Examples of ptolemy.data.expr.FileParameter.asURL()

ptolemy.data.expr.FileParameter.asURL()
Return the file as a URL. If the file name is relative, then it is interpreted as being relative to the directory returned by getBaseDirectory(). If the name begins with "$CLASSPATH", then search for the file relative to the classpath. If no file is found, then it throws an exception. @return A URL, or null if no file name or URL has been specified. @exception IllegalActionException If the file cannot be read, orif the file cannot be represented as a URL (e.g. System.in), or the name specification cannot be parsed.

     */
    protected void _help() {
        try {
            FileParameter helpAttribute = (FileParameter) getModel()
                    .getAttribute("_help", FileParameter.class);
            URL doc = helpAttribute.asURL();
            getConfiguration().openModel(null, doc, doc.toExternalForm());
        } catch (Exception ex) {
            super._help();
        }
    }

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            FileParameter helpAttribute = (FileParameter) configuration
                    .getAttribute("_helpDocViewer", FileParameter.class);
            URL doc;


            if (helpAttribute != null) {
                doc = helpAttribute.asURL();
            } else {
                doc = getClass().getClassLoader().getResource(helpFile);
            }


            configuration.openModel(null, doc, doc.toExternalForm());

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        // attribute of the configuration.
        // If we don't have an _about, or _about returns
        // no models, then look in the complete demos location


        if (aboutAttribute != null) {
            baseURL = aboutAttribute.asURL();
            String aboutURLString = baseURL.toExternalForm();
            String base = aboutURLString.substring(0,
                    aboutURLString.lastIndexOf("/"));
            baseURL = MoMLApplication.specToURL(base + "/intro.htm");
            System.out.println("HTMLAbout._expandLibrary(): looking in about URL: " + baseURL);

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            if (fileOrURLParameter == null) {
                throw new InternalErrorException(object, null,
                        "No \"fileOrURL\" attribute.");
            } else {
                try {
                    if (fileOrURLParameter.asURL() == null) {
                        ModelDirectory directory = configuration.getDirectory();


                        StringParameter initialDefaultContentsParameter = (StringParameter) object
                                .getAttribute("initialDefaultContents");
                        String defaultText = "";

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        _icon = new ImageIcon(this, "_icon");
        _icon.setPersistent(false);
        FileParameter source = new FileParameter(this, "source");
        source
                .setExpression("$CLASSPATH/ptolemy/vergil/kernel/attributes/ptIIplanetIcon.gif");
        URL url = source.asURL();
        Toolkit tk = Toolkit.getDefaultToolkit();
        Image image = tk.getImage(url);
        _icon.setImage(image);
    }

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                FileParameter aboutAttribute = (FileParameter) configuration
                        .getAttribute("_about", FileParameter.class);
                URL doc;


                if (aboutAttribute != null) {
                    doc = aboutAttribute.asURL();
                } else {
                    doc = getClass().getClassLoader().getResource(aboutFile);
                }


                // The usual mechanism for opening a file is:

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                Configuration configuration = getConfiguration();
                FileParameter iconAttribute = (FileParameter) configuration
                        .getAttribute("_applicationIcon", FileParameter.class);


                if (iconAttribute != null) {
                    url = iconAttribute.asURL();
                }
            } catch (Throwable ex) {
                // Ignore, we will set url to the default.
            }
            if (url == null) {

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            FileParameter helpAttribute = (FileParameter) configuration
                    .getAttribute("_help", FileParameter.class);
            URL doc;


            if (helpAttribute != null) {
                doc = helpAttribute.asURL();
            } else {
                doc = getClass().getClassLoader().getResource(helpFile);
            }


            configuration.openModel(null, doc, doc.toExternalForm());

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