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 2011-7-5)
   */
  package com.alibaba.cobar.parser.ast.stmt.ddl;
  
  import java.util.Collections;
  import java.util.List;
  
  import com.alibaba.cobar.parser.ast.expression.primary.Identifier;
  import com.alibaba.cobar.parser.visitor.SQLASTVisitor;
  
  /**
   * @author <a href="mailto:shuo.qius@alibaba-inc.com">QIU Shuo</a>
   */
  public class DDLDropTableStatement implements DDLStatement {
      public static enum Mode {
          UNDEF,
          RESTRICT,
          CASCADE
      }
  
      private final List<Identifier> tableNames;
      private final boolean temp;
      private final boolean ifExists;
      private final Mode mode;
  
      public DDLDropTableStatement(List<Identifier> tableNames, boolean temp, boolean ifExists) {
          this(tableNames, temp, ifExists, Mode.UNDEF);
      }
  
      public DDLDropTableStatement(List<Identifier> tableNames, boolean temp, boolean ifExists, Mode mode) {
          if (tableNames == null || tableNames.isEmpty()) {
              this.tableNames = Collections.emptyList();
          } else {
              this.tableNames = tableNames;
          }
          this.temp = temp;
          this.ifExists = ifExists;
          this.mode = mode;
      }
  
      public List<Identifier> getTableNames() {
          return tableNames;
      }
  
      public boolean isTemp() {
          return temp;
      }
  
      public boolean isIfExists() {
          return ifExists;
      }
  
      public Mode getMode() {
          return mode;
      }
  
      @Override
      public void accept(SQLASTVisitor visitor) {
          visitor.visit(this);
      }
  
  }
  