private Statement defaultValueStatement(MetaClass type) {
if (type.isPrimitive()) {
if (type.asBoxed().isAssignableTo(Number.class)) {
return Stmt.castTo(type, Stmt.load(0));
} else if (type.isAssignableTo(boolean.class)) {
return Stmt.load(false);
} else {
throw new UnsupportedOperationException(
"Don't know how to make a default value for @PageState field of type "
+ type.getFullyQualifiedName());
}
} else {
return Stmt.load(null);
}
}
private static Statement paramFromStringStatement(MetaClass toType, Statement stringValue) {
// make sure it's really a string
stringValue = Stmt.castTo(String.class, stringValue);
if (toType.isAssignableTo(String.class)) {
return stringValue;
} else if (toType.asBoxed().isAssignableTo(Number.class)) {
return Stmt.invokeStatic(toType.asBoxed(), "valueOf", stringValue);
} else if (toType.asBoxed().isAssignableTo(Boolean.class)) {
return Stmt.invokeStatic(Boolean.class, "valueOf", stringValue);
} else {
throw new UnsupportedOperationException(
"@PageState fields of type " + toType.getFullyQualifiedName() + " are not supported");
}
}
private void appendPageShowMethod(
AnonymousClassStructureBuilder pageImplBuilder,
MetaClass pageClass,
Class<? extends Annotation> annotation,
boolean addPrivateAccessors) {
BlockBuilder<?> method =
pageImplBuilder
.publicMethod(
void.class,
createMethodNameFromAnnotation(annotation),
Parameter.of(pageClass, "widget"),
Parameter.of(HistoryToken.class, "state"))
.body();
int idx = 0;
method.append(Stmt.declareFinalVariable("pageState", Map.class, new HashMap<String, Object>()));
for (MetaField field : pageClass.getFieldsAnnotatedWith(PageState.class)) {
PageState psAnno = field.getAnnotation(PageState.class);
String fieldName = field.getName();
String queryParamName = psAnno.value();
if (queryParamName == null || queryParamName.trim().isEmpty()) {
queryParamName = fieldName;
}
if (addPrivateAccessors) {
PrivateAccessUtil.addPrivateAccessStubs(
PrivateAccessType.Write, "jsni", pageImplBuilder, field, new Modifier[] {});
}
String injectorName = PrivateAccessUtil.getPrivateFieldInjectorName(field);
MetaClass erasedFieldType = field.getType().getErased();
if (erasedFieldType.isAssignableTo(Collection.class)) {
MetaClass elementType =
MarshallingGenUtil.getConcreteCollectionElementType(field.getType());
if (elementType == null) {
throw new UnsupportedOperationException(
"Found a @PageState field with a Collection type but without a concrete type parameter. "
+ "Collection-typed @PageState fields must specify a concrete type parameter.");
}
if (erasedFieldType.equals(MetaClassFactory.get(Set.class))) {
method.append(Stmt.declareVariable(fieldName, Stmt.newObject(HashSet.class)));
} else if (erasedFieldType.equals(MetaClassFactory.get(List.class))
|| erasedFieldType.equals(MetaClassFactory.get(Collection.class))) {
method.append(Stmt.declareVariable(fieldName, Stmt.newObject(ArrayList.class)));
} else {
throw new UnsupportedOperationException(
"Found a @PageState field which is a collection of type "
+ erasedFieldType.getFullyQualifiedName()
+ ". For collection-valued fields, only the exact types java.util.Collection, java.util.Set, and "
+ "java.util.List are supported at this time.");
}
// for (String fv{idx} : state.get({fieldName}))
method.append(
Stmt.loadVariable("state")
.invoke("getState")
.invoke("get", queryParamName)
.foreach("elem", Object.class)
.append(
Stmt.declareVariable(
"fv" + idx, Stmt.castTo(String.class, Stmt.loadVariable("elem"))))
.append(
Stmt.loadVariable(fieldName)
.invoke(
"add",
paramFromStringStatement(elementType, Stmt.loadVariable("fv" + idx))))
.append(
Stmt.loadVariable("pageState")
.invoke("put", fieldName, Stmt.loadVariable(fieldName)))
.finish());
method.append(
Stmt.loadVariable("this")
.invoke(injectorName, Stmt.loadVariable("widget"), Stmt.loadVariable(fieldName)));
} else {
method.append(
Stmt.declareFinalVariable(
"fv" + idx,
Collection.class,
Stmt.loadVariable("state").invoke("getState").invoke("get", queryParamName)));
method.append(
If.cond(
Bool.or(
Bool.isNull(Stmt.loadVariable("fv" + idx)),
Stmt.loadVariable("fv" + idx).invoke("isEmpty")))
.append(
Stmt.loadVariable("this")
.invoke(
injectorName,
Stmt.loadVariable("widget"),
defaultValueStatement(erasedFieldType)))
.finish()
.else_()
.append(
Stmt.loadVariable("this")
.invoke(
injectorName,
Stmt.loadVariable("widget"),
paramFromStringStatement(
erasedFieldType,
Stmt.loadVariable("fv" + idx).invoke("iterator").invoke("next"))))
.append(
Stmt.loadVariable("pageState")
.invoke(
"put",
fieldName,
Stmt.loadVariable("fv" + idx).invoke("iterator").invoke("next")))
.finish());
}
idx++;
}
if (addPrivateAccessors) {
method.append(
Stmt.invokeStatic(
CDI.class,
"fireEvent",
Stmt.newObject(NavigationEvent.class)
.withParameters(
Stmt.newObject(PageRequest.class)
.withParameters(
getPageName(pageClass), Stmt.loadVariable("pageState")))));
}
checkMethodAndAddPrivateAccessors(
pageImplBuilder, method, pageClass, annotation, HistoryToken.class, "state");
method.finish();
}
@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();
}
