/**
* Renders the page-to-page navigation graph into the file {@code navgraph.gv} in the {@code
* .errai} cache directory.
*/
private void renderNavigationToDotFile(BiMap<String, MetaClass> pages) {
final File dotFile = new File(RebindUtils.getErraiCacheDir().getAbsolutePath(), "navgraph.gv");
PrintWriter out = null;
try {
out = new PrintWriter(dotFile);
out.println("digraph Navigation {");
final MetaClass transitionToType = MetaClassFactory.get(TransitionTo.class);
final MetaClass transitionAnchorType = MetaClassFactory.get(TransitionAnchor.class);
final MetaClass transitionAnchorFactoryType =
MetaClassFactory.get(TransitionAnchorFactory.class);
for (Map.Entry<String, MetaClass> entry : pages.entrySet()) {
String pageName = entry.getKey();
MetaClass pageClass = entry.getValue();
// entry for the node itself
out.print("\"" + pageName + "\"");
Page pageAnnotation = pageClass.getAnnotation(Page.class);
List<Class<? extends PageRole>> roles = Arrays.asList(pageAnnotation.role());
if (roles.contains(DefaultPage.class)) {
out.print(" [penwidth=3]");
}
out.println();
for (MetaField field : getAllFields(pageClass)) {
if (field.getType().getErased().equals(transitionToType)
|| field.getType().getErased().equals(transitionAnchorType)
|| field.getType().getErased().equals(transitionAnchorFactoryType)) {
MetaType targetPageType = field.getType().getParameterizedType().getTypeParameters()[0];
String targetPageName = pages.inverse().get(targetPageType);
// entry for the link between nodes
out.println(
"\""
+ pageName
+ "\" -> \""
+ targetPageName
+ "\" [label=\""
+ field.getName()
+ "\"]");
}
}
}
out.println("}");
} catch (FileNotFoundException e) {
throw new RuntimeException(e);
} finally {
if (out != null) {
out.close();
}
}
}
@Override
protected String generate(TreeLogger logger, GeneratorContext context) {
final ClassStructureBuilder<?> classBuilder =
Implementations.extend(NavigationGraph.class, GENERATED_CLASS_NAME);
// accumulation of (name, pageclass) mappings for dupe detection and dot file generation
BiMap<String, MetaClass> pageNames = HashBiMap.create();
// accumulation UniquePageRoles for ensuring there is exactly one.
Multimap<Class<?>, MetaClass> pageRoles = ArrayListMultimap.create();
ConstructorBlockBuilder<?> ctor = classBuilder.publicConstructor();
final Collection<MetaClass> pages = ClassScanner.getTypesAnnotatedWith(Page.class, context);
for (MetaClass pageClass : pages) {
if (!pageClass.isAssignableTo(IsWidget.class)) {
throw new GenerationException(
"Class "
+ pageClass.getFullyQualifiedName()
+ " is annotated with @Page, so it must implement IsWidget");
}
Page annotation = pageClass.getAnnotation(Page.class);
String pageName = getPageName(pageClass);
List<Class<? extends PageRole>> annotatedPageRoles = Arrays.asList(annotation.role());
MetaClass prevPageWithThisName = pageNames.put(pageName, pageClass);
if (prevPageWithThisName != null) {
throw new GenerationException(
"Page names must be unique, but "
+ prevPageWithThisName
+ " and "
+ pageClass
+ " are both named ["
+ pageName
+ "]");
}
Statement pageImplStmt = generateNewInstanceOfPageImpl(pageClass, pageName);
if (annotatedPageRoles.contains(DefaultPage.class)) {
// need to assign the page impl to a variable and add it to the map twice
ctor.append(Stmt.declareFinalVariable("defaultPage", PageNode.class, pageImplStmt));
pageImplStmt = Variable.get("defaultPage");
ctor.append(Stmt.nestedCall(Refs.get("pagesByName")).invoke("put", "", pageImplStmt));
ctor.append(
Stmt.nestedCall(Refs.get("pagesByRole"))
.invoke("put", DefaultPage.class, pageImplStmt));
} else if (pageName.equals("")) {
throw new GenerationException(
"Page "
+ pageClass.getFullyQualifiedName()
+ " has an empty path. Only the"
+ " page with startingPage=true is permitted to have an empty path.");
}
final String fieldName = StringUtils.uncapitalize(pageClass.getName());
ctor.append(Stmt.declareFinalVariable(fieldName, PageNode.class, pageImplStmt));
ctor.append(
Stmt.nestedCall(Refs.get("pagesByName")).invoke("put", pageName, Refs.get(fieldName)));
for (Class<? extends PageRole> annotatedPageRole : annotatedPageRoles) {
pageRoles.put(annotatedPageRole, pageClass);
// DefaultPage is already added above.
if (!annotatedPageRole.equals(DefaultPage.class))
ctor.append(
Stmt.nestedCall(Refs.get("pagesByRole"))
.invoke("put", annotatedPageRole, Refs.get(fieldName)));
}
}
ctor.finish();
renderNavigationToDotFile(pageNames);
validateDefaultPagePresent(pages, pageRoles);
validateUnique(pageRoles);
return classBuilder.toJavaString();
}