org.argeo.cms/src/org/argeo/cms/integration/XslTemplate.java

   1 package org.argeo.cms.integration;
   2
   3 import java.io.ByteArrayInputStream;
   4 import java.io.ByteArrayOutputStream;
   5 import java.io.IOException;
   6 import java.io.InputStream;
   7 import java.io.OutputStream;
   8
   9 import javax.jcr.Node;
  10 import javax.jcr.RepositoryException;
  11 import javax.xml.transform.Result;
  12 import javax.xml.transform.Source;
  13 import javax.xml.transform.Transformer;
  14 import javax.xml.transform.TransformerConfigurationException;
  15 import javax.xml.transform.TransformerException;
  16 import javax.xml.transform.TransformerFactory;
  17 import javax.xml.transform.TransformerFactoryConfigurationError;
  18 import javax.xml.transform.stream.StreamResult;
  19 import javax.xml.transform.stream.StreamSource;
  20
  21 public class XslTemplate {
  22         private Transformer transformer;
  23
  24         public XslTemplate(InputStream in, String systemId) {
  25                 this(loadTransformer(in, systemId));
  26         }
  27
  28         public XslTemplate(Transformer transformer) {
  29                 this.transformer = transformer;
  30         }
  31
  32         private static Transformer loadTransformer(InputStream in, String systemId) {
  33                 try {
  34                         TransformerFactory tFactory = TransformerFactory.newInstance();
  35                         StreamSource stylesource = new StreamSource(in, systemId);
  36                         return tFactory.newTransformer(stylesource);
  37                 } catch (TransformerConfigurationException | TransformerFactoryConfigurationError e) {
  38                         throw new IllegalArgumentException("Cannot initialise stylesheet with systemId " + systemId, e);
  39                 }
  40         }
  41
  42         public synchronized void apply(Node node, OutputStream out) {
  43                 // TODO use a pool of Transformer instead of synchronized
  44                 try (ByteArrayOutputStream xml = new ByteArrayOutputStream()) {
  45                         node.getSession().exportDocumentView(node.getPath(), xml, true, false);
  46                         try (ByteArrayInputStream xmlIn = new ByteArrayInputStream(xml.toByteArray())) {
  47                                 Source source = new StreamSource(xmlIn);
  48                                 Result results = new StreamResult(out);
  49                                 transformer.transform(source, results);
  50                         }
  51                 } catch (IOException | RepositoryException | TransformerException e) {
  52                         throw new RuntimeException("Cannot process XSL template on " + node, e);
  53                 }
  54         }
  55 }