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Commit 19dfaf9

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Miel Vander Sande
committed
Added HTML writer with Freemarker
1 parent f9d50e3 commit 19dfaf9

7 files changed

Lines changed: 164 additions & 13 deletions

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‎pom.xml‎

Lines changed: 6 additions & 1 deletion
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@@ -30,7 +30,7 @@
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<artifactId>httpclient</artifactId>
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<version>4.3.5</version>
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</dependency>
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<dependency>
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<dependency>
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<groupId>com.google.code.gson</groupId>
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<artifactId>gson</artifactId>
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<version>2.5</version>
@@ -73,6 +73,11 @@
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<artifactId>jena-tdb</artifactId>
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<version>1.1.2</version>
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</dependency>
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<dependency>
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<groupId>org.freemarker</groupId>
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<artifactId>freemarker</artifactId>
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<version>2.3.23</version>
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</dependency>
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</dependencies>
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<build>
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<sourceDirectory>src</sourceDirectory>

‎src/org/linkeddatafragments/exceptions/NoRegisteredMimeTypesException.java‎

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package org.linkeddatafragments.exceptions;
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/**
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*
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* @author mielvandersande
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*/
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public class NoRegisteredMimeTypesException extends Exception {
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public NoRegisteredMimeTypesException() {
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super("List of supported mimeTypes is empty.");
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}
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}

‎src/org/linkeddatafragments/servlet/TriplePatternFragmentServlet.java‎

Lines changed: 25 additions & 10 deletions
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@@ -3,13 +3,20 @@
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import com.google.gson.JsonObject;
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import com.hp.hpl.jena.rdf.model.Model;
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import com.hp.hpl.jena.rdf.model.ModelFactory;
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import com.hp.hpl.jena.rdf.model.Statement;
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import com.hp.hpl.jena.rdf.model.StmtIterator;
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import freemarker.template.TemplateException;
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import java.io.File;
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import java.io.FileReader;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.HashMap;
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import java.util.Map.Entry;
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import java.util.function.Consumer;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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import javax.servlet.RequestDispatcher;
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import javax.servlet.ServletConfig;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServlet;
@@ -33,6 +40,7 @@
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import org.linkeddatafragments.fragments.LinkedDataFragmentRequestBase;
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import org.linkeddatafragments.fragments.tpf.TriplePatternFragmentRequestImpl;
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import org.linkeddatafragments.util.MIMEParse;
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import org.linkeddatafragments.views.HtmlWriter;
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/**
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* Servlet that responds with a Linked Data Fragment.
@@ -88,6 +96,7 @@ public void init(ServletConfig servletConfig) throws ServletException {
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}
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// register content types
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MIMEParse.register("text/html");
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MIMEParse.register(Lang.TTL.getHeaderString());
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MIMEParse.register(Lang.JSONLD.getHeaderString());
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MIMEParse.register(Lang.NTRIPLES.getHeaderString());
@@ -145,24 +154,30 @@ public void doGet(HttpServletRequest request, HttpServletResponse response) thro
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final LinkedDataFragmentRequest ldfRequest = new TriplePatternFragmentRequestImpl( request, config );
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final IFragmentRequestProcessor processor = dataSource.getRequestProcessor( ldfRequest );
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final LinkedDataFragment fragment = processor.createRequestedFragment();
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final Model output = ModelFactory.createDefaultModel();
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output.setNsPrefixes(config.getPrefixes());
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output.add( fragment.getMetadata() );
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output.add( fragment.getTriples() );
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output.add( fragment.getControls() );
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// do conneg
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String bestMatch = MIMEParse.bestMatch(request.getHeader("Accept"));
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Lang contentType = RDFLanguages.contentTypeToLang(bestMatch);
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// serialize the output
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response.setHeader("Server", "Linked Data Fragments Server");
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response.setContentType(bestMatch);
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response.setCharacterEncoding("utf-8");
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if (bestMatch.equals("text/html")) {
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new HtmlWriter().write(response.getOutputStream(), dataSources, dataSource, fragment);
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return;
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}
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final Model output = ModelFactory.createDefaultModel();
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output.setNsPrefixes(config.getPrefixes());
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output.add( fragment.getMetadata() );
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output.add( fragment.getTriples() );
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output.add( fragment.getControls() );
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Lang contentType = RDFLanguages.contentTypeToLang(bestMatch);
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RDFDataMgr.write(response.getOutputStream(), output, contentType);
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RDFDataMgr.write(response.getOutputStream(), output, contentType);
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} catch (IOException | NoRegisteredMimeTypesException e) {
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} catch (IOException | NoRegisteredMimeTypesException | TemplateException e) {
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throw new ServletException(e);
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} catch (DataSourceNotFoundException ex) {
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try {

