private Collection parseIntoCollection()

in juneau-core/juneau-marshall/src/main/java/org/apache/juneau/uon/UonParserSession.java [542:629]
78 lines of code
32 McCabe index (conditional complexity)

	private <E> Collection<E> parseIntoCollection(UonReader r, Collection<E> l, ClassMeta<E> type, boolean isUrlParamValue, BeanPropertyMeta pMeta) throws IOException, ParseException, ExecutableException {

		int c = r.readSkipWs();
		if (c == -1 || c == AMP)
			return null;
		if (c == 'n')
			return (Collection<E>)parseNull(r);

		int argIndex = 0;

		// If we're parsing a top-level parameter, we're allowed to have comma-delimited lists outside parenthesis (e.g. "&foo=1,2,3&bar=a,b,c")
		// This is not allowed at lower levels since we use comma's as end delimiters.
		boolean isInParens = (c == '@');
		if (! isInParens) {
			if (isUrlParamValue)
				r.unread();
			else
				throw new ParseException(this, "Could not find '(' marking beginning of collection.");
		} else {
			r.read();
		}

		if (isInParens) {
			final int S1=1; // Looking for starting of first entry.
			final int S2=2; // Looking for starting of subsequent entries.
			final int S3=3; // Looking for , or ) after first entry.

			int state = S1;
			while (c != -1 && c != AMP) {
				c = r.read();
				if (state == S1 || state == S2) {
					if (c == ')') {
						if (state == S2) {
							l.add((E)parseAnything(type.isArgs() ? type.getArg(argIndex++) : type.getElementType(),
									r.unread(), l, false, pMeta));
							r.read();
						}
						return l;
					} else if (Character.isWhitespace(c)) {
						skipSpace(r);
					} else {
						l.add((E)parseAnything(type.isArgs() ? type.getArg(argIndex++) : type.getElementType(),
								r.unread(), l, false, pMeta));
						state = S3;
					}
				} else if (state == S3) {
					if (c == ',') {
						state = S2;
					} else if (c == ')') {
						return l;
					}
				}
			}
			if (state == S1 || state == S2)
				throw new ParseException(this, "Could not find start of entry in array.");
			if (state == S3)
				throw new ParseException(this, "Could not find end of entry in array.");

		} else {
			final int S1=1; // Looking for starting of entry.
			final int S2=2; // Looking for , or & or END after first entry.

			int state = S1;
			while (c != -1 && c != AMP) {
				c = r.read();
				if (state == S1) {
					if (Character.isWhitespace(c)) {
						skipSpace(r);
					} else {
						l.add((E)parseAnything(type.isArgs() ? type.getArg(argIndex++) : type.getElementType(),
								r.unread(), l, false, pMeta));
						state = S2;
					}
				} else if (state == S2) {
					if (c == ',') {
						state = S1;
					} else if (Character.isWhitespace(c)) {
						skipSpace(r);
					} else if (c == AMP || c == -1) {
						r.unread();
						return l;
					}
				}
			}
		}

		return null;  // Unreachable.
	}