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#ifdef USE_PRAGMA_INTERFACE #pragma interface /* gcc class implementation */ #endif .. typedef struct st_spartan_share { char *table_name; uint table_name_length,use_count; pthread_mutex_t mutex; THR_LOCK lock; Spartan_data *data_class; Spartan_index *index_class; } SPARTAN_SHARE; While you have the header file open, there are a few other changes that need to be made You have to add flags to tell the optimizer what index operations are supported You also have to set the boundaries for the index parameters: the maximum number of keys supported, the maximum length of the keys, and the maximum key parts For this stage, set the parameters as shown in Listing 7-36 I ve included the entire set of changes you need to make to the file Notice the table_flags() method This is where you tell the optimizer what limitations the storage engine has I have set the engine to disallow BLOBs and not permit auto-increment fields.

The Current property simply returns a reference to the child object corresponding to the current value of index. Of course, index is pointing to an item in the sorted list, and so that value must be cross-referenced back to an item in the original collection. This is the same as in the indexer property earlier: public T Current { get { return _list[_sortIndex[index].BaseIndex]; } } Object System.Collections.IEnumerator.Current { get { return _list[_sortIndex[index].BaseIndex]; } } Because SortedEnumerator implements IEnumerator<T>, it actually has two Current properties, one strongly typed for IEnumerator<T> itself and the other loosely typed for IEnumerator (from which IEnumerator<T> inherits). Both do the same thing, using the _index value to find the appropriate ListItem object in the sorted list, and then using the BaseIndex property of ListItem to retrieve the corresponding item in the original collection. That child object is then returned as a result.

A complete list of these flags can be found in handlerh Listing 7-36 Changes to the ha_spartan Class Definition in ha_spartanh const char *index_type(uint inx) { return "Spartan_index class"; } const char **bas_ext() const; .. ulong table_flags() const { return (HA_NO_BLOBS | HA_NO_AUTO_INCREMENT); } .. ulong index_flags(uint inx, uint part, bool all_parts) const { return (HA_READ_NEXT | HA_READ_PREV | HA_READ_RANGE | HA_READ_ORDER | HA_KEYREAD_ONLY); } .. uint max_supported_keys() const { return 1; } uint max_supported_key_parts() const { return 1; } uint max_supported_key_length() const { return 128; } There is one last thing that needs to be added Identifying the key in a record turns out to be easy but not very intuitive To make things easier to work with, I ve written two helper methods: get_key(), which finds the key field and returns its value or 0 if there are no keys, and get_key_len(), which returns the length of the key.

Collection objects must implement a GetEnumerator() method. This is required by the IEnumerable interface, which is the most basic interface for collection or list objects in the .NET Framework. In the case of SortedBindingList, both strongly typed and loosely typed GetEnumerator() methods must be implemented: public IEnumerator<T> GetEnumerator() { if (_sorted) return new SortedEnumerator(_list, _sortIndex, _sortOrder); else return _list.GetEnumerator(); } IEnumerator System.Collections.IEnumerable.GetEnumerator() { return GetEnumerator(); } These methods merely return an instance of an enumerator object for use by foreach statements that wish to iterate through the items in the collection. If the view is not currently sorted, then it can simply ask the original collection for its enumerator. The original collection s enumerator will already iterate through all the child objects in the collection in their original order: return _list.GetEnumerator(); On the other hand, if a sort has been applied, then an instance of the custom SortedEnumerator (implemented in the preceding code) is returned: return new SortedEnumerator(_list, _sortIndex, _sortOrder); Either way, the compiler generated code for the foreach statement has an enumerator object that iterates through the items in the collection.

Once we apply these changes and refresh preference management on our test machine (we can use mcxrefresh, or just restart), we should see that a user can now change which folders are synced as part of the Home Sync, as shown in Figure 12-13. Note that when Only selected folders is chosen, that Library is selected, but disabled. This is because the Library folder is part of the managed Preferences Sync, and so the user cannot modify synchronization for that folder. Note also that the Mobile Account Preferences dialog does not display the exception list. This can lead to user confusion. If you were to add ~/Pictures to the exclusion list, the contents of the user s Pictures folder would not be synced with the network home. Yet there would be no indication of this in the Mobile Account Preferences dialog. The user could choose to sync the home folder, or a set of specific folders including the Pictures folder, yet the invisible-to-the-end-user exclusion list would cause the Pictures folder to be excluded from synchronization. For this reason, you should be careful about adding items to the exclusion list that could cause confusion or possible data loss.

Add their definitions to the class header file (ha_spartanh) as shown here:.