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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.browse;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import com.android.mail.content.ObjectCursor;
import com.android.mail.providers.Account;
import com.android.mail.providers.Attachment;
import com.android.mail.providers.Conversation;
import com.android.mail.providers.UIProvider.CursorExtraKeys;
import com.android.mail.providers.UIProvider.CursorStatus;
import com.android.mail.ui.ConversationUpdater;
import com.google.common.collect.Lists;
import java.util.List;
/**
* MessageCursor contains the messages within a conversation; the public methods within should
* only be called by the UI thread, as cursor position isn't guaranteed to be maintained
*/
public class MessageCursor extends ObjectCursor<ConversationMessage> {
/**
* The current controller that this cursor can use to reference the owning {@link Conversation},
* and a current {@link ConversationUpdater}. Since this cursor will survive a rotation, but
* the controller does not, whatever the new controller is MUST update this reference before
* using this cursor.
*/
private ConversationController mController;
private Integer mStatus;
public interface ConversationController {
Conversation getConversation();
ConversationUpdater getListController();
MessageCursor getMessageCursor();
Account getAccount();
}
public MessageCursor(Cursor inner) {
super(inner, ConversationMessage.FACTORY);
}
public void setController(ConversationController controller) {
mController = controller;
}
public ConversationMessage getMessage() {
final ConversationMessage m = getModel();
// ALWAYS set up each ConversationMessage with the latest controller.
// Rotation invalidates everything except this Cursor, its Loader and the cached Messages,
// so if we want to continue using them after rotate, we have to ensure their controller
// references always point to the current controller.
m.setController(mController);
return m;
}
public Conversation getConversation() {
return mController != null ? mController.getConversation() : null;
}
// Is the conversation starred?
public boolean isConversationStarred() {
int pos = -1;
while (moveToPosition(++pos)) {
if (getMessage().starred) {
return true;
}
}
return false;
}
public boolean isConversationRead() {
int pos = -1;
while (moveToPosition(++pos)) {
if (!getMessage().read) {
return false;
}
}
return true;
}
public void markMessagesRead() {
int pos = -1;
while (moveToPosition(++pos)) {
getMessage().read = true;
}
}
public ConversationMessage getMessageForId(long id) {
if (isClosed()) {
return null;
}
int pos = -1;
while (moveToPosition(++pos)) {
final ConversationMessage m = getMessage();
if (id == m.id) {
return m;
}
}
return null;
}
public int getStateHashCode() {
return getStateHashCode(0);
}
/**
* Calculate a hash code that compactly summarizes the state of the messages in this cursor,
* with respect to the way the messages are displayed in conversation view. This is not a
* general-purpose hash code. When the state hash codes of a new cursor differs from the
* existing cursor's hash code, the conversation view will re-render from scratch.
*
* @param exceptLast optional number of messages to exclude iterating through at the end of the
* cursor. pass zero to iterate through all messages (or use {@link #getStateHashCode()}).
* @return state hash code of the selected messages in this cursor
*/
public int getStateHashCode(int exceptLast) {
int hashCode = 17;
int pos = -1;
final int stopAt = getCount() - exceptLast;
while (moveToPosition(++pos) && pos < stopAt) {
hashCode = 31 * hashCode + getMessage().getStateHashCode();
}
return hashCode;
}
public int getStatus() {
if (mStatus != null) {
return mStatus;
}
mStatus = CursorStatus.LOADED;
final Bundle extras = getExtras();
if (extras != null && extras.containsKey(CursorExtraKeys.EXTRA_STATUS)) {
mStatus = extras.getInt(CursorExtraKeys.EXTRA_STATUS);
}
return mStatus;
}
/**
* Returns true if the cursor is fully loaded. Returns false if the cursor is expected to get
* new messages.
* @return
*/
public boolean isLoaded() {
return !CursorStatus.isWaitingForResults(getStatus());
}
public String getDebugDump() {
StringBuilder sb = new StringBuilder();
sb.append(String.format("conv='%s' status=%d messages:\n",
mController.getConversation(), getStatus()));
int pos = -1;
while (moveToPosition(++pos)) {
final ConversationMessage m = getMessage();
final List<Uri> attUris = Lists.newArrayList();
for (Attachment a : m.getAttachments()) {
attUris.add(a.uri);
}
sb.append(String.format(
"[Message #%d hash=%s uri=%s id=%s serverId=%s from='%s' draftType=%d" +
" sendingState=%s read=%s starred=%s attUris=%s]\n",
pos, m.getStateHashCode(), m.uri, m.id, m.serverId, m.getFrom(), m.draftType,
m.sendingState, m.read, m.starred, attUris));
}
return sb.toString();
}
}
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