uk.ac.manchester.cs.AcceptHeaderBuilder Maven / Gradle / Ivy
package uk.ac.manchester.cs;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.TreeSet;
import java.util.stream.Collectors;
import org.semanticweb.owlapi.io.OWLParserFactory;
import org.semanticweb.owlapi.util.PriorityCollection;
/**
* Accept header builder.
*
* @author ignazio
*/
public class AcceptHeaderBuilder {
/**
* @param parsers parsers to inspect
* @return accept headers from all parsers
*/
public static String headersFromParsers(PriorityCollection parsers) {
Map> map = new HashMap<>();
parsers.forEach(p -> addToMap(map, p.getMIMETypes()));
return map.entrySet().stream().sorted(AcceptHeaderBuilder::compare)
.map(AcceptHeaderBuilder::tostring).collect(Collectors.joining(", "));
}
private static void addToMap(Map> map, List mimes) {
// The map will contain all mime types with their position in all lists mentioning them; the
// smallest position first
for (int i = 0; i < mimes.size(); i++) {
map.computeIfAbsent(mimes.get(i), k -> new TreeSet<>()).add(Integer.valueOf(i + 1));
}
}
private static String tostring(Map.Entry> e) {
return String.format("%s; q=%.1f", e.getKey(),
Double.valueOf(1D / e.getValue().first().intValue()));
}
private static int compare(Map.Entry> a,
Map.Entry> b) {
return a.getValue().first().compareTo(b.getValue().first());
}
}