Re: Appending data to file in a MemoryFileSystem.
But can't you construct a FileChannel from the FileOutputStream? I thought the question was how to seek on an output stream, which the example generates. On 9/19/2019 10:06 AM, Neil C Smith wrote: On Thu, 19 Sep 2019 at 17:03, William Reynolds wrote: From https://stackoverflow.com/questions/9558979/java-outputstream-skip-offset ... FileOutputStream out = new FileOutputStream(file); There is no File! ;-) Best wishes, Neil -- William Reynolds, Ph.D. Stellar Science, LLC wnreyno...@stellarscience.com www.stellarscience.com 877-763-8268 x710 (v) smime.p7s Description: S/MIME Cryptographic Signature
Re: Appending data to file in a MemoryFileSystem.
On Thu, 19 Sep 2019 at 17:03, William Reynolds wrote: > > From https://stackoverflow.com/questions/9558979/java-outputstream-skip-offset ... >FileOutputStream out = new FileOutputStream(file); There is no File! ;-) Best wishes, Neil - To unsubscribe, e-mail: users-unsubscr...@netbeans.apache.org For additional commands, e-mail: users-h...@netbeans.apache.org For further information about the NetBeans mailing lists, visit: https://cwiki.apache.org/confluence/display/NETBEANS/Mailing+lists
Re: Appending data to file in a MemoryFileSystem.
From
https://stackoverflow.com/questions/9558979/java-outputstream-skip-offset
|try{FileOutputStreamout =newFileOutputStream(file);try{FileChannelch
=out.getChannel();ch.position(offset);ch.write(ByteBuffer.wrap(data));}finally{out.close();}}catch(IOExceptionex){//
handle error}|
On 9/19/2019 8:02 AM, Richard Linsdale wrote:
Hopefully somebody can help direct me to a solution to this problem
In a Netbeans plug-in which I am developing, I have created a
MemoryFileSystem for storage of transient files.
I now wish to add a feature to append data to an existing file (in the
MemoryFileSystem), but I can't find a solution.
If the file was in the OS file system, then I could use the
FileUtils.toFile() method to get a and then use new
FileWriter (, true) to create a writer with which I could append
the data.
As the file is in a MemoryFileSystem, use of FileUtils.toFile returns
null, so it's not a route to follow.
Use of .getOutputStream() returns a valid outputstream,
but is positioned at the start of the file and will therefore
overwrite the existing data.
Any suggestions welcome, as I want to avoid copying the existing file
content to a new file on every append request and then renaming the
file (which is my probably short term fall back).
In the longer-term, it would be nice to have
.getOutputStream(boolean append) as a extension to the
API, but that can come later.
regards
Richard
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--
William Reynolds, Ph.D.
Stellar Science, LLC
wnreyno...@stellarscience.com
www.stellarscience.com
877-763-8268 x710 (v)
smime.p7s
Description: S/MIME Cryptographic Signature
Re: Appending data to file in a MemoryFileSystem.
On Thu, 19 Sep 2019 at 15:04, Richard Linsdale wrote: > Any suggestions welcome, as I want to avoid copying the existing file > content to a new file on every append request and then renaming the file > (which is my probably short term fall back). The MemoryFileSystem is quite simple, and everything is backed by a byte[]. What about reading the existing contents with asBytes() and then writing that into the output stream? Not much different mind you! > In the longer-term, it would be nice to have > .getOutputStream(boolean append) as a extension to the API, > but that can come later. Does it have to be a NetBeans filesystem? I've seen some NIO2 memory file systems which have this feature (although are probably doing just the same thing under the hood). Best wishes, Neil - To unsubscribe, e-mail: users-unsubscr...@netbeans.apache.org For additional commands, e-mail: users-h...@netbeans.apache.org For further information about the NetBeans mailing lists, visit: https://cwiki.apache.org/confluence/display/NETBEANS/Mailing+lists
Appending data to file in a MemoryFileSystem.
Hopefully somebody can help direct me to a solution to this problem In a Netbeans plug-in which I am developing, I have created a MemoryFileSystem for storage of transient files. I now wish to add a feature to append data to an existing file (in the MemoryFileSystem), but I can't find a solution. If the file was in the OS file system, then I could use the FileUtils.toFile() method to get a and then use new FileWriter (, true) to create a writer with which I could append the data. As the file is in a MemoryFileSystem, use of FileUtils.toFile returns null, so it's not a route to follow. Use of .getOutputStream() returns a valid outputstream, but is positioned at the start of the file and will therefore overwrite the existing data. Any suggestions welcome, as I want to avoid copying the existing file content to a new file on every append request and then renaming the file (which is my probably short term fall back). In the longer-term, it would be nice to have .getOutputStream(boolean append) as a extension to the API, but that can come later. regards Richard - To unsubscribe, e-mail: users-unsubscr...@netbeans.apache.org For additional commands, e-mail: users-h...@netbeans.apache.org For further information about the NetBeans mailing lists, visit: https://cwiki.apache.org/confluence/display/NETBEANS/Mailing+lists
