rspec/rules/S1199/java/rule.adoc

== Why is this an issue?

include::../description.adoc[]

=== Exceptions

The usage of a code block after a `case` is allowed.

== How to fix it

The nested code blocks should be extracted into separate methods.

=== Code examples

==== Noncompliant code example

[source,java,diff-id=1,diff-type=noncompliant]
----
class Example {

    private final Deque<Integer> stack = new LinkedList<>();

    public void evaluate(int operator) {
      switch (operator) {
        case ADD: {
          /* ... */
          { // Noncompliant - Extract this nested code block into a method
            int a = stack.pop();
            int b = stack.pop();
            int result = a + b;
            stack.push(result);
          }
          /* ... */
          break;
        }
        /* ... */
      }
    }
}
----

==== Compliant solution

[source,java,diff-id=1,diff-type=compliant]
----
class Example {

    private final Deque<Integer> stack = new LinkedList<>();

    public void evaluate(int operator) {
      switch (operator) {
        case ADD: {
          /* ... */
          evaluateAdd();
          /* ... */
          break;
        }
        /* ... */
      }
    }

    private void evaluateAdd() {
      int a = stack.pop();
      int b = stack.pop();
      int result = a + b;
      stack.push(result);
    }
}
----

== Resources

=== Documentation
* Wikipedia - https://en.wikipedia.org/wiki/Single-responsibility_principle[Single Responsibility Principle]
* Baeldung -  https://www.baeldung.com/java-single-responsibility-principle[Single Responsibility Principle]