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.ItemUtils;
30 import gov.nist.secauto.metaschema.core.metapath.item.node.IFlagNodeItem;
31 import gov.nist.secauto.metaschema.core.metapath.item.node.INodeItem;
32
33 import java.util.stream.Stream;
34
35 import edu.umd.cs.findbugs.annotations.NonNull;
36
37 class Flag // NOPMD - intentional name
38 extends AbstractNamedInstanceExpression<IFlagNodeItem> {
39
40 /**
41 * Construct a new expression that finds any child {@link IFlagNodeItem} that
42 * matches the provided {@code test}.
43 *
44 * @param test
45 * the test to use to match
46 */
47 protected Flag(@NonNull IExpression test) {
48 super(test);
49 }
50
51 @Override
52 public Class<IFlagNodeItem> getBaseResultType() {
53 return IFlagNodeItem.class;
54 }
55
56 @Override
57 public <RESULT, CONTEXT> RESULT accept(IExpressionVisitor<RESULT, CONTEXT> visitor, CONTEXT context) {
58 return visitor.visitFlag(this, context);
59 }
60
61 @Override
62 public ISequence<? extends IFlagNodeItem> accept(
63 DynamicContext dynamicContext,
64 ISequence<?> focus) {
65 return ISequence.of(focus.asStream()
66 .map(item -> ItemUtils.checkItemIsNodeItemForStep(item))
67 .flatMap(item -> {
68 assert item != null;
69 return match(item);
70 }));
71 }
72
73 /**
74 * Get a stream of matching child node items for the provided {@code context}.
75 *
76 * @param focusedItem
77 * the node item to match child items of
78 * @return the stream of matching node items
79 */
80 @SuppressWarnings("null")
81 @NonNull
82 protected Stream<? extends IFlagNodeItem> match(@NonNull INodeItem focusedItem) {
83 Stream<? extends IFlagNodeItem> retval;
84 if (getTest() instanceof Name) {
85 String name = ((Name) getTest()).getValue();
86
87 IFlagNodeItem item = focusedItem.getFlagByName(name);
88 retval = item == null ? Stream.empty() : Stream.of(item);
89 } else {
90 // wildcard
91 retval = focusedItem.flags();
92 }
93 return retval;
94 }
95 }