content: /*
   * Copyright 1999-2012 Alibaba Group.
   *  
   * 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
   *  
   *      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.
   */
  /**
   * (created at 2011-2-9)
   */
  package com.alibaba.cobar.parser.ast.fragment.tableref;
  
  import com.alibaba.cobar.parser.visitor.SQLASTVisitor;
  
  /**
   * @author <a href="mailto:shuo.qius@alibaba-inc.com">QIU Shuo</a>
   */
  public class NaturalJoin implements TableReference {
      private final boolean isOuter;
      /**
       * make sense only if {@link #isOuter} is true. Eigher <code>LEFT</code> or
       * <code>RIGHT</code>
       */
      private final boolean isLeft;
      private final TableReference leftTableRef;
      private final TableReference rightTableRef;
  
      public NaturalJoin(boolean isOuter, boolean isLeft, TableReference leftTableRef, TableReference rightTableRef) {
          super();
          this.isOuter = isOuter;
          this.isLeft = isLeft;
          this.leftTableRef = leftTableRef;
          this.rightTableRef = rightTableRef;
      }
  
      public boolean isOuter() {
          return isOuter;
      }
  
      public boolean isLeft() {
          return isLeft;
      }
  
      public TableReference getLeftTableRef() {
          return leftTableRef;
      }
  
      public TableReference getRightTableRef() {
          return rightTableRef;
      }
  
      @Override
      public Object removeLastConditionElement() {
          return null;
      }
  
      @Override
      public boolean isSingleTable() {
          return false;
      }
  
      @Override
      public int getPrecedence() {
          return TableReference.PRECEDENCE_JOIN;
      }
  
      @Override
      public void accept(SQLASTVisitor visitor) {
          visitor.visit(this);
      }
  }
  