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      1 /*
      2  * Copyright (C) 2013 Google Inc.
      3  * Licensed to The Android Open Source Project.
      4  *
      5  * Licensed under the Apache License, Version 2.0 (the "License");
      6  * you may not use this file except in compliance with the License.
      7  * You may obtain a copy of the License at
      8  *
      9  *      http://www.apache.org/licenses/LICENSE-2.0
     10  *
     11  * Unless required by applicable law or agreed to in writing, software
     12  * distributed under the License is distributed on an "AS IS" BASIS,
     13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     14  * See the License for the specific language governing permissions and
     15  * limitations under the License.
     16  */
     17 
     18 package com.android.mail.browse;
     19 
     20 import android.content.Context;
     21 import android.database.Cursor;
     22 import android.net.Uri;
     23 
     24 import com.android.emailcommon.internet.MimeMessage;
     25 import com.android.emailcommon.mail.MessagingException;
     26 import com.android.mail.browse.MessageCursor.ConversationController;
     27 import com.android.mail.content.CursorCreator;
     28 import com.android.mail.providers.Account;
     29 import com.android.mail.providers.Attachment;
     30 import com.android.mail.providers.Conversation;
     31 import com.android.mail.providers.Message;
     32 import com.android.mail.ui.ConversationUpdater;
     33 import com.google.common.base.Objects;
     34 
     35 /**
     36  * A message created as part of a conversation view. Sometimes, like during star/unstar, it's
     37  * handy to have the owning {@link com.android.mail.providers.Conversation} for context.
     38  *
     39  * <p>This class must remain separate from the {@link MessageCursor} from whence it came,
     40  * because cursors can be closed by their Loaders at any time. The
     41  * {@link ConversationController} intermediate is used to obtain the currently opened cursor.
     42  *
     43  * <p>(N.B. This is a {@link android.os.Parcelable}, so try not to add non-transient fields here.
     44  * Parcelable state belongs either in {@link com.android.mail.providers.Message} or
     45  * {@link com.android.mail.ui.ConversationViewState.MessageViewState}. The
     46  * assumption is that this class never needs the state of its extra context saved.)
     47  */
     48 public final class ConversationMessage extends Message {
     49 
     50     private transient ConversationController mController;
     51 
     52     private ConversationMessage(Cursor cursor) {
     53         super(cursor);
     54     }
     55 
     56     public ConversationMessage(Context context, MimeMessage mimeMessage, Uri emlFileUri)
     57             throws MessagingException {
     58         super(context, mimeMessage, emlFileUri);
     59     }
     60 
     61     public void setController(ConversationController controller) {
     62         mController = controller;
     63     }
     64 
     65     public Conversation getConversation() {
     66         return mController != null ? mController.getConversation() : null;
     67     }
     68 
     69     public Account getAccount() {
     70         return mController != null ? mController.getAccount() : null;
     71     }
     72 
     73     /**
     74      * Returns a hash code based on this message's identity, contents and current state.
     75      * This is a separate method from hashCode() to allow for an instance of this class to be
     76      * a functional key in a hash-based data structure.
     77      *
     78      */
     79     public int getStateHashCode() {
     80         return Objects.hashCode(uri, read, starred, getAttachmentsStateHashCode());
     81     }
     82 
     83     private int getAttachmentsStateHashCode() {
     84         int hash = 0;
     85         for (Attachment a : getAttachments()) {
     86             final Uri uri = a.getIdentifierUri();
     87             hash += (uri != null ? uri.hashCode() : 0);
     88         }
     89         return hash;
     90     }
     91 
     92     public boolean isConversationStarred() {
     93         final MessageCursor c = mController.getMessageCursor();
     94         return c != null && c.isConversationStarred();
     95     }
     96 
     97     public void star(boolean newStarred) {
     98         final ConversationUpdater listController = mController.getListController();
     99         if (listController != null) {
    100             listController.starMessage(this, newStarred);
    101         }
    102     }
    103 
    104     /**
    105      * Public object that knows how to construct Messages given Cursors.
    106      */
    107     public static final CursorCreator<ConversationMessage> FACTORY =
    108             new CursorCreator<ConversationMessage>() {
    109                 @Override
    110                 public ConversationMessage createFromCursor(Cursor c) {
    111                     return new ConversationMessage(c);
    112                 }
    113 
    114                 @Override
    115                 public String toString() {
    116                     return "ConversationMessage CursorCreator";
    117                 }
    118             };
    119 
    120 }
    121