LuceneのHighlighterを使ってみる

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class="entry-title"> <a href="https://kazuhira-r.hatenablog.com/entry/20131001/1380635740" class="entry-title-link bookmark">LuceneのHighlighterを使ってみる</a> </h1> <div class="entry-categories categories"> <a href="https://kazuhira-r.hatenablog.com/archive/category/Lucene" class="entry-category-link category-Lucene">Lucene</a> </div> </header> <div class="entry-content hatenablog-entry"> <p><a class="keyword" href="http://d.hatena.ne.jp/keyword/Lucene">Lucene</a>に搭載されている、Highlighterを使ってみます。</p><p>Highlighter<br /> <a href="http://lucene.apache.org/core/4_4_0/highlighter/index.html">http://lucene.apache.org/core/4_4_0/highlighter/index.html</a></p><p>今回は、先に利用したコードから。</p><p>とりあえず、Document、インデックスは作成済みのものとします。Queryも作成してIndexSearcherに対して検索も実行済みとします。</p><p>まずは、SimpleHTMLFormatterの<a class="keyword" href="http://d.hatena.ne.jp/keyword/%A5%A4%A5%F3%A5%B9%A5%BF%A5%F3%A5%B9">インスタンス</a>を用意します。最終的にハイライトを行うのは、この上位にあるFormatterインターフェースを実装したクラスで決まるようです。</p> <pre class="code lang-scala" data-lang="scala" data-unlink><span class="synType">val</span> htmlFormatter = <span class="synStatement">new</span> SimpleHTMLFormatter() <span class="synComment">// 何もしていないと、<b></b>で囲まれる</span> <span class="synComment">// val htmlFormatter = new SimpleHTMLFormatter("<bold>", "</bold>") // コンストラクタで指定可能</span> </pre><p>ここでは、HTMLを使うSimpleHTMLFormatterクラスを使用します。デフォルトではbタグで囲まれますが、コンスト<a class="keyword" href="http://d.hatena.ne.jp/keyword/%A5%E9%A5%AF">ラク</a>タで明示的に指定することも可能です。</p><p>続いて、Highlighterの<a class="keyword" href="http://d.hatena.ne.jp/keyword/%A5%A4%A5%F3%A5%B9%A5%BF%A5%F3%A5%B9">インスタンス</a>を作成します。この時、Formatterの<a class="keyword" href="http://d.hatena.ne.jp/keyword/%A5%A4%A5%F3%A5%B9%A5%BF%A5%F3%A5%B9">インスタンス</a>と検索に使用したQueryをコンスト<a class="keyword" href="http://d.hatena.ne.jp/keyword/%A5%E9%A5%AF">ラク</a>タ引数に使用します。Queryは、QueryScorerでラップしますが。</p> <pre class="code lang-scala" data-lang="scala" data-unlink><span class="synType">val</span> highlighter = <span class="synStatement">new</span> Highlighter(htmlFormatter, <span class="synStatement">new</span> QueryScorer(query)) </pre><p>検索結果から取得できるScoreDocsの配列を使用して、通常通りIndexSearcherからDocumentを取得します。</p> <pre class="code lang-scala" data-lang="scala" data-unlink><span class="synStatement">for</span> (h <- hits) { <span class="synComment">// hitsはScoreDocの配列</span> <span class="synType">val</span> hitDoc = searcher.doc(h.doc) </pre><p>ここでは、ハイライト対象のフィールド名（String）がfield変数に入っていると仮定し、Documentからテキストを取得します。</p> <pre class="code lang-scala" data-lang="scala" data-unlink> <span class="synComment">// Highlighter</span> <span class="synType">val</span> text = hitDoc.get(field) <span class="synComment">// ハイライト対象のフィールドをDocumentから取得</span> </pre><p>TokenSources#getAnyTokenStreamから、IndexReader、DocumentのID、フィールド名、Analyzerを渡してTokenStreamを取得します。</p> <pre class="code lang-scala" data-lang="scala" data-unlink> <span class="synType">val</span> tokenStream = TokenSources.getAnyTokenStream(searcher.getIndexReader, h.doc, field, analyzer) </pre><p>先ほど作成したHighlighterのgetBestTextFragmentsメソッドを呼び出し、TextFragmentの配列を取得します。</p> <pre class="code lang-scala" data-lang="scala" data-unlink> <span class="synType">val</span> fragments = highlighter.getBestTextFragments(tokenStream, text, mergeContiguousFragments, maxNumFragments) </pre><p>ここで、第3、第4引数には</p> <pre class="code lang-scala" data-lang="scala" data-unlink> <span class="synType">val</span> mergeContiguousFragments = <span class="synConstant">false</span> <span class="synType">val</span> maxNumFragments = <span class="synConstant">10</span> </pre><p>を指定しています。