| /* |
| * 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.carbondata.examples.util |
| |
| import java.io.DataOutputStream |
| |
| import scala.collection.mutable.{ArrayBuffer, HashSet} |
| |
| import org.apache.spark.SparkContext |
| |
| import org.apache.carbondata.common.logging.LogServiceFactory |
| import org.apache.carbondata.core.datastore.impl.FileFactory |
| |
| |
| object AllDictionaryUtil { |
| private val LOGGER = LogServiceFactory.getLogService(this.getClass.getCanonicalName) |
| def extractDictionary(sc: SparkContext, |
| srcData: String, |
| outputPath: String, |
| fileHeader: String, |
| dictCol: String): Unit = { |
| val fileHeaderArr = fileHeader.split(",") |
| val isDictCol = new Array[Boolean](fileHeaderArr.length) |
| for (i <- 0 until fileHeaderArr.length) { |
| if (dictCol.contains("|" + fileHeaderArr(i).toLowerCase() + "|")) { |
| isDictCol(i) = true |
| } else { |
| isDictCol(i) = false |
| } |
| } |
| val dictionaryRdd = sc.textFile(srcData).flatMap(x => { |
| val tokens = x.split(",") |
| val result = new ArrayBuffer[(Int, String)]() |
| for (i <- 0 until isDictCol.length) { |
| if (isDictCol(i)) { |
| try { |
| result += ((i, tokens(i))) |
| } catch { |
| case _: ArrayIndexOutOfBoundsException => |
| LOGGER.error("Read a bad record: " + x) |
| } |
| } |
| } |
| result |
| }).groupByKey().flatMap(x => { |
| val distinctValues = new HashSet[(Int, String)]() |
| for (value <- x._2) { |
| distinctValues.add(x._1, value) |
| } |
| distinctValues |
| }) |
| val dictionaryValues = dictionaryRdd.map(x => x._1 + "," + x._2).collect() |
| saveToFile(dictionaryValues, outputPath) |
| } |
| |
| def cleanDictionary(outputPath: String): Unit = { |
| try { |
| val file = FileFactory.getCarbonFile(outputPath) |
| if (file.exists()) { |
| file.delete() |
| } |
| } catch { |
| case ex: Exception => |
| LOGGER.error("Clean dictionary catching exception:" + ex) |
| } |
| } |
| |
| def saveToFile(contents: Array[String], outputPath: String): Unit = { |
| var writer: DataOutputStream = null |
| try { |
| val file = FileFactory.getCarbonFile(outputPath) |
| if (!file.exists()) { |
| file.createNewFile() |
| } |
| writer = FileFactory.getDataOutputStream(outputPath) |
| for (content <- contents) { |
| writer.writeBytes(content + "\n") |
| } |
| } catch { |
| case ex: Exception => |
| LOGGER.error("Save dictionary to file catching exception:" + ex) |
| } finally { |
| if (writer != null) { |
| try { |
| writer.close() |
| } catch { |
| case ex: Exception => |
| LOGGER.error("Close output stream catching exception:" + ex) |
| } |
| } |
| } |
| } |
| } |