| /** |
| * 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.metron.common.csv; |
| |
| import com.google.common.base.Splitter; |
| import com.google.common.collect.Iterables; |
| import com.opencsv.CSVParser; |
| import com.opencsv.CSVParserBuilder; |
| |
| import java.io.IOException; |
| import java.io.Serializable; |
| import java.util.AbstractMap; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| |
| import static org.apache.commons.lang3.StringUtils.isEmpty; |
| |
| /** |
| * Based on the parser config field `COLUMNS_KEY` the log line is |
| * transformed into a intermediate result using the CSV parser. |
| * |
| * <p>All keys in `COLUMNS_KEY` and values extracted from the log line |
| * will be trimmed before adding to `values`. |
| */ |
| public class CSVConverter implements Serializable { |
| public static final String COLUMNS_KEY="columns"; |
| public static final String SEPARATOR_KEY="separator"; |
| protected Map<String, Integer> columnMap = new HashMap<>(); |
| protected CSVParser parser; |
| |
| public Map<String, Integer> getColumnMap() { |
| return columnMap; |
| } |
| |
| public CSVParser getParser() { |
| return parser; |
| } |
| |
| /** |
| * Converts a CSV line to a map of column name -> value. |
| * |
| * @param line The line to be turned into a map |
| * @return A map from column name -> value in the line |
| * @throws IOException If there's an issue parsing the line |
| */ |
| public Map<String, String> toMap(String line) throws IOException { |
| if(ignore(line)) { |
| return null; |
| } |
| String[] tokens = parser.parseLine(line); |
| Map<String, String> values = new HashMap<>(); |
| for(Map.Entry<String, Integer> kv : columnMap.entrySet()) { |
| values.put(kv.getKey().trim(), tokens[kv.getValue()].trim()); |
| } |
| return values; |
| } |
| |
| /** |
| * Initializes the CSVConverter based on the provided config. The config should contain |
| * an entry for {@code columns}, and can optionally contain a {@code separator}. |
| * |
| * @param config The configuration used for setup |
| */ |
| public void initialize(Map<String, Object> config) { |
| if(config.containsKey(COLUMNS_KEY)) { |
| columnMap = getColumnMap(config); |
| } |
| else { |
| throw new IllegalStateException("CSVExtractor requires " + COLUMNS_KEY + " configuration"); |
| } |
| char separator = ','; |
| if(config.containsKey(SEPARATOR_KEY)) { |
| separator = config.get(SEPARATOR_KEY).toString().charAt(0); |
| |
| } |
| parser = new CSVParserBuilder().withSeparator(separator) |
| .build(); |
| } |
| |
| protected boolean ignore(String line) { |
| if(null == line) { |
| return true; |
| } |
| String trimmedLine = line.trim(); |
| return trimmedLine.startsWith("#") || isEmpty(trimmedLine); |
| } |
| |
| /** |
| * Given a column determines the column -> position. If the column contains data in the format |
| * {@code columnName:position}, use that. Otherwise, use the provided value of i. |
| * |
| * @param column The data in the column |
| * @param i The default position to use |
| * @return A map entry of column value -> position |
| */ |
| public static Map.Entry<String, Integer> getColumnMapEntry(String column, int i) { |
| if(column.contains(":")) { |
| Iterable<String> tokens = Splitter.on(':').split(column); |
| String col = Iterables.getFirst(tokens, null); |
| Integer pos = Integer.parseInt(Iterables.getLast(tokens)); |
| return new AbstractMap.SimpleEntry<>(col, pos); |
| } |
| else { |
| return new AbstractMap.SimpleEntry<>(column, i); |
| } |
| |
| } |
| |
| /** |
| * Retrieves the column map based on the columns key in the config map. |
| * |
| * <p>If the data is a string, the default is to split on ',' as a list of column names. |
| * |
| * <p>If the data is a list, the default is to used as the list of column names. |
| * |
| * <p>If the data is a map, it must be in the form columnName -> position. |
| * |
| * <p>For string and list, the data can be in the form columnName:position, and extracted |
| * appropriately. |
| * |
| * @param config Uses the columns key if defined to retrieve columns. |
| * @return A map from column -> position |
| */ |
| public static Map<String, Integer> getColumnMap(Map<String, Object> config) { |
| Map<String, Integer> columnMap = new HashMap<>(); |
| if(config.containsKey(COLUMNS_KEY)) { |
| Object columnsObj = config.get(COLUMNS_KEY); |
| if(columnsObj instanceof String) { |
| String columns = (String)columnsObj; |
| int i = 0; |
| for (String column : Splitter.on(',').split(columns)) { |
| Map.Entry<String, Integer> e = getColumnMapEntry(column, i++); |
| columnMap.put(e.getKey(), e.getValue()); |
| } |
| } |
| else if(columnsObj instanceof List) { |
| List columns = (List)columnsObj; |
| int i = 0; |
| for(Object column : columns) { |
| Map.Entry<String, Integer> e = getColumnMapEntry(column.toString(), i++); |
| columnMap.put(e.getKey(), e.getValue()); |
| } |
| } |
| else if(columnsObj instanceof Map) { |
| Map<Object, Object> map = (Map<Object, Object>)columnsObj; |
| for(Map.Entry<Object, Object> e : map.entrySet()) { |
| columnMap.put(e.getKey().toString(), Integer.parseInt(e.getValue().toString())); |
| } |
| } |
| } |
| return columnMap; |
| } |
| } |