Examples of ptolemy.moml.MoMLParser$UnlinkRequest

ptolemy.moml.MoMLParser
This class constructs Ptolemy II models from specifications in MoML (modeling markup language), which is based on XML. The class contains an instance of the Microstar Ælfred XML parser and implements callback methods to interpret the parsed XML. The way to use this class is to call its parse() method. The returned value is top-level composite entity of the model.
For convenience, there are several forms of the parse method. Most of these take two arguments, a base, and some specification of the MoML to parse (a stream or the text itself). The base is used to interpret relative URLs that might be present in the MoML. For example, the base might be the document base of an applet. An applet might use this class as follows:
```
 MoMLParser parser = new MoMLParser(); URL docBase = getDocumentBase(); URL xmlFile = new URL(docBase, modelURL); NamedObj toplevel = parser.parse(docBase, xmlFile); 
```
If the first argument to parse() is null, then it is assumed that all URLs in the MoML file are absolute.
It can be difficult to create an appropriate URL to give as a base, particularly if what you have is a file or file name in the directory that you want to use as a base. The easiest technique is to use the toURL() method of the File class. Some of the URL constructors, for reasons we don't understand, create URLs that do not work.
The MoML code given to a parse() method may be a fragment, and does not need to include the "<?xml ... >" element nor the DOCTYPE specification. However, if the DOCTYPE specification is not given, then the DTD will not be read. The main consequence of this, given the parser we are using, is that default values for attributes will not be set. This could cause errors. The parser itself is not a validating parser, however, so it makes very limited use of the DTD. This may change in the future, so it is best to give the DOCTYPE element.
The parse() methods can be used for incremental parsing. After creating an initial model using a call to parse(), further MoML fragments without top-level entity or derived objects can be evaluated to modify the model. You can specify the context in which the MoML to be interpreted by calling setContext(). However, the XML parser limits each fragment to one element. So there always has to be one top-level element. If you wish to evaluate a group of MoML elements in some context, set the context and then place your MoML elements within a group element, as follows:
```
 <group> ... sequence of MoML elements ... </group> 
```
The group element is ignored, and just serves to aggregate the MoML elements, unless it has a name attribute. If it has a name attribute, then the name becomes a prefix (separated by a colon) of all the names of items immediately in the group element. If the value of the name attribute is "auto", then the group is treated specially. Each item immediately contained by the group (i.e. not deeply contained) will be created with its specified name or a modified version of that name that does not match a pre-existing object already contained by the container. That is, when name="auto" is specified, each item is forced to be created with unique name, rather than possibly matching a pre-existing item.
The parse methods throw a variety of exceptions if the parsed data does not represent a valid MoML file or if the stream cannot be read for some reason.
This parser supports the way Ptolemy II handles hierarchical models, where components are instances cloned from reference models called "classes." A model (a composite entity) is a "class" in Ptolemy II if the elementName field of its MoMLInfo object is the string "class". If a component is cloned from a class, then when that component exports MoML, it references the class from which it was cloned and exports only differences from that class. I.e., if further changes are made to the component, it is important that when the component exports MoML, that those changes are represented in the exported MoML. This effectively implements an inheritance mechanism, where a component inherits all the features of the master from which it is cloned, but then extends the model with its own changes.
This class always processes MoML commands in the following order within a "class" or "entity" element, irrespective of the order in which they appear:
1. Create properties, entities, ports and relations; and
2. Create links.
Within each category, the order of actions depends on the order in which the commands appear in the MoML text.
This class works closely with MoMLChangeRequest to implement another feature of Ptolemy II hierarchy. In particular, if an entity is cloned from another that identifies itself as a "class", then any changes that are made to the class via a MoMLChangeRequest are also made to the clone. This parser ensures that those changes are not exported when MoML is exported by the clone, because they will be exported when the master exports MoML. @see MoMLChangeRequest @author Edward A. Lee, Steve Neuendorffer, John Reekie, Contributor: Christopher Hylands @version $Id: MoMLParser.java,v 1.343 2007/12/07 06:28:36 cxh Exp $ @since Ptolemy II 0.4 @Pt.ProposedRating Red (eal) @Pt.AcceptedRating Red (johnr)

    public static Configuration readConfiguration(URL specificationURL)
            throws Exception {
        if (_initialSpecificationURL == null) {
            _initialSpecificationURL = specificationURL;
        }
        MoMLParser parser = new MoMLParser();
        parser.reset();


