| /** |
| * 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.hcatalog.hbase; |
| |
| import java.io.Serializable; |
| import java.util.Map; |
| |
| |
| /** |
| * The class HCatTableSnapshot represents a snapshot of a hcatalog table. |
| * This class is intended to be opaque. This class would used only by the |
| * record readers to obtain knowledge about the revisions of a |
| * column to be filtered. |
| */ |
| public class HCatTableSnapshot implements Serializable{ |
| |
| private static final long serialVersionUID = 1L; |
| private String tableName; |
| private String databaseName; |
| private Map<String, Long> columnMap; |
| private long latestRevision; |
| |
| HCatTableSnapshot(String databaseName, String tableName, Map<String, Long> columnMap, long latestRevision) { |
| this.tableName = tableName; |
| this.databaseName = databaseName; |
| this.columnMap = columnMap; |
| this.latestRevision = latestRevision; |
| } |
| |
| /** |
| * @return The name of the table in the snapshot. |
| */ |
| public String getTableName() { |
| return this.tableName; |
| } |
| |
| /** |
| * @return The name of the database to which the table snapshot belongs. |
| */ |
| public String getDatabaseName(){ |
| return this.databaseName; |
| } |
| |
| /** |
| * @return The revision number of a column in a snapshot. |
| */ |
| long getRevision(String column){ |
| if(columnMap.containsKey(column)) |
| return this.columnMap.get(column); |
| return latestRevision; |
| } |
| |
| /** |
| * The method checks if the snapshot contains information about a data column. |
| * |
| * @param column The data column of the table |
| * @return true, if successful |
| */ |
| boolean containsColumn(String column){ |
| return this.columnMap.containsKey(column); |
| } |
| |
| /** |
| * @return latest committed revision when snapshot was taken |
| */ |
| long getLatestRevision() { |
| return latestRevision; |
| } |
| |
| @Override |
| public String toString() { |
| String snapshot = " Database Name: " + this.databaseName +" Table Name : " + tableName + |
| "Latest Revision: "+latestRevision+" Column revision : " + columnMap.toString(); |
| return snapshot; |
| } |
| } |