TemplateFileLoader.java

package edu.sc.seis.sod.status;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;

import javax.xml.parsers.ParserConfigurationException;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

import edu.sc.seis.sod.CommonAccess;
import edu.sc.seis.sod.SodUtil;
import edu.sc.seis.sod.Start;

public class TemplateFileLoader {

    public static Element getTemplate(Element el) throws MalformedURLException,
            IOException, SAXException, ParserConfigurationException {
        Element templateEl = SodUtil.getElement(el, "template");
        if(templateEl == null || SodUtil.getNestedText(templateEl).equals("")) { throw new IllegalArgumentException("Expected the passed in element '"
                + el.getNodeName()
                + "' to have a template element, but none found"); }
        return getTemplate(CommonAccess.getLoader(),
                           SodUtil.getNestedText(templateEl));
    }

    public static Element getTemplate(ClassLoader cl, String loc)
            throws MalformedURLException, SAXException,
            ParserConfigurationException, IOException {
        URL url = getUrl(cl, loc);
        InputStream in = url.openStream();
        Document doc = Start.createDoc(new InputSource(in), loc);
        return (Element)doc.getFirstChild();
    }

    public static URL getUrl(ClassLoader cl, String loc)
            throws MalformedURLException {
        if(loc.startsWith("jar:")) {
            return cl.getResource(loc.substring(4));
        } else {
            try {
                return new URL(loc);
            } catch(MalformedURLException e) {
                return new File(loc).toURL();
            }
        }
    }
}