Prefer using constants to new strings

src/main/java/fr/soleil/archiving/snap/api/tools/SnapContext.java

@@ -36,6 +36,8 @@ import java.util.ArrayList;
 import java.util.Date;
 import java.util.List;
 
+import fr.soleil.lib.project.ObjectUtils;
+
 /**
  * <p/>
  * <B>Description :</B><BR>
@@ -59,12 +61,12 @@ import java.util.List;
  * @see fr.soleil.archiving.snap.api.tools.SnapAttributeHeavy
  */
 public class SnapContext {
-    private String author_name = "";
-    private String name = "";
+    private String author_name = ObjectUtils.EMPTY_STRING;
+    private String name = ObjectUtils.EMPTY_STRING;
     private int id = 0;
     private Date creation_date;
-    private String reason = "";
-    private String description = "";
+    private String reason = ObjectUtils.EMPTY_STRING;
+    private String description = ObjectUtils.EMPTY_STRING;
     private List<SnapAttributeLight> attributeList = new ArrayList<SnapAttributeLight>();
 
     /**
@@ -350,7 +352,7 @@ public class SnapContext {
 
     @Override
     public String toString() {
-        String snapString = new String("");
+        String snapString = new String(ObjectUtils.EMPTY_STRING);
         snapString = "Context" + "\r\n" + "Id : \t" + id + "\r\n" + "Author name : \t" + author_name + "\r\n"
                 + "Context name : \t" + name + "\r\n" + "Creation date : \t" + creation_date + "\r\n" + "Reason : \t"
                 + reason + "\r\n" + "Description : \t" + description + "\r\n" + "Attribute(s) : " + "\r\n";