/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.solr.handler.dataimport;
import static org.apache.solr.handler.dataimport.DataImportHandlerException.SEVERE;
import java.util.List;
/**
* <p> Escapes values in SQL queries. It escapes the value of the given expression
* by replacing all occurrences of single-quotes by two single-quotes and similarily
* for double-quotes </p>
*/
public class SqlEscapingEvaluator extends Evaluator {
@Override
public String evaluate(String expression, Context context) {
List<Object> l = parseParams(expression, context.getVariableResolver());
if (l.size() != 1) {
throw new DataImportHandlerException(SEVERE, "'escapeSql' must have at least one parameter ");
}
String s = l.get(0).toString();
// escape single quote with two single quotes, double quote
// with two doule quotes, and backslash with double backslash.
// See: http://dev.mysql.com/doc/refman/4.1/en/mysql-real-escape-string.html
return s.replaceAll("'", "''").replaceAll("\"", "\"\"").replaceAll("\\\\", "\\\\\\\\");
}
}