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/beforeOf.java

@@ -0,0 +1,25 @@
+// "Fix all 'Optional can be replaced with sequence of if statements' problems in file" "true"
+
+class Test {
+
+  void exceptionIsThrownOnNullValue(String in) {
+    String out = Optional.of<caret>(in).get();
+  }
+
+  void exceptionIsTheSameWithOrElseThrow(String in) {
+    Integer out = Optional.of(in).map(s -> getLen(s)).orElseThrow(() -> new IllegalArgumentException("value is null"));
+  }
+
+  void redundantCheckIsRemoved() {
+    String in = "not null value";
+    String out = Optional.of(in).orElseThrow(() -> new IllegalArgumentException("value is null"));
+  }
+
+  private Integer getLen(String s) {
+    return s.startsWith("abc") ? null : s;
+  }
+
+  private Integer filterLen(String s) {
+    return s.length() > 42 ? s.length() : null;
+  }
+}