SwExportFacade.java

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package com.arcle.rmt.j2se.bridge.swexport;
import java.util.List;
import java.util.Iterator;
import java.util.Arrays;
import java.lang.ref.SoftReference;


import com.arcle.rmt.j2se.bridge.swexport.rqml.*;
import com.arcle.rmt.superwaba.model.Document;
import com.arcle.rmt.rqml.RQMLFirstClass;

public final class SwExportFacade {
    private SwExportFacade() { }

    public boolean export(RQMLFirstClass srcElem, Document dest) {
        Iterator iter = getExporters().iterator();
        boolean succeed = false;
        // try each exporter until one is successful
        while (iter.hasNext() && !succeed) {
            FirstClassExporter exporter = (FirstClassExporter) iter.next();
            succeed = exporter.export(srcElem, dest);
        }
        return succeed;
    }

    //-----------------------------------------------------------------------

    protected synchronized List getExporters() {
        List exp = (List) _exporters.get();
        if (exp == null) {
            exp = createExporters();
            _exporters = new SoftReference(exp);
        }
        return exp;
    }

    public synchronized static SwExportFacade getInstance() {
        if (_instance == null) {
            _instance = new SwExportFacade();
        }
        return _instance;
    }

    //-----------------------------------------------------------------------

    protected List createExporters() {
        return Arrays.asList(new FirstClassExporter[] {
            new RequirementExport(),
            new UsecaseExport(),
            new StakeholderExport(),
            new AssumptionExport(),
            new IssueExport(),
            new LexiconExport(),
            new ContextExport(),
            new TaxonomyExport(),
            new ProjectExport()
        });
    }

    //-----------------------------------------------------------------------

    private SoftReference _exporters = new SoftReference(null);

    private static SwExportFacade _instance = null;
}

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