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/*
 * Jython Database Specification API 2.0
 *
 *
 * Copyright (c) 2001 brian zimmer 
 *
 */
package com.ziclix.python.sql.pipe;

import org.python.core.PyObject;

/**
 * A Source produces data to be consumed by a Sink.  The data can be generated
 * from anywhere, but must follow the format detail in next().
 *
 * @author brian zimmer
 * @see #next
 * @see Sink
 */
public interface Source {

    /**
     * Invoked at the start of processing.
     */
    public void start();

    /**
     * Return the next row from the source.
     * The following format:

     *   [(colName, colType), (colName, colType), ...]
     * for headers and:

     *   [(col), (colName, colType), ...]
     * for all other data must be used.
     */
    public PyObject next();

    /**
     * Invoked at the end of processing.  This method is guarenteed to be called.
     */
    public void end();
}