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