@SuppressWarnings({"unchecked", "ConstantConditions"})
private void manageType(TypeElement enclosingElement, Logger logger) {
// Make sure we don't process twice the same type
String simpleName = enclosingElement.getSimpleName().toString();
String qualifiedName = enclosingElement.getQualifiedName().toString();
String packageName = Utils.getElementPackageName(enclosingElement);
if (managedTypes.contains(qualifiedName)) return;
managedTypes.add(qualifiedName);
// Prepare the output file
try {
JavaFileObject classFile =
processingEnv.getFiler().createSourceFile(qualifiedName + INJECTOR_SUFFIX);
logger.note("Writing " + classFile.toUri().getRawPath());
Writer out = classFile.openWriter();
JavaWriter writer = new JavaWriter(out);
writer.emitPackage(packageName);
// Initial imports
writer
.emitImports(AsyncService.class, Injector.class, Message.class, Set.class, HashSet.class)
.emitImports(
"com.joanzapata.android.asyncservice.api.annotation.OnMessage.Priority",
"android.os.Handler",
"android.os.Looper")
.emitStaticImports(
"com.joanzapata.android.asyncservice.api.annotation.OnMessage.Priority.*");
// Generates "public final class XXXInjector extends Injector<XXX>"
writer
.emitEmptyLine()
.beginType(
simpleName + INJECTOR_SUFFIX,
"class",
of(PUBLIC, FINAL),
"Injector<" + simpleName + ">");
// Generate a handler to execute runnables on the UI Thread
writer
.emitEmptyLine()
.emitField(
"Handler", "__handler", of(PRIVATE, FINAL), "new Handler(Looper.getMainLooper())");
// Keep trace of when a method has received data which is not from cache
writer
.emitEmptyLine()
.emitField(
"Set<String>",
"__receivedFinalResponses",
of(PRIVATE, FINAL),
"new HashSet<String>()");
// Generates "protected void inject(XXX target) { ..."
writer
.emitEmptyLine()
.emitAnnotation(Override.class)
.beginMethod("void", "inject", of(PROTECTED), simpleName, "target");
// Here, inject all services
List<Element> elementsAnnotatedWith =
findElementsAnnotatedWith(enclosingElement, InjectService.class);
for (Element element : elementsAnnotatedWith) {
if (isPublicOrPackagePrivate(element)) {
writer.emitStatement(
"target.%s = new %s(target)",
element.getSimpleName(),
element.asType().toString() + AsyncServiceAP.GENERATED_CLASS_SUFFIX);
}
}
// End of inject()
writer.endMethod().emitEmptyLine();
// Generates "protected void dispatch(XXX target, Message event)"
writer
.emitAnnotation(Override.class)
.beginMethod(
"void",
"dispatch",
of(PROTECTED),
"final " + simpleName,
"target",
"final " + Message.class.getSimpleName(),
"event",
Priority.class.getSimpleName(),
"priority");
// Once the user has received a "remote" result, make sure no cache is sent anymore
writer
.emitField(
"boolean",
"__hasBeenReceivedAlready",
of(FINAL),
"event.getQuery() != null && __receivedFinalResponses.contains(event.getQuery())")
.emitStatement("if (event.isCached() && __hasBeenReceivedAlready) return")
.emitStatement(
"if (!__hasBeenReceivedAlready && !event.isCached() && priority == LAST) __receivedFinalResponses.add(event.getQuery())");
// Here, dispatch events to methods
List<Element> responseReceivers =
findElementsAnnotatedWith(enclosingElement, OnMessage.class);
for (Element responseReceiver : responseReceivers) {
ExecutableElement annotatedMethod = (ExecutableElement) responseReceiver;
AnnotationMirror annotationMirror = getAnnotation(annotatedMethod, OnMessage.class);
List<? extends VariableElement> parameters = annotatedMethod.getParameters();
if (parameters.size() > 1)
logger.error(
responseReceiver, "@OnMessage annotated methods can't have more than 1 argument");
// Define event type given parameter or @InjectResponse value
List<String> eventTypes;
boolean hasArg = parameters.size() == 1;
if (hasArg) {
TypeMirror typeMirror = parameters.get(0).asType();
eventTypes = asList(typeMirror.toString());
if (hasTypeParameters(processingEnv, typeMirror))
logger.error(
parameters.get(0),
"You can't receive typed parameters in @OnMessage annotated methods");
} else {
List<AnnotationValue> parameterTypeClasses =
getAnnotationValue(annotationMirror, "value");
// Validate each parameter type given in the annotation
eventTypes = new ArrayList<String>();
for (AnnotationValue value : parameterTypeClasses) {
DeclaredType parameterTypeClass = (DeclaredType) value.getValue();
if (parameterTypeClass == null)
logger.error(
annotatedMethod, "Either declare an argument or give @OnMessage a value.");
if (hasTypeParameters(processingEnv, parameterTypeClass))
logger.error(
annotatedMethod,
annotationMirror,
"value",
"You can't receive typed parameters in @OnMessage method");
eventTypes.add(parameterTypeClass.toString());
}
}
// Define whether we should check emitter or not dependeing on the annotation value
VariableElement from = getAnnotationValue(annotationMirror, "from");
boolean checkEmitter = !ALL.toString().equals("" + from);
// Check the priority of the method
VariableElement priorityValue = getAnnotationValue(annotationMirror, "priority");
Priority priority = !LAST.toString().equals("" + priorityValue) ? FIRST : LAST;
writer.beginControlFlow("if (priority == %s)", priority);
// Write the code to call the user method
if (checkEmitter) writer.beginControlFlow("if (event.getEmitter() == getTarget())");
// Create a new inner class for the Runnable to run on UI thread
StringWriter buffer = new StringWriter();
JavaWriter inner = new JavaWriter(buffer);
inner
.emitPackage("")
.beginType("Runnable()", "new")
.emitAnnotation("Override")
.beginMethod("void", "run", of(PUBLIC));
if (hasArg)
inner.emitStatement(
"target.%s((%s) event.getPayload())",
annotatedMethod.getSimpleName(), eventTypes.get(0));
else inner.emitStatement("target.%s()", annotatedMethod.getSimpleName());
inner.endMethod().endType();
// For each type (can be multiple)
for (int i = 0; i < eventTypes.size(); i++) {
String eventType = eventTypes.get(i);
writer
.beginControlFlow(
"%sif (event.getPayload() instanceof %s)", i != 0 ? "else " : "", eventType)
.emitStatement("__handler.post(%s)", buffer.toString())
.endControlFlow();
}
if (checkEmitter) writer.endControlFlow();
writer.endControlFlow();
}
// End of inject();
writer.endMethod().emitEmptyLine();
// End of file
writer.endType();
out.flush();
out.close();
} catch (IOException e) {
throw new IllegalStateException("Error while create the injector for " + qualifiedName, e);
}
}