IsStringSetEqual.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.swid.swidval.services;
import net.sf.saxon.expr.XPathContext;
import net.sf.saxon.lib.ExtensionFunctionCall;
import net.sf.saxon.lib.ExtensionFunctionDefinition;
import net.sf.saxon.om.Sequence;
import net.sf.saxon.om.StructuredQName;
import net.sf.saxon.trans.XPathException;
import net.sf.saxon.value.BooleanValue;
import net.sf.saxon.value.SequenceType;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.Set;
public class IsStringSetEqual extends ExtensionFunctionDefinition {
private static final StructuredQName FUNCTION_QNAME
= new StructuredQName("java-swid", "java:gov.nist.secauto.swid.swidval.schematron", "isStringSetEqual");
private static final SequenceType[] FUNCTION_ARGUMENTS
= new SequenceType[] { SequenceType.STRING_SEQUENCE, SequenceType.STRING_SEQUENCE, SequenceType.OPTIONAL_STRING };
@Override
public StructuredQName getFunctionQName() {
return FUNCTION_QNAME;
}
@Override
public SequenceType[] getArgumentTypes() {
return FUNCTION_ARGUMENTS;
}
@Override
public SequenceType getResultType(SequenceType[] suppliedArgumentTypes) {
return SequenceType.SINGLE_BOOLEAN;
}
@Override
public ExtensionFunctionCall makeCallExpression() {
return new FunctionCall();
}
private static class FunctionCall extends ExtensionFunctionCall {
@Override
public Sequence call(XPathContext context, Sequence[] arguments) throws XPathException {
String left = arguments[0].head().getStringValue();
String right = arguments[1].head().getStringValue();
String pattern;
if (arguments.length == 3) {
pattern = arguments[2].head().getStringValue();
} else {
pattern = "\\s+";
}
Set<String> leftSet = parseSet(left, pattern);
Set<String> rightSet = parseSet(right, pattern);
boolean retval = leftSet.equals(rightSet);
return BooleanValue.get(retval);
}
private Set<String> parseSet(String str, String pattern) {
Set<String> retval = new LinkedHashSet<>();
for (String s : str.split(pattern)) {
retval.add(s);
}
return Collections.unmodifiableSet(retval);
}
}
}