Java Code Examples for sun.invoke.util.Wrapper#isWrapperType()
The following examples show how to use
sun.invoke.util.Wrapper#isWrapperType() .
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Example 1
| Source File: InvokerBytecodeGenerator.java From jdk1.8-source-analysis with Apache License 2.0 | 6 votes |
|
private void emitPushArgument(Class<?> ptype, Object arg) {
BasicType bptype = basicType(ptype);
if (arg instanceof Name) {
Name n = (Name) arg;
emitLoadInsn(n.type, n.index());
emitImplicitConversion(n.type, ptype, n);
} else if ((arg == null || arg instanceof String) && bptype == L_TYPE) {
emitConst(arg);
} else {
if (Wrapper.isWrapperType(arg.getClass()) && bptype != L_TYPE) {
emitConst(arg);
} else {
mv.visitLdcInsn(constantPlaceholder(arg));
emitImplicitConversion(L_TYPE, ptype, arg);
}
}
}
Example 2
| Source File: InvokerBytecodeGenerator.java From openjdk-jdk9 with GNU General Public License v2.0 | 6 votes |
|
private void emitPushArgument(Class<?> ptype, Object arg) {
BasicType bptype = basicType(ptype);
if (arg instanceof Name) {
Name n = (Name) arg;
emitLoadInsn(n.type, n.index());
emitImplicitConversion(n.type, ptype, n);
} else if ((arg == null || arg instanceof String) && bptype == L_TYPE) {
emitConst(arg);
} else {
if (Wrapper.isWrapperType(arg.getClass()) && bptype != L_TYPE) {
emitConst(arg);
} else {
mv.visitLdcInsn(constantPlaceholder(arg));
emitImplicitConversion(L_TYPE, ptype, arg);
}
}
}
Example 3
| Source File: InvokerBytecodeGenerator.java From dragonwell8_jdk with GNU General Public License v2.0 | 6 votes |
|
private void emitPushArgument(Class<?> ptype, Object arg) {
BasicType bptype = basicType(ptype);
if (arg instanceof Name) {
Name n = (Name) arg;
emitLoadInsn(n.type, n.index());
emitImplicitConversion(n.type, ptype, n);
} else if ((arg == null || arg instanceof String) && bptype == L_TYPE) {
emitConst(arg);
} else {
if (Wrapper.isWrapperType(arg.getClass()) && bptype != L_TYPE) {
emitConst(arg);
} else {
mv.visitLdcInsn(constantPlaceholder(arg));
emitImplicitConversion(L_TYPE, ptype, arg);
}
}
}
Example 4
| Source File: InvokerBytecodeGenerator.java From jdk8u_jdk with GNU General Public License v2.0 | 6 votes |
|
private void emitPushArgument(Class<?> ptype, Object arg) {
BasicType bptype = basicType(ptype);
if (arg instanceof Name) {
Name n = (Name) arg;
emitLoadInsn(n.type, n.index());
emitImplicitConversion(n.type, ptype, n);
} else if ((arg == null || arg instanceof String) && bptype == L_TYPE) {
emitConst(arg);
} else {
if (Wrapper.isWrapperType(arg.getClass()) && bptype != L_TYPE) {
emitConst(arg);
} else {
mv.visitLdcInsn(constantPlaceholder(arg));
emitImplicitConversion(L_TYPE, ptype, arg);
}
}
}
Example 5
| Source File: InvokerBytecodeGenerator.java From TencentKona-8 with GNU General Public License v2.0 | 6 votes |
|
private void emitPushArgument(Class<?> ptype, Object arg) {
BasicType bptype = basicType(ptype);
if (arg instanceof Name) {
Name n = (Name) arg;
emitLoadInsn(n.type, n.index());
emitImplicitConversion(n.type, ptype, n);
} else if ((arg == null || arg instanceof String) && bptype == L_TYPE) {
emitConst(arg);
} else {
if (Wrapper.isWrapperType(arg.getClass()) && bptype != L_TYPE) {
emitConst(arg);
} else {
mv.visitLdcInsn(constantPlaceholder(arg));
emitImplicitConversion(L_TYPE, ptype, arg);
}
}
}
Example 6
| Source File: InvokerBytecodeGenerator.java From jdk8u-dev-jdk with GNU General Public License v2.0 | 6 votes |
