Metadata fixes related to !6

* Used an ordinary for loop instead of the foreach as both values and
names are in the same list and I need to loop through names only
* Removed the intermediary result boolean variable and returned directly
without breaking the loop
* Added the has otherProperties(String ...) method

simpleexample2/core/src/main/java/simpleex/core/MetaData.java

@@ -280,22 +280,37 @@ public class MetaData {
   }
   
   /**
-   * Convenience method to check if the metadat contains custom properties
+   * Convenience method to check if the metadata contains custom properties
    * that is other properties than the name and description
    * @return true if there are any properties apart from name and description false otherwise 
    */
   public boolean hasCustomProperties() {
-    boolean result = false;
-    final Iterator<String> props = this.propertyNames();
-    if(props.hasNext()) {
-      while (props.hasNext()) {
-        final String propName = props.next();
-        if((propName!=NAME_PROPERTY)&&(propName!=DESCRIPTION_PROPERTY)) {
-          result = true;
-          break;
-        }
+    return hasOtherProperties(NAME_PROPERTY, DESCRIPTION_PROPERTY);
+    /*for (int i = 0; i < this.properties.size(); i=i+2) {
+      String propertyName = this.properties.get(i);
+      if((propertyName != NAME_PROPERTY) && (propertyName != DESCRIPTION_PROPERTY)) {
+        return true;
+      }
+    }
+    return false;*/
+  }
+  
+  /**
+   * Convenience method to check if the metadata contains properties
+   * other than the ones given in a list
+   * @return true if there are any properties not in the list, false otherwise 
+   */
+  public boolean hasOtherProperties(String ... propertyNames) {
+    for (int i = 0; i < this.properties.size(); i=i+2) {
+      String propertyName = this.properties.get(i);
+      boolean inList = false;
+      for (int j = 0; j < propertyNames.length; j++) {
+        String knownPropertyName = propertyNames[j];
+        inList = inList || (propertyName == knownPropertyName);
       }
+      if(!inList) return true;
     }
-    return result;
+    return false;
   }
 }
+