static int appendMethodSignature(Class[] argTypes, Class returnType, StringBuffer sb) {
sb.append('(');
int firstLocal = 1 + argTypes.length; // includes this.
for (int i = 0; i < argTypes.length; i++) {
Class type = argTypes[i];
appendTypeString(sb, type);
if (type == Long.TYPE || type == Double.TYPE) {
// adjust for duble slot
++firstLocal;
}
}
sb.append(')');
appendTypeString(sb, returnType);
return firstLocal;
}
private static StringBuffer appendTypeString(StringBuffer sb, Class type) {
while (type.isArray()) {
sb.append('[');
type = type.getComponentType();
}
if (type.isPrimitive()) {
char typeLetter;
if (type == Boolean.TYPE) {
typeLetter = 'Z';
} else if (type == Long.TYPE) {
typeLetter = 'J';
} else {
String typeName = type.getName();
typeLetter = Character.toUpperCase(typeName.charAt(0));
}
sb.append(typeLetter);
} else {
sb.append('L');
sb.append(type.getName().replace('.', '/'));
sb.append(';');
}
return sb;
}