use simplename of namespace strategy, to simplify i18n

scm-webapp/src/main/java/sonia/scm/api/v2/resources/NamespaceStrategyResource.java

@@ -59,7 +59,7 @@ public class NamespaceStrategyResource {
   }
 
   private String strategyAsString(NamespaceStrategy namespaceStrategy) {
-    return namespaceStrategy.getClass().getName();
+    return namespaceStrategy.getClass().getSimpleName();
   }
 
   private List<String> collectStrategyNames() {

scm-webapp/src/main/java/sonia/scm/repository/NamespaceStrategyProvider.java

@@ -0,0 +1,38 @@
+package sonia.scm.repository;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import sonia.scm.config.ScmConfiguration;
+
+import javax.inject.Inject;
+import javax.inject.Provider;
+import java.util.Set;
+
+public class NamespaceStrategyProvider implements Provider<NamespaceStrategy> {
+
+  private static final Logger LOG = LoggerFactory.getLogger(NamespaceStrategyProvider.class);
+
+  private final Set<NamespaceStrategy> strategies;
+  private final ScmConfiguration scmConfiguration;
+
+  @Inject
+  public NamespaceStrategyProvider(Set<NamespaceStrategy> strategies, ScmConfiguration scmConfiguration) {
+    this.strategies = strategies;
+    this.scmConfiguration = scmConfiguration;
+  }
+
+  @Override
+  public NamespaceStrategy get() {
+    String namespaceStrategy = scmConfiguration.getDefaultNamespaceStrategy();
+
+    for (NamespaceStrategy s : this.strategies) {
+      if (s.getClass().getSimpleName().equals(namespaceStrategy)) {
+          return s;
+      }
+    }
+
+    LOG.warn("could not find namespace strategy {}, using default strategy", namespaceStrategy);
+    return new UsernameNamespaceStrategy();
+  }
+
+}