Implemented high-level iteration code. Various fixes.

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@2666 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/storage/DiskDevice.h

@@ -50,6 +50,9 @@ public:
 	BPartition *VisitEachPartition(BDiskDeviceVisitor *visitor);
 	bool Traverse(BDiskDeviceVisitor *visitor);
 
+	BSession *SessionWithID(int32 id);
+	BPartition *PartitionWithID(int32 id);
+
 private:
 	BDiskDevice(const BDiskDevice &);
 	BDiskDevice &operator=(const BDiskDevice &);

headers/private/storage/DiskDeviceRoster.h

@@ -55,6 +55,9 @@ public:
 
 	bool VisitEachDevice(BDiskDeviceVisitor *visitor,
 						 BDiskDevice *device = NULL);
+	bool VisitEachSession(BDiskDeviceVisitor *visitor,
+						  BDiskDevice *device = NULL,
+						  BSession **session = NULL);
 	bool VisitEachPartition(BDiskDeviceVisitor *visitor,
 							BDiskDevice *device = NULL,
 							BPartition **partition = NULL);
@@ -81,6 +84,10 @@ public:
 						   uint32 eventMask = B_DEVICE_REQUEST_ALL);
 	status_t StopWatching(BMessenger target);
 
+private:
+	status_t _GetObjectWithID(const char *fieldName, int32 id,
+							  BDiskDevice *device) const;
+
 private:
 	BMessenger	fManager;
 	int32		fCookie;

headers/private/storage/DiskDeviceVisitor.h

@@ -12,6 +12,7 @@ class BSession;
 
 // BDiskDeviceVisitor
 class BDiskDeviceVisitor {
+public:
 	BDiskDeviceVisitor();
 	virtual ~BDiskDeviceVisitor();
 

headers/private/storage/Session.h

@@ -43,6 +43,8 @@ public:
 
 	BPartition *VisitEachPartition(BDiskDeviceVisitor *visitor);
 
+	BPartition *PartitionWithID(int32 id);
+
 	status_t GetPartitioningParameters(const char *partitioningSystem,
 									   BString *parameters,
 									   BPoint dialogCenter = BPoint(-1, -1),