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 2011-1-27)
   */
  package com.alibaba.cobar.parser.ast.stmt.dml;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import com.alibaba.cobar.parser.ast.expression.Expression;
  import com.alibaba.cobar.parser.ast.stmt.SQLStatement;
  import com.alibaba.cobar.parser.visitor.MySQLOutputASTVisitor;
  
  /**
   * @author <a href="mailto:shuo.qius@alibaba-inc.com">QIU Shuo</a>
   */
  public abstract class DMLStatement implements SQLStatement {
      @SuppressWarnings({ "rawtypes", "unchecked" })
      protected static List ensureListType(List list) {
          if (list == null || list.size() <= 0)
              return null;
          if (list instanceof ArrayList)
              return list;
          return new ArrayList(list);
      }
  
      @SuppressWarnings("unchecked")
      protected static List<List<Expression>> checkAndConvertValuesList(List<List<Expression>> valuesList) {
          if (valuesList == null || valuesList.isEmpty()) {
              throw new IllegalArgumentException("argument 'valuesList' is empty");
          }
          List<List<Expression>> rst = (valuesList instanceof ArrayList) ? valuesList : new ArrayList<List<Expression>>(
                  valuesList.size());
          boolean copy = rst != valuesList;
          int size = -1;
          if (copy) {
              for (List<Expression> values : valuesList) {
                  if (values == null || values.size() <= 0) {
                      throw new IllegalArgumentException("argument 'valuesList' contains empty element");
                  }
                  if (size < 0) {
                      size = values.size();
                  } else if (size != values.size()) {
                      throw new IllegalArgumentException(
                              "argument 'valuesList' contains empty elements with different size: " + size + " != "
                                      + values.size());
                  }
                  rst.add(ensureListType(values));
              }
              return rst;
          }
          for (int i = 0; i < valuesList.size(); ++i) {
              List<Expression> values = valuesList.get(i);
              if (values == null || values.size() <= 0) {
                  throw new IllegalArgumentException("argument 'valuesList' contains empty element");
              }
              if (size < 0) {
                  size = values.size();
              } else if (size != values.size()) {
                  throw new IllegalArgumentException(
                          "argument 'valuesList' contains empty elements with different size: " + size + " != "
                                  + values.size());
              }
              if (!(values instanceof ArrayList)) {
                  valuesList.set(i, new ArrayList<Expression>(values));
              }
          }
          return rst;
      }
  
      @Override
      public String toString() {
          StringBuilder sb = new StringBuilder();
          accept(new MySQLOutputASTVisitor(sb));
          return sb.toString();
      }
  }
  