Examples of org.json.JSONWriter

org.json.JSONWriter
JSONWriter provides a quick and convenient way of producing JSON text. The texts produced strictly conform to JSON syntax rules. No whitespace is added, so the results are ready for transmission or storage. Each instance of JSONWriter can produce one JSON text.
A JSONWriter instance provides a value method for appending values to the text, and a key method for adding keys before values in objects. There are array and endArray methods that make and bound array values, and object and endObject methods which make and bound object values. All of these methods return the JSONWriter instance, permitting a cascade style. For example,
```
 new JSONWriter(myWriter).object().key("JSON").value("Hello, World!") .endObject(); 
```
which writes
```
 {"JSON":"Hello, World!"} 
```
The first method called must be array or object. There are no methods for adding commas or colons. JSONWriter adds them for you. Objects and arrays can be nested up to 20 levels deep.
This can sometimes be easier than using a JSONObject to build a string. @author JSON.org @version 2011-11-24

        
        try {
            response.setCharacterEncoding("UTF-8");
            response.setHeader("Content-Type", "application/json");
            
            JSONWriter writer = new JSONWriter(response.getWriter());
            Properties options = new Properties();
            
            writer.object();
            
            writer.key("functions");
            writer.object();
            {
                for (Entry<String, Function> entry : ControlFunctionRegistry.getFunctionMapping()) {
                    writer.key(entry.getKey());
                    entry.getValue().write(writer, options);
                }
            }
            writer.endObject();
            
            writer.key("controls");
            writer.object();
            {
                for (Entry<String, Control> entry : ControlFunctionRegistry.getControlMapping()) {
                    writer.key(entry.getKey());
                    entry.getValue().write(writer, options);
                }
            }
            writer.endObject();
            
            writer.endObject();
        } catch (Exception e) {
            respondException(response, e);
        }
    }

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            if (historyEntry != null) {
                /*
                 * If the process is done, write back the cell's data so that the
                 * client side can update its UI right away.
                 */
                JSONWriter writer = new JSONWriter(response.getWriter());


                Pool pool = new Pool();
                Properties options = new Properties();
                options.put("pool", pool);


                writer.object();
                writer.key("code"); writer.value("ok");
                writer.key("historyEntry"); historyEntry.write(writer, options);
                writer.key("cell"); process.newCell.write(writer, options);
                writer.key("pool"); pool.write(writer, options);
                writer.endObject();
            } else {
                respond(response, "{ \"code\" : \"pending\" }");
            }
        } catch (Exception e) {
            respondException(response, e);

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            Map<String, DataExtension> map = job.extend(ids, reconCandidateMap);
            
            response.setCharacterEncoding("UTF-8");
            response.setHeader("Content-Type", "application/json");
            
            JSONWriter writer = new JSONWriter(response.getWriter());
            writer.object();
            writer.key("code"); writer.value("ok");
            writer.key("columns");
                writer.array();
                for (ColumnInfo info : job.columns) {
                    writer.object();
                    writer.key("names");
                        writer.array();
                        for (String name : info.names) {
                            writer.value(name);
                        }
                        writer.endArray();
                    writer.key("path");
                        writer.array();
                        for (String id : info.path) {
                            writer.value(id);
                        }
                        writer.endArray();
                    writer.endObject();
                }
                writer.endArray();
            
            writer.key("rows");
                writer.array();
                for (int r = 0; r < topicNames.size(); r++) {
                    String id = topicIds.get(r);
                    String topicName = topicNames.get(r);
                    
                    if (id != null && map.containsKey(id)) {
                        DataExtension ext = map.get(id);
                        boolean first = true;
                        
                        if (ext.data.length > 0) {
                            for (Object[] row : ext.data) {
                                writer.array();
                                if (first) {
                                    writer.value(topicName);
                                    first = false;
                                } else {
                                    writer.value(null);
                                }
                                
                                for (Object cell : row) {
                                    if (cell != null && cell instanceof ReconCandidate) {
                                        ReconCandidate rc = (ReconCandidate) cell;
                                        writer.object();
                                        writer.key("id"); writer.value(rc.id);
                                        writer.key("name"); writer.value(rc.name);
                                        writer.endObject();
                                    } else {
                                        writer.value(cell);
                                    }
                                }
                                
                                writer.endArray();
                            }
                            continue;
                        }
                    }
                    
                    writer.array();
                    if (id != null) {
                        writer.object();
                        writer.key("id"); writer.value(id);
                        writer.key("name"); writer.value(topicName);
                        writer.endObject();
                    } else {
                        writer.value("<not reconciled>");
                    }
                    writer.endArray();
                }
                writer.endArray();
                
            writer.endObject();
        } catch (Exception e) {
            respondException(response, e);
        }
    }

