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From "Niall Pemberton (JIRA)" <j...@apache.org>
Subject [jira] Updated: (IO-137) Added method for getting InputStream from ByteArrayOutputStream & IOUtils avoiding unnecessary array allocation and copy
Date Wed, 05 Dec 2007 16:46:43 GMT

     [ https://issues.apache.org/jira/browse/IO-137?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Niall Pemberton updated IO-137:
-------------------------------

        Fix Version/s:     (was: AFTER-1.4)
                           (was: 1.3.2)
    Affects Version/s:     (was: 1.4)
                           (was: AFTER-1.4)

> Added method for getting InputStream from ByteArrayOutputStream & IOUtils avoiding
unnecessary array allocation and copy
> ------------------------------------------------------------------------------------------------------------------------
>
>                 Key: IO-137
>                 URL: https://issues.apache.org/jira/browse/IO-137
>             Project: Commons IO
>          Issue Type: New Feature
>          Components: Streams/Writers, Utilities
>    Affects Versions: 1.3.2
>         Environment: Any OS with appropriate JVM
>            Reporter: Nikunj Trivedi
>             Fix For: 1.4
>
>         Attachments: baos_toIstream.patch
>
>
> Patch inclues following two methods and test cases for both.
> 1) New Method: ByteArrayOutputStream.toInputStream
> ByteArrayOutputStream exposes its byte buffers by toByteArray(), which creates a fresh
buffer and copy existing data to it.
> A new method toInputStream() available in patch returns the current contents of baos,
as an InputStream, avoiding unnecessary allocation and copying.
> 2) New Method: IOUtils.toFullyBufferedInputStream
> There are situations where the InputStream source is available and it has to be passed
to different modules for processing.
> It is needed to fetch the full contents of the InputStream in internal buffer(IOUtils.toByteArray()
), convert this buffer to ByteArrayInputStream and use that stream instead. But this is wasteful
since toByteArray() requires one fresh allocation and copy operation.
> New method copies InputStream to ByteArrayOutputStream and returns baos.toInputStream(),
avoiding unnecessary memory allocation and copy.
> Testcases are available in respective classes.

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