| /* |
| * Copyright 2015 The Apache Software Foundation. |
| * |
| * Licensed 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.commons.rdf.impl.sparql; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Map; |
| import org.apache.http.HttpEntity; |
| import org.apache.http.NameValuePair; |
| import org.apache.http.client.entity.UrlEncodedFormEntity; |
| import org.apache.http.client.methods.CloseableHttpResponse; |
| import org.apache.http.client.methods.HttpPost; |
| import org.apache.http.impl.client.CloseableHttpClient; |
| import org.apache.http.impl.client.HttpClients; |
| import org.apache.http.message.BasicNameValuePair; |
| import org.apache.http.util.EntityUtils; |
| import org.apache.clerezza.commons.rdf.RDFTerm; |
| import org.apache.clerezza.rdf.core.serializedform.Parser; |
| |
| /** |
| * |
| * @author developer |
| */ |
| public class SparqlClient { |
| |
| final String endpoint; |
| |
| public SparqlClient(final String endpoint) { |
| this.endpoint = endpoint; |
| } |
| |
| public List<Map<String, RDFTerm>> queryResultSet(final String query) throws IOException { |
| return (List<Map<String, RDFTerm>>) queryResult(query); |
| } |
| |
| public Object queryResult(final String query) throws IOException { |
| CloseableHttpClient httpclient = HttpClients.createDefault(); |
| HttpPost httpPost = new HttpPost(endpoint); |
| List<NameValuePair> nvps = new ArrayList<NameValuePair>(); |
| nvps.add(new BasicNameValuePair("query", query)); |
| httpPost.setEntity(new UrlEncodedFormEntity(nvps)); |
| CloseableHttpResponse response2 = httpclient.execute(httpPost); |
| HttpEntity entity2 = response2.getEntity(); |
| try { |
| InputStream in = entity2.getContent(); |
| final String mediaType = entity2.getContentType().getValue(); |
| if (mediaType.startsWith("application/sparql-results+xml")) { |
| return SparqlResultParser.parse(in); |
| } else { |
| //assuming RDF response |
| //FIXME clerezza-core-rdf to clerezza dependency |
| Parser parser = Parser.getInstance(); |
| return parser.parse(in, mediaType); |
| } |
| } finally { |
| EntityUtils.consume(entity2); |
| response2.close(); |
| } |
| |
| } |
| |
| |
| |
| } |