/**
* Initial processing pass. Collections events and sections with backings as it goes. Events are
* processed in the next pass.
*
* @param section
* @param parameterMap
*/
private void recurseProcessSectionBackings(
TemplatedSection section, Map<Object, Object> parameterMap) {
Map<Object, Object> vars = new HashMap<Object, Object>();
if (this.getTemplateVariables() != null) {
vars.putAll(this.getTemplateVariables());
}
if (section.getTemplateVariables() != null) {
vars.putAll(section.getTemplateVariables());
}
section.setTemplateVariables(vars);
if (section.getSectionBacking() != null) {
ProcessingContext context = new ProcessingContextImpl();
TemplatedSectionBacking backing = section.getSectionBacking();
// as we process sections, we accumulate the sections that have backings
// so that they may target each other in the events processing pass
// the map is Map<Section,List<TemplatedSection>>
List<String> targets = backing.getProcessingTargetIds();
if (targets != null)
for (String target : targets) {
if (sectionsWithBackings.get(target) == null)
sectionsWithBackings.put(target, new HashSet<TemplatedSection>());
sectionsWithBackings.get(target).add(section);
}
Collection<ProcessingEvent> events = backing.process(context, vars, parameterMap);
// put the events in their appropriate target location
if (events != null && events.size() > 0)
for (ProcessingEvent event : events) {
for (String targetName : event.getTargets()) {
if (processingEvents.get(targetName) == null)
processingEvents.put(targetName, new ArrayList<ProcessingEvent>());
processingEvents.get(targetName).add(event);
}
}
}
// recurse up the template tree toward the leaf levels
if (section.getChildren() != null)
for (Object thisSection : section.getChildren().values().toArray())
recurseProcessSectionBackings((TemplatedSection) thisSection, parameterMap);
}
public void handleProcessAndRender(Map<Object, Object> parameterMap, Writer writer) {
sectionsWithBackings = new HashMap<String, Set<TemplatedSection>>();
processingEvents = new HashMap<String, List<ProcessingEvent>>();
int lastHashCode = 0;
// pass one may generate events for other backings to process
recurseProcessSectionBackings(templateTree, parameterMap);
// iteratively process events till none are thrown...
while (processingEvents.size() > 0 && processingEvents.hashCode() != lastHashCode) {
Map<String, List<ProcessingEvent>> originalEvents = processingEvents;
lastHashCode = processingEvents.hashCode();
processingEvents = new HashMap<String, List<ProcessingEvent>>();
for (Map.Entry<String, List<ProcessingEvent>> entry : originalEvents.entrySet()) {
if (sectionsWithBackings.get(entry.getKey()) != null) {
Set<TemplatedSection> sections = sectionsWithBackings.get(entry.getKey());
for (TemplatedSection section : sections) {
Map<Object, Object> vars = new HashMap<Object, Object>();
if (this.getTemplateVariables() != null) {
vars.putAll(this.getTemplateVariables());
}
if (section.getTemplateVariables() != null) {
vars.putAll(section.getTemplateVariables());
}
section.setTemplateVariables(vars);
ProcessingContext context = new ProcessingContextImpl();
Collection<ProcessingEvent> newEvents =
section
.getSectionBacking()
.processEvents(context, entry.getValue(), vars, parameterMap);
// put the events in their appropriate target location
if (newEvents != null)
for (ProcessingEvent event : newEvents) {
for (String targetName : event.getTargets()) {
if (processingEvents.get(targetName) == null)
processingEvents.put(targetName, new ArrayList<ProcessingEvent>());
processingEvents.get(targetName).add(event);
}
}
}
}
}
}
try {
templateTree.render(writer);
} catch (TemplateException te) {
throw new RuntimeException(te);
} catch (IOException ioe) {
throw new RuntimeException(ioe);
}
}