| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| package org.apache.druid.segment; |
| |
| import org.apache.druid.guice.annotations.ExtensionPoint; |
| |
| import javax.annotation.Nullable; |
| |
| /** |
| * Object value selecting polymorphic "part" of the {@link ColumnValueSelector} interface. Users of {@link |
| * ColumnValueSelector#getObject()} are encouraged to reduce the parameter/field/etc. type to |
| * BaseObjectColumnValueSelector to make it impossible to accidently call any method other than {@link #getObject()}. |
| * |
| * All implementations of this interface MUST also implement {@link ColumnValueSelector}. |
| */ |
| @ExtensionPoint |
| public interface BaseObjectColumnValueSelector<T> |
| { |
| @Nullable |
| T getObject(); |
| |
| Class<? extends T> classOfObject(); |
| } |
