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SQLite.Function Maven / Gradle / Ivy

package SQLite;

/**
 * Callback interface for SQLite's user defined functions.
 * Each callback method receives a
 * FunctionContext object
 * which is used to set the function result or error code.
 * 

* Example:
* *
 *   class SinFunc implements SQLite.Function {
 *     public void function(SQLite.FunctionContext fc, String args[]) {
 *       try {
 *         Double d = new Double(args[0]);
 *         fc.set_result(Math.sin(d.doubleValue()));
 *       } catch (Exception e) {
 *         fc.set_error("sin(" + args[0] + "):" + e);
 *       }
 *     }
 *     ...
 *   }
 *   SQLite.Database db = new SQLite.Database();
 *   db.open("db", 0);
 *   db.create_function("sin", 1, SinFunc);
 *   ...
 *   db.exec("select sin(1.0) from test", null);
 * 
*/ public interface Function { /** * Callback for regular function. * * @param fc function's context for reporting result * @param args String array of arguments */ public void function(FunctionContext fc, String args[]); /** * Callback for one step in aggregate function. * * @param fc function's context for reporting result * @param args String array of arguments */ public void step(FunctionContext fc, String args[]); /** * Callback for final step in aggregate function. * * @param fc function's context for reporting result */ public void last_step(FunctionContext fc); }




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