DocumentFilter
, as the name implies, is a filter for the
Document
mutation methods. When a
Document
containing a
DocumentFilter
is modified (either through
insert
or
remove
), it forwards the appropriate method invocation to the
DocumentFilter
. The default implementation allows the modification to occur. Subclasses can filter the modifications by conditionally invoking methods on the superclass, or invoking the necessary methods on the passed in
FilterBypass
. Subclasses should NOT call back into the Document for the modification instead call into the superclass or the
FilterBypass
.
When remove or insertString is invoked on the DocumentFilter, the DocumentFilter may callback into the FilterBypass multiple times, or for different regions, but it should not callback into the FilterBypass after returning from the remove or insertString method.
By default, text related document mutation methods such as insertString, replace and remove in AbstractDocument use DocumentFilter when available, and Element related mutation methods such as create, insert and removeElement in DefaultStyledDocument do not use DocumentFilter. If a method doesn't follow these defaults, this must be explicitly stated in the method documentation.
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