JDom XML过滤

Question

我正在尝试计算文档中有多少元素:

Iterator<?> processDescendants = doc.getDescendants(new ElementFilter("a")); 

while(processDescendants.hasNext()) {
   numPending++;
}

processDescendants = doc.getDescendants(new ElementFilter("b")); 

while(processDescendants.hasNext()) {
   numPending++;
}   

必须有一种更简单的方法......例如:

processDescendants = doc.getDescendants(new ElementFilter("a|b")); // something like Regex maybe?

有人可以帮忙吗？谢谢.

Answer 1

基本上有两种方法可以做到这一点.简单的方法就是走元素......

Iterator<?> processDescendants = doc.getDescendants(new ElementFilter()); 

while(processDescendants.hasNext()) {
   Element e =  processDescendants.Next();
   string currentName = e.getTagName();
   if( currentName.equals("a") || currentName.equals("b") )
   {
       numPending++;
   }
}

或者,您可以实现自己的过滤器来添加功能

import org.jdom.filter.Filter;
import org.jdom.Element;

public class ElementRegexFilter implements Filter {

    private String regex = "";

    public ElementRegexFilter( String regex )
    {
        this.regex = regex;
    }

    public boolean matches( Object o )
    {
        if( o instanceof Element )
        {
            String ElementName = ((Element) o).getName();
            return ElementName.matches( regex );
        }
        return false;
    }

}