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

            HttpUtilities.respond(response, "error", "Not authorized");
            return;
        }
        
        Writer w = response.getWriter();
        JSONWriter writer = new JSONWriter(w);
        try {
            writer.object();
            writer.key("documents");
            writer.array();
            
            try {
                listSpreadsheets(GDataExtension.getDocsService(token), writer);
                listFusionTables(GDataExtension.getFusionTablesGoogleService(token), writer);
            } catch (ServiceException e) {
                e.printStackTrace();
            }
            
            writer.endArray();
            writer.endObject();
        } catch (JSONException e) {
            throw new ServletException(e);
        } finally {
            w.flush();
            w.close();

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                optionObj,
                exceptions
            );
            
            Writer w = response.getWriter();
            JSONWriter writer = new JSONWriter(w);
            try {
                writer.object();
                if (exceptions.size() == 0) {
                    job.project.update(); // update all internal models, indexes, caches, etc.
                    
                    writer.key("status"); writer.value("ok");
                } else {
                    writer.key("status"); writer.value("error");
                    
                    writer.key("errors");
                    writer.array();
                    DefaultImportingController.writeErrors(writer, exceptions);
                    writer.endArray();
                }
                writer.endObject();
            } catch (JSONException e) {
                throw new ServletException(e);
            } finally {
                w.flush();
                w.close();

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            response.setCharacterEncoding("UTF-8");
            response.setHeader("Content-Type", "application/json");
            
            Writer w = response.getWriter();
            JSONWriter writer = new JSONWriter(w);
            try {
                writer.object();
                
                List<Exception> exceptions = new LinkedList<Exception>();
                String url = upload(project, engine, params, token, name, exceptions);
                if (url != null) {
                    writer.key("status"); writer.value("ok");
                    writer.key("url"); writer.value(url);
                } else if (exceptions.size() == 0) {
                    writer.key("status"); writer.value("error");
                    writer.key("message"); writer.value("No such format");
                } else {
                    for (Exception e : exceptions) {
                        logger.warn(e.getLocalizedMessage(), e);
                    }
                    writer.key("status"); writer.value("error");
                    writer.key("message"); writer.value(exceptions.get(0).getLocalizedMessage());
                }
            } catch (Exception e) {
                e.printStackTrace();
                writer.key("status"); writer.value("error");
                writer.key("message"); writer.value(e.getMessage());
            } finally {
                writer.endObject();
                w.flush();
                w.close();
            }
        } catch (Exception e) {
            throw new ServletException(e);

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    }
    
    @Override
    public void flush() throws IOException {
        try {
            JSONWriter jsonWriter = new JSONWriter(writer);
            
            jsonWriter.array();
            for (JSONObject obj : rootObjects) {
                jsonWriter.value(obj);
            }
            jsonWriter.endArray();
            
        } catch (JSONException e) {
            e.printStackTrace();
        }
        writer.flush();

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    }


    private void renderResult(final PrintWriter pw, final Component component)
        throws IOException
    {
        final JSONWriter jw = new JSONWriter(pw);
        try
        {
            jw.object();


            final ScrService scrService = getScrService();
            if (scrService == null)
            {
                jw.key("status"); //$NON-NLS-1$
                jw.value(-1);
            }
            else
            {
                final Component[] components = scrService.getComponents();


                if (components == null || components.length == 0)
                {
                    jw.key("status"); //$NON-NLS-1$
                    jw.value(0);
                }
                else
                {
                    // order components by name
                    sortComponents(components);


                    final StringBuffer buffer = new StringBuffer();
                    buffer.append(components.length);
                    buffer.append(" component"); //$NON-NLS-1$
                    if (components.length != 1)
                    {
                        buffer.append('s');
                    }
                    buffer.append(" installed."); //$NON-NLS-1$
                    jw.key("status"); //$NON-NLS-1$
                    jw.value(components.length);


                    // render components
                    jw.key("data"); //$NON-NLS-1$
                    jw.array();
                    if (component != null)
                    {
                        component(jw, component, true);
                    }
                    else
                    {
                        for (int i = 0; i < components.length; i++)
                        {
                            component(jw, components[i], false);
                        }
                    }
                    jw.endArray();
                }
            }


            jw.endObject();
        }
        catch (JSONException je)
        {
            throw new IOException(je.toString());
        }

