private static boolean identifier(Text t, List<Object> valueList) {
final boolean result;
final int start = t.cursor();
if (Identifier.consume(t)) {
final String string = t.getString(start);
valueList.add(new Identifier(string));
result = true;
} else {
result = false;
}
return result;
}
/**
* Parse a string and set the value accordingly.
*
* @param <T> Type of object to parse
* @param string The string to parse. May be null. The string should be in Oak markup so "a
* string", `/Some/Path`, etc.
* @return The parsed value.
* @see #toString(List)
* @throws ParsingException Thrown if the string cannot be parsed correctly.
*/
@SuppressWarnings("unchecked")
public <T> T parse(@Nullable String string) throws ParsingException {
final T result;
assert string != null : "Null string";
if (string.equals("null")) {
result = null;
} else {
switch (this) {
case text: // "a string"
try {
result = (T) StringU.removeQuotes(string);
} catch (final RuntimeException e) {
throw new ParsingException("Missing quotes");
}
break;
case identifier:
// Verify
Identifier.parse(string);
result = (T) string;
break;
case path:
result = (T) Path.parse(string);
if (result == null) {
throw new ParsingException("Invalid path: " + string);
}
break;
case bool:
// Boolean.parse() is not strict enough
if (string.equals("true")) {
result = (T) Boolean.TRUE;
} else if (string.equals("false")) {
result = (T) Boolean.FALSE;
} else {
throw new ParsingException("Invalid boolean, should be (true/false): " + string);
}
break;
case z:
try {
// Remove optional trailing 'z'
final int length = string.length();
if (length > 1 && string.charAt(length - 1) == 'z') {
result = (T) new Long(string.substring(0, length - 1));
} else {
result = (T) new Long(string);
}
} catch (final NumberFormatException e) {
throw new ParsingException("Invalid integer (Long): " + string, e);
}
break;
case Z:
try {
// Remove trailing 'Z'
final int end = string.length() - 1;
if (end < 0 || string.charAt(end) != 'Z') {
throw new ParsingException("Invalid number");
}
result = (T) new Long(string.substring(0, end));
} catch (final NumberFormatException e) {
throw new ParsingException("Invalid INTEGER (BigInteger): " + string, e);
}
break;
case f:
try {
// Remove optional trailing 'f'
final int length = string.length();
if (length > 1 && string.charAt(length - 1) == 'f') {
result = (T) new Double(string.substring(0, length - 1));
} else {
result = (T) new Double(string);
}
} catch (final NumberFormatException e) {
throw new ParsingException("Invalid float (Double): " + string, e);
}
break;
case F:
try {
// Remove trailing 'F'
final int end = string.length() - 1;
if (end < 0 || string.charAt(end) != 'F') {
throw new ParsingException("Invalid number");
}
result = (T) new Long(string.substring(0, end));
} catch (final NumberFormatException e) {
throw new ParsingException("Invalid FLOAT (BigDecimal): " + string, e);
}
break;
case cardinality:
try {
result = (T) Cardinality.newInstance(string);
} catch (final Cardinality.Exception e) {
throw new ParsingException("Invalid cardinality: " + string, e);
}
break;
case date:
if (string.length() == 0 || string.charAt(0) != '@') {
throw new ParsingException("Invalid date, missing leading '@': " + string);
}
try {
result = (T) DateU.parseStandardDate(string.substring(1));
} catch (final DateTimeParseException e) {
throw new ParsingException("Invalid date: " + string);
}
break;
case time:
if (string.length() == 0 || string.charAt(0) != '@') {
throw new ParsingException("Invalid time, missing leading '@': " + string);
}
try {
result = (T) DateU.parseStandardDate(string.substring(1));
} catch (final DateTimeParseException e) {
throw new ParsingException("Invalid time: " + string);
}
break;
case datetime:
if (string.length() == 0 || string.charAt(0) != '@') {
throw new ParsingException("Invalid datetime, missing leading '@': " + string);
}
try {
result = (T) DateU.parseStandardDate(string.substring(1));
} catch (final DateTimeParseException e) {
throw new ParsingException("Invalid datetime: " + string);
}
break;
case any:
default:
throw new UnexpectedException(string);
}
}
return result;
}