patch for DozerMapper#100

Author: Dimitri Alexeev

core/src/main/java/org/dozer/classmap/ClassMapBuilder.java

@@ -236,9 +236,8 @@ public boolean apply(ClassMap classMap, Configuration configuration) {
           Mapping mapping = readMethod.getAnnotation(Mapping.class);
           String propertyName = property.getName();
           if (mapping != null) {
-            validate(mapping, readMethod);
-            String pairName = mapping.value();
-            GeneratorUtils.addGenericMapping(classMap, configuration, propertyName, pairName);
+            String pairName = mapping.value().trim();
+            GeneratorUtils.addGenericMapping(classMap, configuration, propertyName, pairName.isEmpty() ? propertyName : pairName);
           }
         }
       }
@@ -251,9 +250,8 @@ public boolean apply(ClassMap classMap, Configuration configuration) {
           Mapping mapping = readMethod.getAnnotation(Mapping.class);
           String propertyName = property.getName();
           if (mapping != null) {
-            validate(mapping, readMethod);
-            String pairName = mapping.value();
-            GeneratorUtils.addGenericMapping(classMap, configuration, pairName, propertyName);
+            String pairName = mapping.value().trim();
+            GeneratorUtils.addGenericMapping(classMap, configuration, pairName.isEmpty() ? propertyName : pairName, propertyName);
           }
         }
       }
@@ -275,9 +273,8 @@ public boolean apply(ClassMap classMap, Configuration configuration) {
           Mapping mapping = field.getAnnotation(Mapping.class);
           String fieldName = field.getName();
           if (mapping != null) {
-            validate(mapping, field);
-            String pairName = mapping.value();
-            addFieldMapping(classMap, configuration, fieldName, pairName);
+            String pairName = mapping.value().trim();
+            addFieldMapping(classMap, configuration, fieldName, pairName.isEmpty() ? fieldName : pairName);
           }
         }
         srcType = srcType.getSuperclass();
@@ -289,9 +286,8 @@ public boolean apply(ClassMap classMap, Configuration configuration) {
           Mapping mapping = field.getAnnotation(Mapping.class);
           String fieldName = field.getName();
           if (mapping != null) {
-            validate(mapping, field);
-            String pairName = mapping.value();
-            addFieldMapping(classMap, configuration, pairName, fieldName);
+            String pairName = mapping.value().trim();
+            addFieldMapping(classMap, configuration, pairName.isEmpty() ? fieldName : pairName, fieldName);
           }
         }
         destType = destType.getSuperclass();
@@ -317,12 +313,4 @@ private static void addFieldMapping(ClassMap classMap, Configuration configurati
     MappingUtils.applyGlobalCopyByReference(configuration, fieldMap, classMap);
     classMap.addFieldMapping(fieldMap);
   }
-
-  private static void validate(Mapping annotation, Member member) {
-    if (annotation.value().trim().equals("")) {
-      throw new MappingException("Mapping annotation value missing at " + member.getDeclaringClass().getName() + "."
-          + member.getName());
-    }
-  }
-
 }