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/* base-contact-source.vala
*
* Copyright (C) 2008 Johann Prieur <johann.prieur@gmail.com>
* Copyright (C) 2008 Ali Sabil <ali.sabil@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
using Core.Container;
using Core.Async;
namespace People.Backend {
/**
* BaseContactSource is an abstract class implementing the
* {@link ContactSource} interface.
* <p>
* The user of this class MUST implement {@link BaseContactSource.validate_contact_id}
* and {@link BaseContactSource.create_contact_object}.
*/
public abstract class BaseContactSource : Object, ContactSource {
private ContactManager contact_manager = new ContactManager ();
private ResultManager result_manager = new ResultManager ();
private Map<AsyncResult<bool>, string> validation_map = new HashMap<AsyncResult<bool>, string> ();
/* ContactSource interface */
public ContactSourceFlags flags {
get;
protected set;
default = ContactSourceFlags.NONE;
}
public AsyncResult<Contact> request_contact (string? id) {
if (id == null && !(ContactSourceFlags.CAN_CREATE_CONTACT in flags)) {
var error = new Error.NOT_SUPPORTED ("Contact creation not supported by this backend");
return new ImmediateResult<Contact>.with_error (error);
}
if (id == null) {
return new ImmediateResult<Contact> (get_contact_object (null));
} else {
var validation = validate_contact_id (id);
validation_map.set (validation, id);
var result = new ResultChain<Contact> (validation);
result.add_transform ((async_result) => {
try {
bool valid_id = (bool) async_result.get ();
string contact_id = validation_map.get (async_result);
validation_map.remove (async_result);
if (valid_id)
return new ImmediateResult<Contact> (get_contact_object (contact_id));
else
return new ImmediateResult<Contact>.with_error (new Error.INVALID_ARGUMENT ("Requested a contact with an unknown ID: " + contact_id));
} catch (Error e) {
return new ImmediateResult<Contact>.with_error (e);
}
});
result_manager.add (result);
return result;
}
}
/* end of ContactSource interface */
protected Contact get_contact_object (string? id) {
Contact contact = null;
if (id != null) {
contact = contact_manager.request_contact (id);
}
if (contact == null) {
contact = create_contact_object (id);
register_contact (contact);
}
return contact;
}
protected void register_contact (Contact contact) {
if (contact_manager.register_contact (contact)) {
contact.notify["id"] += contact_state_changed;
}
}
/**
* The user of this class MUST implement this method to allow the validation
* and checking for the existence of the contact ID.
*/
protected abstract AsyncResult<bool> validate_contact_id (string id);
/**
* The user of this class MUST implement this method returning a Contact object
* corresponding to the contact ID. The implementation MUST NOT check for the validity
* of the given ID.
*/
protected abstract Contact create_contact_object (string? id);
private void contact_state_changed (Contact contact, ParamSpec pspec) {
if (contact.id == null)
contact_removed (contact);
else
contact_added (contact);
}
}
}
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