# HG changeset patch
# User Sebastien Jodogne <s.jodogne@gmail.com>
# Date 1680681739 -7200
# Node ID 367e8af46cfd53b9e4f99bb9edf9152759611a5a
# Parent  cd2258ca7894582c8ea73aa3d9a63cb9be5b3c5b
added "HasLabels" in /system

diff -r cd2258ca7894 -r 367e8af46cfd NEWS
--- a/NEWS	Wed Apr 05 09:07:47 2023 +0200
+++ b/NEWS	Wed Apr 05 10:02:19 2023 +0200
@@ -12,9 +12,9 @@
 * API version upgraded to 20
 * New URIs "/.../{id}/labels/{label}" to test/set/remove labels
 * "/tools/find" accepts the "WithLabels" and "WithoutLabels" arguments
-* The "/patients/{id}", "/studies/{id}", "/series/{id}" and "/instances/{id}"
+* "/patients/{id}", "/studies/{id}", "/series/{id}" and "/instances/{id}"
   contain the "Labels" field
-* "/system": added "UserMetadata"
+* "/system": added "UserMetadata" and "HasLabels"
 
 Plugins
 -------
diff -r cd2258ca7894 -r 367e8af46cfd OrthancServer/Sources/Database/StatelessDatabaseOperations.cpp
--- a/OrthancServer/Sources/Database/StatelessDatabaseOperations.cpp	Wed Apr 05 09:07:47 2023 +0200
+++ b/OrthancServer/Sources/Database/StatelessDatabaseOperations.cpp	Wed Apr 05 10:02:19 2023 +0200
@@ -1961,6 +1961,11 @@
       }
     };
 
+    if ((!withLabels.empty() || !withoutLabels.empty()) &&
+        !db_.HasLabelsSupport())
+    {
+      throw OrthancException(ErrorCode_NotImplemented, "The database backend doesn't support labels");
+    }
 
     std::vector<DatabaseConstraint> normalized;
     NormalizeLookup(normalized, lookup, queryLevel);
@@ -3630,4 +3635,11 @@
     Operations operations(publicId, level, label, operation);
     Apply(operations);
   }
+
+
+  bool StatelessDatabaseOperations::HasLabelsSupport()
+  {
+    boost::shared_lock<boost::shared_mutex> lock(mutex_);
+    return db_.HasLabelsSupport();
+  }
 }
diff -r cd2258ca7894 -r 367e8af46cfd OrthancServer/Sources/Database/StatelessDatabaseOperations.h
--- a/OrthancServer/Sources/Database/StatelessDatabaseOperations.h	Wed Apr 05 09:07:47 2023 +0200
+++ b/OrthancServer/Sources/Database/StatelessDatabaseOperations.h	Wed Apr 05 10:02:19 2023 +0200
@@ -765,5 +765,7 @@
                      ResourceType level,
                      const std::string& label,
                      LabelOperation operation);
+
+    bool HasLabelsSupport();
   };
 }
diff -r cd2258ca7894 -r 367e8af46cfd OrthancServer/Sources/OrthancRestApi/OrthancRestSystem.cpp
--- a/OrthancServer/Sources/OrthancRestApi/OrthancRestSystem.cpp	Wed Apr 05 09:07:47 2023 +0200
+++ b/OrthancServer/Sources/OrthancRestApi/OrthancRestSystem.cpp	Wed Apr 05 10:02:19 2023 +0200
@@ -89,6 +89,7 @@
     static const char* const MAXIMUM_STORAGE_SIZE = "MaximumStorageSize";
     static const char* const MAXIMUM_STORAGE_MODE = "MaximumStorageMode";
     static const char* const USER_METADATA = "UserMetadata";
+    static const char* const HAS_LABELS = "HasLabels";
 
     if (call.IsDocumentation())
     {
@@ -131,6 +132,8 @@
                         "The configured MaximumStorageMode (new in Orthanc 1.11.3)")
         .SetAnswerField(USER_METADATA, RestApiCallDocumentation::Type_JsonObject,
                         "The configured UserMetadata (new in Orthanc 1.12.0)")
+        .SetAnswerField(HAS_LABELS, RestApiCallDocumentation::Type_Boolean,
+                        "Whether the database back-end supports labels (new in Orthanc 1.12.0)")
         .SetHttpGetSample("https://demo.orthanc-server.com/system", true);
       return;
     }
@@ -187,6 +190,8 @@
     result[USER_METADATA] = Json::objectValue;
     GetUserMetadataConfiguration(result[USER_METADATA]);
 
+    result[HAS_LABELS] = OrthancRestApi::GetIndex(call).HasLabelsSupport();
+    
     call.GetOutput().AnswerJson(result);
   }