List of invokeWithArguments() Examples

Examples of invokeWithArguments()

java.lang.invoke.MethodHandle.invokeWithArguments()
Performs a variable arity invocation, passing the arguments in the given list to the method handle, as if via an inexact {@link #invoke invoke} from a call sitewhich mentions only the type {@code Object}, and whose arity is the length of the argument list.
Specifically, execution proceeds as if by the following steps, although the methods are not guaranteed to be called if the JVM can predict their effects.
- Determine the length of the argument array as {@code N}. For a null reference, {@code N=0}.
- Determine the general type {@code TN} of {@code N} arguments asas {@code TN=MethodType.genericMethodType(N)}.
- Force the original target method handle {@code MH0} to therequired type, as {@code MH1 = MH0.asType(TN)}.
- Spread the array into {@code N} separate arguments {@code A0, ...}.
- Invoke the type-adjusted method handle on the unpacked arguments: MH1.invokeExact(A0, ...).
- Take the return value as an {@code Object} reference.
Because of the action of the {@code asType} step, the following argumentconversions are applied as necessary:
- reference casting
- unboxing
- widening primitive conversions
The result returned by the call is boxed if it is a primitive, or forced to null if the return type is void.
This call is equivalent to the following code:
```
 {@code MethodHandle invoker = MethodHandles.spreadInvoker(this.type(), 0); Object result = invoker.invokeExact(this, arguments);}
```
Unlike the signature polymorphic methods {@code invokeExact} and {@code invoke}, {@code invokeWithArguments} can be accessed normally via the Core Reflection API and JNI.It can therefore be used as a bridge between native or reflective code and method handles. @param arguments the arguments to pass to the target @return the result returned by the target @throws ClassCastException if an argument cannot be converted by reference casting @throws WrongMethodTypeException if the target's type cannot be adjusted to take the given number of {@code Object} arguments @throws Throwable anything thrown by the target method invocation @see MethodHandles#spreadInvoker

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

    MethodHandle handle = OperatorSupport.bootstrap(lookup(), "plus", BINOP_TYPE, 2).dynamicInvoker();


    Integer three = (Integer) handle.invokeWithArguments(1, 2);
    assertThat(three, is(3));


    String str = (String) handle.invokeWithArguments("Foo", "Bar");
    assertThat(str, is("FooBar"));


    str = (String) handle.invokeWithArguments("x=", 1);
    assertThat(str, is("x=1"));

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

    assertThat(three, is(3));


    String str = (String) handle.invokeWithArguments("Foo", "Bar");
    assertThat(str, is("FooBar"));


    str = (String) handle.invokeWithArguments("x=", 1);
    assertThat(str, is("x=1"));


    str = (String) handle.invokeWithArguments(1, "=x");
    assertThat(str, is("1=x"));

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

    assertThat(str, is("FooBar"));


    str = (String) handle.invokeWithArguments("x=", 1);
    assertThat(str, is("x=1"));


    str = (String) handle.invokeWithArguments(1, "=x");
    assertThat(str, is("1=x"));


    str = (String) handle.invokeWithArguments("=> ", new Object() {
      @Override
      public String toString() {

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

    assertThat(str, is("x=1"));


    str = (String) handle.invokeWithArguments(1, "=x");
    assertThat(str, is("1=x"));


    str = (String) handle.invokeWithArguments("=> ", new Object() {
      @Override
      public String toString() {
        return "Mr Bean";
      }
    });

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

  }


  @Test(expectedExceptions = IllegalArgumentException.class)
  public void plus_cannot_add_object_and_object() throws Throwable {
    MethodHandle handle = OperatorSupport.bootstrap(lookup(), "plus", BINOP_TYPE, 2).dynamicInvoker();
    handle.invokeWithArguments(new Object(), new Object());
  }


  @Test(expectedExceptions = IllegalArgumentException.class)
  public void plus_cannot_add_object_and_integer() throws Throwable {
    MethodHandle handle = OperatorSupport.bootstrap(lookup(), "plus", BINOP_TYPE, 2).dynamicInvoker();

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

  }


  @Test(expectedExceptions = IllegalArgumentException.class)
  public void plus_cannot_add_object_and_integer() throws Throwable {
    MethodHandle handle = OperatorSupport.bootstrap(lookup(), "plus", BINOP_TYPE, 2).dynamicInvoker();
    handle.invokeWithArguments(new Object(), 1);
  }


  @Test(expectedExceptions = IllegalArgumentException.class)
  public void plus_cannot_add_integer_and_object() throws Throwable {
    MethodHandle handle = OperatorSupport.bootstrap(lookup(), "plus", BINOP_TYPE, 2).dynamicInvoker();

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

  }


  @Test(expectedExceptions = IllegalArgumentException.class)
  public void plus_cannot_add_integer_and_object() throws Throwable {
    MethodHandle handle = OperatorSupport.bootstrap(lookup(), "plus", BINOP_TYPE, 2).dynamicInvoker();
    handle.invokeWithArguments(1, new Object());
  }


  @Test
  public void check_minus() throws Throwable {
    MethodHandle handle = OperatorSupport.bootstrap(lookup(), "minus", BINOP_TYPE, 2).dynamicInvoker();

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


  @Test
  public void check_minus() throws Throwable {
    MethodHandle handle = OperatorSupport.bootstrap(lookup(), "minus", BINOP_TYPE, 2).dynamicInvoker();


    Integer three = (Integer) handle.invokeWithArguments(5, 2);
    assertThat(three, is(3));
  }


  @Test(expectedExceptions = IllegalArgumentException.class)
  public void minus_cannot_substract_objects() throws Throwable {

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

  }


  @Test(expectedExceptions = IllegalArgumentException.class)
  public void minus_cannot_substract_objects() throws Throwable {
    MethodHandle handle = OperatorSupport.bootstrap(lookup(), "minus", BINOP_TYPE, 2).dynamicInvoker();
    handle.invokeWithArguments(new Object(), new Object());
  }


  @Test
  public void check_divide() throws Throwable {
    MethodHandle handle = OperatorSupport.bootstrap(lookup(), "divide", BINOP_TYPE, 2).dynamicInvoker();

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


  @Test
  public void check_divide() throws Throwable {
    MethodHandle handle = OperatorSupport.bootstrap(lookup(), "divide", BINOP_TYPE, 2).dynamicInvoker();


    Integer two = (Integer) handle.invokeWithArguments(4, 2);
    assertThat(two, is(2));
  }


  @Test(expectedExceptions = IllegalArgumentException.class)
  public void cannot_divide_objects() throws Throwable {

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