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 import java.util.stream.Stream;
34
35 import edu.umd.cs.findbugs.annotations.NonNull;
36
37 class Metapath
38 extends AbstractNAryExpression {
39
40 @NonNull
41 private final Class<? extends IItem> staticResultType;
42
43 /**
44 * Create a new internal metapath expression.
45 *
46 * @param expressions
47 * the expressions to evaluate
48 */
49 public Metapath(@NonNull List<IExpression> expressions) {
50 super(expressions);
51 this.staticResultType = ExpressionUtils.analyzeStaticResultType(IItem.class, expressions);
52 }
53
54 @Override
55 public Class<? extends IItem> getStaticResultType() {
56 return staticResultType;
57 }
58
59 @Override
60 public <RESULT, CONTEXT> RESULT accept(IExpressionVisitor<RESULT, CONTEXT> visitor, CONTEXT context) {
61 return visitor.visitMetapath(this, context);
62 }
63
64 @Override
65 public ISequence<?> accept(DynamicContext dynamicContext, ISequence<?> focus) {
66 Stream<? extends IItem> retval = ObjectUtils.notNull(getChildren().stream()
67 .flatMap(child -> {
68 ISequence<?> result = child.accept(dynamicContext, focus);
69 return result.asStream();
70 }));
71 return ISequence.of(retval);
72 }
73 }