Extract all AQL expressions from a Sirius Desktop VSM

ExtractVSMExpressions.java

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import java.io.IOException;
import java.nio.file.Path;
import java.util.HashSet;
import java.util.Objects;
import java.util.Set;
import java.util.function.Predicate;

public class ExtractVSMExpressions {

    private static class AttributesCollector extends DefaultHandler {
        private final Set<String> expressions;
        private final Predicate<String> attributePredicate;

        public AttributesCollector(Predicate<String> attributePredicate, Set<String> expressions) {
            this.attributePredicate = Objects.requireNonNull(attributePredicate);
            this.expressions = Objects.requireNonNull(expressions);
        }

        @Override
        public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
            for (int i = 0; i < attributes.getLength(); i++) {
                String value = attributes.getValue(i);
                if (this.attributePredicate.test(value)) {
                    expressions.add(value);
                }
            }
        }
    }

    public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException {
        Set<String> expressions = new HashSet<>();
        Predicate<String> isAQLExpression = (value) -> value.startsWith("aql:");
        SAXParser saxParser = SAXParserFactory.newInstance().newSAXParser();
        saxParser.parse(Path.of(args[0]).toFile(), new AttributesCollector(isAQLExpression, expressions));
        expressions.stream().sorted().forEach(System.out::println);
    }
}