001/* 002 * Portions of this software was developed by employees of the National Institute 003 * of Standards and Technology (NIST), an agency of the Federal Government and is 004 * being made available as a public service. Pursuant to title 17 United States 005 * Code Section 105, works of NIST employees are not subject to copyright 006 * protection in the United States. This software may be subject to foreign 007 * copyright. Permission in the United States and in foreign countries, to the 008 * extent that NIST may hold copyright, to use, copy, modify, create derivative 009 * works, and distribute this software and its documentation without fee is hereby 010 * granted on a non-exclusive basis, provided that this notice and disclaimer 011 * of warranty appears in all copies. 012 * 013 * THE SOFTWARE IS PROVIDED 'AS IS' WITHOUT ANY WARRANTY OF ANY KIND, EITHER 014 * EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, ANY WARRANTY 015 * THAT THE SOFTWARE WILL CONFORM TO SPECIFICATIONS, ANY IMPLIED WARRANTIES OF 016 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND FREEDOM FROM 017 * INFRINGEMENT, AND ANY WARRANTY THAT THE DOCUMENTATION WILL CONFORM TO THE 018 * SOFTWARE, OR ANY WARRANTY THAT THE SOFTWARE WILL BE ERROR FREE. IN NO EVENT 019 * SHALL NIST BE LIABLE FOR ANY DAMAGES, INCLUDING, BUT NOT LIMITED TO, DIRECT, 020 * INDIRECT, SPECIAL OR CONSEQUENTIAL DAMAGES, ARISING OUT OF, RESULTING FROM, 021 * OR IN ANY WAY CONNECTED WITH THIS SOFTWARE, WHETHER OR NOT BASED UPON WARRANTY, 022 * CONTRACT, TORT, OR OTHERWISE, WHETHER OR NOT INJURY WAS SUSTAINED BY PERSONS OR 023 * PROPERTY OR OTHERWISE, AND WHETHER OR NOT LOSS WAS SUSTAINED FROM, OR AROSE OUT 024 * OF THE RESULTS OF, OR USE OF, THE SOFTWARE OR SERVICES PROVIDED HEREUNDER. 025 */ 026 027package gov.nist.secauto.metaschema.core.metapath.function.library; 028 029import gov.nist.secauto.metaschema.core.metapath.DynamicContext; 030import gov.nist.secauto.metaschema.core.metapath.ISequence; 031import gov.nist.secauto.metaschema.core.metapath.MetapathConstants; 032import gov.nist.secauto.metaschema.core.metapath.function.FunctionUtils; 033import gov.nist.secauto.metaschema.core.metapath.function.IArgument; 034import gov.nist.secauto.metaschema.core.metapath.function.IFunction; 035import gov.nist.secauto.metaschema.core.metapath.item.IItem; 036import gov.nist.secauto.metaschema.core.metapath.item.atomic.IIntegerItem; 037import gov.nist.secauto.metaschema.core.metapath.item.atomic.IStringItem; 038import gov.nist.secauto.metaschema.core.util.ObjectUtils; 039 040import java.util.List; 041 042import edu.umd.cs.findbugs.annotations.NonNull; 043 044public class FnCompare { 045 046 @NonNull 047 static final IFunction SIGNATURE = IFunction.builder() 048 .name("compare") 049 .namespace(MetapathConstants.NS_XPATH_FUNCTIONS) 050 .deterministic() 051 .contextDependent() 052 .focusIndependent() 053 .argument(IArgument.newBuilder() 054 .name("comparand1") 055 .type(IStringItem.class) 056 .zeroOrOne() 057 .build()) 058 .argument(IArgument.newBuilder() 059 .name("comparand2") 060 .type(IStringItem.class) 061 .zeroOrOne() 062 .build()) 063 .returnType(IIntegerItem.class) 064 .returnZeroOrOne() 065 .functionHandler(FnCompare::execute) 066 .build(); 067 068 @SuppressWarnings("unused") 069 @NonNull 070 private static ISequence<IIntegerItem> execute( 071 @NonNull IFunction function, 072 @NonNull List<ISequence<?>> arguments, 073 @NonNull DynamicContext dynamicContext, 074 IItem focus) { 075 IStringItem comparand1 = FunctionUtils.getFirstItem( 076 FunctionUtils.asType(ObjectUtils.requireNonNull(arguments.get(0))), true); 077 078 IStringItem comparand2 = FunctionUtils.getFirstItem( 079 FunctionUtils.asType(ObjectUtils.requireNonNull(arguments.get(1))), true); 080 081 ISequence<IIntegerItem> retval; 082 if (comparand1 == null || comparand2 == null) { 083 retval = ISequence.empty(); 084 } else { 085 IIntegerItem result = comparand1.compare(comparand2); 086 retval = ISequence.of(result); 087 } 088 return retval; 089 } 090}