android-drill-json

public static Object drillJSONObject(JSONObject obj, String path) throws JSONException {
        if(path == null) {
            return null;
        } else if(path.length() == 0) {
            return null;
        }

        Object jumper = obj;
        String[] components = path.split("\\."); //Dots specifically not regex any char.
        for(String component : components) {
            if(!(jumper instanceof JSONObject) && !(jumper instanceof JSONArray)) {
                jumper = null;
                break;
            }

            int openBracketIndex = component.indexOf("[");
            if(openBracketIndex != -1) {
                String key = component.substring(0, openBracketIndex);
                if(jumper instanceof JSONObject) {
                    JSONObject jsonObj = (JSONObject)jumper;
                    jumper = jsonObj.opt(key);
                    if(jumper == null) {
                        break;
                    }
                }

                if(!(jumper instanceof JSONArray)) {
                    jumper = null;
                    break;
                }

                boolean validValue = false;
                int closeBracketIndex = component.indexOf("]", openBracketIndex);
                if(closeBracketIndex != -1) {
                    String bracketString = component.substring(openBracketIndex + 1, closeBracketIndex);
                    int bracketVal;
                    try {
                        bracketVal = Integer.valueOf(bracketString);
                        JSONArray arr = (JSONArray)jumper;
                        if(bracketVal < arr.length() && bracketVal >= 0) {
                            validValue = true;
                            jumper = arr.opt(bracketVal);
                        }
                    } catch(NumberFormatException e) {
                        //Do nothing
                        Logger.error("drillJSONObject exception thrown: " + e);
                    }
                }

                if(!validValue) {
                    jumper = null;
                }
            } else {
                JSONObject jsonObj = (JSONObject)jumper;
                jumper = jsonObj.opt(component);
            }

            if(jumper == null) {
                break;
            }
        }

        return jumper;
    }