优化代码。

plusone-basic/plusone-basic-infrastructure/src/main/java/xyz/zhouxy/plusone/jdbc/JdbcRepositorySupport.java

@@ -8,6 +8,9 @@ import javax.annotation.Nonnull;
 import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;
 import org.springframework.jdbc.core.namedparam.SqlParameterSource;
 
+import com.google.common.base.Preconditions;
+
+import xyz.zhouxy.plusone.commons.annotation.Overridable;
 import xyz.zhouxy.plusone.domain.AggregateRoot;
 import xyz.zhouxy.plusone.domain.IRepository;
 
@@ -19,35 +22,33 @@ public abstract class JdbcRepositorySupport<T extends AggregateRoot<ID>, ID exte
         super(namedParameterJdbcTemplate);
     }
 
+    @Overridable
     protected abstract void doDelete(@Nonnull T entity);
 
+    @Overridable
     protected abstract Optional<T> doFindById(@Nonnull ID id);
 
+    @Overridable
     protected abstract T doInsert(@Nonnull T entity);
 
+    @Overridable
     protected abstract T doUpdate(@Nonnull T entity);
 
     @Override
     public final void delete(T entity) {
-        if (entity == null) {
-            throw new IllegalArgumentException("Cannot delete null.");
-        }
+        Preconditions.checkArgument(entity != null, "Cannot delete null.");
         doDelete(entity);
     }
 
     @Override
     public final Optional<T> find(ID id) {
-        if (id == null) {
-            throw new IllegalArgumentException("Id cannot be null.");
-        }
+        Preconditions.checkArgument(id != null, "Id cannot be null.");
         return doFindById(id);
     }
 
     @Override
     public final T save(T entity) {
-        if (entity == null) {
-            throw new IllegalArgumentException("Cannot save null.");
-        }
+        Preconditions.checkArgument(entity != null, "Cannot save null.");
         return entity.getId().isPresent() ? doUpdate(entity) : doInsert(entity);
     }