/*
* 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.concepts.core;
import javax.ws.rs.FormParam;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.Response.Status;
import org.apache.clerezza.platform.config.PlatformConfig;
import org.apache.clerezza.platform.graphprovider.content.ContentGraphProvider;
import org.apache.clerezza.rdf.core.Language;
import org.apache.clerezza.rdf.core.MGraph;
import org.apache.clerezza.rdf.core.PlainLiteral;
import org.apache.clerezza.rdf.core.UriRef;
import org.apache.clerezza.rdf.core.impl.PlainLiteralImpl;
import org.apache.clerezza.rdf.core.impl.TripleImpl;
import org.apache.clerezza.rdf.ontologies.RDF;
import org.apache.clerezza.rdf.ontologies.RDFS;
import org.apache.clerezza.rdf.ontologies.SKOS;
import org.apache.clerezza.rdf.utils.UriRefUtil;
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;
/**
* This JAX-RS resource can be used to add free concepts to the content graph.
* The URI path of this resource is /concepts/manipulator.
*
* @author hasan
*/
@Component
@Service(Object.class)
@Property(name = "javax.ws.rs", boolValue = true)
@Path("/concepts/manipulator")
public class ConceptManipulator {
public static String FREE_CONCEPT_SCHEME = "concept-scheme/free-concepts";
@Reference
protected ContentGraphProvider cgProvider;
@Reference
private PlatformConfig platformConfig;
/**
* Creates and stores a concept with the specified prefLabel and comment
* into the content graph if a concept with this prefLabel does not already
* exist in the graph.
*
* @param prefLabel
* if it is an empty string no concept is generated
* @param lang
* the language of the prefLabel
* @param comment
* is a human-readable description of the concept
* @return
* - BAD REQUEST response if prefLabel is undefined or empty
* - CONFLICT response if a concept with the same prefLabel and lang exists
* - CREATED if everything is ok
*/
@POST
@Path("add-concept")
public Response addConcept(@FormParam("pref-label") String prefLabel,
@FormParam("lang") String lang,
@FormParam("comment") String comment) {
if ((prefLabel == null) || (prefLabel.isEmpty())) {
return Response.status(Status.BAD_REQUEST)
.entity("A concept must have a label!")
.build();
}
MGraph contentGraph = cgProvider.getContentGraph();
PlainLiteral preferredLabel = new PlainLiteralImpl(prefLabel,
new Language(lang));
if (contentGraph.filter(null, SKOS.prefLabel, preferredLabel).hasNext()) {
return Response.status(Status.CONFLICT)
.entity("A concept with the same label and language already exists!")
.build();
}
UriRef concept = getConceptUriRef(platformConfig, prefLabel);
contentGraph.add(new TripleImpl(concept, RDF.type,
SKOS.Concept));
String baseUri = platformConfig.getDefaultBaseUri().getUnicodeString();
contentGraph.add(new TripleImpl(concept, SKOS.inScheme,
new UriRef(baseUri + FREE_CONCEPT_SCHEME)));
contentGraph.add(new TripleImpl(concept, SKOS.prefLabel, preferredLabel));
if (!comment.isEmpty()) {
contentGraph.add(new TripleImpl(concept, RDFS.comment,
new PlainLiteralImpl(comment, new Language(lang))));
}
return Response.status(Status.CREATED).entity(concept.getUnicodeString())
.build();
}
static UriRef getConceptUriRef(PlatformConfig platformConfig, String prefLabel) {
String baseUri = platformConfig.getDefaultBaseUri().getUnicodeString();
return new UriRef(baseUri + "concept/" +
UriRefUtil.stripNonUriRefChars(prefLabel));
}
}