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.runtime.rtti;
  
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  import java.util.Arrays;
  import java.util.Map;
  
  /** Runtime type information for a ROW type. */
  public class RowSqlTypeRtti extends RuntimeTypeInformation {
    private final Map.Entry<String, RuntimeTypeInformation>[] fields;
  
    @SafeVarargs
    public RowSqlTypeRtti(Map.Entry<String, RuntimeTypeInformation>... fields) {
      super(RuntimeSqlTypeName.ROW);
      this.fields = fields;
    }
  
    @Override public String getTypeString()  {
      return "ROW";
    }
  
    // This method is used to serialize the type in Java code implementations,
    // so it should produce a computation that reconstructs the type at runtime
    @Override public String toString() {
      StringBuilder builder = new StringBuilder();
      builder.append("new RowSqlTypeRtti(");
      boolean first = true;
      for (Map.Entry<String, RuntimeTypeInformation> arg : this.fields) {
        if (!first) {
          builder.append(", ");
        }
        first = false;
        builder.append(arg.toString());
      }
      builder.append(")");
      return builder.toString();
    }
  
    @Override public boolean equals(@Nullable Object o) {
      if (this == o) {
        return true;
      }
      if (o == null || getClass() != o.getClass()) {
        return false;
      }
  
      RowSqlTypeRtti that = (RowSqlTypeRtti) o;
      return Arrays.equals(fields, that.fields);
    }
  
    @Override public int hashCode() {
      return Arrays.hashCode(fields);
    }
  
    /** Get the field with the specified index. */
    public Map.Entry<String, RuntimeTypeInformation> getField(int index) {
      return this.fields[index];
    }
  
    public int size() {
      return this.fields.length;
    }
  
    /** Return the runtime type information of the associated field,
     * or null if no such field exists.
     *
     * @param index Field index, starting from 0
     */
    public @Nullable RuntimeTypeInformation getFieldType(Object index) {
      if (index instanceof Integer) {
        int intIndex = (Integer) index;
        if (intIndex < 0 || intIndex >= this.fields.length) {
          return null;
        }
        return this.fields[intIndex].getValue();
      } else if (index instanceof String) {
        String stringIndex = (String) index;
        for (Map.Entry<String, RuntimeTypeInformation> field : this.fields) {
          if (field.getKey().equalsIgnoreCase(stringIndex)) {
            return field.getValue();
          }
        }
      }
      return null;
    }
  }
  