1 /*
2 * Portions of this software was developed by employees of the National Institute
3 * of Standards and Technology (NIST), an agency of the Federal Government and is
4 * being made available as a public service. Pursuant to title 17 United States
5 * Code Section 105, works of NIST employees are not subject to copyright
6 * protection in the United States. This software may be subject to foreign
7 * copyright. Permission in the United States and in foreign countries, to the
8 * extent that NIST may hold copyright, to use, copy, modify, create derivative
9 * works, and distribute this software and its documentation without fee is hereby
10 * granted on a non-exclusive basis, provided that this notice and disclaimer
11 * of warranty appears in all copies.
12 *
13 * THE SOFTWARE IS PROVIDED 'AS IS' WITHOUT ANY WARRANTY OF ANY KIND, EITHER
14 * EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, ANY WARRANTY
15 * THAT THE SOFTWARE WILL CONFORM TO SPECIFICATIONS, ANY IMPLIED WARRANTIES OF
16 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND FREEDOM FROM
17 * INFRINGEMENT, AND ANY WARRANTY THAT THE DOCUMENTATION WILL CONFORM TO THE
18 * SOFTWARE, OR ANY WARRANTY THAT THE SOFTWARE WILL BE ERROR FREE. IN NO EVENT
19 * SHALL NIST BE LIABLE FOR ANY DAMAGES, INCLUDING, BUT NOT LIMITED TO, DIRECT,
20 * INDIRECT, SPECIAL OR CONSEQUENTIAL DAMAGES, ARISING OUT OF, RESULTING FROM,
21 * OR IN ANY WAY CONNECTED WITH THIS SOFTWARE, WHETHER OR NOT BASED UPON WARRANTY,
22 * CONTRACT, TORT, OR OTHERWISE, WHETHER OR NOT INJURY WAS SUSTAINED BY PERSONS OR
23 * PROPERTY OR OTHERWISE, AND WHETHER OR NOT LOSS WAS SUSTAINED FROM, OR AROSE OUT
24 * OF THE RESULTS OF, OR USE OF, THE SOFTWARE OR SERVICES PROVIDED HEREUNDER.
25 */
26
27 package gov.nist.secauto.metaschema.core.metapath;
28
29 import gov.nist.secauto.metaschema.core.metapath.item.atomic.IStringItem;
30
31 import java.util.regex.Matcher;
32 import java.util.regex.Pattern;
33
34 import edu.umd.cs.findbugs.annotations.NonNull;
35
36 class StringLiteral
37 extends AbstractLiteralExpression<IStringItem, String> {
38
39 private static final Pattern QUOTE_PATTERN = Pattern.compile("^'(.*)'$|^\"(.*)\"$");
40
41 /**
42 * Construct a new expression that always returns the same string value.
43 *
44 * @param value
45 * the literal value
46 */
47 protected StringLiteral(@NonNull String value) {
48 super(removeQuotes(value));
49 }
50
51 @Override
52 public Class<IStringItem> getBaseResultType() {
53 return IStringItem.class;
54 }
55
56 @SuppressWarnings("null")
57 @NonNull
58 private static String removeQuotes(@NonNull String value) {
59 Matcher matcher = QUOTE_PATTERN.matcher(value);
60
61 String retval = value;
62 if (matcher.matches()) {
63 if (matcher.group(1) != null) {
64 retval = matcher.group(1);
65 } else if (matcher.group(2) != null) {
66 retval = matcher.group(2);
67 }
68 }
69 return retval;
70 }
71
72 @Override
73 public <RESULT, CONTEXT> RESULT accept(IExpressionVisitor<RESULT, CONTEXT> visitor, CONTEXT context) {
74 return visitor.visitStringLiteral(this, context);
75 }
76
77 @Override
78 public ISequence<? extends IStringItem> accept(DynamicContext dynamicContext, ISequence<?> focus) {
79 return ISequence.of(IStringItem.valueOf(getValue()));
80 }
81 }