        Configuration configuration = (Configuration) parser.parse(
                specificationURL, specificationURL);


        // If the toplevel model is a configuration containing a directory,
        // then create an effigy for the configuration itself, and put it
        // in the directory.

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    }


    public Object clone() throws CloneNotSupportedException {
        ModelGenerator actor = (ModelGenerator) super.clone();
        actor._emptyModel = null;
        actor._parser = new MoMLParser();
        return actor;
    }

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                // This should not occur.
                System.err.println("Malformed preferences URL: " + ex);
                return;
            }


            MoMLParser parser = new MoMLParser(preferences.workspace());
            parser.setContext(preferences.getContainer());


            // Set the ErrorHandler so that if we have
            // compatibility problems between devel and production
            // versions, we can skip that element.
            // MoMLParser.setErrorHandler(new VergilErrorHandler());


            try {
                parser.parse(fileURL, fileURL);
            } catch (Exception ex) {
                System.out.println("Failed to read user preferences file: "
                        + ex);
            }
        }

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     *  @exception Exception If the rule file or the model file cannot be read.
     *  @see #match(String, String)
     */
    public static GraphMatcher match(String ruleXMLFile, String hostXMLFile,
            MatchCallback callback) throws Exception {
        MoMLParser parser = new MoMLParser();
        TransformationRule rule = (TransformationRule) parser.parse(null,
                new File(ruleXMLFile).toURI().toURL());
        parser.reset();
        CompositeEntity host = (CompositeEntity) parser.parse(null, new File(
                hostXMLFile).toURI().toURL());


        GraphMatcher matcher = new GraphMatcher();
        if (callback != null) {
            matcher.setMatchCallback(callback);

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                        .getAttribute("_parser", ParserAttribute.class);


                if (parserAttribute == null) {
                    parserAttribute = new ParserAttribute(newModel, "_parser");


                    MoMLParser parser = new MoMLParser();


                    // Make sure that the MoMLParser._modified flag is reset
                    // If we don't call reset here, then the second time
                    // the code generator is run, we will be prompted to
                    // save the model because the first time we ran
                    // the code generator the model was marked as modified.
                    parser.reset();


                    parserAttribute.setParser(parser);
                }


                // The name might be "blank" which is confusing.
                // Set it to an empty string.  On Save As, this will
                // be changed to match the file name.
                newModel.setName("");
                effigy.setModel(newModel);


                // THALES MODIF
                new Attribute(newModel, "_navigable");


                if (!modelIsValid(newModel)) {
                    effigy.setContainer(null);
                    effigy = null;
                }


                //END THALES MODIF
                return effigy;
            } else {
                String extension = getExtension(input);


                if (!extension.equals("xml") && !extension.equals("moml")) {
                    return null;
                }


                // THALES MODIF
                if (checkFile(input)) {
                    // Create a blank effigy.
                    PtolemyEffigy effigy = _newEffigy(container, container
                            .uniqueName("effigy"));


                    MoMLParser parser = new MoMLParser();


                    // Make sure that the MoMLParser._modified flag is reset
                    // If we don't call reset here, then the second time
                    // the code generator is run, we will be prompted to
                    // save the model because the first time we ran
                    // the code generator the model was marked as modified.
                    parser.reset();


                    NamedObj toplevel = null;


                    try {
                        try {
                            // If the following fails, we should remove the effigy.
                            try {
                                toplevel = parser.parse(base, input);
                            } catch (IOException io) {
                                // If we are running under Web Start, we
                                // might have a URL that refers to another
                                // jar file.
                                URL anotherURL = ClassUtilities
                                        .jarURLEntryResource(input.toString());


