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;
  
  public class StandardVisitors
  {
      public static final Visitor BIND_TO_LITERAL = new Visitor()
      {
          @Override
          public Value visit(Value v)
          {
              if (!(v instanceof Bind)) return v;
              Bind b = (Bind) v;
              return new Literal(b.value(), b.type());
          }
      };
      public static final Visitor LITERAL_TO_BIND = new Visitor()
      {
          @Override
          public Value visit(Value v)
          {
              if (!(v instanceof Literal)) return v;
              Literal b = (Literal) v;
              return new Bind(b.value(), b.type());
          }
      };
  
      public static final Visitor UNWRAP_TYPE_HINT = new Visitor()
      {
          @Override
          public Expression visit(Expression e)
          {
              if (!(e instanceof TypeHint)) return e;
              TypeHint hint = (TypeHint) e;
              if (hint.type.equals(hint.e.type()))
                  return hint.e;
              return e;
          }
      };
  
      public static final Visitor APPLY_OPERATOR = new Visitor()
      {
          @Override
          public Expression visit(Expression e)
          {
              if (!(e instanceof Operator)) return e;
              return new Bind(ExpressionEvaluator.eval((Operator) e), e.type());
          }
      };
  
      public static final Visitor.CompositeVisitor DEBUG = Visitor.CompositeVisitor.of(UNWRAP_TYPE_HINT, BIND_TO_LITERAL);
  
      private StandardVisitors() {}
  }
  