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

java.lang.invoke.MethodHandle.invokeExact()
Invokes the method handle, allowing any caller type descriptor, but requiring an exact type match. The symbolic type descriptor at the call site of {@code invokeExact} mustexactly match this method handle's {@link #type type}. No conversions are allowed on arguments or return values.
When this method is observed via the Core Reflection API, it will appear as a single native method, taking an object array and returning an object. If this native method is invoked directly via {@link java.lang.reflect.Method#invoke java.lang.reflect.Method.invoke}, via JNI, or indirectly via {@link java.lang.invoke.MethodHandles.Lookup#unreflect Lookup.unreflect}, it will throw an {@code UnsupportedOperationException}. @param args the signature-polymorphic parameter list, statically represented using varargs @return the signature-polymorphic result, statically represented using {@code Object} @throws WrongMethodTypeException if the target's type is not identical with the caller's symbolic type descriptor @throws Throwable anything thrown by the underlying method propagates unchanged through the method handle call

        MethodHandle handle = Binder
                .from(Object.class)
                .constant("hello");


        assertEquals(MethodType.methodType(Object.class), handle.type());
        assertEquals("hello", (Object)handle.invokeExact());
    }


    @Test
    public void testIdentity() throws Throwable {
        MethodHandle handle = Binder

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        MethodHandle handle = Binder
                .from(String.class, String.class)
                .identity();


        assertEquals(MethodType.methodType(String.class, String.class), handle.type());
        assertEquals("hello", (String)handle.invokeExact("hello"));
    }


    @Test
    public void testFold() throws Throwable {
        MethodHandle target = Subjects.concatHandle();

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                .from(String.class, String.class)
                .fold(fold)
                .invoke(target);


        assertEquals(MethodType.methodType(String.class, String.class), handle.type());
        assertEquals("yahoofoo", (String)handle.invokeExact("foo"));
    }


    @Test
    public void testFoldStatic() throws Throwable {
        MethodHandle target = Subjects.concatHandle();

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                .from(LOOKUP, String.class, String.class)
                .foldStatic(BinderTest.class, "alwaysYahooStatic")
                .invoke(target);


        assertEquals(MethodType.methodType(String.class, String.class), handle.type());
        assertEquals("yahoofoo", (String)handle.invokeExact("foo"));
    }


    @Test
    public void testFoldVirtual() throws Throwable {
        MethodHandle target = Subjects.concatHandle();

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                .foldVirtual("alwaysYahooVirtual")
                .drop(1)
                .invoke(target);


        assertEquals(MethodType.methodType(String.class, String.class), handle.type());
        assertEquals("yahoofoo", (String)handle.invokeExact("foo"));
    }


    @Test
    public void testFilter() throws Throwable {
        MethodHandle target = Subjects.concatHandle();

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                .from(String.class, String.class, String.class)
                .filter(0, filter, filter)
                .invoke(target);


        assertEquals(MethodType.methodType(String.class, String.class, String.class), handle.type());
        assertEquals("foobazbarbaz", (String)handle.invokeExact("foo", "bar"));
    }


    @Test
    public void testInvoke() throws Throwable {
        MethodHandle target = Subjects.concatHandle();

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        MethodHandle handle = Binder
                .from(String.class, String.class, String.class)
                .invoke(target);


        assertEquals(MethodType.methodType(String.class, String.class, String.class), handle.type());
        assertEquals("Hello, world", (String) handle.invokeExact("Hello, ", "world"));
    }


    @Test
    public void testInvokeReflected() throws Throwable {
        Method target = Subjects.class.getMethod("concatStatic", String.class, String.class);

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        MethodHandle handle = Binder
                .from(String.class, String.class, String.class)
                .invoke(LOOKUP, target);


        assertEquals(MethodType.methodType(String.class, String.class, String.class), handle.type());
        assertEquals("Hello, world", (String) handle.invokeExact("Hello, ", "world"));
    }


    @Test
    public void testInvokeReflected2() throws Throwable {
        Method target = Subjects.class.getMethod("concatStatic", String.class, String.class);

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        MethodHandle handle = Binder
                .from(String.class, String.class, String.class)
                .invokeQuiet(LOOKUP, target);


        assertEquals(MethodType.methodType(String.class, String.class, String.class), handle.type());
        assertEquals("Hello, world", (String) handle.invokeExact("Hello, ", "world"));
    }


    @Test
    public void testInvokeStatic() throws Throwable {
        MethodHandle handle = Binder

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        MethodHandle handle = Binder
                .from(String.class, String.class, String.class)
                .invokeStatic(LOOKUP, Subjects.class, "concatStatic");


        assertEquals(MethodType.methodType(String.class, String.class, String.class), handle.type());
        assertEquals("Hello, world", (String) handle.invokeExact("Hello, ", "world"));
    }


    @Test
    public void testInvokeStatic2() throws Throwable {
        MethodHandle handle = Binder

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