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Converts MathWebSearch queries to XQuery expressions.

There is a newer version: 1.0.0

package com.formulasearchengine.xmlhelper;

import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

/**
 * from http://stackoverflow.com/questions/229310/how-to-ignore-whitespace-while-reading-a-file-to-produce-an-xml-dom
 */
public class NdLst implements NodeList, Iterable {

    private final List nodes;

    public NdLst(NodeList list) {
        nodes = new ArrayList<>();
        for (int i = 0; i < list.getLength(); i++) {
            if (!isWhitespaceNode(list.item(i))) {
                nodes.add(list.item(i));
            }
        }
    }

    @Override
    public Node item(int index) {
        return nodes.get(index);
    }

    @Override
    public int getLength() {
        return nodes.size();
    }

    private static boolean isWhitespaceNode(Node n) {
        if (n.getNodeType() == Node.TEXT_NODE) {
            String val = n.getNodeValue();
            return val.trim().length() == 0;
        } else {
            return false;
        }
    }

    @Override
    public Iterator iterator() {
        return nodes.iterator();
    }
}