[java] fixed events without parameters #13109

Author: joerg1985

java/src/org/openqa/selenium/bidi/ConverterFunctions.java

@@ -49,4 +49,14 @@ public static <X> Function<JsonInput, X> map(final String keyName, Type typeOfX)
       return value;
     };
   }
+
+  public static Function<JsonInput, Void> empty() {
+    return input -> {
+      // expects an empty object
+      input.beginObject();
+      input.endObject();
+
+      return null;
+    };
+  }
 }

java/src/org/openqa/selenium/devtools/CdpClientGenerator.java

@@ -437,8 +437,9 @@ public BodyDeclaration<?> toMethodDeclaration() {
               .get()
               .addStatement(
                   String.format(
-                      "return new Event<>(\"%s.%s\", input -> null);", domain.name, name));
-        } else if (type instanceof ObjectType) {
+                      "return new Event<>(\"%s.%s\", input -> ConverterFunctions.empty());",
+                      domain.name, name));
+        } else if (type instanceof ObjectType || type instanceof ArrayType) {
           methodDecl
               .getBody()
               .get()
@@ -659,7 +660,7 @@ public MethodDeclaration toMethodDeclaration() {
         body.addStatement(
             String.format(
                 "return new Command<>(\"%s.%s\", Map.copyOf(params));", domain.name, name));
-      } else if (type instanceof ObjectType) {
+      } else if (type instanceof ObjectType || type instanceof ArrayType) {
         body.addStatement(
             String.format(
                 "return new Command<>(\"%s.%s\", Map.copyOf(params), input -> %s);",

java/src/org/openqa/selenium/devtools/Connection.java

@@ -299,12 +299,14 @@ private void handle(CharSequence data) {
                   // TODO: This is grossly inefficient. I apologise, and we should fix this.
                   try (StringReader reader = new StringReader(asString);
                       JsonInput input = JSON.newInput(reader)) {
-                    Object value = null;
+                    boolean hasParams = false;
+                    Object params = null;
                     input.beginObject();
                     while (input.hasNext()) {
                       switch (input.nextName()) {
                         case "params":
-                          value = event.getKey().getMapper().apply(input);
+                          hasParams = true;
+                          params = event.getKey().getMapper().apply(input);
                           break;
 
                         default:
@@ -314,21 +316,22 @@ private void handle(CharSequence data) {
                     }
                     input.endObject();
 
-                    if (value == null) {
-                      // Do nothing.
+                    if (!hasParams) {
+                      LOG.fine(
+                          "suppressed event '"
+                              + event.getKey().getMethod()
+                              + "', no params in input");
                       return;
                     }
 
-                    final Object finalValue = value;
-
                     for (Consumer<?> action : event.getValue()) {
                       @SuppressWarnings("unchecked")
                       Consumer<Object> obj = (Consumer<Object>) action;
                       LOG.log(
                           getDebugLogLevel(),
                           "Calling callback for {0} using {1} being passed {2}",
-                          new Object[] {event.getKey(), obj, finalValue});
-                      obj.accept(finalValue);
+                          new Object[] {event.getKey(), obj, params});
+                      obj.accept(params);
                     }
                   }
                 });