src/main/java/net/pterodactylus/sone/template/ReplyGroupFilter.java

   1 /*
   2  * Sone - ReplyGroupFilter.java - Copyright © 2010–2016 David Roden
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 package net.pterodactylus.sone.template;
  19
  20 import java.util.HashMap;
  21 import java.util.HashSet;
  22 import java.util.List;
  23 import java.util.Map;
  24 import java.util.Map.Entry;
  25 import java.util.Set;
  26
  27 import net.pterodactylus.sone.data.Post;
  28 import net.pterodactylus.sone.data.PostReply;
  29 import net.pterodactylus.sone.data.Sone;
  30 import net.pterodactylus.util.template.Filter;
  31 import net.pterodactylus.util.template.TemplateContext;
  32
  33 import com.google.common.base.Optional;
  34
  35 /**
  36  * {@link Filter} implementation that groups replies by the post the are in
  37  * reply to, returning a map with the post as key and the list of replies as
  38  * values.
  39  *
  40  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  41  */
  42 public class ReplyGroupFilter implements Filter {
  43
  44         /**
  45          * {@inheritDoc}
  46          */
  47         @Override
  48         public Object format(TemplateContext templateContext, Object data, Map<String, Object> parameters) {
  49                 @SuppressWarnings("unchecked")
  50                 List<PostReply> allReplies = (List<PostReply>) data;
  51                 Map<Post, Set<Sone>> postSones = new HashMap<Post, Set<Sone>>();
  52                 Map<Post, Set<PostReply>> postReplies = new HashMap<Post, Set<PostReply>>();
  53                 for (PostReply reply : allReplies) {
  54                         /*
  55                          * All replies from a new-reply notification have posts,
  56                          * ListNotificationFilters takes care of that.
  57                          */
  58                         Optional<Post> post = reply.getPost();
  59                         Set<Sone> sones = postSones.get(post.get());
  60                         if (sones == null) {
  61                                 sones = new HashSet<Sone>();
  62                                 postSones.put(post.get(), sones);
  63                         }
  64                         sones.add(reply.getSone());
  65                         Set<PostReply> replies = postReplies.get(post.get());
  66                         if (replies == null) {
  67                                 replies = new HashSet<PostReply>();
  68                                 postReplies.put(post.get(), replies);
  69                         }
  70                         replies.add(reply);
  71                 }
  72                 Map<Post, Map<String, Set<?>>> result = new HashMap<Post, Map<String, Set<?>>>();
  73                 for (Entry<Post, Set<Sone>> postEntry : postSones.entrySet()) {
  74                         if (result.containsKey(postEntry.getKey())) {
  75                                 continue;
  76                         }
  77                         Map<String, Set<?>> postResult = new HashMap<String, Set<?>>();
  78                         postResult.put("sones", postEntry.getValue());
  79                         postResult.put("replies", postReplies.get(postEntry.getKey()));
  80                         result.put(postEntry.getKey(), postResult);
  81                 }
  82                 return result;
  83         }
  84
  85 }