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Obtaining a bundle as bytes [message #67383]

Mon, 15 May 2006 07:05

Eclipse User

Originally posted by: kkiran7.gmail.com

I have two entities , both of them running OSGi containers.
Each of them can query the other for bundles installed on
its intance and can request a bundle.

So I would want to send the bundle as bytes. Here is what
I am doing:
------------------------------------------------------------ ---------------------------------
long bundleId = in.readLong();
Bundle bundle = context.getBundle( bundleId);
File file = bundleContext.getDataFile( bundle.getLocation() );
bytes[] fileBytes = getBytes( file );
// Here I write the bundle to the outputstream
out.write(fileBytes, 0 , fileBytes.length);

private byte[] getBytes( File file ) throws IOException{
byte[] bytes=null;
int size,offset=0, numRead=0;

size = (int)file.length();// Integer.MAX_VALUE ~ 4.3 GB. We dont
transfer such large files
FileInputStream in =null;
bytes = new byte[size];
try{
in = new FileInputStream( file );
while( (offset < bytes.length)&&
( (numRead = in.read(bytes,offset,bytes.length-offset))>=0)){
offset+=numRead;
}
if( offset < bytes.length) throw new IOException("Could not completely
read the file "+file.getName());
return bytes;
}catch( FileNotFoundException ex){
throw new IOException("File "+file.getName()+" is not found !");
}finally{
if( in!=null ){
try{
in.close();
}catch( Exception ex){}
}
}
}

------------------------------------------------------------ ---------------------------------------

Am I doing the right thing. Please clarify.

Thanks,

Kiran Kuppa

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Re: Obtaining a bundle as bytes [message #68041 is a reply to message #67383]

Wed, 24 May 2006 18:57

Thomas Watson

Messages: 503
Registered: July 2009

Senior Member

No that is not really what BundleContext#getDataFile is used for. That
will give your bundle access to a "private" File space where you can
persist data for your bundle. Bundle#getLocation will return a
"location" string but that string can be in any format, it is not
guaranteed to be a path to the bundle on disk. In fact in Eclipse it
does not really look like a file URL at all.

You can use the FileLocator class to get what you want using bundle
entry URLs to the root of your bundle. Here is some code to do that ...

import java.io.*;
import java.net.URL;
import org.eclipse.core.runtime.FileLocator;
import org.osgi.framework.Bundle;

....

public static InputStream getBundleStream(Bundle bundle) throws
IOException {
URL root = bundle.getEntry("");
root = FileLocator.resolve(root);
if (!"jar".equals(root.getProtocol())) {
// nothing we can do if it is not a jar URL
throw new IOException(
"Bad bundle root URL: " + root.toExternalForm());
}
String bundlePath = root.getPath();
// strip out the file: and !/
bundlePath = bundlePath.substring(5, bundlePath.lastIndexOf('!'));
return new FileInputStream(new File(bundlePath));
}

....

I hope that helps.

Tom

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