| /* |
| * 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.nutch.indexer; |
| |
| import org.w3c.dom.Element; |
| import org.w3c.dom.Node; |
| import org.w3c.dom.NodeList; |
| |
| import java.util.Arrays; |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| |
| class MappingReader { |
| |
| /** |
| * Converts the tag "mapping" to a {@link Map} instance. |
| * |
| * @param mappingElement The tag "mapping" wrapped into an {@link Element} instance. |
| * @return The {@link Map} instance with the actions for mapping the fields. |
| */ |
| static Map<Actions, Map<String, List<String>>> parseMapping(Element mappingElement) { |
| Map<Actions, Map<String, List<String>>> parsedMapping = new HashMap<>(); |
| |
| //Getting rename action |
| Node node = mappingElement.getElementsByTagName("rename").item(0); |
| |
| if (node != null) { |
| NodeList fieldList = ((Element) node).getElementsByTagName("field"); |
| |
| Map<String, List<String>> fieldsMap = new HashMap<>(); |
| |
| for (int j = 0; j < fieldList.getLength(); j++) { |
| Element field = (Element) fieldList.item(j); |
| fieldsMap.put(field.getAttribute("source"), Collections.singletonList(field.getAttribute("dest"))); |
| } |
| |
| parsedMapping.put(Actions.RENAME, fieldsMap); |
| } |
| |
| //Getting copy action |
| node = mappingElement.getElementsByTagName("copy").item(0); |
| |
| if (node != null) { |
| NodeList fieldList = ((Element) node).getElementsByTagName("field"); |
| |
| Map<String, List<String>> fieldsMap = new HashMap<>(); |
| |
| for (int j = 0; j < fieldList.getLength(); j++) { |
| Element field = (Element) fieldList.item(j); |
| fieldsMap.put(field.getAttribute("source"), Arrays.asList(field.getAttribute("dest").split(","))); |
| } |
| |
| parsedMapping.put(Actions.COPY, fieldsMap); |
| } |
| |
| //Getting remove action |
| node = mappingElement.getElementsByTagName("remove").item(0); |
| |
| if (node != null) { |
| NodeList fieldList = ((Element) node).getElementsByTagName("field"); |
| |
| Map<String, List<String>> fieldsMap = new HashMap<>(); |
| |
| for (int j = 0; j < fieldList.getLength(); j++) { |
| Element field = (Element) fieldList.item(j); |
| fieldsMap.put(field.getAttribute("source"), null); |
| } |
| |
| parsedMapping.put(Actions.REMOVE, fieldsMap); |
| } |
| |
| return parsedMapping; |
| } |
| |
| /** |
| * Available actions for mapping fields. |
| */ |
| enum Actions { |
| RENAME, COPY, REMOVE |
| } |
| } |