org.argeo.slc.core/src/main/java/org/argeo/slc/spring/SpringUtils.java

   1 package org.argeo.slc.spring;
   2
   3 import java.io.IOException;
   4 import java.net.URI;
   5 import java.net.URL;
   6 import java.util.Map;
   7
   8 import org.apache.commons.logging.Log;
   9 import org.apache.commons.logging.LogFactory;
  10 import org.argeo.slc.core.SlcException;
  11 import org.springframework.beans.factory.ListableBeanFactory;
  12 import org.springframework.core.io.DefaultResourceLoader;
  13 import org.springframework.core.io.Resource;
  14
  15 public class SpringUtils {
  16         private final static Log log = LogFactory.getLog(SpringUtils.class);
  17
  18         public static <T> T loadSingleFromContext(ListableBeanFactory context,
  19                         Class<T> clss) {
  20                 Map<String, T> beans = context.getBeansOfType(clss);
  21                 if (beans.size() == 1) {
  22                         return beans.values().iterator().next();
  23                 } else {
  24                         return null;
  25                 }
  26         }
  27
  28         public static Resource getParent(Resource res) {
  29                 try {
  30                         if (res.getURL().getPath().equals("/"))
  31                                 return null;
  32
  33                         String urlStr = res.getURL().toString();
  34                         if (urlStr.charAt(urlStr.length() - 1) == '/')
  35                                 urlStr = urlStr.substring(0, urlStr.length() - 2);
  36
  37                         String parentUrlStr = urlStr.substring(0, urlStr.lastIndexOf('/')) + '/';
  38                         URI uri = new URI(parentUrlStr).normalize();
  39                         return new DefaultResourceLoader(Thread.currentThread()
  40                                         .getContextClassLoader()).getResource(uri.toString());
  41                 } catch (Exception e) {
  42                         throw new SlcException("Cannot get parent for resource " + res, e);
  43                 }
  44         }
  45
  46         public static String extractRelativePath(Resource ancestor, Resource child) {
  47                 try {
  48
  49                         return ancestor.getURI().relativize(child.getURI()).normalize()
  50                                         .toString();
  51                 } catch (IOException e) {
  52                         throw new SlcException("Cannot extract relative path of " + child
  53                                         + " based on " + ancestor, e);
  54                 }
  55         }
  56
  57         private SpringUtils() {
  58
  59         }
  60 }