| // 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.doris.common; |
| |
| /** |
| * "Indirection layer" that allows returning an object via an output |
| * parameter of a function call, similar to a pointer or reference parameter |
| * in C/C++. |
| * Example: |
| * Reference<T> ref = new Reference<T>(); |
| * createT(ref); // calls ref.setRef() |
| * <do something with ref.getRef()>; |
| */ |
| public class Reference<RefType> { |
| protected RefType ref; |
| |
| public Reference(RefType ref) { |
| this.ref = ref; |
| } |
| |
| public Reference() { |
| this.ref = null; |
| } |
| |
| public RefType getRef() { |
| return ref; |
| } |
| |
| public void setRef(RefType ref) { |
| this.ref = ref; |
| } |
| } |