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barthanssensbarthanssens
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2 parents 605b15f + 586bfd9 commit 4592605

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3 files changed

+99
-13
lines changed

‎config-example.json

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@@ -3,6 +3,12 @@
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"datasources": {
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"dbpedia": {
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"title": "DBPedia",
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"type": "HdtDatasource",
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"description": "DBPedia with an HDT back-end",
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"settings": { "file": "data/dbpedia.hdt" }
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},
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"swdf": {
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"title": "Semantic Web Dog Food",
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"type": "HdtDatasource",
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"description": "Semantic Web Dog Food with an HDT back-end",

‎pom.xml

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@@ -9,6 +9,66 @@
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<properties>
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<jettyVersion>9.3.6.v20151106</jettyVersion>
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</properties>
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<dependencies>
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<dependency>
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<groupId>org.rdfhdt</groupId>
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<artifactId>hdt-jena</artifactId>
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<version>1.1</version>
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</dependency>
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<dependency>
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<groupId>org.apache.jena</groupId>
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<artifactId>jena-core</artifactId>
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<version>2.13.0</version>
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</dependency>
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<dependency>
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<groupId>org.apache.jena</groupId>
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<artifactId>jena-arq</artifactId>
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<version>2.13.0</version>
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</dependency>
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<dependency>
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<groupId>org.apache.httpcomponents</groupId>
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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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<groupId>com.google.code.gson</groupId>
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<artifactId>gson</artifactId>
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<version>2.3</version>
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</dependency>
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<dependency>
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<groupId>javax.servlet</groupId>
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<artifactId>javax.servlet-api</artifactId>
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<version>3.1.0</version>
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<scope>compile</scope>
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</dependency>
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<dependency>
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<groupId>org.eclipse.jetty</groupId>
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<artifactId>jetty-server</artifactId>
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<version>${jettyVersion}</version>
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</dependency>
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<dependency>
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<groupId>org.eclipse.jetty</groupId>
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<artifactId>jetty-servlet</artifactId>
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<version>${jettyVersion}</version>
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</dependency>
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<dependency>
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<groupId>commons-cli</groupId>
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<artifactId>commons-cli</artifactId>
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<version>1.2</version>
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</dependency>
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<dependency>
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<groupId>org.apache.commons</groupId>
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<artifactId>commons-lang3</artifactId>
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<version>3.3.2</version>
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<type>jar</type>
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</dependency>
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<dependency>
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<groupId>commons-lang</groupId>
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<artifactId>commons-lang</artifactId>
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<version>2.6</version>
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<type>jar</type>
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</dependency>
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</dependencies>
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<build>
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<sourceDirectory>src</sourceDirectory>
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<plugins>
@@ -82,4 +142,4 @@
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<version>9.3.6.v20151106</version>
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</dependency>
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</dependencies>
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</project>
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</project>

‎src/org/linkeddatafragments/servlet/TriplePatternFragmentServlet.java

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Original file line numberDiff line numberDiff line change
@@ -1,31 +1,29 @@
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package org.linkeddatafragments.servlet;
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3-
import com.google.gson.JsonObject;
4-
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import java.io.File;
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import java.io.FileReader;
7-
import java.io.IOException;
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import java.net.URISyntaxException;
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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.regex.Matcher;
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import java.util.regex.Pattern;
13-
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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;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import org.apache.commons.codec.CharEncoding;
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import org.apache.http.HttpHeaders;
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import org.apache.http.client.utils.URIBuilder;
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23-
import org.linkeddatafragments.config.ConfigReader;
24-
import org.linkeddatafragments.datasource.TriplePatternFragment;
25-
import org.linkeddatafragments.datasource.IDataSource;
26-
import org.linkeddatafragments.datasource.DataSourceFactory;
27-
import org.linkeddatafragments.exceptions.DataSourceException;
28-
import org.linkeddatafragments.util.CommonResources;
22+
import org.apache.jena.riot.Lang;
23+
import org.apache.jena.riot.RDFDataMgr;
24+
import org.apache.jena.riot.RDFLanguages;
25+
26+
import com.google.gson.JsonObject;
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import com.hp.hpl.jena.datatypes.TypeMapper;
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import com.hp.hpl.jena.datatypes.xsd.XSDDatatype;
@@ -37,7 +35,13 @@
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import com.hp.hpl.jena.rdf.model.ResourceFactory;
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import com.hp.hpl.jena.shared.InvalidPropertyURIException;
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import org.apache.commons.codec.CharEncoding;
38+
import org.linkeddatafragments.config.ConfigReader;
39+
import org.linkeddatafragments.datasource.DataSourceFactory;
40+
import org.linkeddatafragments.datasource.IDataSource;
41+
import org.linkeddatafragments.exceptions.DataSourceException;
42+
import org.linkeddatafragments.util.CommonResources;
43+
44+
import org.linkeddatafragments.util.MIMEParse;
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/**
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* Servlet that responds with a Basic Linked Data Fragment.
@@ -63,6 +67,7 @@ public class TriplePatternFragmentServlet extends HttpServlet {
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private ConfigReader config;
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private final HashMap<String, IDataSource> dataSources = new HashMap<>();
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private final Collection<String> mimeTypes = new ArrayList<>();
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private File getConfigFile(ServletConfig config) throws IOException {
@@ -94,6 +99,11 @@ public void init(ServletConfig servletConfig) throws ServletException {
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for (Entry<String, JsonObject> dataSource : config.getDataSources().entrySet()) {
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dataSources.put(dataSource.getKey(), DataSourceFactory.create(dataSource.getValue()));
96101
}
102+
// register content types
103+
mimeTypes.add(Lang.TTL.getHeaderString());
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mimeTypes.add(Lang.JSONLD.getHeaderString());
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mimeTypes.add(Lang.NTRIPLES.getHeaderString());
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mimeTypes.add(Lang.RDFXML.getHeaderString() );
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} catch (IOException | DataSourceException e) {
98108
throw new ServletException(e);
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}
@@ -243,6 +253,16 @@ public void doGet(HttpServletRequest request, HttpServletResponse response) thro
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// fill the output model
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Model output = fragment.getTriples();
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output.setNsPrefixes(config.getPrefixes());
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// do conneg
258+
String bestMatch = MIMEParse.bestMatch(mimeTypes, request.getHeader("Accept"));
259+
Lang contentType = RDFLanguages.contentTypeToLang(bestMatch);
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261+
// serialize the output
262+
response.setHeader("Server", "Linked Data Fragments Server");
263+
response.setContentType(bestMatch);
264+
response.setCharacterEncoding("utf-8");
265+
RDFDataMgr.write(response.getOutputStream(), output, contentType);
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// add dataset metadata
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String datasetUrl = getDatasetUrl(request);

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