// does some consisitency check between the CA list and every CA attribute usage and after
// discarding unwanted CA return an array of them
static private Object[] CheckConsistencyAndCreateArray(CustomAttribute caItem, Type caType)
{
// we got the max number of attributes, we may have to trim this list but let's get a count for now
if (caItem == null)
{
return((caType == null || caType.IsValueType) ? s_gObjectEmptyArray : (Object[])Array.CreateInstance(caType, 0));
}
int caCount = 0;
int hasInherited = (caItem == null) ? 0 : caItem.m_inheritLevel;
CustomAttribute caNext = caItem;
CustomAttribute caPrev = null;
// walk and revert the list
while (caNext != null)
{
caCount++;
CustomAttribute caTemp = caNext.m_next;
caNext.m_next = caPrev;
caPrev = caNext;
caNext = caTemp;
}
caItem = caPrev;
// now we have a list of custom attribute of some type. That list may contain subtype of the specific
// type, so for every other type we have to go and check whether multiple and inherited are respected
if (caCount > 0 && hasInherited > 0)
{
// keep track of the CA types so we can make inspection reasonable fast
Hashtable htCAData = new Hashtable(11);
// loop through the list of attributes checking for consistency, once an attribute
// has been inspected is never going to be looked at again, and neither an attribute
// of the same type.
// This loop and the inspectedCATypes array should make that happen
caNext = caItem;
CustomAttribute caLast = null;
while (caNext != null)
{
AttributeUsageAttribute usage = null;
int caTypeLevelFound = 0;
// get current attribute type
Type t = caNext.GetAttributeType();
// look if the type has already been seen
CAData caData = (CAData)htCAData[t];
if (caData != null)
{
usage = caData.usage;
caTypeLevelFound = caData.level;
}
if (usage == null)
{
// no type found, load the attribute usage
// do not save the attribute usage yet because the next block may discard
// the attribute which implies we pretend we never saw. That is kind of
// bad because we may end up reloading it again if another type comes into the picture
// but we prefer the perf hit to more code complication for a case that seem to
// be submarginal
usage = CustomAttribute.GetAttributeUsage(t);
}
// if this is an inherited attribute and the attribute usage does not allow that, OR
// if the attribute was seen already on a different inheritance level and multiple is not allowed
// THEN discard
if ((caNext.m_inheritLevel > 0 && !usage.Inherited) ||
(caData != null && caTypeLevelFound < caNext.m_inheritLevel && !usage.AllowMultiple))
{
if (caLast == null)
{
caItem = caNext.m_next;
}
else
{
caLast.m_next = caNext.m_next;
}
caNext = caNext.m_next;
caCount--;
continue;
}
if (caData == null)
{
// the attribute was never seen so far so we should add it to the table and keep going
htCAData[t] = new CAData(t, usage, caNext.m_inheritLevel);
}
caLast = caNext;
caNext = caNext.m_next;
}
}
// time to return the array
if (caCount > 0)
{
if (caType == null || caType.IsValueType)
{
caType = s_ObjectType;
}
Object[] cas = (Object[])Array.CreateInstance(caType, caCount);
caNext = caItem;
for (int i = 0; i < caCount; i++)
{
cas[i] = caNext.GetObject();
caNext = caNext.m_next;
}
return(cas);
}
else
{
return((caType == null || caType.IsValueType) ? s_gObjectEmptyArray : (Object[])Array.CreateInstance(caType, 0));
}
}
// does some consisitency check between the CA list and every CA attribute usage and after
// discarding unwanted CA return an array of them
static private Object[] CheckConsistencyAndCreateArray(CustomAttribute caItem, Type caType) {
// we got the max number of attributes, we may have to trim this list but let's get a count for now
if (caItem == null)
return (caType == null || caType.IsValueType) ? s_gObjectEmptyArray : (Object[])Array.CreateInstance(caType, 0);
int caCount = 0;
int hasInherited = (caItem == null) ? 0 : caItem.m_inheritLevel;
CustomAttribute caNext = caItem;
CustomAttribute caPrev = null;
// walk and revert the list
while (caNext != null) {
caCount++;
CustomAttribute caTemp = caNext.m_next;
caNext.m_next = caPrev;
caPrev = caNext;
caNext = caTemp;
}
caItem = caPrev;
// now we have a list of custom attribute of some type. That list may contain subtype of the specific
// type, so for every other type we have to go and check whether multiple and inherited are respected
if (caCount > 0 && hasInherited > 0) {
// keep track of the CA types so we can make inspection reasonable fast
Hashtable htCAData = new Hashtable(11);
// loop through the list of attributes checking for consistency, once an attribute
// has been inspected is never going to be looked at again, and neither an attribute
// of the same type.
// This loop and the inspectedCATypes array should make that happen
caNext = caItem;
CustomAttribute caLast = null;
while (caNext != null) {
AttributeUsageAttribute usage = null;
int caTypeLevelFound = 0;
// get current attribute type
Type t = caNext.GetAttributeType();
// look if the type has already been seen
CAData caData = (CAData)htCAData[t];
if (caData != null) {
usage = caData.usage;
caTypeLevelFound = caData.level;
}
if (usage == null)
// no type found, load the attribute usage
// do not save the attribute usage yet because the next block may discard
// the attribute which implies we pretend we never saw. That is kind of
// bad because we may end up reloading it again if another type comes into the picture
// but we prefer the perf hit to more code complication for a case that seem to
// be submarginal
usage = CustomAttribute.GetAttributeUsage(t);
// if this is an inherited attribute and the attribute usage does not allow that, OR
// if the attribute was seen already on a different inheritance level and multiple is not allowed
// THEN discard
if ((caNext.m_inheritLevel > 0 && !usage.Inherited) ||
(caData != null && caTypeLevelFound < caNext.m_inheritLevel && !usage.AllowMultiple)) {
if (caLast == null)
caItem = caNext.m_next;
else
caLast.m_next = caNext.m_next;
caNext = caNext.m_next;
caCount--;
continue;
}
if (caData == null)
// the attribute was never seen so far so we should add it to the table and keep going
htCAData[t] = new CAData(t, usage, caNext.m_inheritLevel);
caLast = caNext;
caNext = caNext.m_next;
}
}
// time to return the array
if (caCount > 0) {
if (caType == null || caType.IsValueType)
caType = s_ObjectType;
Object[] cas = (Object[])Array.CreateInstance(caType, caCount);
caNext = caItem;
for (int i = 0; i < caCount; i++) {
cas[i] = caNext.GetObject();
caNext = caNext.m_next;
}
return cas;
}
else
return (caType == null || caType.IsValueType) ? s_gObjectEmptyArray : (Object[])Array.CreateInstance(caType, 0);
}