|
private void emitPushArgument(Class<?> ptype, Object arg) {
BasicType bptype = basicType(ptype);
if (arg instanceof Name) {
Name n = (Name) arg;
emitLoadInsn(n.type, n.index());
emitImplicitConversion(n.type, ptype, n);
} else if ((arg == null || arg instanceof String) && bptype == L_TYPE) {
emitConst(arg);
} else {
if (Wrapper.isWrapperType(arg.getClass()) && bptype != L_TYPE) {
emitConst(arg);
} else {
mv.visitLdcInsn(constantPlaceholder(arg));
emitImplicitConversion(L_TYPE, ptype, arg);
}
}
}
Example 7
| Source File: InvokerBytecodeGenerator.java From jdk8u60 with GNU General Public License v2.0 | 6 votes |
|
private void emitPushArgument(Class<?> ptype, Object arg) {
BasicType bptype = basicType(ptype);
if (arg instanceof Name) {
Name n = (Name) arg;
emitLoadInsn(n.type, n.index());
emitImplicitConversion(n.type, ptype, n);
} else if ((arg == null || arg instanceof String) && bptype == L_TYPE) {
emitConst(arg);
} else {
if (Wrapper.isWrapperType(arg.getClass()) && bptype != L_TYPE) {
emitConst(arg);
} else {
mv.visitLdcInsn(constantPlaceholder(arg));
emitImplicitConversion(L_TYPE, ptype, arg);
}
}
}
Example 8
| Source File: InvokerBytecodeGenerator.java From Bytecoder with Apache License 2.0 | 6 votes |
|
private void emitPushArgument(Class<?> ptype, Object arg) {
BasicType bptype = basicType(ptype);
if (arg instanceof Name) {
Name n = (Name) arg;
emitLoadInsn(n.type, n.index());
emitImplicitConversion(n.type, ptype, n);
} else if ((arg == null || arg instanceof String) && bptype == L_TYPE) {
emitConst(arg);
} else {
if (Wrapper.isWrapperType(arg.getClass()) && bptype != L_TYPE) {
emitConst(arg);
} else {
mv.visitLdcInsn(constantPlaceholder(arg));
emitImplicitConversion(L_TYPE, ptype, arg);
}
}
}
Example 9
| Source File: InvokerBytecodeGenerator.java From openjdk-8-source with GNU General Public License v2.0 | 6 votes |
|
private void emitPushArgument(Name name, int paramIndex) {
Object arg = name.arguments[paramIndex];
char ptype = name.function.parameterType(paramIndex);
MethodType mtype = name.function.methodType();
if (arg instanceof Name) {
Name n = (Name) arg;
emitLoadInsn(n.type, n.index());
emitImplicitConversion(n.type, mtype.parameterType(paramIndex));
} else if ((arg == null || arg instanceof String) && ptype == 'L') {
emitConst(arg);
} else {
if (Wrapper.isWrapperType(arg.getClass()) && ptype != 'L') {
emitConst(arg);
} else {
mv.visitLdcInsn(constantPlaceholder(arg));
emitImplicitConversion('L', mtype.parameterType(paramIndex));
}
}
}
Example 10
| Source File: InvokerBytecodeGenerator.java From jdk8u-jdk with GNU General Public License v2.0 | 6 votes |
|
private void emitPushArgument(Class<?> ptype, Object arg) {
BasicType bptype = basicType(ptype);
if (arg instanceof Name) {
Name n = (Name) arg;
emitLoadInsn(n.type, n.index());
emitImplicitConversion(n.type, ptype, n);
} else if ((arg == null || arg instanceof String) && bptype == L_TYPE) {
emitConst(arg);
} else {
if (Wrapper.isWrapperType(arg.getClass()) && bptype != L_TYPE) {
emitConst(arg);
} else {
mv.visitLdcInsn(constantPlaceholder(arg));
emitImplicitConversion(L_TYPE, ptype, arg);
}
}
}
Example 11
| Source File: InvokerBytecodeGenerator.java From openjdk-jdk8u with GNU General Public License v2.0 | 6 votes |
|
private void emitPushArgument(Class<?> ptype, Object arg) {
BasicType bptype = basicType(ptype);
