package de.intevation.flys.exports;

import java.io.IOException;
import java.io.OutputStream;

import org.apache.log4j.Logger;

import org.w3c.dom.Document;

import de.intevation.artifacts.Artifact;
import de.intevation.artifacts.CallContext;


/**
 * The base class for chart creation. It should provide some basic things that
 * equal in all chart types.
 *
 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
 */
public abstract class ChartGenerator implements OutGenerator {

    private static Logger logger = Logger.getLogger(ChartGenerator.class);


    /** The document of the incoming out() request.*/
    protected Document request;

    /** The output stream where the data should be written to.*/
    protected OutputStream out;

    /** The CallContext object.*/
    protected CallContext context;


    public void init(Document request, OutputStream out, CallContext context) {
        logger.debug("ChartGenerator.init");

        this.request = request;
        this.out     = out;
        this.context = context;
    }


    public abstract void doOut(Artifact artifact, Document attr);

    public abstract void generate() throws IOException;
}
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