Examples of java.lang.invoke.MethodHandle.type()

java.lang.invoke.MethodHandle.type()
Reports the type of this method handle. Every invocation of this method handle via {@code invokeExact} must exactly match this type. @return the method handle type

            Class< ? extends Object> class2 = v2.getClass();
            MethodHandle op = lookupBinaryOp(opName, class1, class2);


            // convert arguments
            MethodType type = type();
            MethodType opType = op.type();
            if (opType.parameterType(0) == String.class) {
                if (opType.parameterType(1) == String.class) {
                    op = MethodHandles.filterArguments(op,
                            0,
                            TO_STRING,

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            // do not optimize non-deterministic functions
            if (optimize && !function.isDeterministic()) {
                return new FunctionCall(node.getName(), node.getWindow().orNull(), node.isDistinct(), toExpressions(argumentValues));
            }
            MethodHandle handle = function.getScalarFunction();
            if (handle.type().parameterCount() > 0 && handle.type().parameterType(0) == Session.class) {
                handle = handle.bindTo(session);
            }
            try {
                return handle.invokeWithArguments(argumentValues);
            }

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            // do not optimize non-deterministic functions
            if (optimize && !function.isDeterministic()) {
                return new FunctionCall(node.getName(), node.getWindow().orNull(), node.isDistinct(), toExpressions(argumentValues));
            }
            MethodHandle handle = function.getScalarFunction();
            if (handle.type().parameterCount() > 0 && handle.type().parameterType(0) == Session.class) {
                handle = handle.bindTo(session);
            }
            try {
                return handle.invokeWithArguments(argumentValues);
            }

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            // do not optimize non-deterministic functions
            if (optimize && !function.isDeterministic()) {
                return new FunctionCall(node.getName(), node.getWindow().orNull(), node.isDistinct(), toExpressions(argumentValues));
            }
            MethodHandle handle = function.getScalarFunction();
            if (handle.type().parameterCount() > 0 && handle.type().parameterType(0) == Session.class) {
                handle = handle.bindTo(session);
            }
            try {
                return handle.invokeWithArguments(argumentValues);
            }

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            // do not optimize non-deterministic functions
            if (optimize && !function.isDeterministic()) {
                return new FunctionCall(node.getName(), node.getWindow().orNull(), node.isDistinct(), toExpressions(argumentValues));
            }
            MethodHandle handle = function.getScalarFunction();
            if (handle.type().parameterCount() > 0 && handle.type().parameterType(0) == Session.class) {
                handle = handle.bindTo(session);
            }
            try {
                return handle.invokeWithArguments(argumentValues);
            }

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            // attempt IR direct binding
            if (method instanceof CompiledIRMethod) {
                mh = (MethodHandle)((CompiledIRMethod)method).getHandle();


                if (!block) {
                    mh = MethodHandles.insertArguments(mh, mh.type().parameterCount() - 1, Block.NULL_BLOCK);
                }


                mh = MethodHandles.insertArguments(mh, 1, ((CompiledIRMethod)method).getStaticScope());
//                System.out.println("binding IR compiled direct: " + site.name);
            }

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    Object result = env.asFunction("return a + b", "a", "b");


    assertThat(result, instanceOf(MethodHandle.class));
    MethodHandle func = (MethodHandle) result;


    assertThat(func.type().parameterCount(), is(2));
    assertThat((Integer) func.invoke(10, 5), is(15));
  }


  @Test
  public void run() throws Throwable {

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    String code = "|a, b| -> a + b";


    Object result = env.def(code);
    assertThat(result, instanceOf(MethodHandle.class));
    MethodHandle func = (MethodHandle) result;
    assertThat(func.type().parameterCount(), is(2));
    assertThat((Integer) func.invoke(10, 5), is(15));
  }


  @Test
  public void check_source_present_with_compilation_error() {

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  public static Object dispatchGetterStyle(String property, DynamicObject object) throws Throwable {
    Object value = object.get(property);
    if (value != null || object.properties.containsKey(property)) {
      if (value instanceof MethodHandle) {
        MethodHandle handle = (MethodHandle) value;
        if (handle.type().parameterCount() == 1 || handle.isVarargsCollector()) {
          return handle.invokeWithArguments(object);
        }
      }
      return value;
    }

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  public static Object dispatchSetterStyle(String property, DynamicObject object, Object arg) throws Throwable {
    Object value = object.get(property);
    if (value != null || object.properties.containsKey(property)) {
      if (value instanceof MethodHandle) {
        MethodHandle handle = (MethodHandle) value;
        if (handle.type().parameterCount() == 2) {
          if (handle.isVarargsCollector() && arg instanceof Object[]) {
            return handle.invokeExact((Object) object, (Object[]) arg);
          }
          return handle.invokeWithArguments(object, arg);
        }

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