IoBuffer: Support prepending data
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Key: DIRMINA-507
URL: https://issues.apache.org/jira/browse/DIRMINA-507
Project: MINA
Issue Type: New Feature
Components: Core
Reporter: David M. Lloyd
Priority: Minor
I'd like to see IoBuffer enhanced to support prepending data. It could work as
follows:
* A means to specificy or reserve space should be provided. An
IoBuffer.reserve() method could do the trick, and maybe a 3-parameter version
of IoBuffer. IoBuffer.reserve() would keep the position at zero, but decrease
the capacity and limit by the given number of bytes, and move the buffer start
up by the given number of bytes.
* A means to reclaim the space must be provided. An IoBuffer.reclaim() would
work by moving the buffer start back down by the given amount, maybe returning
a slice to the recovered area. Or another alternative would be to have a
series of prepend* methods which would prepend bytes/ints/etc. similar to
put*(), but rather than adding to the end of the buffer, they would add to the
beginning, moving the buffer start back down to the start of the just-written
data. Though I'm not sure how helpful it would be to add another dozen methods
to a class that already has probably over a hundred methods.
* Care should be taken that the mechanism to prepend data does not allow a user
to "escape" a buffer slice.
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