Added method for getting InputStream from ByteArrayOutputStream & IOUtils
avoiding unnecessary array allocation and copy
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Key: IO-137
URL: https://issues.apache.org/jira/browse/IO-137
Project: Commons IO
Issue Type: New Feature
Components: Streams/Writers
Affects Versions: 1.3.2, 1.4, AFTER-1.4
Environment: Any OS with appropriate JVM
Reporter: Nikunj Trivedi
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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