</p><p>また、TextFragmentの配列ではなく、StringやString配列を受け取ることができるメソッドもあるようです。</p><p>最終的なハイライトされた値は、この取得したTextFragmentのうち、getScoreの戻り値が0より大きなものを拾えばよいみたいです。</p> <pre class="code lang-scala" data-lang="scala" data-unlink> fragments .withFilter(_.getScore > <span class="synConstant">0</span>) .foreach(f => println(s<span class="synConstant">" Fragment => $f"</span>)) </pre><p>実行例ですが、例えば「<a class="keyword" href="http://d.hatena.ne.jp/keyword/lucene">lucene</a>」と入力して、「<a class="keyword" href="http://d.hatena.ne.jp/keyword/lucene">lucene</a>」を含んだフィールドに対して摘要すると、</p> <pre class="code" data-lang="" data-unlink> Fragment => Apache <bold>Lucene</bold> 入門〜Java・オープンソース・全文検索システムの構築 Fragment => <bold>Lucene</bold>は全文検索システムを構築するためのJavaのライブラリです。</pre><p>のようにハイライトされます。</p><p>サンプル自体は、</p><p><a href="http://lucene.apache.org/core/4_4_0/highlighter/org/apache/lucene/search/highlight/package-summary.html">http://lucene.apache.org/core/4_4_0/highlighter/org/apache/lucene/search/highlight/package-summary.html</a></p><p>に載っているのであんまり迷わないのですが、一緒に載っているTerm <a class="keyword" href="http://d.hatena.ne.jp/keyword/Vector">Vector</a>が何で強調されているのかがわかりませんでした。Term <a class="keyword" href="http://d.hatena.ne.jp/keyword/Vector">Vector</a>、見てみた方がいいのかな？</p><p>それでは、今回作成したコードです。</p><p>build.sbt</p> <pre class="code lang-scala" data-lang="scala" data-unlink>name := <span class="synConstant">"lucene-highlighter"</span> version := <span class="synConstant">"0.0.1-SNAPSHOT"</span> scalaVersion := <span class="synConstant">"2.10.3"</span> organization := <span class="synConstant">"littlewings"</span> libraryDependencies ++= Seq( <span class="synConstant">"org.apache.lucene"</span> % <span class="synConstant">"lucene-analyzers-kuromoji"</span> % <span class="synConstant">"4.4.0"</span>, <span class="synConstant">"org.apache.lucene"</span> % <span class="synConstant">"lucene-queryparser"</span> % <span class="synConstant">"4.4.0"</span>, <span class="synConstant">"org.apache.lucene"</span> % <span class="synConstant">"lucene-highlighter"</span> % <span class="synConstant">"4.4.0"</span> ) </pre><p>src/main/<a class="keyword" href="http://d.hatena.ne.jp/keyword/scala">scala</a>/LuceneHighlighter.<a class="keyword" href="http://d.hatena.ne.jp/keyword/scala">scala</a></p> <pre class="code lang-scala" data-lang="scala" data-unlink><span class="synPreProc">import</span> scala.collection.JavaConverters._ <span class="synPreProc">import</span> scala.util.{Failure, Success, Try} <span class="synPreProc">import</span> org.apache.lucene.analysis.Analyzer <span class="synPreProc">import</span> org.apache.lucene.analysis.ja.JapaneseAnalyzer <span class="synPreProc">import</span> org.apache.lucene.document.{Document, Field, TextField, StringField} <span class="synPreProc">import</span> org.apache.lucene.index.{DirectoryReader, IndexWriter, IndexWriterConfig} <span class="synPreProc">import</span> org.apache.lucene.queryparser.classic.QueryParser <span class="synPreProc">import</span> org.apache.lucene.search.{IndexSearcher, Query, Sort, SortField} <span class="synPreProc">import</span> org.apache.lucene.search.