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/*-------------------------------------------------------------------------
*
* Copyright (c) 2009, PostgreSQL Global Development Group
*
* IDENTIFICATION
* $PostgreSQL: pgjdbc/org/postgresql/copy/PGCopyOutputStream.java,v 1.1 2009/07/01 05:00:39 jurka Exp $
*
*-------------------------------------------------------------------------
*/
package org.postgresql.copy;
import java.io.IOException;
import java.io.OutputStream;
import java.sql.SQLException;
import org.postgresql.PGConnection;
import org.postgresql.util.GT;
/**
* OutputStream for buffered input into a PostgreSQL COPY FROM STDIN operation
*/
public class PGCopyOutputStream extends OutputStream implements CopyIn {
private CopyIn op;
private final byte[] copyBuffer;
private final byte[] singleByteBuffer = new byte[1];
private int at = 0;
/**
* Uses given connection for specified COPY FROM STDIN operation
* @param connection database connection to use for copying (protocol version 3 required)
* @param sql COPY FROM STDIN statement
* @throws SQLException if initializing the operation fails
*/
public PGCopyOutputStream(PGConnection connection, String sql) throws SQLException {
this(connection, sql, CopyManager.DEFAULT_BUFFER_SIZE);
}
/**
* Uses given connection for specified COPY FROM STDIN operation
* @param connection database connection to use for copying (protocol version 3 required)
* @param sql COPY FROM STDIN statement
* @param bufferSize try to send this many bytes at a time
* @throws SQLException if initializing the operation fails
*/
public PGCopyOutputStream(PGConnection connection, String sql, int bufferSize) throws SQLException {
this(connection.getCopyAPI().copyIn(sql), bufferSize);
}
/**
* Use given CopyIn operation for writing
* @param op COPY FROM STDIN operation
*/
public PGCopyOutputStream(CopyIn op) {
this(op, CopyManager.DEFAULT_BUFFER_SIZE);
}
/**
* Use given CopyIn operation for writing
* @param op COPY FROM STDIN operation
* @param bufferSize try to send this many bytes at a time
*/
public PGCopyOutputStream(CopyIn op, int bufferSize) {
this.op = op;
copyBuffer = new byte[bufferSize];
}
public void write(int b) throws IOException {
checkClosed();
if(b<0 || b>255)
throw new IOException(GT.tr("Cannot write to copy a byte of value {0}", new Integer(b)));
singleByteBuffer[0] = (byte)b;
write(singleByteBuffer, 0, 1);
}
public void write(byte[] buf) throws IOException {
write(buf, 0, buf.length);
}
public void write(byte[] buf, int off, int siz) throws IOException {
checkClosed();
try {
writeToCopy(buf, off, siz);
} catch(SQLException se) {
IOException ioe = new IOException("Write to copy failed.");
ioe.initCause(se);
throw ioe;
}
}
private void checkClosed() throws IOException {
if (op == null) {
throw new IOException(GT.tr("This copy stream is closed."));
}
}
public void close() throws IOException {
// Don't complain about a double close.
if (op == null)
return;
try{
endCopy();
} catch(SQLException se) {
IOException ioe = new IOException("Ending write to copy failed.");
ioe.initCause(se);
throw ioe;
}
op = null;
}
public void flush() throws IOException {
try {
op.writeToCopy(copyBuffer, 0, at);
at = 0;
op.flushCopy();
} catch (SQLException e) {
IOException ioe = new IOException("Unable to flush stream");
ioe.initCause(e);
throw ioe;
}
}
public void writeToCopy(byte[] buf, int off, int siz) throws SQLException {
if(at > 0 && siz > copyBuffer.length - at) { // would not fit into rest of our buf, so flush buf
op.writeToCopy(copyBuffer, 0, at);
at = 0;
}
if(siz > copyBuffer.length) { // would still not fit into buf, so just pass it through
op.writeToCopy(buf, off, siz);
} else { // fits into our buf, so save it there
System.arraycopy(buf, off, copyBuffer, at, siz);
at += siz;
}
}
public int getFormat() {
return op.getFormat();
}
public int getFieldFormat(int field) {
return op.getFieldFormat(field);
}
public void cancelCopy() throws SQLException {
op.cancelCopy();
}
public int getFieldCount() {
return op.getFieldCount();
}
public boolean isActive() {
return op.isActive();
}
public void flushCopy() throws SQLException {
op.flushCopy();
}
public long endCopy() throws SQLException {
if(at > 0) {
op.writeToCopy(copyBuffer, 0, at);
}
op.endCopy();
return getHandledRowCount();
}
public long getHandledRowCount() {
return op.getHandledRowCount();
}
}
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