org.glassfish.jersey.message.internal.CommittingOutputStream Maven / Gradle / Ivy
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package org.glassfish.jersey.message.internal;
import java.io.IOException;
import java.io.OutputStream;
/**
* An abstract committing output stream adapter that performs a
* {@link OutboundMessageContext.StreamProvider#commit() commit} and then retrieves the
* {@link OutboundMessageContext.StreamProvider#getOutputStream() provided output} stream
* before the first byte is written to the provided stream.
*
* Concrete implementations of the class typically override the commit operation
* to perform any initialization on the adapted output stream.
*
*
* @author Paul Sandoz
* @author Marek Potociar (marek.potociar at oracle.com)
*/
final class CommittingOutputStream extends OutputStream {
/**
* Adapted output stream.
*/
private OutputStream adaptedOutput;
/**
* Determines whether the stream was already committed or not.
*/
private boolean isCommitted = false;
/**
* Stream provider.
*/
private OutboundMessageContext.StreamProvider streamProvider;
/**
* Construct a new committing output stream using a deferred initialization
* of the adapted output stream via
* {@link org.glassfish.jersey.message.internal.OutboundMessageContext.StreamProvider stream provider}.
*/
public CommittingOutputStream() {
}
/**
* Set the output stream provider.
*
* @param streamProvider output stream provider.
*/
public void setStreamProvider(OutboundMessageContext.StreamProvider streamProvider) {
this.streamProvider = streamProvider;
}
/**
* Determines whether the stream was already committed or not.
*
* @return {@code true} if this stream was already committed, {@code false} otherwise.
*/
public boolean isCommitted() {
return isCommitted;
}
@Override
public void write(byte b[]) throws IOException {
if (b.length > 0) {
commitWrite();
adaptedOutput.write(b);
}
}
@Override
public void write(byte b[], int off, int len) throws IOException {
if (len > 0) {
commitWrite();
adaptedOutput.write(b, off, len);
}
}
@Override
public void write(int b) throws IOException {
commitWrite();
adaptedOutput.write(b);
}
@Override
public void flush() throws IOException {
commitWrite();
adaptedOutput.flush();
}
@Override
public void close() throws IOException {
commitWrite();
adaptedOutput.close();
}
private void commitWrite() throws IOException {
if (!isCommitted) {
isCommitted = true;
streamProvider.commit();
if (adaptedOutput == null) {
adaptedOutput = streamProvider.getOutputStream();
}
}
}
}