Add basic metadata.

diff --git a/src/main/java/net/pterodactylus/sonitus/data/Metadata.java b/src/main/java/net/pterodactylus/sonitus/data/Metadata.java
new file mode 100644 (file)
index 0000000..22fbb27
--- /dev/null
+++ b/src/main/java/net/pterodactylus/sonitus/data/Metadata.java
@@ -0,0 +1,100 @@
+/*
+ * Sonitus - Metainfo.java - Copyright © 2013 David Roden
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package net.pterodactylus.sonitus.data;
+
+import com.google.common.base.Optional;
+
+/**
+ * Metadata contains information about a source, e.g. the name of the content,
+ * the artist performing it, dates, comments, URLs, etc. The {@link Format},
+ * however, is not part of the metadata because a {@link Source} already exposes
+ * it.
+ * <p/>
+ * Metadata, once created, is immutable.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+public class Metadata {
+
+       /** The artist performing the content. */
+       private final Optional<String> artist;
+
+       /** The name of the content. */
+       private final Optional<String> name;
+
+       /** Creates empty metadata. */
+       public Metadata() {
+               this(null, null);
+       }
+
+       /**
+        * Creates metadata with the given attributes.
+        *
+        * @param artist
+        *              The artist performing the content (may be {@code null})
+        * @param name
+        *              The name of the content (may be {@code null})
+        */
+       private Metadata(String artist, String name) {
+               this.artist = Optional.fromNullable(artist);
+               this.name = Optional.fromNullable(name);
+       }
+
+       /**
+        * Returns the artist, if any.
+        *
+        * @return The artist, or {@link Optional#absent()}
+        */
+       public Optional<String> artist() {
+               return artist;
+       }
+
+       /**
+        * Returns new metadata with the same attributes as this metadata, except for
+        * the artist.
+        *
+        * @param artist
+        *              The new artist
+        * @return New metadata with a changed artist
+        */
+       public Metadata artist(String artist) {
+               return new Metadata(artist, this.artist.orNull());
+       }
+
+       /**
+        * Returns the name of the content, if any.
+        *
+        * @return The name, or {@link Optional#absent()}
+        */
+       public Optional<String> name() {
+               return name;
+       }
+
+       /**
+        * Returns new metadata with the same attributes as this metadata, except for
+        * the name.
+        *
+        * @param name
+        *              The new name
+        * @return New metadata with a changed name
+        */
+       public Metadata name(String name) {
+               return new Metadata(name, this.name.orNull());
+       }
+
+}