fix checkstyle for core/EntityManager

hugegraph-core/src/main/java/com/baidu/hugegraph/auth/EntityManager.java

@@ -73,7 +73,7 @@ private HugeGraph graph() {
     }
 
     private String unhideLabel() {
-        return Hidden.unHide(this.label) ;
+        return Hidden.unHide(this.label);
     }
 
     public Id add(T entity) {

hugegraph-core/src/main/java/com/baidu/hugegraph/auth/RelationshipManager.java

@@ -77,7 +77,7 @@ private HugeGraph graph() {
     }
 
     private String unhideLabel() {
-        return Hidden.unHide(this.label) ;
+        return Hidden.unHide(this.label);
     }
 
     public Id add(T relationship) {

hugegraph-core/src/main/java/com/baidu/hugegraph/auth/SchemaDefine.java

@@ -56,7 +56,7 @@ public SchemaDefine(HugeGraphParams graph, String label) {
     public abstract void initSchemaIfNeeded();
 
     protected SchemaManager schema() {
-         return this.graph.graph().schema();
+        return this.graph.graph().schema();
     }
 
     protected boolean existVertexLabel(String label) {
@@ -116,7 +116,7 @@ protected static String unhideField(String label, String key) {
         return Hidden.unHide(label) + "_" + key;
     }
 
-    public static abstract class AuthElement implements Serializable {
+    public abstract static class AuthElement implements Serializable {
 
         private static final long serialVersionUID = 8746691160192814973L;
 
@@ -241,7 +241,7 @@ protected Object[] asArray(List<Object> list) {
     }
 
     // NOTE: travis-ci fails if class Entity implements Nameable
-    public static abstract class Entity extends AuthElement
+    public abstract static class Entity extends AuthElement
                            implements com.baidu.hugegraph.type.Nameable {
 
         private static final long serialVersionUID = 4113319546914811762L;
@@ -270,14 +270,16 @@ public String idString() {
         }
     }
 
-    public static abstract class Relationship extends AuthElement {
+    public abstract static class Relationship extends AuthElement {
 
         private static final long serialVersionUID = -1406157381685832493L;
 
         public abstract String sourceLabel();
+
         public abstract String targetLabel();
 
         public abstract Id source();
+
         public abstract Id target();
 
         public static <T extends Relationship> T fromEdge(Edge edge,

hugegraph-core/src/main/java/com/baidu/hugegraph/backend/cache/CachedGraphTransaction.java

@@ -55,11 +55,11 @@
 
 public final class CachedGraphTransaction extends GraphTransaction {
 
-    private final static int MAX_CACHE_PROPS_PER_VERTEX = 10000;
-    private final static int MAX_CACHE_EDGES_PER_QUERY = 100;
-    private final static float DEFAULT_LEVEL_RATIO = 0.001f;
-    private final static long AVG_VERTEX_ENTRY_SIZE = 40L;
-    private final static long AVG_EDGE_ENTRY_SIZE = 100L;
+    private static final int MAX_CACHE_PROPS_PER_VERTEX = 10000;
+    private static final int MAX_CACHE_EDGES_PER_QUERY = 100;
+    private static final float DEFAULT_LEVEL_RATIO = 0.001f;
+    private static final long AVG_VERTEX_ENTRY_SIZE = 40L;
+    private static final long AVG_EDGE_ENTRY_SIZE = 100L;
 
     private final Cache<Id, Object> verticesCache;
     private final Cache<Id, Object> edgesCache;

hugegraph-core/src/main/java/com/baidu/hugegraph/backend/cache/OffheapCache.java

@@ -51,7 +51,7 @@
 
 public class OffheapCache extends AbstractCache<Id, Object> {
 
-    private final static long VALUE_SIZE_TO_SKIP = 100 * Bytes.KB;
+    private static final long VALUE_SIZE_TO_SKIP = 100 * Bytes.KB;
 
     private final OHCache<Id, Value> cache;
     private final HugeGraph graph;
@@ -128,7 +128,7 @@ protected boolean write(Id id, Object value, long timeOffset) {
         long expireTime = this.expire();
         boolean success;
         if (expireTime <= 0L) {
-             success = this.cache.put(id, serializedValue);
+            success = this.cache.put(id, serializedValue);
         } else {
             expireTime += now() + timeOffset;
             /*

hugegraph-core/src/main/java/com/baidu/hugegraph/backend/id/IdGenerator.java

@@ -36,19 +36,19 @@ public abstract class IdGenerator {
 
     public abstract Id generate(HugeVertex vertex);
 
-    public final static Id of(String id) {
+    public static final Id of(String id) {
         return new StringId(id);
     }
 
-    public final static Id of(UUID id) {
+    public static final Id of(UUID id) {
         return new UuidId(id);
     }
 
-    public final static Id of(String id, boolean uuid) {
+    public static final Id of(String id, boolean uuid) {
         return uuid ? new UuidId(id) : new StringId(id);
     }
 
-    public final static Id of(long id) {
+    public static final Id of(long id) {
         return new LongId(id);
     }
 
@@ -65,7 +65,7 @@ public static Id of(Object id) {
         return new ObjectId(id);
     }
 
-    public final static Id of(byte[] bytes, IdType type) {
+    public static final Id of(byte[] bytes, IdType type) {
         switch (type) {
             case LONG:
                 return new LongId(bytes);
@@ -78,7 +78,7 @@ public final static Id of(byte[] bytes, IdType type) {
         }
     }
 
-    public final static Id ofStoredString(String id, IdType type) {
+    public static final Id ofStoredString(String id, IdType type) {
         switch (type) {
             case LONG:
                 return of(LongEncoding.decodeSignedB64(id));
@@ -92,7 +92,7 @@ public final static Id ofStoredString(String id, IdType type) {
         }
     }
 
-    public final static String asStoredString(Id id) {
+    public static final String asStoredString(Id id) {
         switch (id.type()) {
             case LONG:
                 return LongEncoding.encodeSignedB64(id.asLong());
@@ -105,7 +105,7 @@ public final static String asStoredString(Id id) {
         }
     }
 
-    public final static IdType idType(Id id) {
+    public static final IdType idType(Id id) {
         if (id instanceof LongId) {
             return IdType.LONG;
         }
@@ -121,7 +121,7 @@ public final static IdType idType(Id id) {
         return IdType.UNKNOWN;
     }
 
-    private final static int compareType(Id id1, Id id2) {
+    private static final int compareType(Id id1, Id id2) {
         return idType(id1).ordinal() - idType(id2).ordinal();
     }
 

hugegraph-core/src/main/java/com/baidu/hugegraph/task/TaskCallable.java

@@ -174,7 +174,7 @@ public V call() throws Exception {
         };
     }
 
-    public static abstract class SysTaskCallable<V> extends TaskCallable<V> {
+    public abstract static class SysTaskCallable<V> extends TaskCallable<V> {
 
         private HugeGraphParams params = null;