| /* |
| * 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.parquet.pig; |
| |
| import static org.apache.parquet.pig.PigSchemaConverter.pigSchemaToString; |
| |
| import java.util.Map; |
| import java.util.Set; |
| |
| import org.apache.pig.impl.logicalLayer.schema.Schema; |
| |
| /** |
| * Represents Pig meta data stored in the file footer |
| */ |
| public class PigMetaData { |
| |
| private static final String PIG_SCHEMA = "pig.schema"; |
| |
| /** |
| * @param keyValueMetaData the key values from the footer |
| * @return the parsed Pig metadata |
| */ |
| public static PigMetaData fromMetaData(Map<String, String> keyValueMetaData) { |
| if (keyValueMetaData.containsKey(PIG_SCHEMA)) { |
| return new PigMetaData(keyValueMetaData.get(PIG_SCHEMA)); |
| } |
| return null; |
| } |
| |
| /** |
| * @param keyValueMetaData the key values from the footers |
| * @return the list pig schemas from the footers |
| */ |
| public static Set<String> getPigSchemas(Map<String, Set<String>> keyValueMetaData) { |
| return keyValueMetaData.get(PIG_SCHEMA); |
| } |
| |
| private String pigSchema; |
| |
| /** |
| * @param pigSchema the pig schema of the file |
| */ |
| public PigMetaData(Schema pigSchema) { |
| this.pigSchema = pigSchemaToString(pigSchema); |
| } |
| |
| /** |
| * @param pigSchema the pig schema of the file |
| */ |
| public PigMetaData(String pigSchema) { |
| this.pigSchema = pigSchema; |
| } |
| |
| /** |
| * @param pigSchema the pig schema of the file |
| */ |
| public void setPigSchema(String pigSchema) { |
| this.pigSchema = pigSchema; |
| } |
| |
| /** |
| * @return the pig schema of the file |
| */ |
| public String getPigSchema() { |
| return pigSchema; |
| } |
| |
| /** |
| * @param map where to add the key values representing this metadata |
| */ |
| public void addToMetaData(Map<String, String> map) { |
| map.put(PIG_SCHEMA, pigSchema); |
| } |
| |
| } |