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  public static String getSampleJsonString(int numRows) {
    JSONStringer x = new JSONStringer();
    Random rand = new Random(0);
    try {
      JSONWriter top = x.array();
      for (int i = 1; i <= numRows; i++) {
        JSONWriter o = top.object();
        o.key("a").value("a" + i);


        o.key("b").value("b" + i);


        JSONWriter c = o.key("c").array();
        for (int ci = 1; ci <= 10; ci++) {
          JSONWriter co = c.object();
          co.key("c.1").value("c.1_" + ci);
          if (rand.nextBoolean()) {
            co.key("c.2").value("c.2_" + ci);
          }


          if (rand.nextBoolean()) {
            JSONWriter c3a = co.key("c.3").array();


            for (int c3i = 1; c3i < rand.nextInt(10) + 1; c3i++) {
              JSONWriter c3o = c3a.object();
              if (rand.nextBoolean()) {
                co.key("c.3.1").value(
                    "c.3.1_" + c3i + "+" + ci + "+" + i);
              }
              if (rand.nextBoolean()) {
                co.key("c.3.2").value("c.3.2_" + c3i);
              }
              if (rand.nextBoolean()) {
                co.key("c.3.3").value("c.3.3_" + c3i);
              }
              if (rand.nextBoolean()) {
                JSONWriter c34o = co.key("c.3.4").object();
                c34o.key("c.3.4.1").value("c.3.4.1_X");
                c34o.key("c.3.4.2").value("c.3.4.1_Y");
                c34o.endObject();
              }
              c3o.endObject();
            }


            c3a.endArray();
          }


          co.endObject();
        }
        c.endArray();


        // List of primitive values.
        JSONWriter d = o.key("d").array();
        for (int di = 1; di < rand.nextInt(10) + 1; di++) {
          d.value("d" + di);
        }
        d.endArray();


        JSONWriter e = o.key("e").array();
        for (int ei = 1; ei < rand.nextInt(10) + 1; ei++) {
          if (rand.nextBoolean()) {
            e.value("e" + ei + "+" + i);
          } else {
            e.object().key("e.1").value("e.1_" + ei).key("e.2")
                .value("e.2_" + ei).endObject();
          }
        }
        e.endArray();


        o.endObject();
      }
      top.endArray();
    } catch (JSONException e) {
      e.printStackTrace();
      return null;
    }


    return x.toString();
  }

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  public static String getJsonForUnitTest1() {
    JSONStringer x = new JSONStringer();
    Random rand = new Random(0);
    try {
      JSONWriter top = x.array();
      for (int i = 1; i <= 2; i++) {
        JSONWriter o = top.object();
        o.key("a").value("a" + i);


        o.key("b").value("b" + i);


        JSONWriter c = o.key("c").array();
        for (int ci = 1; ci <= 10; ci++) {
          JSONWriter co = c.object();
          co.key("c.1").value("c.1_" + ci);
          if (rand.nextBoolean()) {
            co.key("c.2").value("c.2_" + ci);
          }


          if (rand.nextBoolean()) {
            //
          }


          co.endObject();
        }
        c.endArray();


        // List of primitive values.
        JSONWriter d = o.key("d").array();
        for (int di = 1; di < rand.nextInt(10) + 1; di++) {
          d.value("d" + di);
        }
        d.endArray();


        JSONWriter e = o.key("e").array();
        for (int ei = 1; ei < rand.nextInt(10) + 1; ei++) {
          if (rand.nextBoolean()) {
            e.value("e" + ei + "+" + i);
          } else {
            e.object().key("e.1").value("e.1_" + ei).key("e.2")
                .value("e.2_" + ei).endObject();
          }
        }
        e.endArray();


        o.endObject();
      }
      top.endArray();
    } catch (JSONException e) {
      e.printStackTrace();
      return null;
    }


    return x.toString();
  }

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  public static String getJsonForUnitTest4() {
    JSONStringer x = new JSONStringer();
    Random rand = new Random(0);
    try {
      JSONWriter top = x.array();
      for (int i = 1; i <= 1; i++) {
        JSONWriter o = top.object();


