| /* |
| * 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.metadata; |
| |
| import java.util.Arrays; |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.io.Text; |
| import org.apache.hadoop.io.Writable; |
| import org.apache.nutch.crawl.CrawlDatum; |
| import org.apache.nutch.crawl.Inlinks; |
| import org.apache.nutch.indexer.IndexingException; |
| import org.apache.nutch.indexer.IndexingFilter; |
| import org.apache.nutch.indexer.NutchDocument; |
| import org.apache.nutch.parse.Parse; |
| |
| /** |
| * Indexer which can be configured to extract metadata from the crawldb, parse |
| * metadata or content metadata. You can specify the properties "index.db.md", |
| * "index.parse.md" or "index.content.md" who's values are comma-delimited |
| * <code>key1,key2,key3</code>. |
| */ |
| public class MetadataIndexer implements IndexingFilter { |
| private Configuration conf; |
| private String[] dbFieldnames; |
| private String[] parseFieldnames; |
| private String[] contentFieldnames; |
| private String separator; |
| private Set<String> mvFields; |
| private static final String db_CONF_PROPERTY = "index.db.md"; |
| private static final String parse_CONF_PROPERTY = "index.parse.md"; |
| private static final String content_CONF_PROPERTY = "index.content.md"; |
| private static final String separator_CONF_PROPERTY = "index.metadata.separator"; |
| private static final String mvfields_CONF_PROPERTY = "index.metadata.multivalued.fields"; |
| |
| @Override |
| public NutchDocument filter(NutchDocument doc, Parse parse, Text url, |
| CrawlDatum datum, Inlinks inlinks) throws IndexingException { |
| |
| // just in case |
| if (doc == null) |
| return doc; |
| |
| // add the fields from crawldb |
| if (dbFieldnames != null) { |
| for (String metatag : dbFieldnames) { |
| Writable metadata = datum.getMetaData().get(new Text(metatag)); |
| if (metadata != null) |
| add(doc, metatag, metadata.toString()); |
| } |
| } |
| |
| // add the fields from parsemd |
| if (parseFieldnames != null) { |
| for (String metatag : parseFieldnames) { |
| for (String value : parse.getData().getParseMeta().getValues(metatag)) { |
| if (value != null) |
| add(doc, metatag, value); |
| } |
| } |
| } |
| |
| // add the fields from contentmd |
| if (contentFieldnames != null) { |
| for (String metatag : contentFieldnames) { |
| for (String value : parse.getData().getContentMeta().getValues(metatag)) { |
| if (value != null) |
| add(doc, metatag, value); |
| } |
| } |
| } |
| |
| return doc; |
| } |
| |
| protected void add(NutchDocument doc, String key, String value) { |
| if (separator == null || value.indexOf(separator) == -1 || !mvFields.contains(key)) { |
| value = value.trim(); |
| if (!value.isEmpty()) { |
| doc.add(key, value); |
| } |
| } else { |
| String[] parts = value.split(separator); |
| for (String part : parts) { |
| part = part.trim(); |
| if (!part.isEmpty()) { |
| doc.add(key, part); |
| } |
| } |
| } |
| } |
| |
| @Override |
| public void setConf(Configuration conf) { |
| this.conf = conf; |
| dbFieldnames = conf.getStrings(db_CONF_PROPERTY); |
| parseFieldnames = conf.getStrings(parse_CONF_PROPERTY); |
| contentFieldnames = conf.getStrings(content_CONF_PROPERTY); |
| |
| separator = conf.get(separator_CONF_PROPERTY, null); |
| mvFields = new HashSet<>( |
| Arrays.asList(conf.getStrings(mvfields_CONF_PROPERTY, new String[0]))); |
| // TODO check conflict between field names e.g. could have same label |
| // from different sources |
| |
| } |
| |
| @Override |
| public Configuration getConf() { |
| return this.conf; |
| } |
| } |