/**
* Generates a new instance of an anonymous inner class that implements the PageNode interface.
*
* @param pageClass The class providing the widget content for the page.
* @param pageName The name of the page (to be used in the URL history fragment).
*/
private ObjectBuilder generateNewInstanceOfPageImpl(MetaClass pageClass, String pageName) {
AnonymousClassStructureBuilder pageImplBuilder =
ObjectBuilder.newInstanceOf(
MetaClassFactory.parameterizedAs(
PageNode.class, MetaClassFactory.typeParametersOf(pageClass)))
.extend();
pageImplBuilder
.publicMethod(String.class, "name")
.append(Stmt.loadLiteral(pageName).returnValue())
.finish()
.publicMethod(Class.class, "contentType")
.append(Stmt.loadLiteral(pageClass).returnValue())
.finish()
.publicMethod(
void.class, "produceContent", Parameter.of(CreationalCallback.class, "callback"))
.append(
Stmt.nestedCall(Refs.get("bm"))
.invoke("lookupBean", Stmt.loadLiteral(pageClass))
.invoke("getInstance", Stmt.loadVariable("callback")))
.finish();
appendPageHidingMethod(pageImplBuilder, pageClass);
appendPageHiddenMethod(pageImplBuilder, pageClass);
appendPageShowingMethod(pageImplBuilder, pageClass);
appendPageShownMethod(pageImplBuilder, pageClass);
return pageImplBuilder.finish();
}
/**
* Appends the method that calls the {@code @PageHiding} method of the widget.
*
* @param pageImplBuilder The class builder for the implementation of PageNode we are adding the
* method to.
* @param pageClass The "content type" (Widget subclass) of the page. This is the type the user
* annotated with {@code @Page}.
*/
private void appendPageHidingMethod(
AnonymousClassStructureBuilder pageImplBuilder, MetaClass pageClass) {
BlockBuilder<?> method =
pageImplBuilder
.publicMethod(
void.class,
createMethodNameFromAnnotation(PageHiding.class),
Parameter.of(pageClass, "widget"),
Parameter.of(NavigationControl.class, "control"))
.body();
final MetaMethod pageHidingMethod =
checkMethodAndAddPrivateAccessors(
pageImplBuilder,
method,
pageClass,
PageHiding.class,
NavigationControl.class,
"control");
/*
* If the user did not provide a control parameter, we must proceed for them after the method is invoked.
*/
if (pageHidingMethod == null || pageHidingMethod.getParameters().length != 1) {
method.append(Stmt.loadVariable("control").invoke("proceed"));
}
method.finish();
}
/**
* Appends the method that calls the {@code @PageHidden} method of the widget.
*
* @param pageImplBuilder The class builder for the implementation of PageNode we are adding the
* method to.
* @param pageClass The "content type" (Widget subclass) of the page. This is the type the user
* annotated with {@code @Page}.
*/
private void appendPageHiddenMethod(
AnonymousClassStructureBuilder pageImplBuilder, MetaClass pageClass) {
BlockBuilder<?> method =
pageImplBuilder
.publicMethod(
void.class,
createMethodNameFromAnnotation(PageHidden.class),
Parameter.of(pageClass, "widget"))
.body();
checkMethodAndAddPrivateAccessors(
pageImplBuilder, method, pageClass, PageHidden.class, HistoryToken.class, "state");
if (pageClass.getAnnotation(Singleton.class) == null
&& pageClass.getAnnotation(ApplicationScoped.class) == null
&& pageClass.getAnnotation(EntryPoint.class) == null) {
method.append(Stmt.loadVariable("bm").invoke("destroyBean", Stmt.loadVariable("widget")));
}
method.finish();
}
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();
}