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/*
 * 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.iceberg.expressions;

class RewriteNot extends ExpressionVisitors.ExpressionVisitor {
  private static final RewriteNot INSTANCE = new RewriteNot();

  static RewriteNot get() {
    return INSTANCE;
  }

  private RewriteNot() {
  }

  @Override
  public Expression alwaysTrue() {
    return Expressions.alwaysTrue();
  }

  @Override
  public Expression alwaysFalse() {
    return Expressions.alwaysFalse();
  }

  @Override
  public Expression not(Expression result) {
    return result.negate();
  }

  @Override
  public Expression and(Expression leftResult, Expression rightResult) {
    return Expressions.and(leftResult, rightResult);
  }

  @Override
  public Expression or(Expression leftResult, Expression rightResult) {
    return Expressions.or(leftResult, rightResult);
  }

  @Override
  public  Expression predicate(BoundPredicate pred) {
    return pred;
  }

  @Override
  public  Expression predicate(UnboundPredicate pred) {
    return pred;
  }
}