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 String title;
  41         protected String description;
  42         protected String albumImage;
  43
  44         protected AbstractAlbum(String id) {
  45                 this.id = checkNotNull(id, "id must not be null");
  46         }
  47
  48         @Override
  49         public String getId() {
  50                 return id;
  51         }
  52
  53         @Override
  54         public boolean isEmpty() {
  55                 return getAlbums().isEmpty() && getImages().isEmpty();
  56         }
  57
  58         @Override
  59         public boolean isRoot() {
  60                 return getParent() == null;
  61         }
  62
  63         @Override
  64         public String getTitle() {
  65                 return title;
  66         }
  67
  68         @Override
  69         public String getDescription() {
  70                 return description;
  71         }
  72
  73         @Override
  74         public Modifier modify() throws IllegalStateException {
  75                 // TODO: reenable check for local Sones
  76                 return new Modifier() {
  77                         private Optional<String> title = absent();
  78                         private Optional<String> description = absent();
  79                         private Optional<String> albumImage = absent();
  80
  81                         @Override
  82                         public Modifier setTitle(String title) {
  83                                 this.title = fromNullable(title);
  84                                 return this;
  85                         }
  86
  87                         @Override
  88                         public Modifier setDescription(String description) {
  89                                 this.description = fromNullable(description);
  90                                 return this;
  91                         }
  92
  93                         @Override
  94                         public Modifier setAlbumImage(String imageId) {
  95                                 this.albumImage = fromNullable(imageId);
  96                                 return this;
  97                         }
  98
  99                         @Override
 100                         public Album update() throws IllegalStateException {
 101                                 if (title.isPresent()) {
 102                                         AbstractAlbum.this.title = title.get();
 103                                 }
 104                                 if (description.isPresent()) {
 105                                         AbstractAlbum.this.description = description.get();
 106                                 }
 107                                 if (albumImage.isPresent()) {
 108                                         AbstractAlbum.this.albumImage = albumImage.get();
 109                                 }
 110                                 return AbstractAlbum.this;
 111                         }
 112                 };
 113         }
 114
 115         @Override
 116         public String getFingerprint() {
 117                 Hasher hash = Hashing.sha256().newHasher();
 118                 hash.putString("Album(");
 119                 hash.putString("ID(").putString(id).putString(")");
 120                 hash.putString("Title(").putString(title).putString(")");
 121                 hash.putString("Description(").putString(description).putString(")");
 122                 if (albumImage != null) {
 123                         hash.putString("AlbumImage(").putString(albumImage).putString(")");
 124                 }
 125
 126                 /* add nested albums. */
 127                 hash.putString("Albums(");
 128                 for (Album album : getAlbums()) {
 129                         hash.putString(album.getFingerprint());
 130                 }
 131                 hash.putString(")");
 132
 133                 /* add images. */
 134                 hash.putString("Images(");
 135                 for (Image image : getImages()) {
 136                         if (image.isInserted()) {
 137                                 hash.putString(image.getFingerprint());
 138                         }
 139                 }
 140                 hash.putString(")");
 141
 142                 hash.putString(")");
 143                 return hash.hash().toString();
 144         }
 145
 146         @Override
 147         public int hashCode() {
 148                 return id.hashCode();
 149         }
 150
 151         @Override
 152         public boolean equals(Object object) {
 153                 if (!(object instanceof DefaultAlbum)) {
 154                         return false;
 155                 }
 156                 DefaultAlbum album = (DefaultAlbum) object;
 157                 return id.equals(album.id);
 158         }
 159 }