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[core] Add cache to XmppElementUtil.getQNameFor(Class)

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This commit is contained in:
Florian Schmaus 2020-08-28 09:47:09 +02:00
parent cf4c9725b7
commit 1aab0b8aac
1 changed files with 15 additions and 2 deletions
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17
smack-core/src/main/java/org/jivesoftware/smack/util/XmppElementUtil.java
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@ -25,15 +25,26 @@ import javax.xml.namespace.QName;
import org.jivesoftware.smack.packet.FullyQualifiedElement;
import org.jxmpp.util.cache.LruCache;
public class XmppElementUtil {
private static final LruCache<Class<? extends FullyQualifiedElement>, QName> CLASS_TO_QNAME_CACHE = new LruCache<>(512);
public static final Logger LOGGER = Logger.getLogger(XmppElementUtil.class.getName());
public static QName getQNameFor(Class<? extends FullyQualifiedElement> fullyQualifiedElement) {
QName qname = CLASS_TO_QNAME_CACHE.get(fullyQualifiedElement);
if (qname != null) {
return qname;
}
try {
Object qnameObject = fullyQualifiedElement.getField("QNAME").get(null);
if (QName.class.isAssignableFrom(qnameObject.getClass())) {
return (QName) qnameObject;
qname = (QName) qnameObject;
CLASS_TO_QNAME_CACHE.put(fullyQualifiedElement, qname);
return qname;
}
LOGGER.warning("The QNAME field of " + fullyQualifiedElement + " is not of type QNAME.");
} catch (NoSuchFieldException e) {
@ -52,7 +63,9 @@ public class XmppElementUtil {
throw new IllegalArgumentException("The " + fullyQualifiedElement + " has no ELEMENT, NAMESPACE or QNAME member. Consider adding QNAME", e);
}
return new QName(namespace, element);
qname = new QName(namespace, element);
CLASS_TO_QNAME_CACHE.put(fullyQualifiedElement, qname);
return qname;
}
public static <E extends FullyQualifiedElement, R extends FullyQualifiedElement> List<R> getElementsFrom(