public void sendJson()

in hollow-diff-ui/src/main/java/com/netflix/hollow/history/ui/pages/HistoryStateTypePage.java [61:160]
85 lines of code
14 McCabe index (conditional complexity)

    public void sendJson(HttpServletRequest request, HollowUISession session, HttpServletResponse response) {
    	long version = Long.parseLong(request.getParameter("version"));
    	HistoryStateTypeChanges typeChange = getStateTypeChanges(request, session, ui);
    	HollowHistoricalState historicalState = ui.getHistory().getHistoricalState(version);
    	
    	List<String> groupByOptions = new ArrayList<String>(Arrays.asList(historicalState.getKeyOrdinalMapping().getTypeMapping(request.getParameter("type")).getKeyIndex().getKeyFields()));
    	groupByOptions.removeAll(Arrays.asList(typeChange.getGroupedFieldNames()));
    	
    	Map<String, List<List<String>>> changes = new LinkedHashMap<String, List<List<String>>>();
    	
    	List<List<String>> groups = new ArrayList<List<String>>();
    	groups.add(groupByOptions);
    	changes.put("groups", groups);
    	
    	// handle additions
    	if(typeChange.getAddedRecords().isEmpty()) {
    		changes.put("additions", new ArrayList<List<String>>());
    	} else if(!typeChange.getAddedRecords().hasSubGroups()){
    		List<RecordDiff> addedDiffs = typeChange.getAddedRecords().getRecordDiffs();
    		List<List<String>> idRecords = new ArrayList<List<String>>();
    		for(RecordDiff diff : addedDiffs) {
    			List<String> data = new ArrayList<String>();
    			data.add(diff.getIdentifierString());
    			data.add(new Integer(diff.getKeyOrdinal()).toString());
    			idRecords.add(data);
    		}
    		changes.put("additions", idRecords);
    	} else {
    		// This has sub groups
    		List<List<String>> idRecords = new ArrayList<List<String>>();
    		for(RecordDiffTreeNode changeGroup : typeChange.getAddedRecords().getSubGroups()) {
    			List<String> data = new ArrayList<String>();
    			data.add(changeGroup.getGroupName() + "(" + changeGroup.getDiffCount() +  ")");
    			data.add(changeGroup.getHierarchicalFieldName());
    			idRecords.add(data);
    		}
    		changes.put("additions", idRecords);
    	}

    	// handle modifications
    	if(typeChange.getModifiedRecords().isEmpty()) {
    		changes.put("modifications", new ArrayList<List<String>>());
    	} else if(!typeChange.getModifiedRecords().hasSubGroups()){
    		List<RecordDiff> modifiedDiffs = typeChange.getModifiedRecords().getRecordDiffs();
    		List<List<String>> idRecords = new ArrayList<List<String>>();
    		for(RecordDiff diff : modifiedDiffs) {
    			List<String> data = new ArrayList<String>();
    			data.add(diff.getIdentifierString());
    			data.add(new Integer(diff.getKeyOrdinal()).toString());
    			idRecords.add(data);
    		}
    		changes.put("modifications", idRecords);
    	} else {
    		// This has sub groups
    		List<List<String>> idRecords = new ArrayList<List<String>>();
    		for(RecordDiffTreeNode changeGroup : typeChange.getModifiedRecords().getSubGroups()) {
    			List<String> data = new ArrayList<String>();
    			data.add(changeGroup.getGroupName() + "(" + changeGroup.getDiffCount() +  ")");
    			data.add(changeGroup.getHierarchicalFieldName());
    			idRecords.add(data);
    		}
    		changes.put("modifications", idRecords);    		
    	}
    	
    	// handle removals
    	if(typeChange.getRemovedRecords().isEmpty()) {
    		changes.put("removals", new ArrayList<List<String>>());
    	} else if(!typeChange.getRemovedRecords().hasSubGroups()){
    		List<RecordDiff> removedDiffs = typeChange.getRemovedRecords().getRecordDiffs();
    		List<List<String>> idRecords = new ArrayList<List<String>>();
    		for(RecordDiff diff : removedDiffs) {
    			List<String> data = new ArrayList<String>();
    			data.add(diff.getIdentifierString());
    			data.add(new Integer(diff.getKeyOrdinal()).toString());
    			idRecords.add(data);
    		}
    		changes.put("removals", idRecords);
    	} else {
    		// This has sub groups
    		List<List<String>> idRecords = new ArrayList<List<String>>();
    		for(RecordDiffTreeNode changeGroup : typeChange.getRemovedRecords().getSubGroups()) {
    			List<String> data = new ArrayList<String>();
    			data.add(changeGroup.getGroupName() + "(" + changeGroup.getDiffCount() +  ")");
    			data.add(changeGroup.getHierarchicalFieldName());
    			idRecords.add(data);
    		}
    		changes.put("removals", idRecords);    		
    	}
    	
    	
    	try {
        	PrintWriter out = response.getWriter();
        	Gson gson = new Gson();
        	String json = gson.toJson(changes, changes.getClass());
        	out.println(json);
    	} catch(IOException e) {
    		e.printStackTrace();
    	}
    	
    }