| /* |
| * 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.backend.hadoop.executionengine.mapReduceLayer; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| // Represent a set of sort keys. All the sort keys are equivalent. |
| // Eg: |
| // C = cogroup A by ($0, $1), B by ($0, $1) |
| // This query have two sort keys, (A.$0, A.$1) and (B.$0, B.$1) |
| public class SortKeyInfo { |
| private List<ColumnChainInfo> columnChains = new ArrayList<ColumnChainInfo>(); |
| private List<Boolean> ascs = new ArrayList<Boolean>(); |
| |
| public boolean moreSpecificThan(Object o2) |
| { |
| if (!(o2 instanceof SortKeyInfo)) |
| return false; |
| SortKeyInfo s2 = (SortKeyInfo)o2; |
| |
| if (columnChains.size()<s2.columnChains.size()) |
| return false; |
| for (int i=0;i<columnChains.size();i++) |
| { |
| if (i<s2.columnChains.size() && (!(columnChains.get(i).equals(s2.columnChains.get(i))) || |
| !ascs.get(i).equals(s2.ascs.get(i)))) |
| return false; |
| } |
| return true; |
| } |
| |
| public void insertColumnChainInfo(int index, ColumnChainInfo columnChainInfo, boolean asc) |
| { |
| if (columnChains.size()<=index) |
| { |
| columnChains.add(columnChainInfo); |
| ascs.add(asc); |
| return; |
| } |
| |
| ColumnChainInfo chain = columnChains.get(index); |
| chain.insertColumnChainInfo(columnChainInfo); |
| ascs.set(index, asc); |
| } |
| public String toString() { |
| return columnChains.toString(); |
| } |
| |
| public List<ColumnChainInfo> getColumnChains() { |
| return columnChains; |
| } |
| |
| public boolean[] getAscs() { |
| boolean[] result = new boolean[ascs.size()]; |
| for (int i=0;i<ascs.size();i++) |
| result[i] = ascs.get(i); |
| return result; |
| } |
| } |