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Commit 586bfd9

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Miel Vander Sande
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Added conneg
1 parent e3ceeeb commit 586bfd9

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4 files changed

+58
-26
lines changed

4 files changed

+58
-26
lines changed

‎config-example.json

Lines changed: 6 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -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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@@ -19,12 +19,12 @@
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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>2.11.1</version>
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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>2.11.1</version>
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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>
@@ -57,6 +57,18 @@
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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>
@@ -65,8 +77,8 @@
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<artifactId>maven-compiler-plugin</artifactId>
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<version>3.1</version>
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<configuration>
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<source>1.7</source>
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<target>1.7</target>
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<source>1.8</source>
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<target>1.8</target>
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</configuration>
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</plugin>
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<plugin>

‎src/org/linkeddatafragments/servlet/TriplePatternFragmentServlet.java

Lines changed: 35 additions & 21 deletions
Original file line numberDiff line numberDiff line change
@@ -1,37 +1,40 @@
11
package org.linkeddatafragments.servlet;
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33
import com.google.gson.JsonObject;
4+
import com.hp.hpl.jena.datatypes.TypeMapper;
5+
import com.hp.hpl.jena.datatypes.xsd.XSDDatatype;
6+
import com.hp.hpl.jena.rdf.model.Literal;
7+
import com.hp.hpl.jena.rdf.model.Model;
8+
import com.hp.hpl.jena.rdf.model.Property;
9+
import com.hp.hpl.jena.rdf.model.RDFNode;
10+
import com.hp.hpl.jena.rdf.model.Resource;
11+
import com.hp.hpl.jena.rdf.model.ResourceFactory;
12+
import com.hp.hpl.jena.shared.InvalidPropertyURIException;
413
import java.io.File;
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import java.io.FileReader;
15+
import java.util.ArrayList;
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import java.util.Collection;
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import java.util.HashMap;
718
import java.util.Map.Entry;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
10-
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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;
16-
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import org.apache.http.client.utils.URIBuilder;
27+
import org.apache.jena.riot.Lang;
28+
import org.apache.jena.riot.RDFDataMgr;
29+
import org.apache.jena.riot.RDFLanguages;
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import org.linkeddatafragments.config.ConfigReader;
19-
import org.linkeddatafragments.datasource.TriplePatternFragment;
31+
import org.linkeddatafragments.datasource.DataSourceFactory;
2032
import org.linkeddatafragments.datasource.IDataSource;
21-
import org.linkeddatafragments.datasource.HdtDataSource;
33+
import org.linkeddatafragments.datasource.TriplePatternFragment;
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2335
import static org.linkeddatafragments.util.CommonResources.*;
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25-
import com.hp.hpl.jena.datatypes.TypeMapper;
26-
import com.hp.hpl.jena.datatypes.xsd.XSDDatatype;
27-
import com.hp.hpl.jena.rdf.model.Literal;
28-
import com.hp.hpl.jena.rdf.model.Model;
29-
import com.hp.hpl.jena.rdf.model.Property;
30-
import com.hp.hpl.jena.rdf.model.RDFNode;
31-
import com.hp.hpl.jena.rdf.model.Resource;
32-
import com.hp.hpl.jena.rdf.model.ResourceFactory;
33-
import com.hp.hpl.jena.shared.InvalidPropertyURIException;
34-
import org.linkeddatafragments.datasource.DataSourceFactory;
37+
import org.linkeddatafragments.util.MIMEParse;
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3639
/**
3740
* Servlet that responds with a Basic Linked Data Fragment.
@@ -46,7 +49,8 @@ public class TriplePatternFragmentServlet extends HttpServlet {
4649
private final static long TRIPLESPERPAGE = 100;
4750

4851
private ConfigReader config;
49-
private HashMap<String, IDataSource> dataSources = new HashMap<>();
52+
private final HashMap<String, IDataSource> dataSources = new HashMap<>();
53+
private final Collection<String> mimeTypes = new ArrayList<>();
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5155
@Override
5256
public void init(ServletConfig servletConfig) throws ServletException {
@@ -76,6 +80,12 @@ public void init(ServletConfig servletConfig) throws ServletException {
7680
for (Entry<String, JsonObject> dataSource : config.getDataSources().entrySet()) {
7781
dataSources.put(dataSource.getKey(), DataSourceFactory.create(dataSource.getValue()));
7882
}
83+
84+
// register content types
85+
mimeTypes.add(Lang.TTL.getHeaderString());
86+
mimeTypes.add(Lang.JSONLD.getHeaderString());
87+
mimeTypes.add(Lang.NTRIPLES.getHeaderString());
88+
mimeTypes.add(Lang.RDFXML.getHeaderString() );
7989
} catch (Exception e) {
8090
throw new ServletException(e);
8191
}
@@ -106,6 +116,16 @@ public void doGet(HttpServletRequest request, HttpServletResponse response) thro
106116
// fill the output model
107117
final Model output = fragment.getTriples();
108118
output.setNsPrefixes(config.getPrefixes());
119+
120+
// do conneg
121+
String bestMatch = MIMEParse.bestMatch(mimeTypes, request.getHeader("Accept"));
122+
Lang contentType = RDFLanguages.contentTypeToLang(bestMatch);
123+
124+
// serialize the output
125+
response.setHeader("Server", "Linked Data Fragments Server");
126+
response.setContentType(bestMatch);
127+
response.setCharacterEncoding("utf-8");
128+
RDFDataMgr.write(response.getOutputStream(), output, contentType);
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110130
// add dataset metadata
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final String hostName = request.getHeader("Host");
@@ -155,12 +175,6 @@ public void doGet(HttpServletRequest request, HttpServletResponse response) thro
155175
output.add(predicateMapping, HYDRA_PROPERTY, RDF_PREDICATE);
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output.add(objectMapping, HYDRA_VARIABLE, output.createLiteral("object"));
157177
output.add(objectMapping, HYDRA_PROPERTY, RDF_OBJECT);
158-
159-
// serialize the output as Turtle
160-
response.setHeader("Server", "Linked Data Fragments Server");
161-
response.setContentType("text/turtle");
162-
response.setCharacterEncoding("utf-8");
163-
output.write(response.getWriter(), "Turtle", fragmentUrl);
164178
} catch (Exception e) {
165179
throw new ServletException(e);
166180
}

‎src/org/linkeddatafragments/util/CommonResources.java

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -33,7 +33,7 @@ public class CommonResources {
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3434
public final static Property INVALID_URI = createProperty("urn:invalid");
3535

36-
private final static Property createProperty(String uri) {
36+
private static Property createProperty(String uri) {
3737
return ResourceFactory.createProperty(uri);
3838
}
3939
}

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