Examples of sun.invoke.util.Wrapper

sun.invoke.util.Wrapper

        // the remainder of this logic is documented in MethodHandle.asType
        if (src.isPrimitive()) {
            // can force void to an explicit null, a la reflect.Method.invoke
            // can also force void to a primitive zero, by analogy
            if (src == void.class)  return true;  //or !dst.isPrimitive()?
            Wrapper sw = Wrapper.forPrimitiveType(src);
            if (dst.isPrimitive()) {
                // P->P must widen
                return Wrapper.forPrimitiveType(dst).isConvertibleFrom(sw);
            } else {
                // P->R must box and widen
                return dst.isAssignableFrom(sw.wrapperType());
            }
        } else if (dst.isPrimitive()) {
            // any value can be dropped
            if (dst == void.class)  return true;
            Wrapper dw = Wrapper.forPrimitiveType(dst);
            // R->P must be able to unbox (from a dynamically chosen type) and widen
            // For example:
            //   Byte/Number/Comparable/Object -> dw:Byte -> byte.
            //   Character/Comparable/Object -> dw:Character -> char
            //   Boolean/Comparable/Object -> dw:Boolean -> boolean
            // This means that dw must be cast-compatible with src.
            if (src.isAssignableFrom(dw.wrapperType())) {
                return true;
            }
            // The above does not work if the source reference is strongly typed
            // to a wrapper whose primitive must be widened.  For example:
            //   Byte -> unbox:byte -> short/int/long/float/double
            //   Character -> unbox:char -> int/long/float/double
            if (Wrapper.isWrapperType(src) &&
                dw.isConvertibleFrom(Wrapper.forWrapperType(src))) {
                // can unbox from src and then widen to dst
                return true;
            }
            // We have already covered cases which arise due to runtime unboxing
            // of a reference type which covers several wrapper types:

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     */
    private static MethodHandle computeReturnConversion(
            MethodType targetType, MethodType internalType) {
        Class<?> tret = targetType.returnType();
        Class<?> iret = internalType.returnType();
        Wrapper wrap = Wrapper.forBasicType(tret);
        if (!iret.isPrimitive()) {
            assert(iret == Object.class);
            return ValueConversions.identity();
        } else if (wrap.primitiveType() == iret) {
            return ValueConversions.box(wrap);
        } else {
            assert(tret == double.class ? iret == long.class : iret == int.class);
            return ValueConversions.boxRaw(wrap);
        }

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            Wrapper.OBJECT.convert(value, t0);
            if (!prim1) {
                return Wrapper.OBJECT.convert(value, t1);
            }
            // convert reference to primitive by unboxing
            Wrapper w1 = Wrapper.forPrimitiveType(t1);
            return w1.convert(value, t1);
        }
        // check contract with caller:
        Wrapper.asWrapperType(t0).cast(value);
        Wrapper w1 = Wrapper.forPrimitiveType(t1);
        return w1.convert(value, t1);
    }

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    public static
    MethodHandle constant(Class<?> type, Object value) {
        if (type.isPrimitive()) {
            if (type == void.class)
                throw newIllegalArgumentException("void type");
            Wrapper w = Wrapper.forPrimitiveType(type);
            return insertArguments(identity(type), 0, w.convert(value, type));
        } else {
            return identity(type).bindTo(type.cast(value));
        }
    }

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    /** Can an primitive unboxing adapter validly convert src to dst? */
    static boolean canUnboxArgument(Class<?> src, Class<?> dst, int level) {
        assert(dst.isPrimitive());
        // if we have JVM support for boxing, we can also do complex unboxing
        if (convOpSupported(OP_PRIM_TO_REF))  return true;
        Wrapper dw = Wrapper.forPrimitiveType(dst);
        // Level 0 means cast and unbox.  This works on any reference.
        if (level == 0)  return !src.isPrimitive();
        assert(level >= 0 && level <= 2);
        // Levels 1 and 2 allow widening and/or narrowing conversions.
        // These are not supported directly by the JVM.
        // But if the input reference is monomorphic, we can do it.
        return dw.wrapperType() == src;
    }

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            Wrapper.OBJECT.convert(value, t0);
            if (!prim1) {
                return Wrapper.OBJECT.convert(value, t1);
            }
            // convert reference to primitive by unboxing
            Wrapper w1 = Wrapper.forPrimitiveType(t1);
            return w1.convert(value, t1);
        }
        // check contract with caller:
        Wrapper.asWrapperType(t0).cast(value);
        Wrapper w1 = Wrapper.forPrimitiveType(t1);
        return w1.convert(value, t1);
    }

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    public static
    MethodHandle constant(Class<?> type, Object value) {
        if (type.isPrimitive()) {
            if (type == void.class)
                throw newIllegalArgumentException("void type");
            Wrapper w = Wrapper.forPrimitiveType(type);
            return insertArguments(identity(type), 0, w.convert(value, type));
        } else {
            return identity(type).bindTo(type.cast(value));
        }
    }

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        MethodHandle retFilter = null;
        Class<?> oldRT = oldType.returnType();
        Class<?> newRT = newType.returnType();
        if (!VerifyType.isNullConversion(oldRT, newRT)) {
            if (oldRT == void.class) {
                Wrapper wrap = newRT.isPrimitive() ? Wrapper.forPrimitiveType(newRT) : Wrapper.OBJECT;
                retFilter = ValueConversions.zeroConstantFunction(wrap);
            } else {
                retFilter = MethodHandles.identity(newRT);
                retFilter = convertArguments(retFilter, retFilter.type().changeParameterType(0, oldRT), level);
            }

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        MethodHandle retFilter = null;
        Class<?> oldRT = oldType.returnType();
        Class<?> newRT = newType.returnType();
        if (!VerifyType.isNullConversion(oldRT, newRT)) {
            if (oldRT == void.class) {
                Wrapper wrap = newRT.isPrimitive() ? Wrapper.forPrimitiveType(newRT) : Wrapper.OBJECT;
                retFilter = ValueConversions.zeroConstantFunction(wrap);
            } else {
                retFilter = MethodHandles.identity(newRT);
                retFilter = convertArguments(retFilter, retFilter.type().changeParameterType(0, oldRT), level);
            }

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java.lang.invoke.BoundMethodHandle

java.lang.invoke.MethodTypeForm

java.lang.invoke.FromGeneric

java.lang.invoke.AbstractValidatingLambdaMetafactory

java.lang.invoke.LambdaForm

java.lang.invoke.DirectMethodHandle

java.lang.invoke.MethodType

java.lang.invoke.AdapterMethodHandle

java.lang.invoke.MethodHandleImpl

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