        JSONWriter c = o.key("c").array();
        for (int ci = 1; ci <= 3; ci++) {
          JSONWriter co = c.object();
          if (rand.nextBoolean()) {
            co.key("c.2").value("c.2_" + ci);
          }


          if (rand.nextBoolean()) {
            JSONWriter c3a = co.key("c.3").array();


            for (int c3i = 1; c3i < 3; c3i++) {
              JSONWriter c3o = c3a.object();
              if (rand.nextBoolean()) {
                co.key("c.3.1").value(
                    "c.3.1_" + c3i + "+" + ci + "+" + i);
              }
              if (rand.nextBoolean()) {
                co.key("c.3.3").value("c.3.3_" + c3i);
              }
              if (rand.nextBoolean()) {
                JSONWriter c34o = co.key("c.3.4").object();
                c34o.key("c.3.4.2").value("c.3.4.1_Y");
                c34o.endObject();
              }
              c3o.endObject();
            }


            c3a.endArray();

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  public static String getJsonForUnitTest5() {
    JSONStringer x = new JSONStringer();
    Random rand = new Random(0);
    try {
      JSONWriter top = x.array();
      for (int i = 1; i <= 1; i++) {
        JSONWriter o = top.object();


        JSONWriter c = o.key("c").array();
        for (int ci = 1; ci <= 4; ci++) {
          JSONWriter co = c.object();
          co.key("c.1").value("c.1_" + ci);
          if (rand.nextBoolean()) {
            // Need the call to rand to make the test come out
            // right.
          }


          if (rand.nextBoolean()) {
            JSONWriter c3a = co.key("c.3").array();


            for (int c3i = 1; c3i < rand.nextInt(10) + 1; c3i++) {
              JSONWriter c3o = c3a.object();
              if (rand.nextBoolean()) {
                co.key("c.3.1").value(
                    "c.3.1_" + c3i + "+" + ci + "+" + i);
              }
              if (rand.nextBoolean()) {
                co.key("c.3.2").value("c.3.2_" + c3i);
              }
              if (rand.nextBoolean()) {
                co.key("c.3.3").value("c.3.3_" + c3i);
              }
              if (rand.nextBoolean()) {
                JSONWriter c34o = co.key("c.3.4").object();
                c34o.key("c.3.4.1").value("c.3.4.1_X");
                c34o.key("c.3.4.2").value("c.3.4.1_Y");
                c34o.endObject();
              }
              c3o.endObject();
            }


            c3a.endArray();
          }


          co.endObject();
        }
        c.endArray();


        JSONWriter e = o.key("e").array();
        for (int ei = 1; ei < 6; ei++) {
          if (rand.nextBoolean()) {
            e.value("e" + ei + "+" + i);
          } else {
            e.object().key("e.1").value("e.1_" + ei).endObject();
          }
        }
        e.endArray();


        o.endObject();
      }
      top.endArray();
    } catch (JSONException e) {
      e.printStackTrace();
      return null;
    }


    return x.toString();
  }

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  public static String getJsonForUnitTest6() {
    JSONStringer x = new JSONStringer();
    Random rand = new Random(0);
    try {
      JSONWriter top = x.array();
      for (int i = 1; i <= 1; i++) {
        JSONWriter o = top.object();


        JSONWriter c = o.key("c").array();
        for (int ci = 1; ci <= 1; ci++) {
          JSONWriter co = c.object();
          // co.key("c.1").value("c.1_" + ci);
          if (rand.nextBoolean()) {
            // Need the call to rand to make the test come out
            // right.
          }


          if (rand.nextBoolean()) {
            JSONWriter c3a = co.key("c.3").array();
            for (int c3i = 1; c3i <= 2; c3i++) {
              JSONWriter c3o = c3a.object();
              if (rand.nextBoolean()) {
                co.key("c.3.1").value(
                    "c.3.1_" + c3i + "+" + ci + "+" + i);
              }
              if (rand.nextBoolean()) {
                JSONWriter c34o = co.key("c.3.4").object();
                c34o.key("c.3.4.1").value("c.3.4.1_X");
                c34o.endObject();
              }
              c3o.endObject();
            }


            c3a.endArray();
          }


          co.endObject();
        }
        c.endArray();


        JSONWriter e = o.key("e").array();
        for (int ei = 1; ei <= 3; ei++) {
          e.object().key("e.1").value("e.1_" + ei).endObject();
        }
        e.endArray();


        o.endObject();
      }
      top.endArray();
    } catch (JSONException e) {
      e.printStackTrace();
      return null;
    }


    return x.toString();
  }

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