GeneralComparison.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
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* 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
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* 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,
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package gov.nist.secauto.metaschema.core.metapath;
import gov.nist.secauto.metaschema.core.metapath.function.library.FnData;
import gov.nist.secauto.metaschema.core.metapath.item.atomic.IAnyAtomicItem;
import gov.nist.secauto.metaschema.core.metapath.item.atomic.IBooleanItem;
import gov.nist.secauto.metaschema.core.metapath.item.atomic.IDayTimeDurationItem;
import gov.nist.secauto.metaschema.core.metapath.item.atomic.IDecimalItem;
import gov.nist.secauto.metaschema.core.metapath.item.atomic.INumericItem;
import gov.nist.secauto.metaschema.core.metapath.item.atomic.IStringItem;
import gov.nist.secauto.metaschema.core.metapath.item.atomic.IUntypedAtomicItem;
import gov.nist.secauto.metaschema.core.metapath.item.atomic.IYearMonthDurationItem;
import edu.umd.cs.findbugs.annotations.NonNull;
class GeneralComparison
extends AbstractComparison {
/**
* Create a new value comparison expression.
*
* @param left
* the expression to compare against
* @param operator
* the comparison operator
* @param right
* the expression to compare with
*/
protected GeneralComparison(@NonNull IExpression left, @NonNull Operator operator, @NonNull IExpression right) {
super(left, operator, right);
}
@Override
public <RESULT, CONTEXT> RESULT accept(IExpressionVisitor<RESULT, CONTEXT> visitor, CONTEXT context) {
return visitor.visitGeneralComparison(this, context);
}
@Override
public ISequence<? extends IBooleanItem> accept(DynamicContext dynamicContext, ISequence<?> focus) {
ISequence<? extends IAnyAtomicItem> leftItems = FnData.fnData(getLeft().accept(dynamicContext, focus));
ISequence<? extends IAnyAtomicItem> rightItems = FnData.fnData(getRight().accept(dynamicContext, focus));
return ISequence.of(valueCompairison(leftItems, getOperator(), rightItems));
}
/**
* Compare the sets of atomic items.
*
* @param leftItems
* the first set of items to compare
* @param operator
* the comparison operator
* @param rightItems
* the second set of items to compare
* @return a or an empty {@link ISequence} if either item is {@code null}
*/
@NonNull
protected IBooleanItem valueCompairison( // NOPMD - acceptable complexity
@NonNull ISequence<? extends IAnyAtomicItem> leftItems,
@NonNull Operator operator,
@NonNull ISequence<? extends IAnyAtomicItem> rightItems) {
IBooleanItem retval = IBooleanItem.FALSE;
for (IAnyAtomicItem left : leftItems.asList()) {
assert left != null;
for (IAnyAtomicItem right : rightItems.asList()) {
assert right != null;
IAnyAtomicItem leftCast;
IAnyAtomicItem rightCast;
if (left instanceof IUntypedAtomicItem) {
if (right instanceof IUntypedAtomicItem) {
leftCast = IStringItem.cast(left);
rightCast = IStringItem.cast(right);
} else {
leftCast = applyGeneralComparisonCast(right, left);
rightCast = right;
}
} else if (right instanceof IUntypedAtomicItem) {
leftCast = left;
rightCast = applyGeneralComparisonCast(left, right);
} else {
leftCast = left;
rightCast = right;
}
assert leftCast != null;
IBooleanItem result = compare(leftCast, operator, rightCast);
if (IBooleanItem.TRUE.equals(result)) {
retval = IBooleanItem.TRUE;
}
}
}
return retval;
}
/**
* Attempts to cast the provided {@code other} item to the type of the
* {@code item}.
*
* @param item
* the item whose type the other item is to be cast to
* @param other
* the item to cast
* @return the casted item
*/
@NonNull
protected IAnyAtomicItem applyGeneralComparisonCast(@NonNull IAnyAtomicItem item, @NonNull IAnyAtomicItem other) {
IAnyAtomicItem retval;
if (item instanceof INumericItem) {
retval = IDecimalItem.cast(other);
} else if (item instanceof IDayTimeDurationItem) {
retval = IDayTimeDurationItem.cast(other);
} else if (item instanceof IDayTimeDurationItem) {
retval = IYearMonthDurationItem.cast(other);
} else {
retval = item.getJavaTypeAdapter().cast(other);
}
return retval;
}
}