OptionalToIfInspection: added inspection to desugar optional chain to sequence of if statements (IDEA-212269)

GitOrigin-RevId: c83b70e05544529b3dfffe24bc87997910edcb56

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/optionalToIf/beforeFlatMap.java

@@ -0,0 +1,36 @@
+// "Fix all 'Optional can be replaced with sequence of if statements' problems in file" "true"
+
+class Test {
+
+  private void reusesVariable(String in) {
+    Object out = Optional.of<caret>(in).flatMap(o -> Optional.of(o)).map(o -> id(o)).get();
+  }
+
+  private void checkIsRemoved(String in) {
+    String out = Optional.of(in).flatMap(s -> Optional.of(in)).get();
+  }
+
+  void simple(String in) {
+    String out = Optional.ofNullable<caret>(in).flatMap(s -> Optional.of(s)).orElse("bar");
+  }
+
+  void simpleWithMap(String in) {
+    String out = Optional.ofNullable<caret>(in).flatMap(s -> Optional.of(s).map(v -> id(v))).orElse("bar");
+  }
+
+  void nested(String in) {
+    String out = Optional.ofNullable(in).flatMap(s1 -> Optional.of(s1).flatMap(s2 -> Optional.of(s2))).orElse("bar");
+  }
+
+  void outer(String in, String p) {
+    String out = Optional.ofNullable(in).flatMap(s1 -> Optional.of(s1).flatMap(s2 -> Optional.of(s2 + s1 + p))).orElse("bar");
+  }
+
+  void nullableOuter(String in, String p) {
+    String out = Optional.ofNullable(in).flatMap(s1 -> Optional.of(p)).orElse("bar");
+  }
+
+  <T> T id(T t) {
+    return t;
+  }
+}