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.rel.type;
  
  import org.apache.calcite.sql.type.SqlTypeName;
  
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  import java.io.Serializable;
  import java.util.Objects;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   * Default implementation of {@link RelDataTypeField}.
   */
  public class RelDataTypeFieldImpl implements RelDataTypeField, Serializable {
    //~ Instance fields --------------------------------------------------------
  
    private final RelDataType type;
    private final String name;
    private final int index;
  
    //~ Constructors -----------------------------------------------------------
  
    /**
     * Creates a RelDataTypeFieldImpl.
     */
    public RelDataTypeFieldImpl(
        String name,
        int index,
        RelDataType type) {
      this.name = requireNonNull(name, "name");
      this.index = index;
      this.type = requireNonNull(type, "type");
    }
  
    //~ Methods ----------------------------------------------------------------
  
    @Override public int hashCode() {
      return Objects.hash(index, name, type);
    }
  
    @Override public boolean equals(@Nullable Object obj) {
      if (this == obj) {
        return true;
      }
      if (!(obj instanceof RelDataTypeFieldImpl)) {
        return false;
      }
      RelDataTypeFieldImpl that = (RelDataTypeFieldImpl) obj;
      return this.index == that.index
          && this.name.equals(that.name)
          && this.type.equals(that.type);
    }
  
    // implement RelDataTypeField
    @Override public String getName() {
      return name;
    }
  
    // implement RelDataTypeField
    @Override public int getIndex() {
      return index;
    }
  
    // implement RelDataTypeField
    @Override public RelDataType getType() {
      return type;
    }
  
    // implement Map.Entry
    @Override public final String getKey() {
      return getName();
    }
  
    // implement Map.Entry
    @Override public final RelDataType getValue() {
      return getType();
    }
  
    // implement Map.Entry
    @Override public RelDataType setValue(RelDataType value) {
      throw new UnsupportedOperationException();
    }
  
    // for debugging
    @Override public String toString() {
      return "#" + index + ": " + name + " " + type;
    }
  
    @Override public boolean isDynamicStar() {
      return type.getSqlTypeName() == SqlTypeName.DYNAMIC_STAR;
    }
  
  }
  