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 com.datastax.oss.driver.internal.querybuilder.select;
  
  import com.datastax.oss.driver.api.core.CqlIdentifier;
  import com.datastax.oss.driver.api.querybuilder.select.Selector;
  import com.datastax.oss.driver.shaded.guava.common.base.Preconditions;
  import edu.umd.cs.findbugs.annotations.NonNull;
  import edu.umd.cs.findbugs.annotations.Nullable;
  import java.util.Objects;
  import net.jcip.annotations.Immutable;
  
  @Immutable
  public class FieldSelector implements Selector {
  
    private final Selector udt;
    private final CqlIdentifier fieldId;
    private final CqlIdentifier alias;
  
    public FieldSelector(@NonNull Selector udt, @NonNull CqlIdentifier fieldId) {
      this(udt, fieldId, null);
    }
  
    public FieldSelector(
        @NonNull Selector udt, @NonNull CqlIdentifier fieldId, @Nullable CqlIdentifier alias) {
      Preconditions.checkNotNull(udt);
      Preconditions.checkNotNull(fieldId);
      this.udt = udt;
      this.fieldId = fieldId;
      this.alias = alias;
    }
  
    @NonNull
    @Override
    public Selector as(@NonNull CqlIdentifier alias) {
      return new FieldSelector(udt, fieldId, alias);
    }
  
    @Override
    public void appendTo(@NonNull StringBuilder builder) {
      udt.appendTo(builder);
      builder.append('.').append(fieldId.asCql(true));
      if (alias != null) {
        builder.append(" AS ").append(alias.asCql(true));
      }
    }
  
    @NonNull
    public Selector getUdt() {
      return udt;
    }
  
    @NonNull
    public CqlIdentifier getFieldId() {
      return fieldId;
    }
  
    @Nullable
    @Override
    public CqlIdentifier getAlias() {
      return alias;
    }
  
    @Override
    public boolean equals(Object other) {
      if (other == this) {
        return true;
      } else if (other instanceof FieldSelector) {
        FieldSelector that = (FieldSelector) other;
        return this.udt.equals(that.udt)
            && this.fieldId.equals(that.fieldId)
            && Objects.equals(this.alias, that.alias);
      } else {
        return false;
      }
    }
  
    @Override
    public int hashCode() {
      return Objects.hash(udt, fieldId, alias);
    }
  }
  