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.function.FunctionUtils;
30 import gov.nist.secauto.metaschema.core.metapath.function.OperationFunctions;
31 import gov.nist.secauto.metaschema.core.metapath.item.atomic.INumericItem;
32
33 import java.util.List;
34
35 import edu.umd.cs.findbugs.annotations.NonNull;
36
37 class Negate
38 extends AbstractUnaryExpression {
39
40 @NonNull
41 private final Class<? extends INumericItem> staticResultType;
42
43 /**
44 * Create an expression that gets the complement of a number.
45 *
46 * @param expr
47 * the expression whose item result will be complemented
48 */
49 @SuppressWarnings("null")
50 protected Negate(@NonNull IExpression expr) {
51 super(expr);
52 this.staticResultType = ExpressionUtils.analyzeStaticResultType(INumericItem.class, List.of(expr));
53 }
54
55 @Override
56 public Class<INumericItem> getBaseResultType() {
57 return INumericItem.class;
58 }
59
60 @Override
61 public Class<? extends INumericItem> getStaticResultType() {
62 return staticResultType;
63 }
64
65 @Override
66 public <RESULT, CONTEXT> RESULT accept(IExpressionVisitor<RESULT, CONTEXT> visitor, CONTEXT context) {
67 return visitor.visitNegate(this, context);
68 }
69
70 @Override
71 public ISequence<? extends INumericItem> accept(DynamicContext dynamicContext, ISequence<?> focus) {
72 INumericItem item = FunctionUtils.toNumericOrNull(
73 getFirstDataItem(getChild().accept(dynamicContext, focus), true));
74 if (item != null) {
75 item = OperationFunctions.opNumericUnaryMinus(item);
76 }
77 return ISequence.of(item);
78 }
79 }