                                if (anotherURL != null) {
                                    toplevel = parser.parse(base, anotherURL);
                                } else {
                                    throw io;
                                }
                            }

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            //                 System.out.println("CheckModelSize: skipping " + fileName);
            //                 continue;
            //             }
            StringBuffer analysis = new StringBuffer();


            MoMLParser parser = new MoMLParser();
            MoMLParser.setMoMLFilters(BackwardCompatibility.allFilters());


            RemoveGraphicalClasses removeGraphicalClasses = new RemoveGraphicalClasses();


            // Remove StaticSchedulingCodeGenerator from Butterfly because during the
            // nightly build the codegenerator is not yet built when the tests in actor.gui
            // are run.
            removeGraphicalClasses.put(
                    "ptolemy.codegen.kernel.StaticSchedulingCodeGenerator",
                    null);


            // Filter out any graphical classes.
            MoMLParser.addMoMLFilter(removeGraphicalClasses);


            if (!(fileName.endsWith(".xml") || fileName.endsWith(".moml"))) {
                continue;
            }


            try {
                NamedObj top = null;
                try {
                    top = parser
                            .parse(null, new File(fileName).toURI().toURL());
                } catch (Exception ex) {
                    try {
                        top = parser.parse(null, new URL(fileName));
                    } catch (Exception ex2) {
                        throw new Exception("Failed to parse \"" + fileName
                                + "\". First exception:\n" + ex, ex2);
                    }
                }

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        URL xmlFile = getClass().getClassLoader().getResource(fileName);
        if (xmlFile == null) {
            return false;
        }
        InputStream input = xmlFile.openStream();
        MoMLParser newParser = new MoMLParser();
        newParser.setContext(context);
        newParser.parse(null, input);
        return true;
    }

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     *  that does not exist.
     *  @param args Ignored.
     *  @exception Exception if there is a problem parsing
     */
    public static void main(String[] args) throws Exception {
        parser = new MoMLParser();
        //CompositeEntity toptop = new CompositeEntity();
        //parser.setContext(toptop);
        try {
            CompositeEntity toplevel = leak();
            toplevel.setContainer(null);

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                                + ".GiottoCodeGeneratorUtilities ptolemyModel.xml\n"
                                + "The model is read in and Giotto code is "
                                + "generated on stdout.");
            }


            MoMLParser parser = new MoMLParser();


            // We set the list of MoMLFilters to handle Backward Compatibility.
            MoMLParser.setMoMLFilters(BackwardCompatibility.allFilters());


            // Filter out any graphical classes.
            MoMLParser.addMoMLFilter(new RemoveGraphicalClasses());


            // If there is a MoML error, then throw the exception as opposed
            // to skipping the error.  If we call StreamErrorHandler instead,
            // then the nightly build may fail to report MoML parse errors
            // as failed tests
            //parser.setErrorHandler(new StreamErrorHandler());
            // We use parse(URL, URL) here instead of parseFile(String)
            // because parseFile() works best on relative pathnames and
            // has problems finding resources like files specified in
            // parameters if the xml file was specified as an absolute path.
            TypedCompositeActor toplevel = (TypedCompositeActor) parser.parse(
                    null, new File(args[0]).toURI().toURL());


            System.out.println(generateGiottoCode(toplevel));
        } catch (Throwable ex) {
            System.err.println("Command failed: " + ex);

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            for (Iterator<File> iterator = actorFiles.iterator(); iterator.hasNext();) {
                File xmlFile = (File) iterator.next();


                MoMLParser parser = new MoMLParser();
                MoMLParser.purgeModelRecord(xmlFile.toURL());
                NamedObj namedObject = null;
                try {
                    namedObject = (NamedObj) parser.parse(null, xmlFile.toURL());
                } catch (Exception e) {
                    // Bug 18567
                    LoggerFactory.getLogger(this.getClass()).error("Error while loading Actor in file " + xmlFile.toURL(), e);
                }
                if (namedObject != null) {

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