Sort source service /sources result by SourceKey.

src/main/java/org/ohdsi/webapi/service/SourceService.java

@@ -2,6 +2,8 @@
 
 import java.util.ArrayList;
 import java.util.Collection;
+import java.util.Collections;
+import java.util.Comparator;
 import javax.ws.rs.GET;
 import javax.ws.rs.Path;
 import javax.ws.rs.PathParam;
@@ -18,6 +20,22 @@
 @Component
 public class SourceService extends AbstractDaoService {
 
+  public class SortByKey implements Comparator<SourceInfo>
+  {
+    private boolean isAscending;
+
+    public SortByKey(boolean ascending) {
+      isAscending = ascending;      
+    }
+
+    public SortByKey() {
+      this(true);
+    }
+
+    public int compare(SourceInfo s1, SourceInfo s2) {
+      return s1.sourceKey.compareTo(s2.sourceKey) * (isAscending ? 1 : -1);
+    }    
+  }
   @Autowired
   private SourceRepository sourceRepository;
 
@@ -33,6 +51,7 @@ public Collection<SourceInfo> getSources() {
       for (Source source : sourceRepository.findAll()) {
         sources.add(new SourceInfo(source));
       }
+      Collections.sort(sources, new SortByKey());
       cachedSources = sources;
     }
     return cachedSources;