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 2011-8-4)
   */
  package com.alibaba.cobar.route.hint;
  
  import java.sql.SQLSyntaxErrorException;
  
  import com.alibaba.cobar.parser.util.Pair;
  import com.alibaba.cobar.route.RouteResultsetNode;
  
  /**
   * @author <a href="mailto:shuo.qius@alibaba-inc.com">QIU Shuo</a>
   */
  public final class DataNodeHintParser extends HintParser {
  
      @Override
      public void process(CobarHint hint, String hintName, String sql) throws SQLSyntaxErrorException {
          if (currentChar(hint, sql) == '[') {
              for (;;) {
                  nextChar(hint, sql);
                  Pair<Integer, Integer> pair = parseDataNode(hint, sql);
                  hint.addDataNode(pair.getKey(), pair.getValue());
                  switch (currentChar(hint, sql)) {
                  case ',':
                      continue;
                  case ']':
                      nextChar(hint, sql);
                      return;
                  default:
                      throw new SQLSyntaxErrorException("err for dataNodeId: " + sql);
                  }
              }
          } else {
              Pair<Integer, Integer> pair = parseDataNode(hint, sql);
              hint.addDataNode(pair.getKey(), pair.getValue());
          }
      }
  
      /**
       * first char is not separator
       */
      private Pair<Integer, Integer> parseDataNode(CobarHint hint, String sql) {
          int start = hint.getCurrentIndex();
          int ci = start;
          for (; isDigit(sql.charAt(ci)); ++ci) {
          }
          Integer nodeIndex = Integer.parseInt(sql.substring(start, ci));
          Integer replica = RouteResultsetNode.DEFAULT_REPLICA_INDEX;
          hint.setCurrentIndex(ci);
          if (currentChar(hint, sql) == '.') {
              nextChar(hint, sql);
              start = hint.getCurrentIndex();
              ci = start;
              for (; isDigit(sql.charAt(ci)); ++ci) {
              }
              replica = Integer.parseInt(sql.substring(start, ci));
              hint.setCurrentIndex(ci);
          }
          return new Pair<Integer, Integer>(nodeIndex, replica);
      }
  }
  