Merge branch 'release-0.11'

[jSite.git] / src / main / java / de / todesbaum / util / io / TeeOutputStream.java

diff --git a/src/main/java/de/todesbaum/util/io/TeeOutputStream.java b/src/main/java/de/todesbaum/util/io/TeeOutputStream.java
new file mode 100644 (file)
index 0000000..78860dc
--- /dev/null
+++ b/src/main/java/de/todesbaum/util/io/TeeOutputStream.java
@@ -0,0 +1,125 @@
+/*
+ * jSite - TeeOutputStream.java - Copyright © 2010 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 de.todesbaum.util.io;
+
+import java.io.IOException;
+import java.io.OutputStream;
+
+/**
+ * {@link OutputStream} that sends all data it receives to multiple other output
+ * streams. If an error occurs during a {@link #write(int)} to one of the
+ * underlying output streams no guarantees are made about how much data is sent
+ * to each stream, i.e. there is no good way to recover from such an error.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+public class TeeOutputStream extends OutputStream {
+
+       /** The output streams. */
+       private final OutputStream[] outputStreams;
+
+       /**
+        * Creates a new tee output stream that sends all to all given output
+        * streams.
+        *
+        * @param outputStreams
+        *            The output streams to send all data to
+        */
+       public TeeOutputStream(OutputStream... outputStreams) {
+               this.outputStreams = outputStreams;
+       }
+
+       /**
+        * {@inheritDoc}
+        * <p>
+        * An effort is made to close all output streams. If multiple exceptions
+        * occur, only the first exception is thrown after all output streams have
+        * been tried to close.
+        */
+       @Override
+       public void close() throws IOException {
+               IOException occuredException = null;
+               for (OutputStream outputStream : outputStreams) {
+                       try {
+                               outputStream.flush();
+                       } catch (IOException ioe1) {
+                               if (occuredException == null) {
+                                       occuredException = ioe1;
+                               }
+                       }
+               }
+               if (occuredException != null) {
+                       throw occuredException;
+               }
+       }
+
+       /**
+        * {@inheritDoc}
+        * <p>
+        * An effort is made to flush all output streams. If multiple exceptions
+        * occur, only the first exception is thrown after all output streams have
+        * been tried to flush.
+        */
+       @Override
+       public void flush() throws IOException {
+               IOException occuredException = null;
+               for (OutputStream outputStream : outputStreams) {
+                       try {
+                               outputStream.flush();
+                       } catch (IOException ioe1) {
+                               if (occuredException == null) {
+                                       occuredException = ioe1;
+                               }
+                       }
+               }
+               if (occuredException != null) {
+                       throw occuredException;
+               }
+       }
+
+       /**
+        * {@inheritDoc}
+        */
+       @Override
+       public void write(byte[] buffer) throws IOException {
+               for (OutputStream outputStream : outputStreams) {
+                       outputStream.write(buffer);
+               }
+       }
+
+       /**
+        * {@inheritDoc}
+        */
+       @Override
+       public void write(byte[] buffer, int offset, int length) throws IOException {
+               for (OutputStream outputStream : outputStreams) {
+                       outputStream.write(buffer, offset, length);
+               }
+       }
+
+       /**
+        * {@inheritDoc}
+        */
+       @Override
+       public void write(int data) throws IOException {
+               for (OutputStream outputStream : outputStreams) {
+                       outputStream.write(data);
+               }
+       }
+
+}