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SciJava Common is a shared library for SciJava software. It provides a plugin framework, with an extensible mechanism for service discovery, backed by its own annotation processor, so that plugins can be loaded dynamically. It is used by downstream projects in the SciJava ecosystem, such as ImageJ and SCIFIO.
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package org.scijava.console;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
/**
* A {@code MultiOutputStream} is a collection of constituent
* {@link OutputStream} objects, to which all output is forwarded.
*
* Thanks to Ian F. Darwin for his implementation of a similar concept.
*
*
* @author Curtis Rueden
*/
public class MultiOutputStream extends OutputStream {
private final ArrayList streams;
private OutputStream[] cachedStreams;
/**
* Forwards output to a list of output streams.
*
* @param os Output streams which will receive this stream's output.
*/
public MultiOutputStream(final OutputStream... os) {
streams = new ArrayList<>(os.length);
for (int i = 0; i < os.length; i++) {
streams.add(os[i]);
}
cacheStreams();
}
// -- MultiOutputStream methods --
/** Adds an output stream to those receiving this stream's output. */
public void addOutputStream(final OutputStream os) {
synchronized (streams) {
streams.add(os);
cacheStreams();
}
}
/** Removes an output stream from those receiving this stream's output. */
public void removeOutputStream(final OutputStream os) {
synchronized (streams) {
streams.remove(os);
cacheStreams();
}
}
// -- OutputStream methods --
@Override
public void write(final int b) throws IOException {
final OutputStream[] toWrite = cachedStreams;
for (final OutputStream stream : toWrite)
stream.write(b);
}
@Override
public void write(final byte[] buf, final int off, final int len)
throws IOException
{
final OutputStream[] toWrite = cachedStreams;
for (final OutputStream stream : toWrite)
stream.write(buf, off, len);
}
// -- Closeable methods --
@Override
public void close() throws IOException {
final OutputStream[] toClose = cachedStreams;
for (final OutputStream stream : toClose)
stream.close();
}
// -- Flushable methods --
@Override
public void flush() throws IOException {
final OutputStream[] toFlush = cachedStreams;
for (final OutputStream stream : toFlush)
stream.flush();
}
// -- Helper methods --
private void cacheStreams() {
cachedStreams = streams.toArray(new OutputStream[streams.size()]);
}
}