1 files changed, 15 insertions, 11 deletions

diff --git a/src/main/java/cuchaz/enigma/mapping/ClassEntry.java b/src/main/java/cuchaz/enigma/mapping/ClassEntry.java
index 788811f..a49f8dd 100644
--- a/src/main/java/cuchaz/enigma/mapping/ClassEntry.java
+++ b/src/main/java/cuchaz/enigma/mapping/ClassEntry.java
@@ -11,18 +11,18 @@
 
 package cuchaz.enigma.mapping;
 
+import com.google.common.base.Preconditions;
 import com.google.common.collect.Lists;
 
 import java.util.List;
 
 public class ClassEntry implements Entry {
 
-        private String name;
+        private final String name;
 
         public ClassEntry(String className) {
-                if (className == null) {
-                        throw new IllegalArgumentException("Class name cannot be null!");
-                }
+                Preconditions.checkNotNull(className, "Class name cannot be null");
+
                 if (className.indexOf('.') >= 0) {
                         throw new IllegalArgumentException("Class name must be in JVM format. ie, path/to/package/class$inner : " + className);
                 }
@@ -49,12 +49,12 @@ public class ClassEntry implements Entry {
         }
 
         @Override
-        public ClassEntry getClassEntry() {
+        public ClassEntry getOwnerClassEntry() {
                 return this;
         }
 
         @Override
-        public ClassEntry cloneToNewClass(ClassEntry classEntry) {
+        public ClassEntry updateOwnership(ClassEntry classEntry) {
                 return classEntry;
         }
 
@@ -132,11 +132,7 @@ public class ClassEntry implements Entry {
         }
 
         public String getPackageName() {
-                int pos = this.name.lastIndexOf('/');
-                if (pos > 0) {
-                        return this.name.substring(0, pos);
-                }
-                return null;
+                return getPackageName(this.name);
         }
 
         public String getSimpleName() {
@@ -147,6 +143,14 @@ public class ClassEntry implements Entry {
                 return this.name;
         }
 
+        public static String getPackageName(String name) {
+                int pos = name.lastIndexOf('/');
+                if (pos > 0) {
+                        return name.substring(0, pos);
+                }
+                return null;
+        }
+
         public ClassEntry buildClassEntry(List<ClassEntry> classChain) {
                 assert (classChain.contains(this));
                 StringBuilder buf = new StringBuilder();