/**
* Construct a JSONObject from a JSONTokener.
*
* @param x A JSONTokener object containing the source string.
* @throws JSONException If there is a syntax error in the source string or a duplicated key.
*/
public JSONObject(JSONTokener x) throws JSONException {
this();
char c;
String key;
if (x.nextClean() != '{') {
throw x.syntaxError("A JSONObject text must begin with '{'");
}
for (; ; ) {
c = x.nextClean();
switch (c) {
case 0:
throw x.syntaxError("A JSONObject text must end with '}'");
case '}':
return;
default:
x.back();
key = x.nextValue().toString();
}
/*
* The key is followed by ':'. We will also tolerate '=' or '=>'.
*/
c = x.nextClean();
if (c == '=') {
if (x.next() != '>') {
x.back();
}
} else if (c != ':') {
throw x.syntaxError("Expected a ':' after a key");
}
putOnce(key, x.nextValue());
/*
* Pairs are separated by ','. We will also tolerate ';'.
*/
switch (x.nextClean()) {
case ';':
case ',':
if (x.nextClean() == '}') {
return;
}
x.back();
break;
case '}':
return;
default:
throw x.syntaxError("Expected a ',' or '}'");
}
}
}
/**
* Construct a JSONObject from a subset of another JSONObject. An array of strings is used to
* identify the keys that should be copied. Missing keys are ignored.
*
* @param jo A JSONObject.
* @param names An array of strings.
* @exception JSONException If a value is a non-finite number or if a name is duplicated.
*/
public JSONObject(JSONObject jo, String[] names) throws JSONException {
this();
for (int i = 0; i < names.length; i += 1) {
putOnce(names[i], jo.opt(names[i]));
}
}