src/main/java/net/pterodactylus/sone/data/impl/AbstractAlbum.java

   1 /*
   2  * Sone - AbstractAlbum.java - Copyright © 2013 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.data.impl;
  19
  20 import static com.google.common.base.Optional.absent;
  21 import static com.google.common.base.Optional.fromNullable;
  22 import static com.google.common.base.Preconditions.checkNotNull;
  23
  24 import net.pterodactylus.sone.data.Album;
  25 import net.pterodactylus.sone.data.Image;
  26
  27 import com.google.common.base.Optional;
  28 import com.google.common.hash.Hasher;
  29 import com.google.common.hash.Hashing;
  30
  31 /**
  32  * Abstract {@link Album} implementation that contains only the attributes that
  33  * are {@link String}s or primitives.
  34  *
  35  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  36  */
  37 public abstract class AbstractAlbum implements Album {
  38
  39         protected final String id;
  40         protected final String parentId;
  41         protected String title;
  42         protected String description;
  43         protected String albumImage;
  44
  45         protected AbstractAlbum(String id, String parentId) {
  46                 this.id = checkNotNull(id, "id must not be null");
  47                 this.parentId = parentId;
  48         }
  49
  50         @Override
  51         public String getId() {
  52                 return id;
  53         }
  54
  55         @Override
  56         public boolean isEmpty() {
  57                 return getAlbums().isEmpty() && getImages().isEmpty();
  58         }
  59
  60         @Override
  61         public boolean isRoot() {
  62                 return parentId == null;
  63         }
  64
  65         @Override
  66         public String getTitle() {
  67                 return title;
  68         }
  69
  70         @Override
  71         public String getDescription() {
  72                 return description;
  73         }
  74
  75         @Override
  76         public Modifier modify() throws IllegalStateException {
  77                 // TODO: reenable check for local Sones
  78                 return new Modifier() {
  79                         private Optional<String> title = absent();
  80                         private Optional<String> description = absent();
  81                         private Optional<String> albumImage = absent();
  82
  83                         @Override
  84                         public Modifier setTitle(String title) {
  85                                 this.title = fromNullable(title);
  86                                 return this;
  87                         }
  88
  89                         @Override
  90                         public Modifier setDescription(String description) {
  91                                 this.description = fromNullable(description);
  92                                 return this;
  93                         }
  94
  95                         @Override
  96                         public Modifier setAlbumImage(String imageId) {
  97                                 this.albumImage = fromNullable(imageId);
  98                                 return this;
  99                         }
 100
 101                         @Override
 102                         public Album update() throws IllegalStateException {
 103                                 if (title.isPresent()) {
 104                                         AbstractAlbum.this.title = title.get();
 105                                 }
 106                                 if (description.isPresent()) {
 107                                         AbstractAlbum.this.description = description.get();
 108                                 }
 109                                 if (albumImage.isPresent()) {
 110                                         AbstractAlbum.this.albumImage = albumImage.get();
 111                                 }
 112                                 return AbstractAlbum.this;
 113                         }
 114                 };
 115         }
 116
 117         @Override
 118         public String getFingerprint() {
 119                 Hasher hash = Hashing.sha256().newHasher();
 120                 hash.putString("Album(");
 121                 hash.putString("ID(").putString(id).putString(")");
 122                 hash.putString("Title(").putString(title).putString(")");
 123                 hash.putString("Description(").putString(description).putString(")");
 124                 if (albumImage != null) {
 125                         hash.putString("AlbumImage(").putString(albumImage).putString(")");
 126                 }
 127
 128                 /* add nested albums. */
 129                 hash.putString("Albums(");
 130                 for (Album album : getAlbums()) {
 131                         hash.putString(album.getFingerprint());
 132                 }
 133                 hash.putString(")");
 134
 135                 /* add images. */
 136                 hash.putString("Images(");
 137                 for (Image image : getImages()) {
 138                         if (image.isInserted()) {
 139                                 hash.putString(image.getFingerprint());
 140                         }
 141                 }
 142                 hash.putString(")");
 143
 144                 hash.putString(")");
 145                 return hash.hash().toString();
 146         }
 147
 148         @Override
 149         public int hashCode() {
 150                 return id.hashCode();
 151         }
 152
 153         @Override
 154         public boolean equals(Object object) {
 155                 if (!(object instanceof DefaultAlbum)) {
 156                         return false;
 157                 }
 158                 DefaultAlbum album = (DefaultAlbum) object;
 159                 return id.equals(album.id);
 160         }
 161 }