if (arg instanceof Name) {
Name n = (Name) arg;
emitLoadInsn(n.type, n.index());
emitImplicitConversion(n.type, ptype, n);
} else if ((arg == null || arg instanceof String) && bptype == L_TYPE) {
emitConst(arg);
} else {
if (Wrapper.isWrapperType(arg.getClass()) && bptype != L_TYPE) {
emitConst(arg);
} else {
mv.visitLdcInsn(constantPlaceholder(arg));
emitImplicitConversion(L_TYPE, ptype, arg);
}
}
}
Example 12
| Source File: InvokerBytecodeGenerator.java From openjdk-8 with GNU General Public License v2.0 | 6 votes |
|
private void emitPushArgument(Name name, int paramIndex) {
Object arg = name.arguments[paramIndex];
char ptype = name.function.parameterType(paramIndex);
MethodType mtype = name.function.methodType();
if (arg instanceof Name) {
Name n = (Name) arg;
emitLoadInsn(n.type, n.index());
emitImplicitConversion(n.type, mtype.parameterType(paramIndex));
} else if ((arg == null || arg instanceof String) && ptype == 'L') {
emitConst(arg);
} else {
if (Wrapper.isWrapperType(arg.getClass()) && ptype != 'L') {
emitConst(arg);
} else {
mv.visitLdcInsn(constantPlaceholder(arg));
emitImplicitConversion('L', mtype.parameterType(paramIndex));
}
}
}
Example 13
| Source File: MethodType.java From jdk8u-jdk with GNU General Public License v2.0 | 4 votes |
|
static boolean canConvert(Class<?> src, Class<?> dst) {
// short-circuit a few cases:
if (src == dst || src == Object.class || dst == Object.class) return true;
// 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:
// Object -> cast:Integer -> unbox:int -> long/float/double
// Serializable -> cast:Byte -> unbox:byte -> byte/short/int/long/float/double
// An marginal case is Number -> dw:Character -> char, which would be OK if there were a
// subclass of Number which wraps a value that can convert to char.
// Since there is none, we don't need an extra check here to cover char or boolean.
return false;
} else {
// R->R always works, since null is always valid dynamically
return true;
}
}
Example 14
| Source File: MethodType.java From jdk1.8-source-analysis with Apache License 2.0 | 4 votes |
|
static boolean canConvert(Class<?> src, Class<?> dst) {
// short-circuit a few cases:
if (src == dst || src == Object.class || dst == Object.class) return true;
// 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:
// Object -> cast:Integer -> unbox:int -> long/float/double
// Serializable -> cast:Byte -> unbox:byte -> byte/short/int/long/float/double
// An marginal case is Number -> dw:Character -> char, which would be OK if there were a
// subclass of Number which wraps a value that can convert to char.
// Since there is none, we don't need an extra check here to cover char or boolean.
return false;
} else {
// R->R always works, since null is always valid dynamically
return true;
}
}
Example 15
| Source File: MethodType.java From jdk8u-dev-jdk with GNU General Public License v2.0 | 4 votes |
|
static boolean canConvert(Class<?> src, Class<?> dst) {
// short-circuit a few cases:
if (src == dst || src == Object.class || dst == Object.class) return true;
// 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:
// Object -> cast:Integer -> unbox:int -> long/float/double
// Serializable -> cast:Byte -> unbox:byte -> byte/short/int/long/float/double
// An marginal case is Number -> dw:Character -> char, which would be OK if there were a
// subclass of Number which wraps a value that can convert to char.
