SwImportFacade.java

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package com.arcle.rmt.j2se.bridge.swimport;

import java.util.Iterator;
import java.util.Collection;
import java.util.Arrays;
import java.io.PrintWriter;
import java.lang.ref.SoftReference;

import com.arcle.rmt.j2se.bridge.swimport.rqml.*;
import com.arcle.rmt.superwaba.model.Document;
import com.arcle.rmt.j2se.model.RQMLDocument;

public final class SwImportFacade {
    private SwImportFacade() {  }

    public boolean importFirstClass(Document srcDoc,
            RQMLDocument dstDoc, PrintWriter log) {
        boolean ok = true;
        boolean success;
        Iterator iter = getImporters().iterator();
        while (iter.hasNext()) {
            FirstClassImporter importer = (FirstClassImporter) iter.next();
            success = importer.importFirstClass(srcDoc, dstDoc);
            if (!success) {
                log.println("Import failed for: " + importer);
            }
            ok &= success;
        }
        return ok;
    }

    //-----------------------------------------------------------------------
    // Accessor Methods

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

    protected synchronized Collection getImporters() {
        Collection imp = (Collection) _importers.get();
        if (imp == null) {
            imp = createImporters();
            _importers = new SoftReference(imp);
        }
        return imp;
    }

    //-----------------------------------------------------------------------
    // Factory methods

    protected Collection createImporters() {
        return Arrays.asList(new FirstClassImporter[] {
            new RequirementImport(),
            new UsecaseImport(),
            new StakeholderImport(),
            new AssumptionImport(),
            new IssueImport(),
            new LexiconImport(),
            new ContextImport(),
            new TaxonomyImport(),
            new ProjectImport()
        });
    }

    //-----------------------------------------------------------------------
    // Member variables

    private SoftReference _importers = new SoftReference(null);

    private static SwImportFacade _instance = null;
}

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