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        long jobID = Long.parseLong(request.getParameter("jobID"));
        ImportingJob job = ImportingManager.getJob(jobID);
        
        Writer w = response.getWriter();
        JSONWriter writer = new JSONWriter(w);
        try {
            writer.object();
            if (job == null) {
                writer.key("code"); writer.value("error");
                writer.key("message"); writer.value("No such import job");
            } else {
                writer.key("code"); writer.value("ok");
                writer.key("job"); job.write(writer, new Properties());
            }
            writer.endObject();
        } catch (JSONException e) {
            throw new ServletException(e);
        } finally {
            w.flush();
            w.close();

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    @Override
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {


        Writer w = response.getWriter();
        JSONWriter writer = new JSONWriter(w);
        try {
            writer.object();
            writer.key("config"); ImportingManager.writeConfiguration(writer, new Properties());
            writer.endObject();
        } catch (JSONException e) {
            throw new ServletException(e);
        } finally {
            w.flush();
            w.close();

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            return change;
        }
        
        static protected void writeProtograph(Protograph p, Writer writer) throws IOException {
            if (p != null) {
                JSONWriter jsonWriter = new JSONWriter(writer);
                try {
                    p.write(jsonWriter, new Properties());
                } catch (JSONException e) {
                    e.printStackTrace();
                }

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            writer.write(name); writer.write('\n');
        }
        writer.write("columnTypeCount="); writer.write(Integer.toString(_columnTypes.size())); writer.write('\n');
        for (FreebaseType type : _columnTypes) {
            try {
                JSONWriter jsonWriter = new JSONWriter(writer);
                
                type.write(jsonWriter, options);
            } catch (JSONException e) {
                // ???
            }
            writer.write('\n');
        }
        writer.write("rowIndexCount="); writer.write(Integer.toString(_rowIndices.size())); writer.write('\n');
        for (Integer rowIndex : _rowIndices) {
            writer.write(rowIndex.toString()); writer.write('\n');
        }
        writer.write("dataExtensionCount="); writer.write(Integer.toString(_dataExtensions.size())); writer.write('\n');
        for (DataExtension dataExtension : _dataExtensions) {
            if (dataExtension == null) {
                writer.write('\n');
                continue;
            }
            
            writer.write(Integer.toString(dataExtension.data.length)); writer.write('\n');
            
            for (Object[] values : dataExtension.data) {
                for (Object value : values) {
                    if (value == null) {
                        writer.write("null");
                    } else if (value instanceof ReconCandidate) {
                        try {
                            JSONWriter jsonWriter = new JSONWriter(writer);
                            ((ReconCandidate) value).write(jsonWriter, options);
                        } catch (JSONException e) {
                            // ???
                        }
                    } else if (value instanceof String) {

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        try {
            String query = null;
            {
                StringWriter stringWriter = new StringWriter();
                JSONWriter jsonWriter = new JSONWriter(stringWriter);
                
                jsonWriter.object();
                jsonWriter.key("query");
                jsonWriter.array();
                jsonWriter.object();


                jsonWriter.key("id"); jsonWriter.value(null);
                jsonWriter.key("name"); jsonWriter.value(null);
                jsonWriter.key("guid"); jsonWriter.value(null);
                jsonWriter.key("type"); jsonWriter.array(); jsonWriter.endArray();


                jsonWriter.key("guid|=");
                jsonWriter.array();
                for (ReconJob job : jobs) {
                    jsonWriter.value(((GuidBasedReconJob) job).guid);
                }
                jsonWriter.endArray();


                jsonWriter.endObject();
                jsonWriter.endArray();
                jsonWriter.endObject();


                query = stringWriter.toString();
            }
            
            StringBuffer sb = new StringBuffer(1024);

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    }


    protected void saveToFile(File file) throws IOException, JSONException {
        FileWriter writer = new FileWriter(file);
        try {
            JSONWriter jsonWriter = new JSONWriter(writer);
            jsonWriter.object();
            jsonWriter.key("projectIDs");
            jsonWriter.array();
            for (Long id : _projectsMetadata.keySet()) {
                ProjectMetadata metadata = _projectsMetadata.get(id);
                if (metadata != null) {
                    jsonWriter.value(id);


                    try {
                        ProjectMetadataUtilities.save(metadata, getProjectDir(id));
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            }
            jsonWriter.endArray();
            writer.write('\n');


            jsonWriter.key("preferences");
            _preferenceStore.write(jsonWriter, new Properties());


            jsonWriter.endObject();
        } finally {
            writer.close();
        }
    }

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            writer.write("overlayModel:");
            writer.write(modelName);
            writer.write("=");
            
            try {
                JSONWriter jsonWriter = new JSONWriter(writer);
                
                overlayModels.get(modelName).write(jsonWriter, options);
            } catch (JSONException e) {
                e.printStackTrace();
            }

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