| /* |
| * 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.carbondata.hadoop; |
| |
| import java.io.Serializable; |
| import java.util.LinkedHashSet; |
| import java.util.Objects; |
| import java.util.Set; |
| |
| /** |
| * User can add required columns |
| */ |
| public class CarbonProjection implements Serializable { |
| |
| private static final long serialVersionUID = -4328676723039530713L; |
| |
| private Set<String> columns = new LinkedHashSet<>(); |
| |
| public CarbonProjection() { |
| } |
| |
| public CarbonProjection(String[] columnNames) { |
| Objects.requireNonNull(columnNames); |
| for (String columnName : columnNames) { |
| columns.add(columnName); |
| } |
| } |
| |
| public void addColumn(String column) { |
| columns.add(column); |
| } |
| |
| public String[] getAllColumns() { |
| return columns.toArray(new String[columns.size()]); |
| } |
| |
| public boolean isEmpty() { |
| return columns.isEmpty(); |
| } |
| } |