/*
* Copyright 2012 GitHub Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.github.mobile.accounts;
import android.accounts.Account;
import android.accounts.AccountManager;
import android.app.Activity;
import android.content.Context;
import com.google.inject.Inject;
import java.io.IOException;
import java.util.concurrent.Executor;
import roboguice.inject.ContextScope;
import roboguice.util.RoboAsyncTask;
/**
* Base task class that ensures an authenticated account exists before
* {@link #run(Account)} is invoked
*
* @param <ResultT>
*/
public abstract class AuthenticatedUserTask<ResultT> extends
RoboAsyncTask<ResultT> {
@Inject
private ContextScope contextScope;
@Inject
private AccountScope accountScope;
@Inject
private Activity activity;
/**
* Create asynchronous task that ensures a valid account is present when
* executed
*
* @param context
*/
protected AuthenticatedUserTask(final Context context) {
super(context);
}
/**
* Create asynchronous task that ensures a valid account is present when
* executed
*
* @param context
* @param executor
*/
public AuthenticatedUserTask(final Context context, final Executor executor) {
super(context, executor);
}
@Override
public final ResultT call() throws Exception {
final AccountManager manager = AccountManager.get(activity);
final Account account = AccountUtils.getAccount(manager, activity);
accountScope.enterWith(account, manager);
try {
contextScope.enter(getContext());
try {
return run(account);
} catch (IOException e) {
// Retry task if authentication failure occurs and account is
// successfully updated
if (AccountUtils.isUnauthorized(e)
&& AccountUtils.updateAccount(account, activity))
return run(account);
else
throw e;
} finally {
contextScope.exit(getContext());
}
} finally {
accountScope.exit();
}
}
/**
* Execute task with an authenticated account
*
* @param account
* @return result
* @throws Exception
*/
protected abstract ResultT run(Account account) throws Exception;
}