protected GridFSDirectoryResource newChildDir(GridFSResourcePath path, GridFSDBObject item) {
return new GridFSDirectoryResource(
requestContext(),
getChildParent(),
item.getId().toString(),
path.append(item.getString("filename")),
item);
}
@Override
public Resource member(RequestContext ctx, String id) {
GridFSResourcePath childPath = path().append(id);
if (childPath.equals(ctx.resourcePath())) {
// there are no more intermediary segments - this is the last parent,
// here we lookup / generate the target GridFS file
LinkedList<ResourcePath.Segment> segments = new LinkedList(ctx.resourcePath().segments());
// skip app
segments.removeFirst();
// skip gridfsroot
segments.removeFirst();
// init meta
boolean meta = segments.getLast().matrixParameters().containsKey("meta");
DBCollection col = getUserspace().getFilesCollection();
DBObject result = null;
GridFSDBObject last = null;
int count = 0;
for (ResourcePath.Segment segment : segments) {
count++;
// first segment represents root - root file has empty string for a name, and null parent
String name = count == 1 ? "" : segment.name();
ObjectId parentId = count == 1 ? null : last.getId();
result = col.findOne(new BasicDBObject("filename", name).append("parent", parentId));
if (result == null) {
if (ctx.requestType() == RequestType.UPDATE) {
// create fileInfo for current segment
BasicDBObject fileInfo =
new BasicDBObject("filename", name)
.append("owner", ctx.securityContext().getSubject());
if (last != null) {
fileInfo.append("parent", last.getId());
}
// insert for directories but not for files
// files get inserted via GridFS API in GridFSBlobResource
if (count < segments.size()) {
fileInfo.append("dir", true);
// autocreate missing parent directories when putting a blob
col.insert(fileInfo);
}
result = fileInfo;
} else {
return null;
}
}
last = new GridFSDBObject(result);
}
// finally we got to the fileInfo representing the target resource
if (last.isTrue("dir")) {
// if target resource represents a directory
return newChildDir(path(), last);
} else {
// if file
if (meta) {
// if last segment has matrix parameter 'meta' return meta info instead of blob content
return newChildItem(last);
} else {
// if no ;meta, then return a blob
return new GridFSBlobResource(ctx, this, id, last, childPath);
}
}
} else if (childPath.segments().size() == ctx.resourcePath().segments().size()) {
return null;
} else {
// pass-through segment
return new GridFSDirectoryResource(ctx, this, id, childPath);
}
}
