/**
* Creates an output stream to where the artifact content can be written to.
*
* <p>If the artifact already exists and the artifact is not a link a <code>
* ArtifactAlreadyExistsException</code> will be thrown. If the directory doesn't exists, it will
* be created.
*
* @exception IOException if an IO error occurs.
* @exception NullArgumentException if the artifact argument is null.
* @exception ArtifactAlreadyExistsException if the artifact already exists in the cache and the
* artifact is not a link.
*/
public OutputStream createOutputStream(Artifact artifact)
throws NullArgumentException, ArtifactAlreadyExistsException, IOException {
if (null == artifact) {
throw new NullArgumentException("artifact");
}
ResourceHost any = findAnyPresence(artifact);
String scheme = artifact.getScheme();
boolean flag = !"link".equals(scheme);
if ((any != null) && flag) {
throw new ArtifactAlreadyExistsException("Artifact found on server.", artifact);
}
String path = m_resolver.resolvePath(artifact);
File destination = new File(m_cacheDir, path);
if (destination.exists() && flag) {
throw new ArtifactAlreadyExistsException("Artifact found in cache.", artifact);
}
File parentDir = destination.getParentFile();
if (!parentDir.exists()) {
parentDir.mkdirs();
}
return new FileOutputStream(destination);
}
