topic Re: Return the content of an associated node when reading another in Alfresco Archive

Return the content of an associated node when reading another

technaton — Fri, 02 May 2014 13:36:30 GMT

Hello fellow developers,I'm currently developing a Alfresco extension to mimick Linux/Unix syslinks in Alfresco. I've developed a Share action that creates nodes of the type app:filelink‍ and sets all properties correctly.However, when reading the node via CIFS (JLAN), it opens as a text file. Which

Re: Return the content of an associated node when reading another

kaynezhang — Sat, 03 May 2014 02:42:04 GMT

In alfresco 'd default implementation ,A link must extends 'cm:link' type("app:filelink" for file ,"app:folderlink" for folder). "cm:link" type has single NodeRef value property ContentModel.PROP_LINK_DESTINATION which is used to save the node that should be linked to.

When you try to open a file on SMB/CIFS the file system.
1.alfresco will first try to fetch the node at the specified path,
2.and then check whether this node has "cm:destination" property,
3.if this node has "cm:destination" property, then it is a link node ,A file Whose content is the url link of the target node will return to you
4.if this node dose not have "cm:destination" property, then it is a common node ,A temp file with a copy of the content of node will return to you.

So if you want to return the content of target node instead of url link of the target node,In my opoinon you should customize a new filesystem driver class(for example extends org.alfresco.filesys.repo.ContentDiskDriver2),and override openFile method.
In you openFile method implementation ,check node type,if it's your custom link type, return the content of link target node instead of url link .

Re: Return the content of an associated node when reading another

technaton — Thu, 15 May 2014 11:09:59 GMT

kaynezhang,

thank you for your reply.

<cite>if this node has "cm:destination" property, then it is a link node ,A file Whose content is the url link of the target node will return to you</cite>

The problem is that this does not happen. I always get an InternetLink text file in return, like this one:

[InternetShortcut]
URL=file://172.16.100.90/Alfresco/Sites/ifo/documentLibrary/Testsperren.xlsx‍‍

There seems to be some kind of dynamic handling here, because the IP address is replaced with the DNS hostname on some hosts. I guess I'll dig in the source code. Overwriting the ContentDiskDriver2's openFile meothd does not sound like anything that is easily maintainable.

Thanks again!
— Eric

Re: Return the content of an associated node when reading another

kaynezhang — Thu, 15 May 2014 16:44:44 GMT

I have traced the source code before,In my opinion to implement your requirement,you should replace or extend ContentDiskDriver2.
Maybe I'm wrong and others have any other good solutions