private Map<String, List<String>> decodeParams(String s) {
Map<String, List<String>> params = new LinkedHashMap<String, List<String>>();
String name = null;
int pos = 0; // Beginning of the unprocessed region
int i; // End of the unprocessed region
char c = 0; // Current character
for (i = 0; i < s.length(); i++) {
c = s.charAt(i);
if (c == '=' && name == null) {
if (pos != i) {
name = decodeComponent(s.substring(pos, i), charset);
}
pos = i + 1;
} else if (c == '&') {
if (name == null && pos != i) {
// We haven't seen an `=' so far but moved forward.
// Must be a param of the form '&a&' so add it with
// an empty value.
addParam(params, decodeComponent(s.substring(pos, i), charset), "");
} else if (name != null) {
addParam(params, name, decodeComponent(s.substring(pos, i), charset));
name = null;
}
pos = i + 1;
}
}
if (pos != i) { // Are there characters we haven't dealt with?
if (name == null) { // Yes and we haven't seen any `='.
addParam(params, decodeComponent(s.substring(pos, i), charset), "");
} else { // Yes and this must be the last value.
addParam(params, name, decodeComponent(s.substring(pos, i), charset));
}
} else if (name != null) { // Have we seen a name without value?
addParam(params, name, "");
}
return params;
}
