Add connection.

diff --git a/src/main/java/net/pterodactylus/sonitus/data/Connection.java b/src/main/java/net/pterodactylus/sonitus/data/Connection.java
new file mode 100644 (file)
index 0000000..b8bee32
--- /dev/null
+++ b/src/main/java/net/pterodactylus/sonitus/data/Connection.java
@@ -0,0 +1,85 @@
+/*
+ * Sonitus - Connection.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 java.io.IOException;
+
+/**
+ * A connection reads bytes from a {@link Source} and feeds it to a sink. This
+ * class is meant to be subclassed by each {@link Sink}, overriding the {@link
+ * #feed(byte[])} method to actually feed the data into the sink. The {@link
+ * #feed(byte[])} method is also responsible for blocking for an appropriate
+ * amount of time; this method determines how fast a {@link Source} is
+ * consumed.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+public abstract class Connection implements Runnable {
+
+       /** The source to consume. */
+       private final Source source;
+
+       /**
+        * Creates a new connection that will read from the given source.
+        *
+        * @param source
+        *              The source to read
+        */
+       public Connection(Source source) {
+               this.source = source;
+       }
+
+       //
+       // RUNNABLE METHODS
+       //
+
+       @Override
+       public void run() {
+               while (true) {
+                       try {
+                               byte[] buffer = source.get(bufferSize());
+                               feed(buffer);
+                       } catch (IOException e) {
+                               return;
+                       }
+               }
+       }
+
+       //
+       // SUBCLASS METHODS
+       //
+
+       /**
+        * Returns the number of bytes that will be requested from the source.
+        *
+        * @return The number of bytes that will be requested from the source
+        */
+       protected abstract int bufferSize();
+
+       /**
+        * Feeds the read data into the sink. The given buffer is always filled and
+        * never contains excess elements.
+        *
+        * @param buffer
+        *              The data
+        * @throws IOException
+        *              if an I/O error occurs
+        */
+       protected abstract void feed(byte[] buffer) throws IOException;
+
+}