SSR: isIdentifier() parameter is nullable

java/structuralsearch-java/src/com/intellij/structuralsearch/JavaStructuralSearchProfile.java

@@ -761,7 +761,7 @@ public class JavaStructuralSearchProfile extends StructuralSearchProfile {
   }
 
   @Override
-  public boolean isIdentifier(PsiElement element) {
+  public boolean isIdentifier(@Nullable PsiElement element) {
     return element instanceof PsiIdentifier;
   }
 

platform/structuralsearch/source/com/intellij/structuralsearch/StructuralSearchProfile.java

@@ -263,7 +263,7 @@ public abstract class StructuralSearchProfile {
   }
 
   @Contract("null -> false")
-  public boolean isIdentifier(PsiElement element) {
+  public boolean isIdentifier(@Nullable PsiElement element) {
     return false;
   }
 

platform/structuralsearch/source/com/intellij/structuralsearch/XmlStructuralSearchProfile.java

@@ -47,7 +47,7 @@ public class XmlStructuralSearchProfile extends StructuralSearchProfile {
   }
 
   @Override
-  public boolean isIdentifier(PsiElement element) {
+  public boolean isIdentifier(@Nullable PsiElement element) {
     return element instanceof XmlToken && ((XmlToken)element).getTokenType() == XmlTokenType.XML_NAME;
   }
 

plugins/groovy/structuralsearch-groovy/src/com/intellij/structuralsearch/GroovyStructuralSearchProfile.java

@@ -68,7 +68,7 @@ public class GroovyStructuralSearchProfile extends StructuralSearchProfileBase {
   }
 
   @Override
-  public boolean isIdentifier(PsiElement element) {
+  public boolean isIdentifier(@Nullable PsiElement element) {
     return element instanceof PsiIdentifier;
   }
 }