Class MIMEPartStreamingDataHandler
- All Implemented Interfaces:
Transferable
,Closeable
,AutoCloseable
StreamingDataHandler
to access MIME
attachments efficiently. Applications can use the additional methods and decide
on how to access the attachment data in JAX-WS applications.
for e.g.: DataHandler dh = proxy.getData(); StreamingDataHandler sdh = (StreamingDataHandler)dh; // readOnce() doesn't store attachment on the disk in some cases // for e.g when only one huge attachment after soap envelope part in MIME message InputStream in = sdh.readOnce(); ... in.close(); sdh.close();
- Author:
- Jitendra Kotamraju
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Constructor Summary
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Method Summary
Methods inherited from class org.jvnet.staxex.StreamingDataHandler
getHrefCid, setHrefCid
Methods inherited from class javax.activation.DataHandler
getAllCommands, getBean, getCommand, getContent, getContentType, getDataSource, getInputStream, getName, getOutputStream, getPreferredCommands, getTransferData, getTransferDataFlavors, isDataFlavorSupported, setCommandMap, setDataContentHandlerFactory, writeTo
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Constructor Details
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MIMEPartStreamingDataHandler
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Method Details
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readOnce
Description copied from class:StreamingDataHandler
Works likeDataHandler.getInputStream()
except that this method can be invoked only once.This is used as a signal from the caller that there will be no further
DataHandler.getInputStream()
invocation norStreamingDataHandler.readOnce()
invocation on this object (which would result inIOException
.)When
DataHandler
is backed by a streaming BLOB (such as an attachment in a web service read from the network), this allows the callee to avoid unnecessary buffering.Note that it is legal to call
DataHandler.getInputStream()
multiple times and then callStreamingDataHandler.readOnce()
afterward. Streams created such a way can be read in any order — there's no requirement that streams created earlier must be read first.- Specified by:
readOnce
in classStreamingDataHandler
- Returns:
- always non-null. Represents the content of this BLOB.
The returned stream is generally not buffered, so for
better performance read in a big batch or wrap this into
BufferedInputStream
. - Throws:
IOException
- if any i/o error
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moveTo
Description copied from class:StreamingDataHandler
Obtains the BLOB into a specified file.Semantically, this method is roughly equivalent to the following code, except that the actual implementation is likely to be a lot faster.
InputStream i = getInputStream(); OutputStream o = new FileOutputStream(dst); int ch; while((ch=i.read())!=-1) o.write(ch); i.close(); o.close();
The main motivation behind this method is that often
DataHandler
that reads data from a streaming source will use a temporary file as a data store to hold data (think of commons-fileupload.) In such case this method can be as fast as callingFile.renameTo(File)
.This method shouldn't be called when there are any open streams.
After this method is invoked,
StreamingDataHandler.readOnce()
andDataHandler.getInputStream()
will simply open the destination file you've specified as an argument. So if you further move the file or delete this file, those methods will behave in undefined fashion. For a simliar reason, calling this method multiple times will cause undefined behavior.- Specified by:
moveTo
in classStreamingDataHandler
- Throws:
IOException
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close
Description copied from class:StreamingDataHandler
Releases any resources associated with this DataHandler. (such as an attachment in a web service read from a temp file will be deleted.) After calling this method, it is illegal to call any other methods.- Specified by:
close
in interfaceAutoCloseable
- Specified by:
close
in interfaceCloseable
- Specified by:
close
in classStreamingDataHandler
- Throws:
IOException
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