+ //Finds json values which themselves contain String representations of json
+ //data and adds escape characters to the quotes. Example:
+ //Input: { "key1": "{"internalKey1": "internalValue1"}" }
+ //Output: { "key1": "{\"internalKey1\": \"internalValue1\"}" }
+ public static String escapeInternalJson(String jsonString) throws JSONException
+ {
+ StringBuilder sb = new StringBuilder();
+ char lastChar = 0;
+ boolean inJson = false;
+ for(char c : jsonString.toCharArray()) {
+ //If we see a { directly after a quote, it would mean that this string will contain json data
+ //as a string.
+ if(c == '{' && lastChar == '"') {
+ inJson = true;
+ }
+ //Checks if we are currently in a json block and if the character we are looking at is
+ //a quote. The quote is what needs to be escaped.
+ if(inJson && c == '"') {
+ //If a } precedes a quote, then this would signal the end of a string containing json
+ if(lastChar == '}') {
+ inJson = false;
+ //since this quote we are looking at is outside the json string block, we should not escape it
+ sb.append("\"");
+ } else {
+ //Else block for the case where the quote was preceded by anything other than a }
+ //We know we are still in the json string block
+ //If the last character was not a backslash, we know that the quote we are looking at has
+ //not been escaped.
+ if(lastChar != '\\') {
+ //un-escaped quote should be escaped
+ sb.append("\\\"");
+ } else {
+ //quote is already escaped, we can add it as it is
+ sb.append(c);
+ }
+ }
+ } else {
+ //If we are not in a json block, or if the character is not a quote, it can be added as is
+ sb.append(c);
+ }
+ if(!Character.isWhitespace(c)) {
+ lastChar = c;
+ }
+ }
+ if(inJson == true) {
+ //We reached the end of the string, but the internal string containing
+ //the json data to escape never ended.
+ throw new JSONException("End of json data reached, but end of internal"
+ + "json string never reached.");
+ }
+ return sb.toString();
+ }
+