having a go at quality issues on singleton enum Predicates

1 files changed, 5 insertions, 6 deletions

diff --git a/sonar-core/src/main/java/org/sonar/core/plugins/PluginJarInstaller.java b/sonar-core/src/main/java/org/sonar/core/plugins/PluginJarInstaller.java
index ff90f7f1274..5af5f9c754f 100644
--- a/sonar-core/src/main/java/org/sonar/core/plugins/PluginJarInstaller.java
+++ b/sonar-core/src/main/java/org/sonar/core/plugins/PluginJarInstaller.java
@@ -25,13 +25,12 @@ import org.sonar.api.ServerComponent;
 import org.sonar.api.utils.SonarException;
 import org.sonar.updatecenter.common.PluginManifest;
 
+import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 import java.io.File;
 import java.io.IOException;
 import java.util.Arrays;
 
-import static com.google.common.base.Preconditions.checkNotNull;
-
 public abstract class PluginJarInstaller implements BatchComponent, ServerComponent {
 
   protected static final String FAIL_TO_INSTALL_PLUGIN = "Fail to install plugin: ";
@@ -95,14 +94,14 @@ public abstract class PluginJarInstaller implements BatchComponent, ServerCompon
 
   private final Function<File, DefaultPluginMetadata> jarFileToCorePlugin = new Function<File, DefaultPluginMetadata>() {
     @Override
-    public DefaultPluginMetadata apply(@Nullable File file) {
-      return extractMetadata(checkNotNull(file), true);
+    public DefaultPluginMetadata apply(@Nonnull File file) {
+      return extractMetadata(file, true);
     }
   };
   private final Function<File, DefaultPluginMetadata> jarFileToPlugin = new Function<File, DefaultPluginMetadata>() {
     @Override
-    public DefaultPluginMetadata apply(@Nullable File file) {
-      return extractMetadata(checkNotNull(file), false);
+    public DefaultPluginMetadata apply(@Nonnull File file) {
+      return extractMetadata(file, false);
     }
   };
 }