[java] module 'uses' statement highlighting

java/java-psi-impl/src/com/intellij/psi/impl/source/PsiJavaCodeReferenceElementImpl.java

@@ -175,6 +175,9 @@ public class PsiJavaCodeReferenceElementImpl extends CompositePsiElement impleme
       PsiJavaCodeReferenceCodeFragment fragment = (PsiJavaCodeReferenceCodeFragment)treeParent.getPsi();
       return fragment.isClassesAccepted() ? CLASS_FQ_OR_PACKAGE_NAME_KIND : PACKAGE_NAME_KIND;
     }
+    if (i == JavaElementType.USES_STATEMENT) {
+      return CLASS_FQ_NAME_KIND;
+    }
 
     diagnoseUnknownParent();
     return CLASS_NAME_KIND;

java/java-psi-impl/src/com/intellij/psi/impl/source/PsiUsesStatementImpl.java

@@ -17,16 +17,25 @@ package com.intellij.psi.impl.source;
 
 import com.intellij.psi.JavaElementVisitor;
 import com.intellij.psi.PsiElementVisitor;
+import com.intellij.psi.PsiJavaCodeReferenceElement;
 import com.intellij.psi.PsiUsesStatement;
 import com.intellij.psi.impl.source.tree.CompositePsiElement;
 import com.intellij.psi.impl.source.tree.JavaElementType;
+import com.intellij.psi.util.PsiTreeUtil;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
 public class PsiUsesStatementImpl extends CompositePsiElement implements PsiUsesStatement {
   public PsiUsesStatementImpl() {
     super(JavaElementType.USES_STATEMENT);
   }
 
+  @Nullable
+  @Override
+  public PsiJavaCodeReferenceElement getClassReference() {
+    return PsiTreeUtil.getChildOfType(this, PsiJavaCodeReferenceElement.class);
+  }
+
   @Override
   public void accept(@NotNull PsiElementVisitor visitor) {
     if (visitor instanceof JavaElementVisitor) {

java/java-psi-impl/src/messages/JavaErrorMessages.properties

@@ -402,6 +402,8 @@ package.not.found=Package not found: {0}
 package.is.empty=Package is empty: {0}
 module.duplicate.export=Duplicate export: {0}
 module.self.export=Exports to itself
+module.service.enum=The service definition is an enum: {0}
+module.duplicate.uses=Duplicate uses: {0}
 
 feature.generics=Generics
 feature.annotations=Annotations