XStream – XML Transformation

XStream provides a TraxSource (extends SAXSource) that can be used as an input to XSLT transformation. The TraxSource uses a java Object and the corresponding XStream Object. The java object can then be directly converted to XSLT target without actually converting to XML. Lets look at an example

package com.studytrails.xml.xstream;

import java.util.ArrayList;

import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.TransformerFactoryConfigurationError;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;

import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.io.xml.TraxSource;

public class XStreamTransformationExample {
	public static void main(String[] args) throws TransformerFactoryConfigurationError, TransformerException {
		XStreamTransformationExample transformationExample = new XStreamTransformationExample();
		transformationExample.runTransformation();
	}

	private void runTransformation() throws TransformerFactoryConfigurationError, TransformerException {
		XStream xstream = new XStream();
		xstream.alias("rss", Rss2.class);
		xstream.alias("item", Item2.class);
		Rss2 rss = new Rss2();
		Channel2 channel = new Channel2();
		rss.channel = channel;
		channel.title = "Title";
		channel.link = "link";
		channel.image = new Image2();
		channel.image.link = "image link";
		Item2 item1 = new Item2();
		item1.link = "item link";
		item1.title = "Item Title";
		channel.items = new ArrayList<Item2>();
		channel.items.add(item1);
		System.out.println(xstream.toXML(rss));

		Transformer transformer = TransformerFactory.newInstance().newTransformer(new StreamSource("bbc.xsl"));
		TraxSource traxSource = new TraxSource(rss, xstream);
		StreamResult result = new StreamResult(System.out);
		transformer.transform(traxSource, result);
		
		// prints the html on console

	}
}

The XML.

		
			
			link
			
				image link
			
			
				
					
					item link
				
			
		
		

The Rss2 and other classes

package com.studytrails.xml.xstream;

import java.util.Arrays;
import java.util.List;

public class Rss2 {
	public Channel2 channel;

	@Override
	public String toString() {
		return "Rss [channel=" + channel + "]";
	}

}

class Channel2 {
	public String title;
	public String link;
	public String description;
	public String language;
	public String lastBuildDate;
	public String copyright;
	public Image2 image;
	public String ttl;
	public AtomLink a_link;
	public List items;

	public class AtomLink {
		public String href;
		public String rel;
		public String type;

		@Override
		public String toString() {
			return "AtomLink [href=" + href + ", rel=" + rel + ", type=" + type + "]";
		}

	}

	@Override
	public String toString() {
		return "Channel [title=" + title + ", link=" + link + ", description=" + description + ", language=" + language + ", lastBuildDate="
				+ lastBuildDate + ", copyright=" + copyright + ", image=" + image + ", ttl=" + ttl + ", a_link=" + a_link + ", items=" + items + "]";
	}

}

class Item2 {
	public String title;
	public String description;
	public String link;
	public String guid;
	public String pubDate;
	public MediaThumbnail[] media_thumbnails;

	@Override
	public String toString() {
		return "Item [title=" + title + ", link=" + link + ", guid=" + guid + ", pubDate=" + pubDate + ", media_thumbnails="
				+ Arrays.toString(media_thumbnails) + "]";
	}

	public class MediaThumbnail {
		public int width;
		public int height;
		public String url;

		@Override
		public String toString() {
			return "MediaThumbnail [width=" + width + ", height=" + height + ", url=" + url + "]";
		}

	}

}

class Image2 {
	public String url;
	public String title;
	public String link;
	public String width;
	public String height;

	@Override
	public String toString() {
		return "Image [url=" + url + ", title=" + title + ", link=" + link + ", width=" + width + ", height=" + height + "]";
	}

}