| /* |
| * 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.pig.data; |
| |
| import java.util.Comparator; |
| import java.util.List; |
| import java.util.Set; |
| |
| /** |
| * Default implementation of BagFactory. |
| */ |
| public class DefaultBagFactory extends BagFactory { |
| /** |
| * Get a default (unordered, not distinct) data bag. |
| */ |
| @Override |
| public DataBag newDefaultBag() { |
| DataBag b = new DefaultDataBag(); |
| return b; |
| } |
| |
| /** |
| * Get a default (unordered, not distinct) data bag from |
| * an existing list of tuples. Note that the bag does NOT |
| * copy the tuples but uses the provided list as its backing store. |
| * So it takes ownership of the list. |
| */ |
| @Override |
| public DataBag newDefaultBag(List<Tuple> listOfTuples) { |
| DataBag b = new DefaultDataBag(listOfTuples); |
| return b; |
| } |
| |
| /** |
| * Get a limited sorted data bag. |
| * @param comp Comparator that controls how the data is sorted. |
| * If null, default comparator will be used. |
| */ |
| @Override |
| public DataBag newLimitedSortedBag(Comparator<Tuple> comp, long limit) { |
| DataBag b = new LimitedSortedDataBag(comp, limit); |
| return b; |
| } |
| |
| /** |
| * Get a sorted data bag. |
| * @param comp Comparator that controls how the data is sorted. |
| * If null, default comparator will be used. |
| */ |
| @Override |
| public DataBag newSortedBag(Comparator<Tuple> comp) { |
| DataBag b = new SortedDataBag(comp); |
| return b; |
| } |
| |
| /** |
| * Get a distinct data bag. |
| */ |
| @Override |
| public DataBag newDistinctBag() { |
| DataBag b = new DistinctDataBag(); |
| return b; |
| } |
| |
| /** |
| * Get a distinct data bag. |
| * @param tuples Distinct set of tuples used to initialize the bag. |
| * If null, an empty bag is returned. |
| */ |
| @Override |
| public DataBag newDistinctBag(Set<Tuple> tuples) { |
| if (tuples == null) { |
| return newDistinctBag(); |
| } |
| |
| DataBag b = new DistinctDataBag(tuples); |
| return b; |
| } |
| |
| DefaultBagFactory() { |
| super(); |
| } |
| |
| } |
| |