/**
* Parse the given, comma-separated string into a list of {@code MimeType} objects.
*
* @param mimeTypes the string to parse
* @return the list of mime types
* @throws IllegalArgumentException if the string cannot be parsed
*/
public static List<MimeType> parseMimeTypes(String mimeTypes) {
if (!Strings.hasLength(mimeTypes)) {
return Collections.emptyList();
}
String[] tokens = mimeTypes.split(",\\s*");
List<MimeType> result = new ArrayList<MimeType>(tokens.length);
for (String token : tokens) {
result.add(parseMimeType(token));
}
return result;
}
/**
* Parse the given String into a single {@code MimeType}.
*
* @param mimeType the string to parse
* @return the mime type
* @throws InvalidMimeTypeException if the string cannot be parsed
*/
public static MimeType parseMimeType(String mimeType) {
if (!Strings.hasLength(mimeType)) {
throw new InvalidMimeTypeException(mimeType, "'mimeType' must not be empty");
}
String[] parts = Strings.tokenizeToStringArray(mimeType, ";");
String fullType = parts[0].trim();
// java.net.HttpURLConnection returns a *; q=.2 Accept header
if (MimeType.WILDCARD_TYPE.equals(fullType)) {
fullType = "*/*";
}
int subIndex = fullType.indexOf('/');
if (subIndex == -1) {
throw new InvalidMimeTypeException(mimeType, "does not contain '/'");
}
if (subIndex == fullType.length() - 1) {
throw new InvalidMimeTypeException(mimeType, "does not contain subtype after '/'");
}
String type = fullType.substring(0, subIndex);
String subtype = fullType.substring(subIndex + 1, fullType.length());
if (MimeType.WILDCARD_TYPE.equals(type) && !MimeType.WILDCARD_TYPE.equals(subtype)) {
throw new InvalidMimeTypeException(
mimeType, "wildcard type is legal only in '*/*' (all mime types)");
}
Map<String, String> parameters = null;
if (parts.length > 1) {
parameters = new LinkedHashMap<String, String>(parts.length - 1);
for (int i = 1; i < parts.length; i++) {
String parameter = parts[i];
int eqIndex = parameter.indexOf('=');
if (eqIndex != -1) {
String attribute = parameter.substring(0, eqIndex);
String value = parameter.substring(eqIndex + 1, parameter.length());
parameters.put(attribute, value);
}
}
}
try {
return new MimeType(type, subtype, parameters);
} catch (UnsupportedCharsetException ex) {
throw new InvalidMimeTypeException(
mimeType, "unsupported charset '" + ex.getCharsetName() + "'");
} catch (IllegalArgumentException ex) {
throw new InvalidMimeTypeException(mimeType, ex.getMessage());
}
}