3308 * If the requested type is primitive, widening primitive conversions are attempted,
3309 * else reference conversions are attempted.
3310 * <p>The returned method handle is equivalent to {@code identity(type).bindTo(value)}.
3311 * @param type the return type of the desired method handle
3312 * @param value the value to return
3313 * @return a method handle of the given return type and no arguments, which always returns the given value
3314 * @throws NullPointerException if the {@code type} argument is null
3315 * @throws ClassCastException if the value cannot be converted to the required return type
3316 * @throws IllegalArgumentException if the given type is {@code void.class}
3317 */
3318 public static
3319 MethodHandle constant(Class<?> type, Object value) {
3320 if (type.isPrimitive()) {
3321 if (type == void.class)
3322 throw newIllegalArgumentException("void type");
3323 Wrapper w = Wrapper.forPrimitiveType(type);
3324 value = w.convert(value, type);
3325 if (w.zero().equals(value))
3326 return zero(w, type);
3327 return insertArguments(identity(type), 0, value);
3328 } else {
3329 if (value == null)
3330 return zero(Wrapper.OBJECT, type);
3331 return identity(type).bindTo(value);
3332 }
3333 }
3334
3335 /**
3336 * Produces a method handle which returns its sole argument when invoked.
3337 * @param type the type of the sole parameter and return value of the desired method handle
3338 * @return a unary method handle which accepts and returns the given type
3339 * @throws NullPointerException if the argument is null
3340 * @throws IllegalArgumentException if the given type is {@code void.class}
3341 */
3342 public static
3343 MethodHandle identity(Class<?> type) {
3344 Wrapper btw = (type.isPrimitive() ? Wrapper.forPrimitiveType(type) : Wrapper.OBJECT);
3345 int pos = btw.ordinal();
3346 MethodHandle ident = IDENTITY_MHS[pos];
3347 if (ident == null) {
|
3308 * If the requested type is primitive, widening primitive conversions are attempted,
3309 * else reference conversions are attempted.
3310 * <p>The returned method handle is equivalent to {@code identity(type).bindTo(value)}.
3311 * @param type the return type of the desired method handle
3312 * @param value the value to return
3313 * @return a method handle of the given return type and no arguments, which always returns the given value
3314 * @throws NullPointerException if the {@code type} argument is null
3315 * @throws ClassCastException if the value cannot be converted to the required return type
3316 * @throws IllegalArgumentException if the given type is {@code void.class}
3317 */
3318 public static
3319 MethodHandle constant(Class<?> type, Object value) {
3320 if (type.isPrimitive()) {
3321 if (type == void.class)
3322 throw newIllegalArgumentException("void type");
3323 Wrapper w = Wrapper.forPrimitiveType(type);
3324 value = w.convert(value, type);
3325 if (w.zero().equals(value))
3326 return zero(w, type);
3327 return insertArguments(identity(type), 0, value);
3328 } else if (MinimalValueTypes_1_0.isValueType(type)) {
3329 return insertArguments(identity(type), 0, value);
3330 } else {
3331 if (value == null)
3332 return zero(Wrapper.OBJECT, type);
3333 return identity(type).bindTo(value);
3334 }
3335 }
3336
3337 /**
3338 * Produces a method handle which returns its sole argument when invoked.
3339 * @param type the type of the sole parameter and return value of the desired method handle
3340 * @return a unary method handle which accepts and returns the given type
3341 * @throws NullPointerException if the argument is null
3342 * @throws IllegalArgumentException if the given type is {@code void.class}
3343 */
3344 public static
3345 MethodHandle identity(Class<?> type) {
3346 Wrapper btw = (type.isPrimitive() ? Wrapper.forPrimitiveType(type) : Wrapper.OBJECT);
3347 int pos = btw.ordinal();
3348 MethodHandle ident = IDENTITY_MHS[pos];
3349 if (ident == null) {
|