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package org.postgresql.largeobject;
import java.io.IOException;
import java.io.OutputStream;
import java.sql.SQLException;
/**
* This implements a basic output stream that writes to a LargeObject
*/
public class BlobOutputStream extends OutputStream {
/**
* The parent LargeObject
*/
private LargeObject lo;
/**
* Buffer
*/
private byte buf[];
/**
* Size of the buffer (default 1K)
*/
private int bsize;
/**
* Position within the buffer
*/
private int bpos;
/**
* Create an OutputStream to a large object
* @param lo LargeObject
*/
public BlobOutputStream(LargeObject lo) {
this(lo,1024);
}
/**
* Create an OutputStream to a large object
* @param lo LargeObject
* @param bsize The size of the buffer used to improve performance
*/
public BlobOutputStream(LargeObject lo,int bsize) {
this.lo=lo;
this.bsize=bsize;
buf=new byte[bsize];
bpos=0;
}
public void write(int b) throws java.io.IOException {
try {
if(bpos>=bsize) {
lo.write(buf);
bpos=0;
}
buf[bpos++]=(byte)b;
} catch(SQLException se) {
throw new IOException(se.toString());
}
}
/**
* Flushes this output stream and forces any buffered output bytes
* to be written out. The general contract of <code>flush</code> is
* that calling it is an indication that, if any bytes previously
* written have been buffered by the implementation of the output
* stream, such bytes should immediately be written to their
* intended destination.
*
* @exception IOException if an I/O error occurs.
*/
public void flush() throws IOException {
try {
if(bpos>0)
lo.write(buf,0,bpos);
bpos=0;
} catch(SQLException se) {
throw new IOException(se.toString());
}
}
/**
* Closes this output stream and releases any system resources
* associated with this stream. The general contract of <code>close</code>
* is that it closes the output stream. A closed stream cannot perform
* output operations and cannot be reopened.
* <p>
* The <code>close</code> method of <code>OutputStream</code> does nothing.
*
* @exception IOException if an I/O error occurs.
*/
public void close() throws IOException {
try {
flush();
lo.close();
lo=null;
} catch(SQLException se) {
throw new IOException(se.toString());
}
}
}
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