org.argeo.slc.server/src/main/java/org/argeo/slc/web/mvc/XsltMarshallerViewResolver.java

   1 package org.argeo.slc.web.mvc;
   2
   3 import java.io.IOException;
   4 import java.util.Map;
   5 import java.util.TreeMap;
   6
   7 import javax.xml.transform.Source;
   8 import javax.xml.transform.TransformerException;
   9 import javax.xml.transform.URIResolver;
  10 import javax.xml.transform.stream.StreamSource;
  11
  12 import org.apache.commons.logging.Log;
  13 import org.apache.commons.logging.LogFactory;
  14 import org.argeo.slc.core.SlcException;
  15 import org.springframework.core.io.Resource;
  16 import org.springframework.oxm.Marshaller;
  17 import org.springframework.web.servlet.view.AbstractUrlBasedView;
  18 import org.springframework.web.servlet.view.xslt.XsltViewResolver;
  19
  20 public class XsltMarshallerViewResolver extends XsltViewResolver implements
  21                 URIResolver {
  22         private final static Log log = LogFactory
  23                         .getLog(XsltMarshallerViewResolver.class);
  24
  25         private Marshaller marshaller;
  26         private Map<String, Source> cacheUriResolver = new TreeMap<String, Source>();
  27
  28         public XsltMarshallerViewResolver() {
  29                 setUriResolver(this);
  30         }
  31
  32         @Override
  33         protected AbstractUrlBasedView buildView(String viewName) throws Exception {
  34                 AbstractUrlBasedView viewT = super.buildView(viewName);
  35                 XsltMarshallerView view = (XsltMarshallerView) viewT;
  36                 view.setMarshaller(marshaller);
  37                 return view;
  38         }
  39
  40         public void setMarshaller(Marshaller marshaller) {
  41                 this.marshaller = marshaller;
  42         }
  43
  44         @Override
  45         public Source resolve(String href, String base) throws TransformerException {
  46                 if (log.isTraceEnabled())
  47                         log.trace("Resolve URI for href=" + href + " base=" + base);
  48
  49                 Source res = null;
  50                 if (isCache())
  51                         res = cacheUriResolver.get(href);
  52
  53                 if (res == null)
  54                         res = getStylesheetSource(href);
  55
  56                 if (res == null)
  57                         res = getStylesheetSource(getPrefix() + href);
  58
  59                 if (res == null)
  60                         throw new SlcException("Can't resolve URI for href=" + href
  61                                         + " base=" + base);
  62
  63                 if (isCache() && !cacheUriResolver.containsKey(href))
  64                         cacheUriResolver.put(href, res);
  65
  66                 return res;
  67         }
  68
  69         protected Source getStylesheetSource(String url) {
  70                 if (log.isDebugEnabled()) {
  71                         log.debug("Loading XSLT stylesheet from '" + url + "'");
  72                 }
  73                 try {
  74                         final Resource stylesheetResource = getApplicationContext()
  75                                         .getResource(url);
  76                         String systemId = url.substring(0, url.lastIndexOf('/') + 1);
  77                         return new StreamSource(stylesheetResource.getInputStream(),
  78                                         systemId);
  79                 } catch (IOException e) {
  80                         if (log.isTraceEnabled())
  81                                 log.trace("Cannot load stylesheet " + url, e);
  82                         return null;
  83                 }
  84         }
  85
  86 }