Added support for VCD Database

com.minres.scviewer.database.text/src/com/minres/scviewer/database/text/TxRelation.groovy

@@ -0,0 +1,36 @@
+package com.minres.scviewer.database.text
+
+import com.minres.scviewer.database.ITxRelation
+import com.minres.scviewer.database.ITx;
+import com.minres.scviewer.database.RelationType;
+
+class TxRelation implements ITxRelation {
+	Tx source
+	
+	Tx target
+	
+	RelationType relationType
+	
+	
+	public TxRelation(RelationType relationType, Tx source, Tx target) {
+		this.source = source;
+		this.target = target;
+		this.relationType = relationType;
+	}
+
+	@Override
+	public RelationType getRelationType() {
+		return relationType;
+	}
+
+	@Override
+	public ITx getSource() {
+		return source;
+	}
+
+	@Override
+	public ITx getTarget() {
+		return target;
+	}
+
+}