| // 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.impala.planner; |
| |
| import org.apache.impala.common.Id; |
| import org.apache.impala.common.IdGenerator; |
| |
| public class JoinTableId extends Id<JoinTableId> { |
| static int INVALID_JOIN_TABLE_ID = -1; |
| |
| // Construction only allowed via an IdGenerator. |
| protected JoinTableId(int id) { |
| super(id); |
| } |
| |
| public static JoinTableId INVALID; |
| static { |
| INVALID = new JoinTableId(INVALID_JOIN_TABLE_ID); |
| } |
| |
| public boolean isValid() { return id_ != INVALID_JOIN_TABLE_ID; } |
| |
| public static IdGenerator<JoinTableId> createGenerator() { |
| return new IdGenerator<JoinTableId>() { |
| @Override |
| public JoinTableId getNextId() { return new JoinTableId(nextId_++); } |
| @Override |
| public JoinTableId getMaxId() { return new JoinTableId(nextId_ - 1); } |
| }; |
| } |
| |
| @Override |
| public String toString() { |
| return String.format("%02d", id_); |
| } |
| } |