class PDPropBuild implements COSObjectable
{
    private final COSDictionary dictionary;

    /**
     * Default constructor.
     */
    public PDPropBuild()
    {
        dictionary = new COSDictionary();
        dictionary.setDirect(true); // the specification claim to use direct objects
    }

    /**
     * Constructor.
     *
     * @param dict The signature dictionary.
     */
    public PDPropBuild(COSDictionary dict)
    {
        dictionary = dict;
        dictionary.setDirect(true); // the specification claim to use direct objects
    }

    /**
     * Convert this standard java object to a COS dictionary.
     *
     * @return The COS dictionary that matches this Java object.
     */
    @Override
    public COSDictionary getCOSObject()
    {
        return dictionary;
    }

    /**
     * A build data dictionary for the signature handler that was
     * used to create the parent signature.
     *
     * @return the Filter as PDPropBuildFilter object
     */
    public PDPropBuildDataDict getFilter()
    {
        PDPropBuildDataDict filter = null;
        COSDictionary filterDic = dictionary.getCOSDictionary(COSName.FILTER);
        if (filterDic != null)
        {
            filter = new PDPropBuildDataDict(filterDic);
        }
        return filter;
    }

    /**
     * Set the build data dictionary for the signature handler.
     * This entry is optional but is highly recommended for the signatures.
     *
     * @param filter is the PDPropBuildFilter
     */
    public void setPDPropBuildFilter(PDPropBuildDataDict filter)
    {
        dictionary.setItem(COSName.FILTER, filter);
    }

    /**
     * A build data dictionary for the PubSec software module
     * that was used to create the parent signature.
     *
     * @return the PubSec as PDPropBuildPubSec object
     */
    public PDPropBuildDataDict getPubSec()
    {
        PDPropBuildDataDict pubSec = null;
        COSDictionary pubSecDic = dictionary.getCOSDictionary(COSName.PUB_SEC);
        if (pubSecDic != null)
        {
            pubSec = new PDPropBuildDataDict(pubSecDic);
        }
        return pubSec;
    }

    /**
     * Set the build data dictionary for the PubSec Software module.
     *
     * @param pubSec is the PDPropBuildPubSec
     */
    public void setPDPropBuildPubSec(PDPropBuildDataDict pubSec)
    {
        dictionary.setItem(COSName.PUB_SEC, pubSec);
    }

    /**
     * A build data dictionary for the viewing application software
     * module that was used to create the parent signature.
     *
     * @return the App as PDPropBuildApp object
     */
    public PDPropBuildDataDict getApp()
    {<FILL_FUNCTION_BODY>}

    /**
     * Set the build data dictionary for the viewing application
     * software module.
     *
     * @param app is the PDPropBuildApp
     */
    public void setPDPropBuildApp(PDPropBuildDataDict app)
    {
        dictionary.setItem(COSName.APP, app);
    }
}

        PDPropBuildDataDict app = null;
        COSDictionary appDic = dictionary.getCOSDictionary(COSName.APP);
        if (appDic != null)
        {
            app = new PDPropBuildDataDict(appDic);
        }
        return app;
    
<no_super_class>