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[CARBONDATA-2558] Optimize carbon schema reader interface of SDK
Optimize carbon schema reader interface of SDK 1.create CarbonSchemaReader and move schema read interface from CarbonReader to CarbonSchemaReader 2.change the return type from List to SDK Schema, remove the tableInfo return type 3.Optimize the document This closes #2353
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108 changes: 108 additions & 0 deletions
108
store/sdk/src/main/java/org/apache/carbondata/sdk/file/CarbonSchemaReader.java
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| /* | ||
| * 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. | ||
| */ | ||
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| package org.apache.carbondata.sdk.file; | ||
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| import java.io.DataInputStream; | ||
| import java.io.IOException; | ||
| import java.util.ArrayList; | ||
| import java.util.List; | ||
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| import org.apache.carbondata.core.datastore.filesystem.CarbonFile; | ||
| import org.apache.carbondata.core.datastore.impl.FileFactory; | ||
| import org.apache.carbondata.core.metadata.converter.SchemaConverter; | ||
| import org.apache.carbondata.core.metadata.converter.ThriftWrapperSchemaConverterImpl; | ||
| import org.apache.carbondata.core.metadata.schema.table.column.ColumnSchema; | ||
| import org.apache.carbondata.core.reader.CarbonHeaderReader; | ||
| import org.apache.carbondata.core.reader.CarbonIndexFileReader; | ||
| import org.apache.carbondata.core.util.CarbonUtil; | ||
| import org.apache.carbondata.core.util.path.CarbonTablePath; | ||
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| import static org.apache.carbondata.core.util.CarbonUtil.thriftColumnSchemaToWrapperColumnSchema; | ||
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| /** | ||
| * Schema reader for carbon files, including carbondata file, carbonindex file, and schema file | ||
| */ | ||
| public class CarbonSchemaReader { | ||
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| /** | ||
| * Read schema file and return the schema | ||
| * | ||
| * @param schemaFilePath complete path including schema file name | ||
| * @return schema object | ||
| * @throws IOException | ||
| */ | ||
| public static Schema readSchemaInSchemaFile(String schemaFilePath) throws IOException { | ||
| org.apache.carbondata.format.TableInfo tableInfo = CarbonUtil.readSchemaFile(schemaFilePath); | ||
| SchemaConverter schemaConverter = new ThriftWrapperSchemaConverterImpl(); | ||
| List<ColumnSchema> schemaList = schemaConverter | ||
| .fromExternalToWrapperTableInfo(tableInfo, "", "", "") | ||
| .getFactTable() | ||
| .getListOfColumns(); | ||
| return new Schema(schemaList); | ||
| } | ||
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| /** | ||
| * Read carbondata file and return the schema | ||
| * | ||
| * @param dataFilePath complete path including carbondata file name | ||
| * @return Schema object | ||
| * @throws IOException | ||
| */ | ||
| public static Schema readSchemaInDataFile(String dataFilePath) throws IOException { | ||
| CarbonHeaderReader reader = new CarbonHeaderReader(dataFilePath); | ||
| return new Schema(reader.readSchema()); | ||
| } | ||
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| /** | ||
| * Read carbonindex file and return the schema | ||
| * | ||
| * @param indexFilePath complete path including index file name | ||
| * @return schema object | ||
| * @throws IOException | ||
| */ | ||
| public static Schema readSchemaInIndexFile(String indexFilePath) throws IOException { | ||
| CarbonFile indexFile = | ||
| FileFactory.getCarbonFile(indexFilePath, FileFactory.getFileType(indexFilePath)); | ||
| if (!indexFile.getName().endsWith(CarbonTablePath.INDEX_FILE_EXT)) { | ||
| throw new IOException("Not an index file name"); | ||
| } | ||
| // read schema from the first index file | ||
| DataInputStream dataInputStream = | ||
| FileFactory.getDataInputStream(indexFilePath, FileFactory.getFileType(indexFilePath)); | ||
| byte[] bytes = new byte[(int) indexFile.getSize()]; | ||
| try { | ||
| //get the file in byte buffer | ||
| dataInputStream.readFully(bytes); | ||
| CarbonIndexFileReader indexReader = new CarbonIndexFileReader(); | ||
| // read from byte buffer. | ||
| indexReader.openThriftReader(bytes); | ||
| // get the index header | ||
| org.apache.carbondata.format.IndexHeader readIndexHeader = indexReader.readIndexHeader(); | ||
| List<ColumnSchema> columnSchemaList = new ArrayList<ColumnSchema>(); | ||
| List<org.apache.carbondata.format.ColumnSchema> table_columns = | ||
| readIndexHeader.getTable_columns(); | ||
| for (org.apache.carbondata.format.ColumnSchema columnSchema : table_columns) { | ||
| columnSchemaList.add(thriftColumnSchemaToWrapperColumnSchema(columnSchema)); | ||
| } | ||
| return new Schema(columnSchemaList); | ||
| } finally { | ||
| dataInputStream.close(); | ||
| } | ||
| } | ||
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| } |
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