Add String to SysConfig converter

modules/qi-sysconfig/src/main/java/org/jpos/qi/sysconfig/SysConfigConverter.java

@@ -0,0 +1,53 @@
+package org.jpos.qi.sysconfig;
+
+import com.vaadin.data.Converter;
+import com.vaadin.data.Result;
+import com.vaadin.data.ValueContext;
+import org.jpos.ee.DB;
+import org.jpos.ee.SysConfig;
+import org.jpos.ee.SysConfigManager;
+import org.jpos.qi.QI;
+
+public class SysConfigConverter implements Converter<SysConfig, String> {
+    private String prefix;
+    private boolean useValue;
+
+    public SysConfigConverter () {
+        this(null, false);
+    }
+
+    public SysConfigConverter (String prefix) {
+        this (prefix, false);
+    }
+    public SysConfigConverter (String prefix, boolean useValue) {
+        super();
+        this.prefix = prefix;
+        this.useValue = useValue;
+    }
+
+    @Override
+    public Result<String> convertToModel(SysConfig value, ValueContext context) {
+        if (value == null)
+            return Result.error("NULL value");
+        else {
+            String id = prefix != null ? value.getId().substring(prefix.length()) : value.getId();
+            String modelToSave = useValue ? value.getValue() : id;
+            return Result.ok(modelToSave);
+        }
+    }
+
+    @Override
+    public SysConfig convertToPresentation(String value, ValueContext context) {
+        if (value != null) {
+            try {
+                return DB.exec( (db) -> {
+                    SysConfigManager mgr = new SysConfigManager(db);
+                    return mgr.getObject(value);
+                });
+            } catch (Exception e) {
+                QI.getQI().getLog().error(e);
+            }
+        }
+        return null;
+    }
+}