IG: replace unnecessary boxing with Boolean constant (IDEA-152361)

plugins/InspectionGadgets/InspectionGadgetsAnalysis/src/com/siyeh/ig/migration/UnnecessaryBoxingInspection.java

@@ -99,6 +99,17 @@ public class UnnecessaryBoxingInspection extends BaseInspection {
         return;
       }
       final PsiExpression unboxedExpression = arguments[0];
+      final Object value = ExpressionUtils.computeConstantExpression(unboxedExpression);
+      if (value != null) {
+        if (value == Boolean.TRUE) {
+          PsiReplacementUtil.replaceExpression(expression, "java.lang.Boolean.TRUE");
+          return;
+        }
+        else if (value == Boolean.FALSE) {
+          PsiReplacementUtil.replaceExpression(expression, "java.lang.Boolean.FALSE");
+          return;
+        }
+      }
       final String replacementText = getUnboxedExpressionText(unboxedExpression, boxedType);
       if (replacementText == null) {
         return;

plugins/InspectionGadgets/testsrc/com/siyeh/ig/fixes/migration/UnnecessaryBoxingFixTest.java

@@ -56,6 +56,12 @@ public class UnnecessaryBoxingFixTest extends IGQuickFixesTestCase {
                  "Double l = 1d;");
   }
 
+  public void testBooleanLiteral() {
+    doMemberTest(InspectionGadgetsBundle.message("unnecessary.boxing.remove.quickfix"),
+                 "final Boolean aBoolean = Boolean.valueOf(/**/true);",
+                 "final Boolean aBoolean = Boolean.TRUE;");
+  }
+
   public void testCast() {
     doFixTest();
   }