‎src/org/linkeddatafragments/standalone/JettyServer.java‎

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@@ -5,11 +5,11 @@
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import org.apache.commons.cli.DefaultParser;
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import org.apache.commons.cli.HelpFormatter;
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import org.apache.commons.cli.Options;
8-
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import org.eclipse.jetty.server.Server;
9+
import org.eclipse.jetty.servlet.DefaultServlet;
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import org.eclipse.jetty.servlet.ServletContextHandler;
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import org.eclipse.jetty.servlet.ServletHandler;
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import org.eclipse.jetty.servlet.ServletHolder;
12-
1313
import org.linkeddatafragments.servlet.TriplePatternFragmentServlet;
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1515
/**
@@ -67,6 +67,15 @@ public static void main(String[] args) throws Exception {
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ServletHolder tpfServletHolder = new ServletHolder(new TriplePatternFragmentServlet());
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tpfServletHolder.setInitParameter(TriplePatternFragmentServlet.CFGFILE, config);
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handler.addServletWithMapping(tpfServletHolder, "/*");
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// TODO: create a servlet to serve assets
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//String assetsPath = System.getProperty("user.dir") + "/assets";
73+
//ServletHolder assetsHolder = new ServletHolder(new DefaultServlet());
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//assetsHolder.setInitParameter("resourceBase", assetsPath);
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//assetsHolder.setInitParameter("dirAllowed","true");
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//assetsHolder.setInitParameter("pathInfoOnly","true");
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//handler.addServletWithMapping(assetsHolder,"/assets/*");
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// start the server
7281
server.start();

‎src/org/linkeddatafragments/views/HtmlWriter.java‎

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/*
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* To change this license header, choose License Headers in Project Properties.
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* To change this template file, choose Tools | Templates
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* and open the template in the editor.
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*/
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package org.linkeddatafragments.views;
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import freemarker.template.Configuration;
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import freemarker.template.Template;
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import freemarker.template.TemplateException;
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import freemarker.template.TemplateExceptionHandler;
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import java.io.File;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.io.OutputStreamWriter;
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import java.io.Writer;
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import java.util.HashMap;
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import java.util.Map;
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import org.linkeddatafragments.datasource.IDataSource;
21+
import org.linkeddatafragments.fragments.LinkedDataFragment;
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/**
24+
*
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* @author mielvandersande
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*/
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public class HtmlWriter {
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private final Configuration cfg;
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30+
public HtmlWriter() throws IOException {
31+
cfg = new Configuration(Configuration.VERSION_2_3_22);
32+
cfg.setDirectoryForTemplateLoading(new File(System.getProperty("user.dir") + "/views"));
33+
cfg.setDefaultEncoding("UTF-8");
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cfg.setTemplateExceptionHandler(TemplateExceptionHandler.RETHROW_HANDLER);
35+
}
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37+
public void write(OutputStream outputStream, HashMap<String, IDataSource> dataSources, IDataSource datasource, LinkedDataFragment fragment) throws IOException, TemplateException{
38+
/* Get the template (uses cache internally) */
39+
Template temp = cfg.getTemplate("index.ftl.html");
40+
41+
Map data = new HashMap();
42+
data.put("assetsPath", "css/");
43+
data.put("header", datasource.getTitle());
44+
data.put("datasources", dataSources);
45+
data.put("content", "");
46+
47+
data.put("controls", fragment.getControls());
48+
data.put("metadata", fragment.getMetadata());
49+
data.put("triples", fragment.getTriples());
50+
51+
52+
/* Merge data-model with template */
53+
Writer out = new OutputStreamWriter(outputStream);
54+
temp.process(data, out);
55+
}
56+
}

‎views/base.ftl.html‎

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<#-- @license ©2015 Miel Vander Sande - Multimedia Lab / iMinds / Ghent University -->
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<!DOCTYPE html>
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<html lang="en" prefix="hydra: http://www.w3.org/ns/hydra/core# void: http://rdfs.org/ns/void#">
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<head>
5+
<meta charset="utf-8">
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<title>
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<#attempt>
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${ title || header }
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<#recover>
10+
'Linked Data Fragments Server'
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</#attempt>
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</title>
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<link rel="stylesheet" href="${ assetsPath }style" />
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<link rel="stylesheet" href="//fonts.googleapis.com/css?family=Open+Sans:700italic,400,700|Droid+Sans+Mono" type="text/css" />
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<meta name="viewport" content="width=device-width,minimum-scale=1,maximum-scale=1">
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</head>
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<body>
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<header>
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<h1><a href="/">
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<#attempt>
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${ header }
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<#recover>
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'Linked Data Fragments Server'
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</#attempt>
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</a></h1>
26+
<figure class="logo">
27+
<a href="http://linkeddatafragments.org/"><img src="/logo" alt="Linked Data Fragments" /></a>
28+
</figure>
29+
</header>
30+
<main>
31+
${ content }
32+
</main>
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<footer>
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<p>
35+
Powered by a <a href="https://github.com/LinkedDataFragments/Server.java" target="_blank">Linked Data Fragments Server</a>
36+
©2013–2015 Multimedia Lab – iMinds – Ghent University
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</p>
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</footer>
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</body>
40+
</html>

‎views/index.ftl.html‎

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<#-- @license ©2015 Miel Vander Sande - Multimedia Lab / iMinds / Ghent University -->
2+
<#include "base.ftl.html">
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<div class="index">
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<h2>Available datasets</h2>
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<p>Browse the following datasets as <a href="http://linkeddatafragments.org/in-depth/#tpf">Triple Pattern Fragments</a>:</p>
6+
<dl class="datasets">
7+
<#list datasources?keys as datasourceName>
8+
<dt><a href="/${datasourceName}">${datasources[datasourceName].getTitle() }</a></dt>
9+
<dd>${ datasources[datasourceName].getDescription() }</dd>
10+
</#list>
11+
</dl>
12+
<p>The current dataset <em class="dataset">index</em> contains metadata about these datasets.</p>
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</div>

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