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.INumericItem;
038import gov.nist.secauto.metaschema.core.util.ObjectUtils;
039
040import java.util.List;
041
042import edu.umd.cs.findbugs.annotations.NonNull;
043
044public final class FnRound {
045  private static final String NAME = "round";
046
047  @NonNull
048  static final IFunction SIGNATURE = NumericFunction.signature(
049      MetapathConstants.NS_XPATH_FUNCTIONS,
050      NAME,
051      INumericItem::round);
052
053  @NonNull
054  static final IFunction SIGNATURE_WITH_PRECISION = IFunction.builder()
055      .name(NAME)
056      .namespace(MetapathConstants.NS_XPATH_FUNCTIONS)
057      .argument(IArgument.newBuilder()
058          .name("arg1")
059          .type(INumericItem.class)
060          .zeroOrOne()
061          .build())
062      .argument(IArgument.newBuilder()
063          .name("precision")
064          .type(IIntegerItem.class)
065          .one()
066          .build())
067      .returnType(INumericItem.class)
068      .returnZeroOrOne()
069      .functionHandler(FnRound::executeTwoArg)
070      .build();
071
072  private FnRound() {
073    // disable construction
074  }
075
076  @SuppressWarnings("unused")
077  @NonNull
078  private static ISequence<INumericItem> executeTwoArg(
079      @NonNull IFunction function,
080      @NonNull List<ISequence<?>> arguments,
081      @NonNull DynamicContext dynamicContext,
082      IItem focus) {
083    ISequence<? extends INumericItem> sequence = FunctionUtils.asType(
084        ObjectUtils.requireNonNull(arguments.get(0)));
085    if (sequence.isEmpty()) {
086      return ISequence.empty(); // NOPMD - readability
087    }
088
089    INumericItem item = FunctionUtils.getFirstItem(sequence, true);
090    if (item == null) {
091      return ISequence.empty(); // NOPMD - readability
092    }
093
094    @NonNull IIntegerItem precision = FunctionUtils.asType(
095        FunctionUtils.requireFirstItem(
096            ObjectUtils.requireNonNull(arguments.get(1)),
097            true));
098
099    INumericItem result = item.round(precision);
100    return ISequence.of(result);
101  }
102}