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.DefaultResourceLoader;
  16 import org.springframework.core.io.Resource;
  17 import org.springframework.oxm.Marshaller;
  18 import org.springframework.web.servlet.view.AbstractUrlBasedView;
  19 import org.springframework.web.servlet.view.xslt.XsltViewResolver;
  20
  21 public class XsltMarshallerViewResolver extends XsltViewResolver implements
  22                 URIResolver {
  23         private final static Log log = LogFactory
  24                         .getLog(XsltMarshallerViewResolver.class);
  25
  26         private Marshaller marshaller;
  27         private Map<String, Source> cacheUriResolver = new TreeMap<String, Source>();
  28
  29         public XsltMarshallerViewResolver() {
  30                 setUriResolver(this);
  31         }
  32
  33         @Override
  34         protected AbstractUrlBasedView buildView(String viewName) throws Exception {
  35                 AbstractUrlBasedView viewT = super.buildView(viewName);
  36                 XsltMarshallerView view = (XsltMarshallerView) viewT;
  37                 view.setMarshaller(marshaller);
  38                 return view;
  39         }
  40
  41         public void setMarshaller(Marshaller marshaller) {
  42                 this.marshaller = marshaller;
  43         }
  44
  45         @Override
  46         public Source resolve(String href, String base) throws TransformerException {
  47                 if (log.isTraceEnabled())
  48                         log.trace("Resolve URI for href=" + href + " base=" + base);
  49
  50                 Source res = null;
  51                 if (isCache())
  52                         res = cacheUriResolver.get(href);
  53
  54                 if (res == null)
  55                         res = getStylesheetSource(href);
  56
  57                 if (res == null)
  58                         res = getStylesheetSource(getPrefix() + href);
  59
  60                 if (res == null)
  61                         throw new SlcException("Can't resolve URI for href=" + href
  62                                         + " base=" + base);
  63
  64                 if (isCache() && !cacheUriResolver.containsKey(href))
  65                         cacheUriResolver.put(href, res);
  66
  67                 return res;
  68         }
  69
  70         protected Source getStylesheetSource(String url) {
  71                 if (log.isDebugEnabled()) {
  72                         log.debug("Loading XSLT stylesheet from '" + url + "'");
  73                 }
  74                 try {
  75                         final Resource stylesheetResource = getApplicationContext()
  76                                         .getResource(url);
  77                         String systemId = url.substring(0, url.lastIndexOf('/') + 1);
  78                         return new StreamSource(stylesheetResource.getInputStream(),
  79                                         systemId);
  80                 } catch (IOException e) {
  81                         if (log.isTraceEnabled())
  82                                 log.trace("Cannot load stylesheet " + url, e);
  83                         return null;
  84                 }
  85         }
  86
  87 }