Add input stream drainer.

diff --git a/src/main/java/net/pterodactylus/sonitus/io/InputStreamDrainer.java b/src/main/java/net/pterodactylus/sonitus/io/InputStreamDrainer.java
new file mode 100644 (file)
index 0000000..6c374ad
--- /dev/null
+++ b/src/main/java/net/pterodactylus/sonitus/io/InputStreamDrainer.java
@@ -0,0 +1,81 @@
+/*
+ * Sonitus - Drainer.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.io;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Arrays;
+import java.util.logging.Logger;
+
+/**
+ * {@link Runnable} implementation that simply reads an {@link InputStream}
+ * until an {@link IOException} is thrown, or the stream reaches EOF.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+public class InputStreamDrainer implements Runnable {
+
+       /** The logger. */
+       private static final Logger logger = Logger.getLogger(InputStreamDrainer.class.getName());
+
+       /** The input stream to drain. */
+       private final InputStream inputStream;
+
+       /**
+        * Creates a new input stream drainer.
+        *
+        * @param inputStream
+        *              The input stream to drain
+        */
+       public InputStreamDrainer(InputStream inputStream) {
+               this.inputStream = inputStream;
+       }
+
+       @Override
+       public void run() {
+               byte[] buffer = new byte[1024];
+               int read;
+               try {
+                       while ((read = inputStream.read(buffer)) != -1) {
+                               logger.finest(String.format("Drained %d Bytes: %s", read, filteredBuffer(Arrays.copyOf(buffer, read))));
+                       }
+               } catch (IOException ioe1) {
+                       /* ignore, just exit. */
+               }
+       }
+
+       /**
+        * Creates a string from all ASCII characters contained in the buffer.
+        *
+        * @param buffer
+        *              The buffer to create a string from
+        * @return The pure-ASCII string representation of the buffer’s content
+        */
+       private String filteredBuffer(byte[] buffer) {
+               StringBuilder filteredBuffer = new StringBuilder();
+               for (byte b : buffer) {
+                       if (b == 13) {
+                               filteredBuffer.append("\\n");
+                       } else if ((b == 9) || ((b >= 32) && (b <= 127))) {
+                               filteredBuffer.append((char) b);
+                       }
+               }
+               return filteredBuffer.toString();
+       }
+
+}