/** Return the declared type of this member, which must be a method or constructor. */
public MethodType getMethodType() {
if (type == null) {
expandFromVM();
if (type == null) return null;
}
if (!isInvocable()) throw newIllegalArgumentException("not invocable, no method type");
if (type instanceof MethodType) {
return (MethodType) type;
}
if (type instanceof String) {
String sig = (String) type;
MethodType res = MethodType.fromMethodDescriptorString(sig, getClassLoader());
this.type = res;
return res;
}
if (type instanceof Object[]) {
Object[] typeInfo = (Object[]) type;
Class<?>[] ptypes = (Class<?>[]) typeInfo[1];
Class<?> rtype = (Class<?>) typeInfo[0];
MethodType res = MethodType.methodType(rtype, ptypes);
this.type = res;
return res;
}
throw new InternalError("bad method type " + type);
}
/**
* Sole factory method to find or create an interned method type.
*
* @param rtype desired return type
* @param ptypes desired parameter types
* @param trusted whether the ptypes can be used without cloning
* @return the unique method type of the desired structure
*/
/*trusted*/ static MethodType makeImpl(Class<?> rtype, Class<?>[] ptypes, boolean trusted) {
if (ptypes.length == 0) {
ptypes = NO_PTYPES;
trusted = true;
}
MethodType mt1 = new MethodType(rtype, ptypes);
MethodType mt0;
synchronized (internTable) {
mt0 = internTable.get(mt1);
if (mt0 != null) return mt0;
}
if (!trusted)
// defensively copy the array passed in by the user
mt1 = new MethodType(rtype, ptypes.clone());
// promote the object to the Real Thing, and reprobe
MethodTypeForm form = MethodTypeForm.findForm(mt1);
mt1.form = form;
if (form.erasedType == mt1) {
// This is a principal (erased) type; show it to the JVM.
MethodHandleNatives.init(mt1);
}
synchronized (internTable) {
mt0 = internTable.get(mt1);
if (mt0 != null) return mt0;
internTable.put(mt1, mt1);
}
return mt1;
}
/*non-public*/
boolean isConvertibleTo(MethodType newType) {
if (!canConvert(returnType(), newType.returnType())) return false;
int argc = parameterCount();
if (argc != newType.parameterCount()) return false;
for (int i = 0; i < argc; i++) {
if (!canConvert(newType.parameterType(i), parameterType(i))) return false;
}
return true;
}
private static MethodType unwrapWithNoPrims(MethodType wt) {
assert (!wt.hasPrimitives());
MethodType uwt = wt.wrapAlt;
if (uwt == null) {
// fill in lazily
uwt = MethodTypeForm.canonicalize(wt, MethodTypeForm.UNWRAP, MethodTypeForm.UNWRAP);
if (uwt == null) uwt = wt; // type has no wrappers or prims at all
wt.wrapAlt = uwt;
}
return uwt;
}
private static MethodType wrapWithPrims(MethodType pt) {
assert (pt.hasPrimitives());
MethodType wt = pt.wrapAlt;
if (wt == null) {
// fill in lazily
wt = MethodTypeForm.canonicalize(pt, MethodTypeForm.WRAP, MethodTypeForm.WRAP);
assert (wt != null);
pt.wrapAlt = wt;
}
return wt;
}
/**
* Return the declared type of this member, which must be a field or type. If it is a type member,
* that type itself is returned.
*/
public Class<?> getFieldType() {
if (type == null) {
expandFromVM();
if (type == null) return null;
}
if (isInvocable())
throw newIllegalArgumentException("not a field or nested class, no simple type");
if (type instanceof Class<?>) {
return (Class<?>) type;
}
if (type instanceof String) {
String sig = (String) type;
MethodType mtype = MethodType.fromMethodDescriptorString("()" + sig, getClassLoader());
Class<?> res = mtype.returnType();
this.type = res;
return res;
}
throw new InternalError("bad field type " + type);
}
/**
* Return the actual type under which this method or constructor must be invoked. For non-static
* methods or constructors, this is the type with a leading parameter, a reference to declaring
* class. For static methods, it is the same as the declared type.
*/
public MethodType getInvocationType() {
MethodType itype = getMethodType();
if (!isStatic()) itype = itype.insertParameterTypes(0, clazz);
return itype;
}