java7 cast conventions

java/java-psi-api/src/com/intellij/psi/util/TypeConversionUtil.java

@@ -470,7 +470,18 @@ public class TypeConversionUtil {
                        || ltypeRank == BOOL_RANK && rtypeRank == BOOL_RANK;
       }
       else {
-        if (isPrimitiveAndNotNull(ltype) || isPrimitiveAndNotNull(rtype)) return false;
+        if (isPrimitiveAndNotNull(ltype)) {
+          if (rtype instanceof PsiClassType && ((PsiClassType)rtype).getLanguageLevel().isAtLeast(LanguageLevel.JDK_1_7)) {
+            return areTypesConvertible(ltype, rtype);
+          }
+          return false;
+        }
+        if (isPrimitiveAndNotNull(rtype)) {
+          if (ltype instanceof PsiClassType && ((PsiClassType)ltype).getLanguageLevel().isAtLeast(LanguageLevel.JDK_1_7)) {
+            return areTypesConvertible(rtype, ltype);
+          }
+          return false;
+        }
         isApplicable = areTypesConvertible(ltype, rtype) || areTypesConvertible(rtype, ltype);
       }
     }

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/advHighlighting7/Java7CastConventions.java

@@ -0,0 +1,7 @@
+class Test {
+  public static void main(String[] args) {
+    Object o = null;
+    if (o == 1) {}
+    if (1 == o) {}
+  }
+}

java/java-tests/testSrc/com/intellij/codeInsight/daemon/LightAdvHighlightingJdk7Test.java

@@ -162,4 +162,5 @@ public class LightAdvHighlightingJdk7Test extends LightDaemonAnalyzerTestCase {
   public void testMethodReferences() throws Exception { doTest(false, true, false); }
   public void testUsedMethodsByMethodReferences() throws Exception { doTest(true, true, false); }
   public void testLambdaExpressions() throws Exception { doTest(false, true, false); }
+  public void testJava7CastConventions() throws Exception { doTest(false, true, false); }
 }