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.dialect.oracle.parser;
  
  import com.alibaba.druid.sql.ast.SQLExpr;
  import com.alibaba.druid.sql.ast.statement.SQLTableSource;
  import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleUpdateStatement;
  import com.alibaba.druid.sql.parser.Lexer;
  import com.alibaba.druid.sql.parser.ParserException;
  import com.alibaba.druid.sql.parser.SQLStatementParser;
  import com.alibaba.druid.sql.parser.Token;
  
  public class OracleUpdateParser extends SQLStatementParser {
      public OracleUpdateParser(String sql) {
          super(new OracleExprParser(sql));
      }
  
      public OracleUpdateParser(Lexer lexer) {
          super(new OracleExprParser(lexer));
      }
  
      public OracleUpdateStatement parseUpdateStatement() {
          OracleUpdateStatement update = new OracleUpdateStatement();
  
          if (lexer.token() == Token.UPDATE) {
              lexer.nextToken();
  
              parseHints(update);
  
              if (lexer.identifierEquals("ONLY")) {
                  update.setOnly(true);
              }
  
              SQLTableSource tableSource = this.exprParser.createSelectParser().parseTableSource();
              update.setTableSource(tableSource);
  
              if ((update.getAlias() == null) || (update.getAlias().length() == 0)) {
                  update.setAlias(tableAlias());
              }
          }
  
          parseUpdateSet(update);
  
          parseWhere(update);
  
          parseReturn(update);
  
          parseErrorLoging(update);
  
          return update;
      }
  
      private void parseErrorLoging(OracleUpdateStatement update) {
          if (lexer.identifierEquals("LOG")) {
              throw new ParserException("TODO. " + lexer.info());
          }
      }
  
      private void parseReturn(OracleUpdateStatement update) {
          if (lexer.token() == Token.RETURN || lexer.token() == Token.RETURNING) {
              lexer.nextToken();
  
              for (; ; ) {
                  SQLExpr item = this.exprParser.expr();
                  update.getReturning().add(item);
  
                  if (lexer.token() == Token.COMMA) {
                      lexer.nextToken();
                      continue;
                  }
  
                  break;
              }
  
              accept(Token.INTO);
  
              for (; ; ) {
                  SQLExpr item = this.exprParser.expr();
                  update.addReturningInto(item);
  
                  if (lexer.token() == Token.COMMA) {
                      lexer.nextToken();
                      continue;
                  }
  
                  break;
              }
          }
      }
  
      private void parseHints(OracleUpdateStatement update) {
          this.exprParser.parseHints(update.getHints());
      }
  
      private void parseWhere(OracleUpdateStatement update) {
          if (lexer.token() == (Token.WHERE)) {
              lexer.nextToken();
              update.setWhere(this.exprParser.expr());
          }
      }
  
  }
  