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.IItem;
30 import gov.nist.secauto.metaschema.core.util.ObjectUtils;
31
32 import java.util.List;
33
34 import edu.umd.cs.findbugs.annotations.NonNull;
35
36 class Let implements IExpression { // NOPMD class name ok
37 @NonNull
38 private final Name name;
39 @NonNull
40 private final IExpression boundExpression;
41 @NonNull
42 private final IExpression returnExpression;
43
44 public Let(@NonNull Name name, @NonNull IExpression boundExpression, @NonNull IExpression returnExpression) {
45 super();
46 this.name = name;
47 this.boundExpression = boundExpression;
48 this.returnExpression = returnExpression;
49 }
50
51 @NonNull
52 public Name getName() {
53 return name;
54 }
55
56 @NonNull
57 public IExpression getBoundExpression() {
58 return boundExpression;
59 }
60
61 @NonNull
62 public IExpression getReturnExpression() {
63 return returnExpression;
64 }
65
66 @Override
67 public List<? extends IExpression> getChildren() {
68 return ObjectUtils.notNull(
69 List.of(boundExpression, returnExpression));
70 }
71
72 @Override
73 public <RESULT, CONTEXT> RESULT accept(IExpressionVisitor<RESULT, CONTEXT> visitor, CONTEXT context) {
74 return visitor.visitLet(this, context);
75 }
76
77 @Override
78 public ISequence<? extends IItem> accept(DynamicContext dynamicContext, ISequence<?> focus) {
79 ISequence<?> result = getBoundExpression().accept(dynamicContext, focus);
80
81 String name = getName().getValue();
82 dynamicContext.setVariableValue(name, result);
83
84 ISequence<?> retval = getReturnExpression().accept(dynamicContext, focus);
85
86 dynamicContext.clearVariableValue(name);
87
88 return retval;
89 }
90 }