com.sun.jersey.api.client.CommittingOutputStream Maven / Gradle / Ivy
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package com.sun.jersey.api.client;
import java.io.IOException;
import java.io.OutputStream;
/**
* A commiting output stream that commits before
* the first byte is written to the adapted {@link OutputStream}.
*
* This class may be overridden to provide the commit functionality.
*
* @author [email protected]
*/
public abstract class CommittingOutputStream extends OutputStream {
private OutputStream o;
private boolean isCommitted;
/**
* Construct a new instance.
*
* The method {@link #getOutputStream() } MUST be overridden
* to return an output stream.
*/
public CommittingOutputStream() {
}
/**
* Construct a new instance with an output stream to adapt.
*
* @param o the adapted output stream.
* @throws IllegalArgumentException if o is null.
*/
public CommittingOutputStream(OutputStream o) {
if (o == null)
throw new IllegalArgumentException();
this.o = o;
}
@Override
public void write(byte b[]) throws IOException {
commitWrite();
o.write(b);
}
@Override
public void write(byte b[], int off, int len) throws IOException {
commitWrite();
o.write(b, off, len);
}
public void write(int b) throws IOException {
commitWrite();
o.write(b);
}
@Override
public void flush() throws IOException {
commitWrite();
o.flush();
}
@Override
public void close() throws IOException {
commitWrite();
o.close();
}
private void commitWrite() throws IOException {
if (!isCommitted) {
isCommitted = true;
commit();
if (o == null)
o = getOutputStream();
}
}
/**
* Get the adapted output stream.
*
* This method MUST be overriden if the empty constructor is
* utilized to construct an instance of this class.
*
* @return the adapted output stream.
* @throws java.io.IOException
*/
protected OutputStream getOutputStream() throws IOException {
throw new IllegalStateException();
}
/**
* Perform the commit functionality.
*
* @throws java.io.IOException
*/
protected abstract void commit() throws IOException;
};