Create an opaque type using default support functions

The following example creates an opaque type named Circle, using an existing Java™ class and using the default support functions provided in the database server:

*/

import java.sql.*;
import com.informix.jdbc.IfmxUDTSQLInput;
import com.informix.jdbc.IfmxUDTSQLOutput;

public class Circle implements SQLData
{
    private static double PI = 3.14159;

    double x;           // x coordinate
    double y;           // y coordinate
    double radius;

    private String type = "circle";

    public String getSQLTypeName() { return type; }

    public void readSQL(SQLInput stream, String typeName)
        throws SQLException
    {
        // To be able to use the DEFAULT support functions supplied
        // by the server, you must cast the stream to IfmxUDTSQLInput.
        // (Server requirement)

        IfmxUDTSQLInput in = (IfmxUDTSQLInput) stream;
        x = in.readDouble();
        y = in.readDouble();
        radius = in.readDouble();
    }

    public void writeSQL(SQLOutput stream) throws SQLException
    {
        // To be able to use the DEFAULT support functions supplied
        // by the server, have to cast the stream to IfmxUDTSQLOutput.
        // (Server requirement)

        IfmxUDTSQLOutput out = (IfmxUDTSQLOutput) stream;
        out.writeDouble(x);
        out.writeDouble(y);
        out.writeDouble(radius);
    }
 
    public static double area(Circle c)
    {
        return PI * c.radius * c.radius;
    }
       
}