
  
    @Override public void accept(ModelHandler handler) {
      handler.visit(this);
    }
  
    @Override public String toString() {
      return "JsonCustomSchema(name=" + name + ")";
    }
  }
  