SettingsToStringSerializer

java/com.sap.sse.gwt/src/com/sap/sse/gwt/settings/SettingsToStringSerializer.java

@@ -0,0 +1,73 @@
+package com.sap.sse.gwt.settings;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Map.Entry;
+
+import com.google.gwt.http.client.URL;
+import com.sap.sse.common.settings.generic.GenericSerializableSettings;
+import com.sap.sse.common.settings.generic.SettingsMap;
+import com.sap.sse.common.settings.serializer.SettingsToStringMapSerializer;
+
+public class SettingsToStringSerializer {
+    private final SettingsToStringMapSerializer settingsToStringMapSerializer = new SettingsToStringMapSerializer();
+
+    public String fromSettings(GenericSerializableSettings settings) {
+        Map<String, Iterable<String>> serializedValues = settingsToStringMapSerializer.serialize(settings);
+        return writeParameterMapToString(serializedValues);
+    }
+
+    public String fromSettings(SettingsMap settings) {
+        Map<String, Iterable<String>> serializedValues = settingsToStringMapSerializer.serialize(settings);
+        return writeParameterMapToString(serializedValues);
+    }
+
+    private String writeParameterMapToString(Map<String, Iterable<String>> serializedValues) {
+        String settingsString = "";
+        for (Entry<String, Iterable<String>> val : serializedValues.entrySet()) {
+            String ekey = URL.encode(val.getKey());
+            for (String vval : val.getValue()) {
+                String evval = URL.encode(vval);
+                if (!settingsString.isEmpty()) {
+                    settingsString += "&";
+                }
+                settingsString += ekey + "=" + evval;
+            }
+        }
+        return settingsString;
+    }
+
+    public final <T extends GenericSerializableSettings> T fromString(String serializedSettings, T settings) {
+        Map<String, Iterable<String>> values = deserializeStringToMap(serializedSettings);
+        return settingsToStringMapSerializer.deserialize(settings, values);
+    }
+
+    public final <T extends SettingsMap> T fromString(String serializedSettings, T settings) {
+        Map<String, Iterable<String>> values = deserializeStringToMap(serializedSettings);
+        return settingsToStringMapSerializer.deserializeSettingsMap(settings, values);
+    }
+
+    @SuppressWarnings({ "unchecked", "rawtypes" })
+    private Map<String, Iterable<String>> deserializeStringToMap(String serializedSettings) {
+        Map<String, Iterable<String>> values = new HashMap<>();
+        String[] singleSettings = serializedSettings.split("&");
+        for (String entry : singleSettings) {
+            String[] entryParts = entry.split("=");
+            // TODO determine what kind of error handling could be done here, if the url was wrongly edited manually
+            String key = URL.decode(entryParts[0]);
+            String value = URL.decode(entryParts[1]);
+            Iterable<String> listOrNull = values.get(key);
+            if(listOrNull == null){
+                listOrNull = new ArrayList<>();
+                values.put(key, listOrNull);
+            }
+            // can only be a arraylist at this point
+            ((ArrayList)listOrNull).add(value);
+            
+        }
+
+        return values;
+    }
+
+}