vanitasvitae/Smack
1
0
Fork 0
mirror of https://github.com/vanitasvitae/Smack.git synced 2024-11-29 07:22:07 +01:00
Code Issues Releases Wiki Activity

[core] Add XmppElementUtil.castOrThrow(ExtensionElement, Class)

Browse source 
This method throws an IllegalStateException if the provided extension
element is not of the expected type and hints users towards potential
causes.
This commit is contained in:
Florian Schmaus 2020-08-28 09:51:07 +02:00
parent 99297e5a76
commit d06e9499e8
1 changed files with 35 additions and 6 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

41
smack-core/src/main/java/org/jivesoftware/smack/util/XmppElementUtil.java
View file

@ -23,7 +23,10 @@ import java.util.logging.Logger;
import javax.xml.namespace.QName;
import org.jivesoftware.smack.packet.ExtensionElement;
import org.jivesoftware.smack.packet.FullyQualifiedElement;
import org.jivesoftware.smack.packet.StandardExtensionElement;
import org.jivesoftware.smack.provider.ProviderManager;
import org.jxmpp.util.cache.LruCache;
@ -68,21 +71,47 @@ public class XmppElementUtil {
return qname;
}
public static <E extends FullyQualifiedElement, R extends FullyQualifiedElement> List<R> getElementsFrom(
MultiMap<QName, E> elementMap, Class<R> extensionElementClass) {
public static <E extends ExtensionElement> List<E> getElementsFrom(
MultiMap<QName, ExtensionElement> elementMap, Class<E> extensionElementClass) {
QName qname = XmppElementUtil.getQNameFor(extensionElementClass);
List<E> extensionElements = elementMap.getAll(qname);
List<ExtensionElement> extensionElements = elementMap.getAll(qname);
if (extensionElements.isEmpty()) {
return Collections.emptyList();
}
List<R> res = new ArrayList<>(extensionElements.size());
for (E extensionElement : extensionElements) {
R e = extensionElementClass.cast(extensionElement);
List<E> res = new ArrayList<>(extensionElements.size());
for (ExtensionElement extensionElement : extensionElements) {
E e = castOrThrow(extensionElement, extensionElementClass);
res.add(e);
}
return res;
}
public static <E extends ExtensionElement> E castOrThrow(ExtensionElement extensionElement, Class<E> extensionElementClass) {
if (!extensionElementClass.isInstance(extensionElement)) {
final QName qname = getQNameFor(extensionElementClass);
final String detailMessage;
if (extensionElement instanceof StandardExtensionElement) {
detailMessage = "because there is no according extension element provider registered with ProviderManager for "
+ qname
+ ". WARNING: This indicates a serious problem with your Smack setup, probably causing Smack not being able to properly initialize itself.";
} else {
Object provider = ProviderManager.getExtensionProvider(qname);
detailMessage = "because there is an inconsistency with the provider registered with ProviderManager: the active provider for "
+ qname + " '" + provider.getClass()
+ "' does not return instances of type " + extensionElementClass
+ ", but instead returns instances of type " + extensionElement.getClass() + ".";
}
String message = "Extension element is not of expected class '" + extensionElementClass.getName() + "', "
+ detailMessage;
throw new IllegalStateException(message);
}
return extensionElementClass.cast(extensionElement);
}
}