private static int compareToWithEqualityCheck()

in src/main/java/org/codehaus/groovy/runtime/typehandling/DefaultTypeTransformation.java [763:829]
61 lines of code
34 McCabe index (conditional complexity)

    private static int compareToWithEqualityCheck(Object left, Object right, boolean equalityCheckOnly) {
        if (left == right) {
            return 0;
        } else if (left == null) {
            return -1;
        } else if (right == null) {
            return 1;
        }
        Exception cause = null;
        if (left instanceof Comparable || left instanceof Number) {
            if (left instanceof Number) {
                if (right instanceof Character || right instanceof Number) {
                    return DefaultGroovyMethods.compareTo((Number) left, castToNumber(right));
                }
                if (isValidCharacterString(right)) {
                    return DefaultGroovyMethods.compareTo((Number) left, ShortTypeHandling.castToChar(right));
                }
            } else if (left instanceof Character) {
                if (isValidCharacterString(right)) {
                    return DefaultGroovyMethods.compareTo((Character) left, ShortTypeHandling.castToChar(right));
                }
                if (right instanceof Number) {
                    return DefaultGroovyMethods.compareTo((Character) left, (Number) right);
                }
                if (right instanceof String) {
                    return (left.toString()).compareTo((String) right);
                }
                if (right instanceof GString) {
                    return (left.toString()).compareTo(right.toString());
                }
            } else if (right instanceof Number) {
                if (isValidCharacterString(left)) {
                    return DefaultGroovyMethods.compareTo(ShortTypeHandling.castToChar(left), (Number) right);
                }
            } else if (left instanceof  String && (right instanceof String || right instanceof GString || right instanceof Character)) {
                return ((String) left).compareTo(right.toString());
            } else if (left instanceof GString && (right instanceof String || right instanceof GString || right instanceof Character)) {
                return left.toString().compareTo(right.toString());
            }
            if (!equalityCheckOnly || left.getClass().isAssignableFrom(right.getClass())
                    || (right.getClass() != Object.class && right.getClass().isAssignableFrom(left.getClass()) // GROOVY-4046
                        || right instanceof Comparable) // GROOVY-7954
            ) {
                // GROOVY-7876: when comparing for equality we try to only call compareTo when an assignable
                // relationship holds but with a container/holder class and because of erasure, we might still end
                // up with the prospect of a ClassCastException which we want to ignore but only if testing equality
                try {
                    // GROOVY-9711: don't rely on Java method selection
                    return (int) InvokerHelper.invokeMethod(left, "compareTo", right);
                } catch (ClassCastException cce) {
                    if (!equalityCheckOnly) cause = cce;
                }
            }
        }

        if (equalityCheckOnly) {
            return -1; // anything other than 0
        }

        String message = MessageFormat.format("Cannot compare {0} with value ''{1}'' and {2} with value ''{3}''",
                left.getClass().getName(), left, right.getClass().getName(), right);
        if (cause != null) {
            throw new IllegalArgumentException(message, cause);
        } else {
            throw new IllegalArgumentException(message);
        }
    }