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.cassandra.cql3.ast;
  
  import java.util.stream.Stream;
  
  import org.apache.cassandra.db.marshal.AbstractType;
  
  public class TypeHint implements Expression
  {
      public final Expression e;
      public final AbstractType<?> type;
  
      public TypeHint(Expression e, AbstractType<?> type)
      {
          this.e = e;
          this.type = type;
      }
  
      public TypeHint(Expression e)
      {
          this.e = e;
          this.type = e.type();
      }
  
      /**
       * {@code ? + ?} is not clear to parsing, so rather than assume the type (like we do for literals) we fail and ask
       * the user to CAST... so need to {@link TypeHint} when a {@link Bind} is found.
       *
       * Wait, {@link TypeHint} and not {@link Cast}?  See CASSANDRA-17915...
       */
      public static Expression maybeApplyTypeHint(Expression e)
      {
          if (!(e instanceof Bind))
              return e;
          // see https://the-asf.slack.com/archives/CK23JSY2K/p1663788235000449
          return new TypeHint(e);
      }
  
      @Override
      public void toCQL(StringBuilder sb, CQLFormatter formatter)
      {
          sb.append('(').append(type.asCQL3Type()).append(") ");
          e.toCQL(sb, formatter);
      }
  
      @Override
      public AbstractType<?> type()
      {
          return type;
      }
  
      @Override
      public Stream<? extends Element> stream()
      {
          return Stream.of(e);
      }
  
      @Override
      public Expression visit(Visitor v)
      {
          var u = v.visit(this);
          if (u != this) return u;
          var e = this.e.visit(v);
          if (e == this.e) return this;
          return new TypeHint(e, type);
      }
  }
  