/*
* Copyright 1999-2011 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.expr.SQLListExpr;
import com.alibaba.druid.sql.ast.statement.SQLTableSource;
import com.alibaba.druid.sql.ast.statement.SQLUpdateSetItem;
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.SQLExprParser;
import com.alibaba.druid.sql.parser.SQLStatementParser;
import com.alibaba.druid.sql.parser.Token;
public class OracleUpdateParser extends SQLStatementParser {
public OracleUpdateParser(String sql) throws ParserException{
super(sql);
}
public OracleUpdateParser(Lexer lexer){
super(lexer);
}
public OracleUpdateStatement parseUpdateStatement() throws ParserException {
OracleUpdateStatement update = new OracleUpdateStatement();
if (lexer.token() == Token.UPDATE) {
lexer.nextToken();
parseHints(update);
if (identifierEquals("ONLY")) {
update.setOnly(true);
}
SQLTableSource tableSource = this.exprParser.createSelectParser().parseTableSource();
update.setTableSource(tableSource);
if ((update.getAlias() == null) || (update.getAlias().length() == 0)) {
update.setAlias(as());
}
}
parseSet(update);
parseWhere(update);
parseReturn(update);
parseErrorLoging(update);
return update;
}
private void parseErrorLoging(OracleUpdateStatement update) throws ParserException {
if (identifierEquals("LOG")) throw new ParserException("TODO");
}
private void parseReturn(OracleUpdateStatement update) throws ParserException {
if (identifierEquals("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.getReturningInto().add(item);
if (lexer.token() == Token.COMMA) {
lexer.nextToken();
continue;
}
break;
}
}
}
private void parseHints(OracleUpdateStatement update) throws ParserException {
if (lexer.token() == Token.HINT) {
throw new ParserException("TODO");
}
}
private void parseWhere(OracleUpdateStatement update) throws ParserException {
if (lexer.token() == (Token.WHERE)) {
lexer.nextToken();
update.setWhere(this.exprParser.expr());
}
}
private void parseSet(OracleUpdateStatement update) throws ParserException {
accept(Token.SET);
for (;;) {
SQLUpdateSetItem item = new SQLUpdateSetItem();
if (lexer.token() == (Token.LPAREN)) {
lexer.nextToken();
SQLListExpr list = new SQLListExpr();
this.exprParser.exprList(list.getItems());
accept(Token.RPAREN);
item.setColumn(list);
} else {
item.setColumn(this.exprParser.primary());
}
accept(Token.EQ);
item.setValue(this.exprParser.expr());
update.getItems().add(item);
if (lexer.token() != Token.COMMA) {
break;
}
lexer.nextToken();
}
}
protected SQLExprParser createExprParser() {
return new OracleExprParser(lexer);
}
}