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1 import net.sf.saxon.jdom.DocumentWrapper;
2 import net.sf.saxon.xpath.XPathEvaluator;
3 import net.sf.saxon.Configuration;
4 import org.jdom.Document;
5 import org.jdom.Element;
6 import org.jdom.JDOMException;
7 import org.jdom.input.SAXBuilder;
8
9 import javax.xml.transform.*;
10 import javax.xml.transform.stream.StreamResult;
11 import javax.xml.transform.stream.StreamSource;
12 import java.io.File;
13 import java.io.IOException;
14 import java.util.Iterator;
15
16 /**
17  * A simple example to show how SAXON can be used with a JDOM tree.
18  * It is designed to be used with the source document books.xml and the
19  * stylesheet total.xsl
20  * @author Michael H. Kay
21  */
22 public class JDOMExample {
23
24     private JDOMExample() {}
25
26     /**
27      * Method main
28      */
29     public static void main(String argv[])
30             throws TransformerException, TransformerConfigurationException,
31                    JDOMException, IOException {
32
33         if (argv.length == 2) {
34             transform(argv[0], argv[1]);
35         } else {
36             System.err.println("Usage: JDOMExample source.xml style.xsl >out.xml");
37         }
38
39     }
40
41     /**
42      * Show (a) use of freestanding XPath expressions against the JDOM document, and
43      * (b) the simplest possible transformation from system id to output stream.
44      */
45
46     public static void transform(String sourceID, String xslID)
47             throws TransformerException, TransformerConfigurationException,
48                    JDOMException, IOException {
49
50
51         // Build the JDOM document
52 SAXBuilder builder = new SAXBuilder();
53         Document doc = builder.build(new File(sourceID));
54
55         // Give it a Saxon wrapper
56 DocumentWrapper docw = new DocumentWrapper(doc, sourceID, new Configuration());
57
58         // Retrieve all the ITEM elements
59 XPathEvaluator xpath = new XPathEvaluator(docw);
60         Iterator iter = xpath.evaluate("//ITEM").iterator();
61
62         // For each of these, compute an additional attribute
63
64         while (iter.hasNext()) {
65             //NodeWrapper node = (NodeWrapper)enum.next();
66 //Element item = (Element)node.getUnderlyingNode();
67 Element item = (Element)iter.next();
68             String price = item.getChildText("PRICE");
69             String quantity = item.getChildText("QUANTITY");
70             try {
71                 double priceval = Double.parseDouble(price);
72                 double quantityval = Double.parseDouble(quantity);
73                 double value = priceval * quantityval;
74                 item.setAttribute("VALUE", ""+value);
75             } catch (NumberFormatException err) {
76                 item.setAttribute("VALUE", "?");
77             }
78         }
79
80         // Now do a transformation
81
82         System.setProperty("javax.xml.transform.TransformerFactory",
83                            "net.sf.saxon.TransformerFactoryImpl");
84         TransformerFactory tfactory = TransformerFactory.newInstance();
85
86         // Un-comment the following lines to get trace output from the transformation
87 // tfactory.setAttribute(net.sf.saxon.FeatureKeys.TRACE_LISTENER,
88 // new net.sf.saxon.trace.XSLTTraceListener());
89
90         Templates templates = tfactory.newTemplates(new StreamSource(xslID));
91         Transformer transformer = templates.newTransformer();
92
93         transformer.transform(docw, new StreamResult(System.out));
94
95     }
96
97
98 }
99
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