// Since there is none, we don't need an extra check here to cover char or boolean.
return false;
} else {
// R->R always works, since null is always valid dynamically
return true;
}
}
Example 16
| Source File: MethodType.java From jdk8u-jdk with GNU General Public License v2.0 | 4 votes |
|
static boolean canConvert(Class<?> src, Class<?> dst) {
// short-circuit a few cases:
if (src == dst || src == Object.class || dst == Object.class) return true;
// 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:
// Object -> cast:Integer -> unbox:int -> long/float/double
// Serializable -> cast:Byte -> unbox:byte -> byte/short/int/long/float/double
// An marginal case is Number -> dw:Character -> char, which would be OK if there were a
// subclass of Number which wraps a value that can convert to char.
// Since there is none, we don't need an extra check here to cover char or boolean.
return false;
} else {
// R->R always works, since null is always valid dynamically
return true;
}
}
Example 17
| Source File: MethodType.java From openjdk-8 with GNU General Public License v2.0 | 4 votes |
|
static boolean canConvert(Class<?> src, Class<?> dst) {
// short-circuit a few cases:
if (src == dst || dst == Object.class) return true;
// 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:
// Object -> cast:Integer -> unbox:int -> long/float/double
// Serializable -> cast:Byte -> unbox:byte -> byte/short/int/long/float/double
// An marginal case is Number -> dw:Character -> char, which would be OK if there were a
// subclass of Number which wraps a value that can convert to char.
// Since there is none, we don't need an extra check here to cover char or boolean.
return false;
} else {
// R->R always works, since null is always valid dynamically
return true;
}
}
Example 18
| Source File: MethodType.java From jdk8u60 with GNU General Public License v2.0 | 4 votes |
|
static boolean canConvert(Class<?> src, Class<?> dst) {
// short-circuit a few cases:
if (src == dst || src == Object.class || dst == Object.class) return true;
// 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:
// Object -> cast:Integer -> unbox:int -> long/float/double
// Serializable -> cast:Byte -> unbox:byte -> byte/short/int/long/float/double
// An marginal case is Number -> dw:Character -> char, which would be OK if there were a
// subclass of Number which wraps a value that can convert to char.
// Since there is none, we don't need an extra check here to cover char or boolean.
return false;
} else {
// R->R always works, since null is always valid dynamically
return true;
}
}
Example 19
| Source File: MethodType.java From dragonwell8_jdk with GNU General Public License v2.0 | 4 votes |
|
static boolean canConvert(Class<?> src, Class<?> dst) {
// short-circuit a few cases:
if (src == dst || src == Object.class || dst == Object.class) return true;
// 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:
// Object -> cast:Integer -> unbox:int -> long/float/double
// Serializable -> cast:Byte -> unbox:byte -> byte/short/int/long/float/double
// An marginal case is Number -> dw:Character -> char, which would be OK if there were a
// subclass of Number which wraps a value that can convert to char.
// Since there is none, we don't need an extra check here to cover char or boolean.
return false;
} else {
// R->R always works, since null is always valid dynamically
return true;
}
}
Example 20
| Source File: MethodType.java From AndroidComponentPlugin with Apache License 2.0 | 4 votes |
|
static boolean canConvert(Class<?> src, Class<?> dst) {
// short-circuit a few cases:
if (src == dst || src == Object.class || dst == Object.class) return true;
// 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:
// Object -> cast:Integer -> unbox:int -> long/float/double
// Serializable -> cast:Byte -> unbox:byte -> byte/short/int/long/float/double
// An marginal case is Number -> dw:Character -> char, which would be OK if there were a
// subclass of Number which wraps a value that can convert to char.
// Since there is none, we don't need an extra check here to cover char or boolean.
return false;
} else {
// R->R always works, since null is always valid dynamically
return true;
}
}