{ScoreDoc, TopFieldCollector, TotalHitCountCollector} <span class="synPreProc">import</span> org.apache.lucene.store.{Directory, RAMDirectory} <span class="synPreProc">import</span> org.apache.lucene.util.Version <span class="synPreProc">import</span> org.apache.lucene.search.highlight.{Highlighter, QueryScorer, SimpleHTMLFormatter, TokenSources} <span class="synType">object</span> LuceneHighlighter { <span class="synIdentifier"> def</span> main(args: <span class="synConstant">Array</span>[<span class="synConstant">String</span>]): Unit = { <span class="synType">val</span> luceneVersion = Version.LUCENE_44 <span class="synType">val</span> analyzer = <span class="synStatement">new</span> JapaneseAnalyzer(luceneVersion) <span class="synStatement">for</span> (directory <- <span class="synStatement">new</span> RAMDirectory) { registryDocuments(directory, luceneVersion, analyzer) queryWhile(directory, luceneVersion, analyzer) } } <span class="synType">private</span><span class="synIdentifier"> def</span> registryDocuments(directory: Directory, luceneVersion: Version, analyzer: Analyzer): Unit = <span class="synStatement">for</span> (indexWriter <- <span class="synStatement">new</span> IndexWriter(directory, <span class="synStatement">new</span> IndexWriterConfig(luceneVersion, analyzer))) { indexWriter.addDocument(createBook(<span class="synConstant">"978-4894714991"</span>, <span class="synConstant">"Effective Java 第2版"</span>, <span class="synConstant">3780</span>, <span class="synConstant">"java"</span>, <span class="synConstant">"Javaプログラミング書籍の定本「Effective Java」の改訂版です。著者のGoogle, Sun Microsystemsにおけるソフトウェア開発で得た知識・経験をまとめた、JavaでプログラミングをするすべてのSE必読の書籍です。2001年の初版以降の追加項目、JavaSE6.0に対応。"</span>)) indexWriter.addDocument(createBook(<span class="synConstant">"978-4774139906"</span>, <span class="synConstant">"パーフェクトJava"</span>, <span class="synConstant">3780</span>, <span class="synConstant">"java"</span>, <span class="synConstant">"本書はJavaで開発を行う人へのバイブル的1冊です。Javaの基本から説明していますが、プログラミング一般の考え方や技法まで解説しています。"</span>)) indexWriter.addDocument(createBook(<span class="synConstant">"978-4774158785"</span>, <span class="synConstant">"AndroidエンジニアのためのモダンJava"</span>, <span class="synConstant">3360</span>, <span class="synConstant">"java"</span>, <span class="synConstant">"本書は、複雑かつ高度なAndroidアプリケーションの開発に必要となる、Java言語の基礎を理解することに主眼を置いて執筆されています。"</span>)) indexWriter.addDocument(createBook(<span class="synConstant">"978-4844330844"</span>, <span class="synConstant">"Scalaスケーラブルプログラミング第2版"</span>, <span class="synConstant">4830</span>, <span class="synConstant">"scala"</span>, <span class="synConstant">"言語設計者自ら、その手法と思想を説くScalaプログラミングバイブル!"</span>)) indexWriter.addDocument(createBook(<span class="synConstant">"978-4798125411"</span>, <span class="synConstant">"Scala逆引きレシピ (PROGRAMMER’S RECiPE)"</span>, <span class="synConstant">3360</span>, <span class="synConstant">"scala"</span>, <span class="synConstant">"Scalaでコードを書く際の実践ノウハウが凝縮!"</span>)) indexWriter.addDocument(createBook(<span class="synConstant">"978-4774127804"</span>, <span class="synConstant">"Apache Lucene 入門〜Java・オープンソース・全文検索システムの構築"</span>, <span class="synConstant">3360</span>, <span class="synConstant">"lucene"</span>, <span class="synConstant">"Luceneは全文検索システムを構築するためのJavaのライブラリです。"