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/*
* Copyright (C) 2012 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.ui;
import android.app.Activity;
import android.content.AsyncTaskLoader;
import android.net.Uri;
import com.android.mail.browse.ConversationCursor;
import com.android.mail.providers.Account;
import com.android.mail.providers.UIProvider.AccountCapabilities;
import com.android.mail.utils.LogUtils;
import java.util.ArrayList;
public class ConversationCursorLoader extends AsyncTaskLoader<ConversationCursor> {
private static final String TAG = "ConversationCursorLoader";
private final Uri mUri;
private final ConversationCursor mConversationCursor;
private boolean mInit = false;
private boolean mClosed = false;
private boolean mRetain = false;
private boolean mRetained = false;
private final String mName;
/** Only used for debugging. Turn {@link #DEBUG} on to make this useful. */
private static final boolean DEBUG = false;
private static final ArrayList<ConversationCursorLoader> sLoaders =
new ArrayList<ConversationCursorLoader>();
public ConversationCursorLoader(Activity activity, Account account,
Uri uri, String name, boolean ignoreInitialConversationLimit) {
super(activity);
mUri = uri;
mName = name;
final boolean useInitialConversationLimit = ignoreInitialConversationLimit ? false :
account.supportsCapability(AccountCapabilities.INITIAL_CONVERSATION_LIMIT);
// Initialize the state of the conversation cursor
mConversationCursor = new ConversationCursor(
activity, mUri, useInitialConversationLimit, name);
addLoader();
}
private static void dumpLoaders() {
if (DEBUG) {
LogUtils.d(TAG, "Loaders: ");
for (ConversationCursorLoader loader: sLoaders) {
LogUtils.d(TAG, " >> " + loader.mName + " (" + loader.mUri + ")");
}
}
}
private void addLoader() {
if (DEBUG) {
LogUtils.d(TAG, "Add loader: " + mUri);
sLoaders.add(this);
if (sLoaders.size() > 1) {
dumpLoaders();
}
}
}
/**
* Indicate whether the loader's cursor should be retained after reset
* @param state whether this laoder's cursor should be retained
*/
public void retainCursor(boolean state) {
mRetain = state;
}
@Override
public void onReset() {
if (!mRetain) {
// Mark the cursor as disabled
mConversationCursor.disable();
mClosed = true;
if (DEBUG) {
LogUtils.d(TAG, "Reset loader/disable cursor: " + mName);
sLoaders.remove(this);
if (!sLoaders.isEmpty()) {
dumpLoaders();
}
}
} else {
if (DEBUG) {
LogUtils.d(TAG, "Reset loader/retain cursor: " + mName);
mRetained = true;
}
}
}
@Override
public ConversationCursor loadInBackground() {
if (!mInit) {
mConversationCursor.load();
mInit = true;
}
return mConversationCursor;
}
@Override
protected void onStartLoading() {
if (mClosed) {
mClosed = false;
mConversationCursor.load();
addLoader();
if (DEBUG) {
LogUtils.d(TAG, "Restarting reset loader: " + mName);
}
} else if (mRetained) {
mRetained = false;
if (DEBUG) {
LogUtils.d(TAG, "Resuming retained loader: " + mName);
}
}
forceLoad();
mConversationCursor.resume();
}
@Override
protected void onStopLoading() {
cancelLoad();
mConversationCursor.pause();
}
}
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