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 static java.util.Objects.requireNonNull;
  
  /**
   * Element that describes how a table is a materialization of a query.
   *
   * <p>Occurs within {@link JsonSchema#materializations}.
   *
   * @see JsonRoot Description of schema elements
   */
  public class JsonMaterialization {
    public final @Nullable String view;
    public final @Nullable String table;
  
    /** SQL query that defines the materialization.
     *
     * <p>Must be a string or a list of strings (which are concatenated into a
     * multi-line SQL string, separated by newlines).
     */
    public final Object sql;
  
    public final @Nullable List<String> viewSchemaPath;
  
    @JsonCreator
    public JsonMaterialization(
        @JsonProperty("view") @Nullable String view,
        @JsonProperty("table") @Nullable String table,
        @JsonProperty(value = "sql", required = true) Object sql,
        @JsonProperty("viewSchemaPath") @Nullable List<String> viewSchemaPath) {
      this.view = view;
      this.table = table;
      this.sql = requireNonNull(sql, "sql");
      this.viewSchemaPath = viewSchemaPath;
    }
  
    public void accept(ModelHandler handler) {
      handler.visit(this);
    }
  
    @Override public String toString() {
      return "JsonMaterialization(table=" + table + ", view=" + view + ")";
    }
  
    /** Returns the SQL query as a string, concatenating a list of lines if
     * necessary. */
    public String getSql() {
      return JsonLattice.toString(sql);
    }
  }
  