public void execute()

in src/main/java/org/apache/xmlbeans/impl/tool/MavenPlugin.java [198:330]
117 lines of code
28 McCabe index (conditional complexity)

    public void execute() throws MojoExecutionException, MojoFailureException {
        if (sourceDir == null || sourceDir.isEmpty() || !new File(sourceDir).isDirectory()) {
            throw new MojoFailureException("Set configuration <sourceDir> (='"+sourceDir+"') to a valid directory containing *.xsd,*.wsdl files.");
        }

        if (baseSchemaLocation == null || baseSchemaLocation.isEmpty()) {
            throw new MojoFailureException("baseSchemaLocation is empty");
        }

        if (sourceSchemas == null) {
            getLog().debug("sourceSchemas is null");
        }

        if (classPath == null) {
            getLog().debug("classPath is null");
        }

        final List<File> xsds = new ArrayList<>();
        final List<File> wsdls = new ArrayList<>();
        final List<File> javas = new ArrayList<>();
        File base = new File(sourceDir);
        Resource resource = new Resource();
        resource.setDirectory(sourceDir);
        resource.setTargetPath(baseSchemaLocation);

        // if sourceSchemas is not specified use all found schemas
        // otherwise convert comma-separated string to regex including glob parameter
        Pattern pat = Pattern.compile(sourceSchemas == null ? ".*" :
                "(" + sourceSchemas
                        .replace(",","|")
                        .replace(".", "\\.")
                        .replace("*",".*") +
                        ")");
        final Collection<File> schemaFiles = FileUtil.find(base, pat, recurseSourceSubdirs);
        for (File sf : schemaFiles) {
            String name = sf.getName();
            switch (name.replaceAll(".*\\.", "")) {
                case "wsdl":
                    wsdls.add(sf);
                    break;
                case "java":
                    javas.add(sf);
                    break;
                default:
                    xsds.add(sf);
                    break;
            }
            resource.addInclude(name);
        }

        resources = Collections.singletonList(resource);

        if (buildSchemas) {
            List<File> configs = (xmlConfigs == null || xmlConfigs.isEmpty()) ? Collections.emptyList()
                    : Stream.of(xmlConfigs.split(",")).flatMap(s ->
                    Stream.of(new File(s), new File(base, s)).filter(File::exists)
            ).collect(Collectors.toList());

            List<File> classPathList = new ArrayList<>();
            List<URL> urls = new ArrayList<>();
            if (classPath != null) {
                for (String classpathElement : classPath.split(",")) {
                    File file = new File(classpathElement);
                    classPathList.add(file);
                    try {
                        urls.add(file.toURI().toURL());
                    } catch (MalformedURLException e) {
                        throw new MojoFailureException("invalid classpath: "+file, e);
                    }
                }
            }
            ClassLoader cl = new URLClassLoader(urls.toArray(new URL[0]));
            EntityResolver entityResolver = MavenPluginResolver.getResolver(catalogLocation);
            URI sourceDirURI = new File(sourceDir).toURI();
            entityResolver = new PassThroughResolver(cl, entityResolver, sourceDirURI, baseSchemaLocation);

            Parameters params = new Parameters();
            params.setXsdFiles(files(xsds));
            params.setWsdlFiles(files(wsdls));
            params.setJavaFiles(files(javas));
            params.setConfigFiles(files(configs));
            params.setClasspath(files(classPathList));
            params.setName(name);
            params.setSrcDir(new File(javaTargetDir));
            params.setClassesDir(new File(classTargetDir));
            params.setNojavac(sourceOnly);
            params.setVerbose(verbose);
            params.setEntityResolver(entityResolver);
            params.setQuiet(quiet && quite); //setting either quiet or quite to false will disable quiet mode
            params.setNoUpa(noUpa);
            params.setNoPvr(noPvr);
            params.setNoAnn(noAnn);
            params.setCopyAnn(copyAnn);
            params.setNoVDoc(noVDoc);
            if (repackage != null && !repackage.isEmpty()) {
                params.setRepackage("org.apache.xmlbeans.metadata:"+repackage);
            }
            if (mdefNamespaces != null && !mdefNamespaces.isEmpty()) {
                params.setMdefNamespaces(new HashSet<>(mdefNamespaces));
            }
            List<XmlError> errorList = new ArrayList<>();
            params.setErrorListener(errorList);

            if (partialMethods != null && !partialMethods.isEmpty()) {
                params.setPartialMethods(parsePartialMethods(partialMethods));
            }
            params.setDownload(download);
            params.setBaseDir(basedir);
            params.setCompiler(compiler);
            params.setMemoryInitialSize(memoryInitialSize);
            params.setMemoryMaximumSize(memoryMaximumSize);
            params.setOutputJar(outputJar);
            params.setDebug(debug);
            params.setExtensions(extensions);
            if (sourceCodeEncoding != null && !sourceCodeEncoding.isEmpty()) {
                params.setSourceCodeEncoding(sourceCodeEncoding);
            }

            boolean result = SchemaCompiler.compile(params);

            if (!result) {
                throw new MojoFailureException("Schema compilation failed!\n"+
                        errorList.stream().map(XmlError::toString).collect(Collectors.joining("\n"))
                );
            }

            Resource genResource = new Resource();
            genResource.setDirectory(classTargetDir);
            project.addResource(genResource);
            project.addCompileSourceRoot(javaTargetDir);
        }

    }