/*xml
   <module name="Checker">
     <module name="TreeWalker">
       <module name="NeedBraces">
         <property name="tokens" value="LAMBDA"/>
         <property name="allowSingleLineStatement" value="true"/>
       </module>
     </module>
   </module>
  */
  
  package com.puppycrawl.tools.checkstyle.checks.blocks.needbraces;
  
  import java.util.EnumSet;
  import java.util.concurrent.CompletableFuture;
  
  // xdoc section -- start
  class Example6 {
    enum HttpMethod {GET, OPTIONS}
    Object result = new Object();
    private CustomCompletableFuture<Object> allowedFuture;
    Example6() {
      allowedFuture = new CustomCompletableFuture<>();
      // violation below ''->' construct must use '{}'s'
      allowedFuture.addCallback(result -> assertEquals("Invalid response",
                      EnumSet.of(HttpMethod.GET, HttpMethod.OPTIONS), result),
              ex -> fail(ex.getMessage()));
      allowedFuture.addCustomCallback(() -> {
        return assertEquals("Invalid response",
                EnumSet.of(HttpMethod.GET, HttpMethod.OPTIONS), result);},
              ex -> fail(ex.getMessage()));}
    private Object assertEquals(String invalidResponse, EnumSet<HttpMethod> get,
                                Object result) {
      return result;}
    private String fail(String message) {
      return message;
    }}
  class CustomCompletableFuture<T> {
    private CompletableFuture<T> allowedFuture;
    public CustomCompletableFuture() {
      allowedFuture = new CompletableFuture<>();
    }
    public void addCallback(java.util.function.Consumer<T> successCallback,
            java.util.function.Consumer<Throwable> failureCallback) {}
    public void addCustomCallback(java.util.function.Supplier<Object> successLambda,
            java.util.function.Consumer<Throwable> failureLambda) {}
  }
  // xdoc section -- end