List of invokeExact() Examples

Examples of 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

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

                .from(String.class, Object.class, Integer.class, Float.class)
                .convert(target.type().returnType(), target.type().parameterArray())
                .invoke(target);


        assertEquals(MethodType.methodType(String.class, Object.class, Integer.class, Float.class), handle.type());
        assertEquals(null, (String)handle.invokeExact((Object)"foo", (Integer)5, (Float)5.0f));
    }


    @Test
    public void testCast() throws Throwable {
        MethodHandle target = mixedHandle();

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

                .from(String.class, Object.class, byte.class, int.class)
                .cast(target.type())
                .invoke(target);


        assertEquals(MethodType.methodType(String.class, Object.class, byte.class, int.class), handle.type());
        assertEquals(null, (String)handle.invokeExact((Object)"foo", (byte)5, 5));
    }


    @Test
    public void testCast2() throws Throwable {
        MethodHandle target = mixedHandle();

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

                .from(String.class, Object.class, byte.class, int.class)
                .cast(target.type().returnType(), target.type().parameterArray())
                .invoke(target);


        assertEquals(MethodType.methodType(String.class, Object.class, byte.class, int.class), handle.type());
        assertEquals(null, (String)handle.invokeExact((Object)"foo", (byte)5, 5));
    }


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

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

                .drop(0, 2)
                .permute(0, 0)
                .invoke(target);


        assertEquals(MethodType.methodType(String.class, Integer.class, Float.class, String.class), handle.type());
        assertEquals("foofoo", (String)handle.invokeExact((Integer) 0, (Float) 0.0f, "foo"));
    }


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

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

                .from(String.class, Object[].class)
                .spread(String.class, String.class)
                .invoke(target);
        
        assertEquals(MethodType.methodType(String.class, Object[].class), handle.type());
        assertEquals("foobar", (String)handle.invokeExact(new Object[] {"foo", "bar"}));
    }


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

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

                .from(String.class, String[].class)
                .spread(2)
                .invoke(target);
        
        assertEquals(MethodType.methodType(String.class, String[].class), handle.type());
        assertEquals("foobar", (String)handle.invokeExact(new String[] {"foo", "bar"}));
    }


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

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

                .from(String[].class, String.class, String.class, String.class)
                .collect(1, String[].class)
                .invokeStatic(LOOKUP, BinderTest.class, "varargs");


        assertEquals(MethodType.methodType(String[].class, String.class, String.class, String.class), handle.type());
        String[] ary = (String[])handle.invokeExact("one", "two", "three");
        assertEquals(2, ary.length);
        assertEquals("two", ary[0]);
        assertEquals("three", ary[1]);


        MethodHandle handle2 = Binder

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

                .from(Subjects.StringIntegerIntegerIntegerString.type())
                .collect(1, 3, Integer[].class)
                .invoke(Subjects.StringIntegersStringHandle);


        assertEquals(MethodType.methodType(String.class, String.class, Integer.class, Integer.class, Integer.class, String.class), handle2.type());
        assertEquals("[foo, [1, 2, 3], bar]", (String)handle2.invokeExact("foo", new Integer(1), new Integer(2), new Integer(3), "bar"));
    }


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

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

                .from(String[].class, String.class, String.class, String.class)
                .varargs(1, String[].class)
                .invokeStatic(LOOKUP, BinderTest.class, "varargs");


        assertEquals(MethodType.methodType(String[].class, String.class, String.class, String.class), handle.type());
        String[] ary = (String[])handle.invokeExact("one", "two", "three");
        assertEquals(2, ary.length);
        assertEquals("two", ary[0]);
        assertEquals("three", ary[1]);
    }

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

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


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


    @Test
    public void testConstant2() throws Throwable {
        MethodHandle handle = Binder

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