From 1688ec28c8bceb2419d8904117bd1ee10b28ef0b Mon Sep 17 00:00:00 2001
From: Mathijs de Bruin <mathijs@mathijsfietst.nl>
Date: Thu, 28 Dec 2017 17:08:12 +0000
Subject: [PATCH] Language detection.

---
 pom.xml                                       | 33 +++++++++++++++++++
 .../java/com/ipfssearch/ipfstika/App.java     | 15 ++++++---
 2 files changed, 43 insertions(+), 5 deletions(-)

diff --git a/pom.xml b/pom.xml
index f094eb6..a95f8b0 100644
--- a/pom.xml
+++ b/pom.xml
@@ -61,6 +61,12 @@
       <artifactId>tika-parsers</artifactId>
       <version>1.17</version>
     </dependency>
+    <!-- https://mvnrepository.com/artifact/org.apache.tika/tika-langdetect -->
+    <dependency>
+        <groupId>org.apache.tika</groupId>
+        <artifactId>tika-langdetect</artifactId>
+        <version>1.17</version>
+    </dependency>
     <!--  Gson: Java to Json conversion -->
     <dependency>
       <groupId>com.google.code.gson</groupId>
@@ -75,5 +81,32 @@
         <version>1.7.25</version>
         <scope>compile</scope>
     </dependency>
+    <!-- sqlite used by tika, somehow
+      https://mvnrepository.com/artifact/org.xerial/sqlite-jdbc
+    -->
+    <dependency>
+        <groupId>org.xerial</groupId>
+        <artifactId>sqlite-jdbc</artifactId>
+        <version>3.21.0.1</version>
+    </dependency>
+    <!-- optional dependencies -->
+    <dependency>
+        <groupId>com.levigo.jbig2</groupId>
+        <artifactId>levigo-jbig2-imageio</artifactId>
+        <version>2.0</version>
+        <scope>test</scope>
+    </dependency>
+    <dependency>
+        <groupId>com.github.jai-imageio</groupId>
+        <artifactId>jai-imageio-core</artifactId>
+        <version>1.3.1</version>
+        <scope>test</scope>
+    </dependency>
+    <dependency>
+        <groupId>com.github.jai-imageio</groupId>
+        <artifactId>jai-imageio-jpeg2000</artifactId>
+        <version>1.3.0</version>
+        <scope>test</scope>
+    </dependency>
   </dependencies>
 </project>
diff --git a/src/main/java/com/ipfssearch/ipfstika/App.java b/src/main/java/com/ipfssearch/ipfstika/App.java
index 4954771..3fdc712 100644
--- a/src/main/java/com/ipfssearch/ipfstika/App.java
+++ b/src/main/java/com/ipfssearch/ipfstika/App.java
@@ -20,6 +20,8 @@
 import org.apache.tika.sax.BodyContentHandler;
 import org.apache.tika.sax.LinkContentHandler;
 import org.apache.tika.language.detect.LanguageHandler;
+import org.apache.tika.language.detect.LanguageDetector;
+import org.apache.tika.langdetect.OptimaizeLangDetector;
 import org.apache.tika.sax.TeeContentHandler;
 import org.apache.tika.sax.Link;
 import org.apache.tika.exception.TikaException;
@@ -114,9 +116,11 @@ private String getResponse(String path) throws IOException {
         AutoDetectParser parser = new AutoDetectParser();
         LinkContentHandler link_handler = new LinkContentHandler();
         BodyContentHandler body_handler = new BodyContentHandler(10*1024*1024);
-        // This causes weird crashes
-        // LanguageHandler language_handler = new LanguageHandler();
-        TeeContentHandler handler = new TeeContentHandler(link_handler, body_handler);
+
+        LanguageDetector language_detector = new OptimaizeLangDetector().loadModels();
+        LanguageHandler language_handler = new LanguageHandler(language_detector);
+
+        TeeContentHandler handler = new TeeContentHandler(link_handler, body_handler, language_handler);
         Metadata metadata = new Metadata();
 
         // Set filename from path string
@@ -141,16 +145,17 @@ private String getResponse(String path) throws IOException {
 
         /* Now return JSON with:
             {
+                "metadata": metadata,
                 "language": language_handler.getLanguage(),
                 "content": body_handler.toString(),
-                "links": links,
-                "metadata": metadata
+                "urls": links,
             }
         */
         Gson gson = new Gson();
         JsonObject output_json = gson.toJsonTree(metadata).getAsJsonObject();
         output_json.add("content", gson.toJsonTree(body_handler.toString().trim()));
         output_json.add("urls", gson.toJsonTree(links));
+        output_json.add("language", gson.toJsonTree(language_handler.getLanguage()));
 
         return output_json.toString();
     }