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

   1 /*
   2  * Sone - AbstractImage.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 import static com.google.common.base.Preconditions.checkState;
  24
  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 Image} 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 AbstractImage implements Image {
  38
  39         protected final String id;
  40         protected final long creationTime;
  41         protected final int width;
  42         protected final int height;
  43         protected String key;
  44         protected String title;
  45         protected String description;
  46
  47         public AbstractImage(String id, String key, long creationTime, int width, int height) {
  48                 this.id = checkNotNull(id, "id must not be null");
  49                 this.key = key;
  50                 this.creationTime = creationTime;
  51                 this.width = width;
  52                 this.height = height;
  53         }
  54
  55         @Override
  56         public String getId() {
  57                 return id;
  58         }
  59
  60         @Override
  61         public String getKey() {
  62                 return key;
  63         }
  64
  65         @Override
  66         public boolean isInserted() {
  67                 return key != null;
  68         }
  69
  70         @Override
  71         public long getCreationTime() {
  72                 return creationTime;
  73         }
  74
  75         @Override
  76         public int getWidth() {
  77                 return width;
  78         }
  79
  80         @Override
  81         public int getHeight() {
  82                 return height;
  83         }
  84
  85         @Override
  86         public String getTitle() {
  87                 return title;
  88         }
  89
  90         @Override
  91         public String getDescription() {
  92                 return description;
  93         }
  94
  95         @Override
  96         public Modifier modify() throws IllegalStateException {
  97                 // TODO: reenable check for local images
  98                 return new Modifier() {
  99                         private Optional<String> key = absent();
 100                         private Optional<String> title = absent();
 101                         private Optional<String> description = absent();
 102
 103                         @Override
 104                         public Modifier setKey(String key) {
 105                                 this.key = fromNullable(key);
 106                                 return this;
 107                         }
 108
 109                         @Override
 110                         public Modifier setTitle(String title) {
 111                                 this.title = fromNullable(title);
 112                                 return this;
 113                         }
 114
 115                         @Override
 116                         public Modifier setDescription(String description) {
 117                                 this.description = fromNullable(description);
 118                                 return this;
 119                         }
 120
 121                         @Override
 122                         public Image update() throws IllegalStateException {
 123                                 checkState(!key.isPresent() || (AbstractImage.this.key == null), "key can not be changed");
 124
 125                                 if (key.isPresent()) {
 126                                         AbstractImage.this.key = key.get();
 127                                 }
 128                                 if (title.isPresent()) {
 129                                         AbstractImage.this.title = title.get();
 130                                 }
 131                                 if (description.isPresent()) {
 132                                         AbstractImage.this.description = description.get();
 133                                 }
 134
 135                                 return AbstractImage.this;
 136                         }
 137                 };
 138         }
 139
 140         @Override
 141         public String getFingerprint() {
 142                 Hasher hash = Hashing.sha256().newHasher();
 143                 hash.putString("Image(");
 144                 hash.putString("ID(").putString(id).putString(")");
 145                 hash.putString("Title(").putString(title).putString(")");
 146                 hash.putString("Description(").putString(description).putString(")");
 147                 hash.putString(")");
 148                 return hash.hash().toString();
 149         }
 150
 151         @Override
 152         public int hashCode() {
 153                 return id.hashCode();
 154         }
 155
 156         @Override
 157         public boolean equals(Object object) {
 158                 if (!(object instanceof AbstractImage)) {
 159                         return false;
 160                 }
 161                 return ((AbstractImage) object).id.equals(id);
 162         }
 163
 164 }