Bug #597: ResultSet.next() throws NullPointerException

Craig Brown (cbrown@ecmarket.com) reports a bug with a severity of 2
The lower the number the more severe it is.

Short Description
ResultSet.next() throws NullPointerException

Long Description
When invoking the next() method on a ResultSet that has been closed a NullPointerException is thrown.  Ideally, an
SQLExceptionstating that the ResultSet has been closed should be thrown. 

This bug affects several other methods within the jdbc2/ResultSet class.

Sample Code
This patch fixes the above described problem.

*** ./src/interfaces/jdbc/org/postgresql/errors.properties.orig Tue Feb 19 17:54:02 2002
--- ./src/interfaces/jdbc/org/postgresql/errors.properties      Tue Feb 19 17:49:55 2002
***************
*** 54,59 ****
--- 54,60 ----
  postgresql.res.badshort:Bad Short {0}
  postgresql.res.badtime:Bad Time {0}
  postgresql.res.badtimestamp:Bad Timestamp Format at {0} in {1}
+ postgresql.res.closed:The ResultSet has been closed.
  postgresql.res.colname:The column name {0} not found.
  postgresql.res.colrange:The column index is out of range.
  postgresql.serial.interface:You cannot serialize an interface.
*** ./src/interfaces/jdbc/org/postgresql/jdbc2/ResultSet.java.orig      Tue Feb 19 17:53:46 2002
--- ./src/interfaces/jdbc/org/postgresql/jdbc2/ResultSet.java   Tue Feb 19 17:50:12 2002
***************
*** 110,115 ****
--- 110,118 ----
         */
        public boolean next() throws SQLException
        {
+               if (rows == null)
+                       throw new PSQLException("postgresql.res.closed");
+
                if (++current_row >= rows.size())
                        return false;
                this_row = (byte [][])rows.elementAt(current_row);
***************
*** 702,707 ****
--- 705,713 ----
         */
        public java.sql.ResultSetMetaData getMetaData() throws SQLException
        {
+               if (rows == null)
+                       throw new PSQLException("postgresql.res.closed");
+
                return new ResultSetMetaData(rows, fields);
        }

***************
*** 828,833 ****
--- 834,841 ----
                // index is 1-based, but internally we use 0-based indices
                int internalIndex;

+               if (rows == null)
+                       throw new PSQLException("postgresql.res.closed");
                if (index == 0)
                        throw new SQLException("Cannot move to index of 0");

***************
*** 866,871 ****
--- 874,882 ----

        public void afterLast() throws SQLException
        {
+               if (rows == null)
+                       throw new PSQLException("postgresql.res.closed");
+
                final int rows_size = rows.size();
                if (rows_size > 0)
                        current_row = rows_size;
***************
*** 873,878 ****
--- 884,892 ----

        public void beforeFirst() throws SQLException
        {
+               if (rows == null)
+                       throw new PSQLException("postgresql.res.closed");
+
                if (rows.size() > 0)
                        current_row = -1;
        }
***************
*** 891,896 ****
--- 905,913 ----

        public boolean first() throws SQLException
        {
+               if (rows == null)
+                       throw new PSQLException("postgresql.res.closed");
+
                if (rows.size() <= 0)
                        return false;
                current_row = 0;
***************
*** 1035,1040 ****
--- 1052,1060 ----

        public int getFetchSize() throws SQLException
        {
+               if (rows == null)
+                       throw new PSQLException("postgresql.res.closed");
+
                // new in 7.1: In this implementation we return the entire result set, so
                // here return the number of rows we have. Sub-classes can return a proper
                // value
***************
*** 1078,1083 ****
--- 1098,1106 ----

        public int getRow() throws SQLException
        {
+               if (rows == null)
+                       throw new PSQLException("postgresql.res.closed");
+
                final int rows_size = rows.size();

                if (current_row < 0 || current_row >= rows_size)
***************
*** 1108,1135 ****
--- 1131,1173 ----

        public boolean isAfterLast() throws SQLException
        {
+               if (rows == null)
+                       throw new PSQLException("postgresql.res.closed");
+
                final int rows_size = rows.size();
                return (current_row >= rows_size && rows_size > 0);
        }

        public boolean isBeforeFirst() throws SQLException
        {
+               if (rows == null)
+                       throw new PSQLException("postgresql.res.closed");
+
                return (current_row < 0 && rows.size() > 0);
        }

        public boolean isFirst() throws SQLException
        {
+               if (rows == null)
+                       throw new PSQLException("postgresql.res.closed");
+
                return (current_row == 0 && rows.size() >= 0);
        }
        public boolean isLast() throws SQLException
        {
+               if (rows == null)
+                       throw new PSQLException("postgresql.res.closed");
+
                final int rows_size = rows.size();
                return (current_row == rows_size - 1 && rows_size > 0);
        }

        public boolean last() throws SQLException
        {
+               if (rows == null)
+                       throw new PSQLException("postgresql.res.closed");
+
                final int rows_size = rows.size();
                if (rows_size <= 0)
                        return false;
***************
*** 1152,1157 ****

--- 1190,1198 ----

        public boolean previous() throws SQLException
        {
+               if (rows == null)
+                       throw new PSQLException("postgresql.res.closed");
+
                if (--current_row < 0)
                        return false;
                this_row = (byte [][])rows.elementAt(current_row);


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