FilterDefinitionParser.java 文件源码

@MethodParser("random")
public Filter parseRandom(Element el) throws InvalidXMLException {
    Node node = new Node(el);
    Range<Double> chance;
    try {
        chance = Range.closedOpen(0d, XMLUtils.parseNumber(node, Double.class));
    } catch(InvalidXMLException e) {
        chance = XMLUtils.parseNumericRange(node, Double.class);
    }

    Range<Double> valid = Range.closed(0d, 1d);
    if (valid.encloses(chance)) {
        return proto.isNoOlderThan(ProtoVersions.EVENT_QUERIES) ? new RandomFilter(chance)
                                                                : new LegacyRandomFilter(chance);
    } else {
        double lower = chance.hasLowerBound() ? chance.lowerEndpoint() : Double.NEGATIVE_INFINITY;
        double upper = chance.hasUpperBound() ? chance.upperEndpoint() : Double.POSITIVE_INFINITY;
        double invalid;
        if(!valid.contains(lower)) {
            invalid = lower;
        } else {
            invalid = upper;
        }

        throw new InvalidXMLException("chance value (" + invalid + ") is not between 0 and 1", el);
    }
}