How to use org.postgresql.copy

public long endCopy() throws SQLException {
 if (at > 0) {
  op.writeToCopy(copyBuffer, 0, at);
 }
 op.endCopy();
 return getHandledRowCount();
}

public int read(byte[] buf, int off, int siz) throws IOException {
 checkClosed();
 int got = 0;
 boolean didReadSomething = false;
 while (got < siz && (didReadSomething = gotBuf())) {
  buf[off + got++] = this.buf[at++];
 }
 return got == 0 && !didReadSomething ? -1 : got;
}

/**
 * Use COPY FROM STDIN for very fast copying from an InputStream into a database table.
 *
 * @param sql COPY FROM STDIN statement
 * @param from a CSV file or such
 * @return number of rows updated for server 8.2 or newer; -1 for older
 * @throws SQLException on database usage issues
 * @throws IOException upon input stream or database connection failure
 */
public long copyIn(final String sql, InputStream from) throws SQLException, IOException {
 return copyIn(sql, from, DEFAULT_BUFFER_SIZE);
}

public void cancelCopy() throws SQLException {
 op.cancelCopy();
}

 public long getHandledRowCount() {
  return op.getHandledRowCount();
 }
}

public int available() throws IOException {
 checkClosed();
 return (buf != null ? len - at : 0);
}

public int getFieldFormat(int field) {
 return op.getFieldFormat(field);
}

public int getFieldCount() {
 return op.getFieldCount();
}

public int read(byte[] buf) throws IOException {
 return read(buf, 0, buf.length);
}

public int getFormat() {
 return op.getFormat();
}

public int getFieldFormat(int field) {
 return op.getFieldFormat(field);
}

@Override
public boolean isClosed() {
 return closeFlag || !copyDual.isActive();
}

@Override
public byte[] readFromCopy(boolean block) throws SQLException {
 return readFromCopy();
}

/**
 * Use COPY FROM STDIN for very fast copying from a Reader into a database table.
 *
 * @param sql COPY FROM STDIN statement
 * @param from a CSV file or such
 * @return number of rows updated for server 8.2 or newer; -1 for older
 * @throws SQLException on database usage issues
 * @throws IOException upon reader or database connection failure
 */
public long copyIn(final String sql, Reader from) throws SQLException, IOException {
 return copyIn(sql, from, DEFAULT_BUFFER_SIZE);
}

public long endCopy() throws SQLException {
  if(at > 0) {
    op.writeToCopy(copyBuffer, 0, at);
  }
  op.endCopy();
  return getHandledRowCount();
}

public int read() throws IOException {
 checkClosed();
 return gotBuf() ? buf[at++] : -1;
}

public int available() throws IOException {
  checkClosed();
  return ( buf != null ? len - at : 0 );
}

/**
 * Use COPY FROM STDIN for very fast copying from an InputStream into a database table.
 * @param sql COPY FROM STDIN statement
 * @param from a CSV file or such
 * @return number of rows updated for server 8.2 or newer; -1 for older
 * @throws SQLException on database usage issues
 * @throws IOException upon input stream or database connection failure
 */
public long copyIn(final String sql, InputStream from) throws SQLException, IOException {
  return copyIn(sql, from, DEFAULT_BUFFER_SIZE);
}

public int read(byte[] buf, int off, int siz) throws IOException {
  checkClosed();
  int got = 0;
  while( got < siz && gotBuf() ) {
    buf[off+got++] = this.buf[at++];
  }
  return got;
}

/**
 * Use COPY FROM STDIN for very fast copying from a Reader into a database table.
 * @param sql COPY FROM STDIN statement
 * @param from a CSV file or such
 * @return number of rows updated for server 8.2 or newer; -1 for older
 * @throws SQLException on database usage issues
 * @throws IOException upon reader or database connection failure
 */
public long copyIn(final String sql, Reader from) throws SQLException, IOException {
  return copyIn(sql, from, DEFAULT_BUFFER_SIZE);
}