CallMatcher: add default method for restricting language level

plugins/InspectionGadgets/InspectionGadgetsAnalysis/src/com/siyeh/ig/callMatcher/CallMatcher.java

@@ -1,6 +1,7 @@
 // Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package com.siyeh.ig.callMatcher;
 
+import com.intellij.pom.java.LanguageLevel;
 import com.intellij.psi.*;
 import com.intellij.psi.util.InheritanceUtil;
 import com.intellij.psi.util.PsiUtil;
@@ -160,6 +161,38 @@ public interface CallMatcher extends Predicate<PsiMethodCallExpression> {
     return null;
   }
 
+
+  default CallMatcher withLanguageLevelAtLeast(@NotNull LanguageLevel level) {
+    return new CallMatcher() {
+      @Override
+      public Stream<String> names() {
+        return CallMatcher.this.names();
+      }
+
+      @Override
+      public boolean methodReferenceMatches(PsiMethodReferenceExpression methodRef) {
+        return CallMatcher.this.methodReferenceMatches(methodRef);
+      }
+
+      @Override
+      public boolean test(@Nullable PsiMethodCallExpression call) {
+        if (call == null || PsiUtil.getLanguageLevel(call).isAtLeast(level)) return false;
+        return CallMatcher.this.test(call);
+      }
+
+      @Override
+      public boolean methodMatches(@Nullable PsiMethod method) {
+        if (method == null || PsiUtil.getLanguageLevel(method).isAtLeast(level)) return false;
+        return CallMatcher.this.methodMatches(method);
+      }
+
+      @Override
+      public String toString() {
+        return CallMatcher.this.toString();
+      }
+    };
+  }
+
   class Simple implements CallMatcher {
     static final Simple ENUM_VALUES = new Simple("", Collections.singleton("values"), ArrayUtil.EMPTY_STRING_ARRAY, CallType.ENUM_STATIC);
     static final Simple ENUM_VALUE_OF =

plugins/InspectionGadgets/InspectionGadgetsAnalysis/src/com/siyeh/ig/psiutils/BoolUtils.java

@@ -101,10 +101,6 @@ public class BoolUtils {
       CallMatcher.exactInstanceCall(OPTIONAL_DOUBLE, "isEmpty").parameterCount(0)
     );
 
-  private static Predicate<PsiMethodCallExpression> withMinimalLanguageLevel(CallMatcher matcher, LanguageLevel level) {
-    return matcher.and(expression -> PsiUtil.getLanguageLevel(expression).isAtLeast(level));
-  }
-
   private static class PredicatedReplacement {
     Predicate<PsiMethodCallExpression> predicate;
     String name;
@@ -118,7 +114,7 @@ public class BoolUtils {
   private static final List<PredicatedReplacement> ourReplacements = new ArrayList<>();
   static {
     ourReplacements.add(new PredicatedReplacement(OPTIONAL_IS_EMPTY, "isPresent"));
-    ourReplacements.add(new PredicatedReplacement(withMinimalLanguageLevel(OPTIONAL_IS_PRESENT, LanguageLevel.JDK_11), "isEmpty"));
+    ourReplacements.add(new PredicatedReplacement(OPTIONAL_IS_PRESENT.withLanguageLevelAtLeast(LanguageLevel.JDK_11), "isEmpty"));
     ourReplacements.add(new PredicatedReplacement(STREAM_ANY_MATCH, "noneMatch"));
     ourReplacements.add(new PredicatedReplacement(STREAM_NONE_MATCH, "anyMatch"));
   }