/*
    *    Copyright 2016-2025 the original author or authors.
    *
    *    Licensed 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
    *
    *       https://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.mybatis.dynamic.sql;
  
  import java.util.Objects;
  import java.util.Optional;
  
  import org.jspecify.annotations.Nullable;
  import org.mybatis.dynamic.sql.render.RenderingContext;
  import org.mybatis.dynamic.sql.util.FragmentAndParameters;
  
  public class Constant<T> implements BindableColumn<T> {
  
      private final @Nullable String alias;
      private final String value;
  
      private Constant(String value) {
          this(value, null);
      }
  
      private Constant(String value, @Nullable String alias) {
          this.value = Objects.requireNonNull(value);
          this.alias = alias;
      }
  
      @Override
      public Optional<String> alias() {
          return Optional.ofNullable(alias);
      }
  
      @Override
      public FragmentAndParameters render(RenderingContext renderingContext) {
          return FragmentAndParameters.fromFragment(value);
      }
  
      @Override
      public Constant<T> as(String alias) {
          return new Constant<>(value, alias);
      }
  
      public static <T> Constant<T> of(String value) {
          return new Constant<>(value);
      }
  }