The mapreduce_1 from aurbroszniowski

This is the code implementation for my tutorial about MapReduce http://jsoftbiz.wordpress.com/2012/11/21/confused-about-mapreduce/

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give select support :frst and :last selector function

i want give select support :frst and :last selector function, code under this:

org.jsoup.select.QueryParser#consumeIndex

private int consumeIndex() {
String indexS = tq.chompTo(")").trim();

    if ("first".equals(indexS))
        return 0;
    else if ("last".equals(indexS))
        return -1;
    else if (indexS.startsWith("-"))
        return Integer.parseInt(indexS);

    Validate.isTrue(StringUtil.isNumeric(indexS), "Index must be numeric");
    return Integer.parseInt(indexS);
}

org.jsoup.select.Evaluator.IndexEquals

public static final class IndexEquals extends IndexEvaluator {
public IndexEquals(int index) {
super(index);
}

    @Override
    public boolean matches(Element root, Element element) {
        if(index < 0)
        {
            Element parent = element.parent();
            if (parent == null)
                return false;

            List<Element> siblings = parent.children();
            return siblings.size() + index >= 0 && element.equals(siblings.get(siblings.size() + index));
        }

        return element.elementSiblingIndex() == index;
    }

    @Override
    public String toString() {
        return String.format(":eq(%d)", index);
    }

}

Usage：

li:eq(first)
li:eq(last)
li:eq(-3)

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