's;^\s+$;;' on all source files

And add checkstyle test for lines containing only whitespace characters.

smack-extensions/src/main/java/org/jivesoftware/smackx/xdata/Form.java

@@ -73,7 +73,7 @@ public class Form {
     public Form(DataForm dataForm) {
         this.dataForm = dataForm;
     }
-    
+
     /**
      * Creates a new Form of a given type from scratch.
      *
@@ -82,7 +82,7 @@ public class Form {
     public Form(DataForm.Type type) {
         this.dataForm = new DataForm(type);
     }
-    
+
     /**
      * Adds a new field to complete as part of the form.
      * 
@@ -91,7 +91,7 @@ public class Form {
     public void addField(FormField field) {
         dataForm.addField(field);
     }
-    
+
     /**
      * Sets a new String value to a given form's field. The field whose variable matches the 
      * requested variable will be completed with the specified value. If no field could be found 
@@ -401,7 +401,7 @@ public class Form {
     public DataForm.Type getType() {
         return dataForm.getType(); 
     }
-    
+
 
     /**
      * Sets instructions that explain how to fill out the form and what the form is about.
@@ -417,7 +417,7 @@ public class Form {
         }
         // Set the new list of instructions
         dataForm.setInstructions(instructionsList);
-        
+
     }
 
 
@@ -430,7 +430,7 @@ public class Form {
     public void setTitle(String title) {
         dataForm.setTitle(title);
     }
-    
+
     /**
      * Returns a DataForm that serves to send this Form to the server. If the form is of type 
      * submit, it may contain fields with no value. These fields will be removed since they only 
@@ -451,7 +451,7 @@ public class Form {
         }
         return dataForm;
     }
-    
+
     /**
      * Returns true if the form is a form to fill out.
      * 
@@ -460,7 +460,7 @@ public class Form {
     private boolean isFormType() {
         return DataForm.Type.form == dataForm.getType();
     }
-    
+
     /**
      * Returns true if the form is a form to submit.
      * 

smack-extensions/src/main/java/org/jivesoftware/smackx/xdata/packet/DataForm.java

@@ -73,11 +73,11 @@ public class DataForm implements ExtensionElement {
     private final List<Item> items = new ArrayList<Item>();
     private final List<FormField> fields = new ArrayList<FormField>();
     private final List<Element> extensionElements = new ArrayList<Element>();
-    
+
     public DataForm(Type type) {
         this.type = type;
     }
-    
+
     /**
      * Returns the meaning of the data within the context. The data could be part of a form
      * to fill out, a form submission or data results.
@@ -87,7 +87,7 @@ public class DataForm implements ExtensionElement {
     public Type getType() {
         return type; 
     }
-    
+
     /**
      * Returns the description of the data. It is similar to the title on a web page or an X 
      * window.  You can put a <title/> on either a form to fill out, or a set of data results.
@@ -214,7 +214,7 @@ public class DataForm implements ExtensionElement {
             fields.add(field);
         }
     }
-    
+
     /**
      * Adds a new instruction to the list of instructions that explain how to fill out the form 
      * and what the form is about. The dataform could include multiple instructions since each 
@@ -320,7 +320,7 @@ public class DataForm implements ExtensionElement {
         public static final String ELEMENT = "reported";
 
         private List<FormField> fields = new ArrayList<FormField>();
-        
+
         public ReportedData(List<FormField> fields) {
             this.fields = fields;
         }
@@ -345,7 +345,7 @@ public class DataForm implements ExtensionElement {
             return buf;
         }
     }
-    
+
     /**
      * 
      * Represents items of reported data.
@@ -356,11 +356,11 @@ public class DataForm implements ExtensionElement {
         public static final String ELEMENT = "item";
 
         private List<FormField> fields = new ArrayList<FormField>();
-        
+
         public Item(List<FormField> fields) {
             this.fields = fields;
         }
-        
+
         /**
          * Returns the fields that define the data that goes with the item.
          * 
@@ -369,7 +369,7 @@ public class DataForm implements ExtensionElement {
         public List<FormField> getFields() {
             return Collections.unmodifiableList(new ArrayList<FormField>(fields));
         }
-        
+
         public CharSequence toXML() {
             XmlStringBuilder buf = new XmlStringBuilder();
             buf.openElement(ELEMENT);