content: /*
   * Copyright 1999-2017 Alibaba Group Holding Ltd.
   *
   * 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.
   */
  package com.alibaba.druid.sql.ast.statement;
  
  import com.alibaba.druid.DbType;
  import com.alibaba.druid.sql.ast.*;
  import com.alibaba.druid.sql.visitor.SQLASTVisitor;
  
  import java.util.ArrayList;
  import java.util.List;
  
  public class SQLDropIndexStatement extends SQLStatementImpl implements SQLDropStatement, SQLReplaceable {
      private SQLName indexName;
      private SQLExprTableSource tableName;
  
      private SQLExpr algorithm;
      private SQLExpr lockOption;
      private boolean ifExists;
  
      public SQLDropIndexStatement() {
      }
  
      public SQLDropIndexStatement(DbType dbType) {
          super(dbType);
      }
  
      public SQLName getIndexName() {
          return indexName;
      }
  
      public void setIndexName(SQLName indexName) {
          this.indexName = indexName;
      }
  
      public SQLExprTableSource getTableName() {
          return tableName;
      }
  
      public void setTableName(SQLName tableName) {
          this.setTableName(new SQLExprTableSource(tableName));
      }
  
      public void setTableName(SQLExprTableSource tableName) {
          this.tableName = tableName;
      }
  
      public SQLExpr getAlgorithm() {
          return algorithm;
      }
  
      public void setAlgorithm(SQLExpr x) {
          if (x != null) {
              x.setParent(this);
          }
          this.algorithm = x;
      }
  
      public SQLExpr getLockOption() {
          return lockOption;
      }
  
      public void setLockOption(SQLExpr x) {
          if (x != null) {
              x.setParent(this);
          }
          this.lockOption = x;
      }
  
      @Override
      protected void accept0(SQLASTVisitor visitor) {
          if (visitor.visit(this)) {
              acceptChild(visitor, indexName);
              acceptChild(visitor, tableName);
              acceptChild(visitor, algorithm);
              acceptChild(visitor, lockOption);
          }
          visitor.endVisit(this);
      }
  
      @Override
      public List<SQLObject> getChildren() {
          List<SQLObject> children = new ArrayList<SQLObject>();
          if (indexName != null) {
              children.add(indexName);
          }
          if (tableName != null) {
              children.add(tableName);
          }
          return children;
      }
  
      public boolean replace(SQLExpr expr, SQLExpr target) {
          if (indexName == expr) {
              setIndexName((SQLName) target);
              return true;
          }
  
          if (algorithm == expr) {
              setAlgorithm(target);
              return true;
          }
  
          if (lockOption == expr) {
              setLockOption(target);
              return true;
          }
  
          return false;
      }
  
      public boolean isIfExists() {
          return ifExists;
      }
  
      public void setIfExists(boolean ifExists) {
          this.ifExists = ifExists;
      }
  
      @Override
      public DDLObjectType getDDLObjectType() {
          return DDLObjectType.INDEX;
      }
  }
  