Clipboard

1
implements
Clipboard Item retrieve () Item retrieveNth
(int n) Item retrieve (DataType type) Item
retrieveNth (int n, DataType type) void clear
() void insert (Item item) Enumeration types
() Stack contents
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Critical Evaluation of Version 1.0

1. Components that use IClipboard must know about
   the Item and DataType class. Specifically, the
   constructor for Item and DataType must be
   available
2. The behavior of the clipboard is actually quite a
   bit different from a Stack! First, it can be
   cleared. Second, one can retrieve an item from
   deep within the stack. Third, when a paste
   operation occurs, the stack is not changed.

3
Clipboard implements IBlock IItem retrieve ()
IItem retrieveNth (int n) IItem retrieve
(IDataType type) IItem retrieveNth (int n,
IDataType type) void clear () void insert
(IItem item) Enumeration types () Item
newItemInstance (IDataType type, Object obj)
IDataType newDataTypeInstance (String s)
Clipboard () activate () boolean connect
(IBlock ib, String interfaceName) deactivate
() Enumeration getProvided() Enumeration
getRequired() Stack contents Vector
providedV, requiredV
implements
1
implements
1
implements
1
1 1
4
Critical Evaluation of Version 1.1

1. Should we be worried about the unbounded nature
   of the clipboard? What if very-large depth is
   reached?
2. Can we provide a standard GUI interface to the
   clipboard much like Microsoft-office does with
   its latest Office Clipboard

5
implements
implements
extends
3
implements
1
1
implements
1
1 1
1
1
1
6
Critical Evaluation of Version 1.2

1. Ensure backward compatibility with earlier
   versions because IClipboard was not altered
2. GUI usage will be inferred when setAccessor() or
   showClipboard() is invoked.