X-Git-Url: https://gerrit.simantics.org/r/gitweb?a=blobdiff_plain;f=bundles%2Forg.simantics.db.common%2Fsrc%2Forg%2Fsimantics%2Fdb%2Fcommon%2FMetadataUtils.java;fp=bundles%2Forg.simantics.db.common%2Fsrc%2Forg%2Fsimantics%2Fdb%2Fcommon%2FMetadataUtils.java;h=30e21ff52ea6a00b101cefcea6848ee3cf279dfe;hb=969bd23cab98a79ca9101af33334000879fb60c5;hp=0000000000000000000000000000000000000000;hpb=866dba5cd5a3929bbeae85991796acb212338a08;p=simantics%2Fplatform.git

diff --git a/bundles/org.simantics.db.common/src/org/simantics/db/common/MetadataUtils.java b/bundles/org.simantics.db.common/src/org/simantics/db/common/MetadataUtils.java
new file mode 100644
index 000000000..30e21ff52
--- /dev/null
+++ b/bundles/org.simantics.db.common/src/org/simantics/db/common/MetadataUtils.java
@@ -0,0 +1,44 @@
+package org.simantics.db.common;
+
+import java.lang.reflect.Method;
+import java.util.Map;
+
+import org.simantics.db.Metadata;
+import org.simantics.db.Session;
+import org.simantics.db.common.utils.Logger;
+import org.simantics.db.exception.ServiceException;
+
+public class MetadataUtils {
+
+    private static final boolean TRACE_METADATA_SERIALIZATION = false;
+
+    public static <T extends Metadata> boolean hasMetadata(Map<String,byte[]> metadata, Class<T> clazz) {
+    	return metadata.containsKey(clazz.getName());
+    }
+    
+    @SuppressWarnings("unchecked")
+    public static <T extends Metadata> T getMetadata(Session session, Map<String,byte[]> metadata, Class<T> clazz) throws ServiceException {
+        byte[] data = metadata.get(clazz.getName());
+        if (TRACE_METADATA_SERIALIZATION) {
+            if (data != null)
+                System.out.println("deserializing " + data.length + " bytes of metadata into " + clazz);
+        }
+        Method m;
+        try {
+            m = clazz.getMethod("deserialise", Session.class, byte[].class);
+            return (T) m.invoke(null, session, data);
+        } catch (Exception e) {
+            e.printStackTrace();
+            Logger.defaultLogError(e.toString());
+        }
+        return null;
+    }
+    
+    public static <T> void addMetadata(Session session, Map<String,byte[]> metadata, Metadata data) throws ServiceException {
+        byte[] blob = data.serialise(session);
+        if (TRACE_METADATA_SERIALIZATION)
+            System.out.println("serialized " + blob.length + " bytes of metadata into for " + data.getClass());
+        metadata.put(data.getClass().getName(), blob);
+    }
+    
+}