FnBaseUri.java
/*
* 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.
*/
package gov.nist.secauto.metaschema.core.metapath.function.library;
import gov.nist.secauto.metaschema.core.metapath.DynamicContext;
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.atomic.IAnyUriItem;
import gov.nist.secauto.metaschema.core.metapath.item.node.INodeItem;
import gov.nist.secauto.metaschema.core.util.ObjectUtils;
import java.net.URI;
import java.util.List;
import edu.umd.cs.findbugs.annotations.NonNull;
import edu.umd.cs.findbugs.annotations.Nullable;
/**
* Since a node doesn't have a base URI in Metaschema, this is an alias for the
* document-uri function.
*/
public final class FnBaseUri {
@NonNull
static final IFunction SIGNATURE_NO_ARG = IFunction.builder()
.name("base-uri")
.namespace(MetapathConstants.NS_XPATH_FUNCTIONS)
.deterministic()
.contextDependent()
.focusDependent()
.returnType(IAnyUriItem.class)
.returnOne()
.functionHandler(FnBaseUri::executeNoArg)
.build();
@NonNull
static final IFunction SIGNATURE_ONE_ARG = IFunction.builder()
.name("base-uri")
.namespace(MetapathConstants.NS_XPATH_FUNCTIONS)
.deterministic()
.contextIndependent()
.focusIndependent()
.argument(IArgument.newBuilder()
.name("arg1")
.type(INodeItem.class)
.zeroOrOne()
.build())
.returnType(IAnyUriItem.class)
.returnOne()
.functionHandler(FnBaseUri::executeOneArg)
.build();
private FnBaseUri() {
// disable construction
}
@SuppressWarnings("unused")
@NonNull
private static ISequence<IAnyUriItem> executeNoArg(@NonNull IFunction function,
@NonNull List<ISequence<?>> arguments,
@NonNull DynamicContext dynamicContext,
IItem focus) {
return ISequence.of(fnBaseUri(
FunctionUtils.requireTypeOrNull(INodeItem.class, focus)));
}
@SuppressWarnings("unused")
@NonNull
private static ISequence<IAnyUriItem> executeOneArg(@NonNull IFunction function,
@NonNull List<ISequence<?>> arguments,
@NonNull DynamicContext dynamicContext,
IItem focus) {
ISequence<? extends INodeItem> arg = FunctionUtils.asType(ObjectUtils.requireNonNull(arguments.get(0)));
INodeItem item = FunctionUtils.getFirstItem(arg, true);
return ISequence.of(fnBaseUri(item));
}
/**
* Get the base URI for the provided {@code nodeItem}.
* <p>
* Based on the XPath 3.1 <a href=
* "https://www.w3.org/TR/xpath-functions-31/#func-base-uri">fn:base-uri</a>
* function.
*
* @param nodeItem
* the node to get the base URI from
* @return the base URI, or {@code null} if the node is either null or doesn't
* have a base URI
*/
@SuppressWarnings("PMD.NullAssignment") // for readability
@Nullable
public static IAnyUriItem fnBaseUri(INodeItem nodeItem) {
IAnyUriItem retval;
if (nodeItem == null) {
retval = null; // NOPMD - intentional
} else {
URI baseUri = nodeItem.getBaseUri();
retval = baseUri == null ? null : IAnyUriItem.valueOf(baseUri);
}
return retval;
}
}