| /* |
| * 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.drill.exec.planner; |
| |
| import org.apache.hadoop.fs.Path; |
| |
| import java.util.List; |
| |
| /** |
| * Interface to define a partition. Partition could be simple, |
| * which represents a basic unit for partition, determined by |
| * the underlying storage plugin. On file system, a simple partition |
| * represents a file. Partition could be composite, consisting of |
| * other partitions. On file system storage plugin, a composite |
| * partition corresponds to a directory. |
| * |
| * Simple partition location keeps track the string representation of |
| * partition and also stores the value of the individual partition keys |
| * for this partition. Composite partition location keeps track the common |
| * partition keys, but does not keep track the the string representation of |
| * partition and leave it to each individual simple partition it consists of. |
| */ |
| public interface PartitionLocation { |
| /** |
| * Returns the value of the 'index' partition column |
| */ |
| String getPartitionValue(int index); |
| |
| /** |
| * Returns the path of this partition. |
| * Only a non-composite partition supports this. |
| */ |
| Path getEntirePartitionLocation(); |
| |
| /** |
| * Returns the list of the non-composite partitions that this partition consists of. |
| */ |
| List<SimplePartitionLocation> getPartitionLocationRecursive(); |
| |
| /** |
| * Returns if this is a simple or composite partition. |
| */ |
| boolean isCompositePartition(); |
| |
| /** |
| * Returns the path string of directory names only for composite partition |
| */ |
| Path getCompositePartitionPath(); |
| |
| } |