QueryParserUtils


1   /*
2    * Copyright 2004 Outerthought bvba and Schaubroeck nv
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *     http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  package org.outerj.daisy.query;
17  
18  /**
19   * Utility code for the QueryParser, easier to write here then embedded
20   * in the grammer.
21   */
22  final class QueryParserUtils {
23      /**
24       * @param literal a text literal within single quotes, within which single quotes
25       *                are escaped by using them double.
26       */
27      public static final String   unEscapeStringLiteral(final String   literal) {
28          StringBuffer   result = new StringBuffer  (literal.length());
29          boolean inSingleQuote = false;
30          for (int i = 1; i < literal.length() - 1; i++) {
31              char c = literal.charAt(i);
32              switch (c) {
33                  case '\'':
34                      if (inSingleQuote) {
35                          inSingleQuote = false;
36                          result.append(c);
37                      } else {
38                          inSingleQuote = true;
39                      }
40                      break;
41                  default:
42                      result.append(c);
43              }
44          }
45          return result.toString();
46      }
47  }
48
A to Z: JavaDoc & Examples Daily Java News & Articles Open Source Projects Open Source Codes Free Computer Books Remove Frame
Popular Tags