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.IModelNodeItem; 31 import gov.nist.secauto.metaschema.core.metapath.item.node.INodeItem; 32 33 import java.util.List; 34 import java.util.stream.Stream; 35 36 import edu.umd.cs.findbugs.annotations.NonNull; 37 38 @SuppressWarnings("rawtypes") 39 class ModelInstance 40 extends AbstractNamedInstanceExpression<IModelNodeItem> { 41 42 /** 43 * Construct a new expression that finds any child {@link IModelNodeItem} that 44 * matches the provided {@code test}. 45 * 46 * @param test 47 * the test to use to match 48 */ 49 protected ModelInstance(@NonNull IExpression test) { 50 super(test); 51 } 52 53 @Override 54 public Class<IModelNodeItem> getBaseResultType() { 55 return IModelNodeItem.class; 56 } 57 58 @Override 59 public <RESULT, CONTEXT> RESULT accept(IExpressionVisitor<RESULT, CONTEXT> visitor, CONTEXT context) { 60 return visitor.visitModelInstance(this, context); 61 } 62 63 @Override 64 public ISequence<? extends IModelNodeItem<?, ?>> accept( 65 DynamicContext dynamicContext, 66 ISequence<?> focus) { 67 return ISequence.of(focus.asStream() 68 .map(item -> ItemUtils.checkItemIsNodeItemForStep(item)) 69 .flatMap(item -> { 70 assert item != null; 71 return match(item); 72 })); 73 } 74 75 /** 76 * Get a stream of matching child node items for the provided {@code context}. 77 * 78 * @param focusedItem 79 * the node item to match child items of 80 * @return the stream of matching node items 81 */ 82 @SuppressWarnings("null") 83 @NonNull 84 protected Stream<? extends IModelNodeItem<?, ?>> match( 85 @NonNull INodeItem focusedItem) { 86 Stream<? extends IModelNodeItem<?, ?>> retval; 87 if (getTest() instanceof Name) { 88 String name = ((Name) getTest()).getValue(); 89 List<? extends IModelNodeItem<?, ?>> items = focusedItem.getModelItemsByName(name); 90 retval = items.stream(); 91 } else { 92 // wildcard 93 retval = focusedItem.modelItems(); 94 } 95 return retval; 96 } 97 }