X-Git-Url: https://git.pterodactylus.net/?a=blobdiff_plain;f=src%2Fmain%2Fjava%2Fde%2Ftodesbaum%2Futil%2Fio%2FTeeOutputStream.java;fp=src%2Fmain%2Fjava%2Fde%2Ftodesbaum%2Futil%2Fio%2FTeeOutputStream.java;h=78860dc7918fd3a11e92ce65038d44eef9d1f475;hb=38bdc433e50669e8244a63b5af59e597f88f1d29;hp=0000000000000000000000000000000000000000;hpb=f14b9fbe6d88e23920b10a75ebeba4d38390301b;p=jSite.git

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
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);
+		}
+	}
+
+}