Question

I have String object with template base, something like:

<h1>{{header}}</h1>
{{#bug}}
{{/bug}}

{{#items}}
  {{#first}}
    <li><strong>{{name}}</strong></li>
  {{/first}}
  {{#link}}
    <li><a href="{{url}}">{{name}}</a></li>
  {{/link}}
{{/items}}

{{#empty}}
  <p>The list is empty.</p>
{{/empty}}

I want to pull another String object representing JSONObject and put its fields into template:

{
  "header": "Colors",
  "items": [
      {"name": "red", "first": true, "url": "#Red"},
      {"name": "green", "link": true, "url": "#Green"},
      {"name": "blue", "link": true, "url": "#Blue"}
  ],
  "empty": false
}

In the end I would get String representing HTML structure:

<h1>Colors</h1>
<li><strong>red</strong></li>
<li><a href="#Green">green</a></li>
<li><a href="#Blue">blue</a></li>

I don’t want to use any POJOs or Maps – only use standard String objects or alternatively convert second String into JSONObject to use it as a template’s context.
Could someone give me any example how to achieve that?
Thanks.

Edit: I don’t know anything about template/JSON structure while executing template – I have to play with unknown template/JSON and assume that they are correct.

Answer 1

I couldn’t find way to work on pure String objects – I am converting JSONObject to Map to get it working with Mustache. This is code for conversion:

public static Map<String, Object> toMap(JSONObject object) throws JSONException
{
    Map<String, Object> map = new HashMap();
    Iterator keys = object.keys();
    while (keys.hasNext())
    {
        String key = (String) keys.next();
        map.put(key, fromJson(object.get(key)));
    }
    return map;
}

public static List toList(JSONArray array) throws JSONException
{
    List list = new ArrayList();
    for (int i = 0; i < array.length(); i++)
    {
        list.add(fromJson(array.get(i)));
    }
    return list;
}

private static Object fromJson(Object json) throws JSONException
{
    if (json instanceof JSONObject)
    {
        return toMap((JSONObject) json);
    } else if (json instanceof JSONArray)
    {
        return toList((JSONArray) json);
    } else
    {
        return json;
    }
}

Usage:

mustacheTemplate.execute(JSONUtils.toMap(new JSONObject(myString)));