Browse a Repository
The identifiers
fetch action provides information that can be used to browse a repository. It retrieves a list of documents that are present in the repository and generates an identifier for each document.
Action | Description | Method to override |
---|---|---|
/action=fetch&fetchaction=Identifiers
|
Retrieve a list of documents that are present in the repository. | identifiers
|
Declare the Types of Identifiers
Before implementing the action, you must specify the types of identifier that the connector can return. For example, a connector that retrieves information from a file system might return identifiers that represent folders and identifiers that represent files.
Declare each IdentifierType
as public static readonly
in the main connector class:
public class FileSystemConnector : ConnectorBase { public static readonly IdentifierType IdFolder = new IdentifierType("Folder", IdAttr.Container); public static readonly IdentifierType IdFile = new IdentifierType("File", IdAttr.Document); ... }
These fields are automatically found by the default implementation of the GetIdentifierTypes()
function on the ConnectorBase
class:
virtual public IIdentifierTypes GetIdentifierTypes();
The default implementation means there is no need for you to implement this function.
You can verify the identifier types you have declared by running /action=GetStatus
, which returns the list of IdentifierTypes
and attributes.
Implement the Identifiers Action
To implement the identifiers
action, override the identifiers
method.
When you implement the action, you can choose whether your users must set the parameter ParentIdentifiers
in the identifiers
action request.
The parameter ParentIdentifiers
accepts a comma-separated list of identifiers. The action should return identifiers for items that exist below the parent identifiers in the repository. For example, the user might specify an identifier for a folder and would expect the action to return identifiers for folders and files contained within that folder. Alternatively, the user might specify the root of the repository by including the special identifier ROOT
. The following sample code demonstrates how to implement the identifiers
action and handle these cases.
public override void Identifiers( IIdentifiersTask task ) { // Loop over all parent Identifiers provided in action request foreach ( IParentIdentifier parentIdentifier in task.Parents ) { try { // The special Identifier "ROOT" is used to request the top level // Identifiers in the repository. if (parentIdentifier.IsRoot) { // Add children of repository root. // The parameters are: the parent identifier, an Identifier for the child item, // and a display name for the child item. // The task.MakeId() function returns an IdentifierBuilder that can be // used to build up the Identifier. task.AddIdentifier(parentIdentifier, task.MakeId().Reference(@"\Child").Type(IdFolder).Get(), @"\Child"); } else { // Add children of provided identifier. // Use the information from the parentIdentifier to find the parent item, // iterate over children and call task.AddIdentifier for each child, for example: string childReference = parentIdentifier.IdentifierData.Identifier.Reference + @"\somefile.txt"; task.AddIdentifier(parentIdentifier, task.MakeId().Reference(childReference).Type(IdFile).Get(), childReference); } } catch ( Exception e ) { // If an error occurs while retrieving the children, this error can be // reported as associated with the parent Identifier. // You can report general errors throughout the task by omitting // the parentIdentifier parameter. task.AddError( parentIdentifier, e.Message ); } } }