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Added support for the array:head and array:tail Metapath functions. R…
…efactored array construction and handling to allow sequences to be members of an array.
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core/src/main/java/gov/nist/secauto/metaschema/core/metapath/ICollectionValue.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,45 @@ | ||
| /* | ||
| * Portions of this software was developed by employees of the National Institute | ||
| * of Standards and Technology (NIST), an agency of the Federal Government and is | ||
| * being made available as a public service. Pursuant to title 17 United States | ||
| * Code Section 105, works of NIST employees are not subject to copyright | ||
| * protection in the United States. This software may be subject to foreign | ||
| * copyright. Permission in the United States and in foreign countries, to the | ||
| * extent that NIST may hold copyright, to use, copy, modify, create derivative | ||
| * works, and distribute this software and its documentation without fee is hereby | ||
| * granted on a non-exclusive basis, provided that this notice and disclaimer | ||
| * of warranty appears in all copies. | ||
| * | ||
| * THE SOFTWARE IS PROVIDED 'AS IS' WITHOUT ANY WARRANTY OF ANY KIND, EITHER | ||
| * EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, ANY WARRANTY | ||
| * THAT THE SOFTWARE WILL CONFORM TO SPECIFICATIONS, ANY IMPLIED WARRANTIES OF | ||
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND FREEDOM FROM | ||
| * INFRINGEMENT, AND ANY WARRANTY THAT THE DOCUMENTATION WILL CONFORM TO THE | ||
| * SOFTWARE, OR ANY WARRANTY THAT THE SOFTWARE WILL BE ERROR FREE. IN NO EVENT | ||
| * SHALL NIST BE LIABLE FOR ANY DAMAGES, INCLUDING, BUT NOT LIMITED TO, DIRECT, | ||
| * INDIRECT, SPECIAL OR CONSEQUENTIAL DAMAGES, ARISING OUT OF, RESULTING FROM, | ||
| * OR IN ANY WAY CONNECTED WITH THIS SOFTWARE, WHETHER OR NOT BASED UPON WARRANTY, | ||
| * CONTRACT, TORT, OR OTHERWISE, WHETHER OR NOT INJURY WAS SUSTAINED BY PERSONS OR | ||
| * PROPERTY OR OTHERWISE, AND WHETHER OR NOT LOSS WAS SUSTAINED FROM, OR AROSE OUT | ||
| * OF THE RESULTS OF, OR USE OF, THE SOFTWARE OR SERVICES PROVIDED HEREUNDER. | ||
| */ | ||
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| package gov.nist.secauto.metaschema.core.metapath; | ||
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| import gov.nist.secauto.metaschema.core.metapath.item.IItem; | ||
| import gov.nist.secauto.metaschema.core.util.ObjectUtils; | ||
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| import java.util.stream.Stream; | ||
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| import edu.umd.cs.findbugs.annotations.NonNull; | ||
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| public interface ICollectionValue { | ||
| // TODO: rename to toSequence and resolve conflicting methods? | ||
| @NonNull | ||
| ISequence<?> asSequence(); | ||
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| @NonNull | ||
| static Stream<? extends IItem> normalizeAsItems(@NonNull ICollectionValue value) { | ||
| return value instanceof IItem ? ObjectUtils.notNull(Stream.of((IItem) value)) : value.asSequence().stream(); | ||
| } | ||
| } |
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86 changes: 86 additions & 0 deletions
86
core/src/main/java/gov/nist/secauto/metaschema/core/metapath/function/library/ArrayHead.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,86 @@ | ||
| /* | ||
| * Portions of this software was developed by employees of the National Institute | ||
| * of Standards and Technology (NIST), an agency of the Federal Government and is | ||
| * being made available as a public service. Pursuant to title 17 United States | ||
| * Code Section 105, works of NIST employees are not subject to copyright | ||
| * protection in the United States. This software may be subject to foreign | ||
| * copyright. Permission in the United States and in foreign countries, to the | ||
| * extent that NIST may hold copyright, to use, copy, modify, create derivative | ||
