| /* |
| * Copyright (C) 2013 Google Inc. |
| * Licensed to The Android Open Source Project. |
| * |
| * 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.android.mail.browse; |
| |
| import android.content.AsyncTaskLoader; |
| import android.content.ContentResolver; |
| import android.content.Context; |
| import android.content.Intent; |
| import android.net.Uri; |
| |
| import com.android.emailcommon.TempDirectory; |
| import com.android.emailcommon.internet.MimeMessage; |
| import com.android.emailcommon.mail.MessagingException; |
| import com.android.mail.utils.LogTag; |
| import com.android.mail.utils.LogUtils; |
| |
| import java.io.File; |
| import java.io.FileNotFoundException; |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| /** |
| * Loader that builds a ConversationMessage from an EML file Uri. |
| */ |
| public class EmlMessageLoader extends AsyncTaskLoader<ConversationMessage> { |
| private static final String LOG_TAG = LogTag.getLogTag(); |
| |
| private Uri mEmlFileUri; |
| private ConversationMessage mMessage; |
| |
| public EmlMessageLoader(Context context, Uri emlFileUri) { |
| super(context); |
| mEmlFileUri = emlFileUri; |
| } |
| |
| @Override |
| public ConversationMessage loadInBackground() { |
| final Context context = getContext(); |
| TempDirectory.setTempDirectory(context); |
| final ContentResolver resolver = context.getContentResolver(); |
| final InputStream stream; |
| try { |
| stream = resolver.openInputStream(mEmlFileUri); |
| } catch (FileNotFoundException e) { |
| LogUtils.e(LOG_TAG, e, "Could not find eml file at uri: %s", mEmlFileUri); |
| return null; |
| } |
| |
| final MimeMessage mimeMessage; |
| final ConversationMessage convMessage; |
| try { |
| mimeMessage = new MimeMessage(stream); |
| convMessage = new ConversationMessage(context, mimeMessage, mEmlFileUri); |
| } catch (IOException e) { |
| LogUtils.e(LOG_TAG, e, "Could not read eml file"); |
| return null; |
| } catch (MessagingException e) { |
| LogUtils.e(LOG_TAG, e, "Error in parsing eml file"); |
| return null; |
| } finally { |
| try { |
| stream.close(); |
| } catch (IOException e) { |
| return null; |
| } |
| |
| // delete temp files created during parsing |
| final File[] cacheFiles = TempDirectory.getTempDirectory().listFiles(); |
| for (final File file : cacheFiles) { |
| if (file.getName().startsWith("body")) { |
| file.delete(); |
| } |
| } |
| |
| } |
| |
| return convMessage; |
| } |
| |
| /** |
| * Called when there is new data to deliver to the client. The |
| * super class will take care of delivering it; the implementation |
| * here just adds a little more logic. |
| */ |
| @Override |
| public void deliverResult(ConversationMessage result) { |
| if (isReset()) { |
| // An async query came in while the loader is stopped. We |
| // don't need the result. |
| if (result != null) { |
| onReleaseResources(result); |
| } |
| return; |
| } |
| ConversationMessage oldMessage = mMessage; |
| mMessage = result; |
| |
| if (isStarted()) { |
| // If the Loader is currently started, we can immediately |
| // deliver its results. |
| super.deliverResult(result); |
| } |
| |
| // At this point we can release the resources associated with |
| // 'oldMessage' if needed; now that the new result is delivered we |
| // know that it is no longer in use. |
| if (oldMessage != null && oldMessage != mMessage) { |
| onReleaseResources(oldMessage); |
| } |
| } |
| |
| /** |
| * Handles a request to start the Loader. |
| */ |
| @Override |
| protected void onStartLoading() { |
| if (mMessage != null) { |
| // If we currently have a result available, deliver it immediately. |
| deliverResult(mMessage); |
| } |
| |
| if (takeContentChanged() || mMessage == null) { |
| // If the data has changed since the last time it was loaded |
| // or is not currently available, start a load. |
| forceLoad(); |
| } |
| } |
| |
| /** |
| * Handles a request to stop the Loader. |
| */ |
| @Override protected void onStopLoading() { |
| // Attempt to cancel the current load task if possible. |
| cancelLoad(); |
| } |
| |
| /** |
| * Handles a request to cancel a load. |
| */ |
| @Override |
| public void onCanceled(ConversationMessage result) { |
| super.onCanceled(result); |
| |
| // At this point we can release the resources associated with |
| // the message, if needed. |
| if (result != null) { |
| onReleaseResources(result); |
| } |
| } |
| |
| /** |
| * Handles a request to completely reset the Loader. |
| */ |
| @Override |
| protected void onReset() { |
| super.onReset(); |
| |
| // Ensure the loader is stopped |
| onStopLoading(); |
| |
| // At this point we can release the resources associated with |
| // the message, if needed. |
| if (mMessage != null) { |
| onReleaseResources(mMessage); |
| mMessage = null; |
| } |
| } |
| |
| |
| /** |
| * Helper function to take care of releasing resources associated |
| * with an actively loaded data set. |
| */ |
| protected void onReleaseResources(ConversationMessage message) { |
| // if this eml message had attachments, start a service to clean up the cache files |
| if (message.attachmentListUri != null) { |
| final Intent intent = new Intent(Intent.ACTION_DELETE); |
| intent.setClass(getContext(), EmlTempFileDeletionService.class); |
| intent.setData(message.attachmentListUri); |
| |
| getContext().startService(intent); |
| } |
| } |
| } |