</span>)) indexWriter.addDocument(createBook(<span class="synConstant">"978-4774141756"</span>, <span class="synConstant">"Apache Solr入門 ―オープンソース全文検索エンジン"</span>, <span class="synConstant">3780</span>, <span class="synConstant">"solr"</span>, <span class="synConstant">"Apache Solrとは,オープンソースの検索エンジンです.Apache LuceneというJavaの全文検索システムをベースに豊富な拡張性をもたせ,多くの開発者が利用できるように作られました."</span>)) } <span class="synType">private</span><span class="synIdentifier"> def</span> createBook(isbn13: <span class="synConstant">String</span>, title: <span class="synConstant">String</span>, price: Int, category: <span class="synConstant">String</span>, abstraction: <span class="synConstant">String</span>): Document = { <span class="synType">val</span> document = <span class="synStatement">new</span> Document document.add(<span class="synStatement">new</span> StringField(<span class="synConstant">"isbn13"</span>, isbn13, Field.Store.YES)) document.add(<span class="synStatement">new</span> TextField(<span class="synConstant">"title"</span>, title, Field.Store.YES)) document.add(<span class="synStatement">new</span> StringField(<span class="synConstant">"price"</span>, price.toString, Field.Store.YES)) document.add(<span class="synStatement">new</span> StringField(<span class="synConstant">"category"</span>, category, Field.Store.YES)) document.add(<span class="synStatement">new</span> TextField(<span class="synConstant">"abstraction"</span>, abstraction, Field.Store.YES)) document } <span class="synType">private</span><span class="synIdentifier"> def</span> queryWhile(directory: Directory, luceneVersion: Version, analyzer: Analyzer): Unit = <span class="synStatement">for</span> (reader <- DirectoryReader.open(directory)) { <span class="synType">val</span> searcher = <span class="synStatement">new</span> IndexSearcher(reader) <span class="synType">val</span> queryParser = <span class="synStatement">new</span> QueryParser(luceneVersion, <span class="synConstant">"title"</span>, analyzer) <span class="synType">val</span> limit = <span class="synConstant">1000</span> <span class="synIdentifier"> def</span> parseQuery(line: <span class="synConstant">String</span>): Try[Query] = Try(queryParser.parse(line)) <span class="synIdentifier"> def</span> search(query: Query): (Query, Int, <span class="synConstant">Array</span>[ScoreDoc]) = { println(s<span class="synConstant">"Query => [$query]"</span>) <span class="synType">val</span> totalHitCountCollector = <span class="synStatement">new</span> TotalHitCountCollector searcher.search(query, totalHitCountCollector) <span class="synType">val</span> totalHits = totalHitCountCollector.getTotalHits <span class="synType">val</span> docCollector = TopFieldCollector.create(<span class="synStatement">new</span> Sort(<span class="synStatement">new</span> SortField(<span class="synConstant">"price"</span>, SortField.Type.STRING)), limit, <span class="synConstant">true</span>, <span class="synConstant">false</span>, <span class="synConstant">false</span>, <span class="synConstant">false</span>) searcher.search(query, docCollector) (query, totalHits, docCollector.topDocs.scoreDocs) } Iterator .continually(readLine(<span class="synConstant">"Lucene Query> "</span>)) .withFilter(l => l != <span class="synConstant">null</span> && !l.isEmpty) .takeWhile(l => l != <span class="synConstant">"exit"</span>) .map(parseQuery) .withFilter(q => q.recoverWith { <span class="synType">case</span> e => println(s<span class="synConstant">"Invalid Query => $e"</span>) Failure(e) }.isSuccess) .map(s => search(s.get)) .foreach { <span class="synType">case</span> (query, n, hits) => <span class="synStatement">if</span> (n > <span class="synConstant">0</span>) { println(s<span class="synConstant">"$n 件ヒットしました"</span>) <span class="synType">val</span> fields = <span class="synConstant">Array</span>(<span class="synConstant">"title"</span>, <span class="synConstant">"abstraction"</span>) <span class="synType">val</span> htmlFormatter = <span class="synStatement">new</span> SimpleHTMLFormatter() <span class="synComment">// 何もしていないと、<b></b>で囲まれる</span> <span class="synComment">// val htmlFormatter = new SimpleHTMLFormatter("<bold>", "</bold>") // コンストラクタで指定可能</span> <span class="synType">val</span> highlighter = <span class="synStatement">new</span> Highlighter(htmlFormatter, <span class="synStatement">new</span> QueryScorer(query)) <span class="synType">val</span> mergeContiguousFragments = <span class="synConstant">false</span> <span class="synType">val</span> maxNumFragments = <span class="synConstant">10</span> <span class="synStatement">for</span> (h <- hits) { <span class="synType">val</span> hitDoc = searcher.doc(h.doc) println(s<span class="synConstant">"Score,ID[${h.score}:${h.doc}] : Doc => "</span> + hitDoc .getFields .asScala .map(_.stringValue) .mkString(<span class="synConstant">" "</span>, <span class="synConstant">" | "</span>, <span class="synConstant">""</span>)) <span class="synComment">// Highlighter</span> fields.foreach { field => <span class="synType">val</span> text = hitDoc.get(field) <span class="synComment">// ハイライト対象のフィールドをDocumentから取得</span> <span class="synType">val</span> tokenStream = TokenSources.getAnyTokenStream(searcher.getIndexReader, h.doc, field, analyzer) <span class="synType">val</span> fragments = highlighter.getBestTextFragments(tokenStream, text, mergeContiguousFragments, maxNumFragments) fragments .withFilter(_.getScore > <span class="synConstant">0</span>) .foreach(f => println(s<span class="synConstant">" Fragment => $f"</span>)) } } } <span class="synStatement">else</span> { println(<span class="synConstant">"お探しの本はありませんでした"</span>) } } } implicit <span class="synType">class</span> AutoCloseableWrapper[A <: AutoCloseable](<span class="synType">val</span> underlying: A) <span class="synType">extends</span> AnyVal { <span class="synIdentifier"> def</span> foreach(fun: A => Unit): Unit = <span class="synStatement">try</span> { fun(underlying) } <span class="synStatement">finally</span> { underlying.close() } } } </pre> </div> <footer class="entry-footer"> <div class="entry-tags-wrapper"> <div class="entry-tags"> </div> </div> <p class="entry-footer-section track-inview-by-gtm" data-gtm-track-json="{"area": "finish_reading"}"> <span class="author vcard"><span class="fn" data-load-nickname="1" data-user-name="Kazuhira" >Kazuhira</span></span> <span class="entry-footer-time"><a href="https://kazuhira-r.hatenablog.com/entry/20131001/1380635740"><time data-relative datetime="2013-10-01T13:55:40Z" title="2013-10-01T13:55:40Z" class="updated">2013-10-01 22:55</time></a></span> <span class=" entry-footer-subscribe " data-test-blog-controlls-subscribe> <a href="https://blog.hatena.ne.jp/Kazuhira/kazuhira-r.hatenablog.com/subscribe?utm_medium=button&utm_source=blogs_entry_footer&utm_campaign=subscribe_blog"> 読者になる </a> </span> </p> <div class="hatena-star-container" 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