| * works, and distribute this software and its documentation without fee is hereby | ||
| * granted on a non-exclusive basis, provided that this notice and disclaimer | ||
| * of warranty appears in all copies. | ||
| * | ||
| * THE SOFTWARE IS PROVIDED 'AS IS' WITHOUT ANY WARRANTY OF ANY KIND, EITHER | ||
| * EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, ANY WARRANTY | ||
| * THAT THE SOFTWARE WILL CONFORM TO SPECIFICATIONS, ANY IMPLIED WARRANTIES OF | ||
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND FREEDOM FROM | ||
| * INFRINGEMENT, AND ANY WARRANTY THAT THE DOCUMENTATION WILL CONFORM TO THE | ||
| * SOFTWARE, OR ANY WARRANTY THAT THE SOFTWARE WILL BE ERROR FREE. IN NO EVENT | ||
| * SHALL NIST BE LIABLE FOR ANY DAMAGES, INCLUDING, BUT NOT LIMITED TO, DIRECT, | ||
| * INDIRECT, SPECIAL OR CONSEQUENTIAL DAMAGES, ARISING OUT OF, RESULTING FROM, | ||
| * OR IN ANY WAY CONNECTED WITH THIS SOFTWARE, WHETHER OR NOT BASED UPON WARRANTY, | ||
| * CONTRACT, TORT, OR OTHERWISE, WHETHER OR NOT INJURY WAS SUSTAINED BY PERSONS OR | ||
| * PROPERTY OR OTHERWISE, AND WHETHER OR NOT LOSS WAS SUSTAINED FROM, OR AROSE OUT | ||
| * OF THE RESULTS OF, OR USE OF, THE SOFTWARE OR SERVICES PROVIDED HEREUNDER. | ||
| */ | ||
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| package gov.nist.secauto.metaschema.core.metapath.function.library; | ||
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| import gov.nist.secauto.metaschema.core.metapath.DynamicContext; | ||
| import gov.nist.secauto.metaschema.core.metapath.ICollectionValue; | ||
| import gov.nist.secauto.metaschema.core.metapath.ISequence; | ||
| import gov.nist.secauto.metaschema.core.metapath.MetapathConstants; | ||
| import gov.nist.secauto.metaschema.core.metapath.function.FunctionUtils; | ||
| import gov.nist.secauto.metaschema.core.metapath.function.IArgument; | ||
| import gov.nist.secauto.metaschema.core.metapath.function.IFunction; | ||
| import gov.nist.secauto.metaschema.core.metapath.item.IItem; | ||
| import gov.nist.secauto.metaschema.core.metapath.item.function.IArrayItem; | ||
| import gov.nist.secauto.metaschema.core.util.ObjectUtils; | ||
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| import java.util.List; | ||
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| import edu.umd.cs.findbugs.annotations.NonNull; | ||
| import edu.umd.cs.findbugs.annotations.Nullable; | ||
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| public class ArrayHead { | ||
| @NonNull | ||
| static final IFunction SIGNATURE = IFunction.builder() | ||
| .name("head") | ||
| .namespace(MetapathConstants.NS_METAPATH_FUNCTIONS_ARRAY) | ||
| .argument(IArgument.builder() | ||
| .name("array") | ||
| .type(IArrayItem.class) | ||
| .one() | ||
| .build()) | ||
| .returnType(IItem.class) | ||
| .returnZeroOrOne() | ||
| .functionHandler(ArrayHead::execute) | ||
| .build(); | ||
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| @SuppressWarnings("unused") | ||
| @NonNull | ||
| private static ISequence<?> execute(@NonNull IFunction function, | ||
| @NonNull List<ISequence<?>> arguments, | ||
| @NonNull DynamicContext dynamicContext, | ||
| IItem focus) { | ||
| IArrayItem<?> array = FunctionUtils.asType(ObjectUtils.requireNonNull(arguments.get(0).getFirstItem(true))); | ||
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| ICollectionValue result = head(array); | ||
| return result == null ? ISequence.empty() : result.asSequence(); | ||
| } | ||
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| /** | ||
| * An implementation of XPath 3.1 <a href= | ||
| * "https://www.w3.org/TR/xpath-functions-31/#func-array-head">array:head</a>. | ||
| * | ||
| * @param <T> | ||
| * the type of items in the given Metapath array | ||
| * @param array | ||
| * the array to get the head item from | ||
| * @return the head item | ||
| */ | ||
| @Nullable | ||
| public static <T extends ICollectionValue> T head(@NonNull IArrayItem<T> array) { | ||
| return array.isEmpty() ? null : array.get(0); | ||
| } | ||
| } |
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