package de.intevation.flys.exports;

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

import org.apache.log4j.Logger;

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

import de.intevation.artifacts.common.utils.XMLUtils;

import de.intevation.artifactdatabase.state.Facet;

import de.intevation.flys.artifacts.FLYSArtifact;

import de.intevation.flys.artifacts.model.Calculation;

import org.w3c.dom.Document;

public class ReportGenerator
implements   OutGenerator 
{
    private static Logger logger = Logger.getLogger(ReportGenerator.class);

    protected Document     result;
    protected OutputStream out;
    protected CallContext  context;

    public ReportGenerator() {
    }

    @Override
    public void init(Document request, OutputStream out, CallContext context) {
        logger.debug("init");
        this.out     = out;
        this.context = context;
        result = XMLUtils.newDocument();
    }

    @Override
    public void setMasterArtifact(Artifact master) {
        // not needed
    }

    @Override
    public void doOut(Artifact artifact, Facet facet, Document attr) {
        logger.debug("doOut");
        facet = ((FLYSArtifact)artifact).getNativeFacet(facet);
        if (facet != null) {
            Calculation report = (Calculation)facet.getData(artifact, context);
            report.toXML(result, context.getMeta());
        }
    }

    @Override
    public void generate() throws IOException {
        logger.debug("generate");
        XMLUtils.toStream(result, out);
    }
}
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