/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.clerezza.platform.language;
import java.io.IOException;
import java.net.URISyntaxException;
import java.net.URL;
import java.security.AccessControlException;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.List;
import java.util.concurrent.locks.Lock;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.core.MediaType;
import org.apache.clerezza.platform.Constants;
import org.apache.clerezza.platform.config.PlatformConfig;
import org.apache.clerezza.rdf.utils.GraphNode;
import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.Property;
import org.apache.felix.scr.annotations.Reference;
import org.apache.felix.scr.annotations.Service;
import org.osgi.service.component.ComponentContext;
import org.apache.clerezza.platform.language.ontologies.LANGUAGE;
import org.apache.clerezza.platform.typerendering.RenderletManager;
import org.apache.clerezza.platform.typerendering.UserContextProvider;
import org.apache.clerezza.platform.typerendering.scalaserverpages.ScalaServerPagesRenderlet;
import org.apache.clerezza.rdf.core.BNode;
import org.apache.clerezza.rdf.core.NonLiteral;
import org.apache.clerezza.rdf.core.TripleCollection;
import org.apache.clerezza.rdf.core.UriRef;
import org.apache.clerezza.rdf.core.access.LockableMGraph;
import org.apache.clerezza.rdf.core.access.TcManager;
import org.apache.clerezza.rdf.core.impl.TripleImpl;
import org.apache.clerezza.rdf.ontologies.PLATFORM;
import org.apache.clerezza.rdf.ontologies.RDF;
import org.apache.clerezza.rdf.utils.RdfList;
import org.apache.clerezza.rdf.utils.UnionMGraph;
import org.apache.clerezza.web.fileserver.BundlePathNode;
import org.apache.clerezza.web.fileserver.FileServer;
import org.apache.felix.scr.annotations.Services;
import org.osgi.framework.Bundle;
import org.wymiwyg.commons.util.dirbrowser.PathNode;
/**
* Use the LanguageWidget service to store an RDF list of
* languages in a triple collection and retrieve the root node of the list. The widget
* can be rendered by using the render method. Via javascript function
* LanguageList.getLanguage() the currently selected language can be retrieved.
*
* @author tio
*/
@Component(enabled=true, immediate=true)
@Services({
@Service(Object.class),
@Service(UserContextProvider.class)
})
@Property(name = "javax.ws.rs", boolValue = true)
@Path("/language-widget")
public class LanguageWidget implements UserContextProvider {
private FileServer fileServer;
@Reference
private TcManager tcManager;
@Reference
private PlatformConfig platformConfig;
@Reference
private RenderletManager renderletManager;
@Reference
private LanguageService languageService;
protected void activate(ComponentContext context) throws IOException, URISyntaxException {
Bundle bundle = context.getBundleContext().getBundle();
URL resourceDir = getClass().getResource("staticweb");
PathNode pathNode = new BundlePathNode(bundle, resourceDir.getPath());
fileServer = new FileServer(pathNode);
URL template = getClass().getResource("language-list.ssp");
renderletManager.registerRenderlet(ScalaServerPagesRenderlet.class.getName(),
new UriRef(template.toURI().toString()),
LANGUAGE.LanguageList, "naked",
MediaType.APPLICATION_XHTML_XML_TYPE, true);
}
private LockableMGraph getConfigGraph() {
return tcManager.getMGraph(Constants.CONFIG_GRAPH_URI);
}
/**
*
* @param node The graph of the specified GraphNode will not be locked, neither for reading nor writing.
* It is the responsibility of the calling function to set the write lock, if necessary.
* @return
*/
@Override
public GraphNode addUserContext(final GraphNode node) {
final NonLiteral platformInstance = AccessController.doPrivileged(
new PrivilegedAction<NonLiteral>() {
@Override
public NonLiteral run() {
return (NonLiteral) platformConfig.getPlatformInstance().getNode();
}
});
try {
return addLanguages(node, platformInstance, languageService.getLanguages(), false);
} catch (AccessControlException ex) {
return AccessController.doPrivileged(
new PrivilegedAction<GraphNode>() {
@Override
public GraphNode run() {
return addLanguages(node, platformInstance, languageService.getLanguages(), true);
}
});
}
}
private GraphNode addLanguages(GraphNode node, NonLiteral platformInstance, List<LanguageDescription> languages,
boolean copyToNode) {
TripleCollection graph = node.getGraph();
BNode listNode = new BNode();
RdfList list = new RdfList(listNode, graph);
LockableMGraph configGraph = getConfigGraph();
Lock readLock = configGraph.getLock().readLock();
for (LanguageDescription languageDescription : languages) {
NonLiteral languageUri = (NonLiteral) languageDescription.getResource().getNode();
list.add(languageUri);
if (copyToNode) {
readLock.lock();
try {
graph.addAll(new GraphNode(languageUri, configGraph).getNodeContext());
} finally {
readLock.unlock();
}
}
}
node.addProperty(PLATFORM.instance, platformInstance);
graph.add(new TripleImpl(platformInstance, RDF.type, PLATFORM.Instance));
graph.add(new TripleImpl(platformInstance, PLATFORM.languages, listNode));
graph.add(new TripleImpl(listNode, RDF.type, LANGUAGE.LanguageList));
if (!copyToNode) {
node = new GraphNode(node.getNode(), new UnionMGraph(graph, configGraph));
}
return node;
}
/**
* Returns a PathNode of a static file from the staticweb folder.
*
* @param path specifies the path param of a URI
*
* @return {@link PathNode}
*/
@GET
@Path("{path:.+}")
public PathNode getStaticFile(@PathParam("path") String path) {
return fileServer.getNode(path);
}
}