| /* |
| * 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.rdf.rdfjson.parser; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.InputStreamReader; |
| import java.io.UnsupportedEncodingException; |
| import java.util.HashMap; |
| import java.util.Map; |
| import org.json.simple.JSONArray; |
| import org.json.simple.JSONObject; |
| import org.json.simple.parser.JSONParser; |
| import org.json.simple.parser.ParseException; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| import org.apache.clerezza.rdf.core.BNode; |
| import org.apache.clerezza.rdf.core.Language; |
| import org.apache.clerezza.rdf.core.MGraph; |
| import org.apache.clerezza.rdf.core.NonLiteral; |
| 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.core.impl.TypedLiteralImpl; |
| import org.apache.clerezza.rdf.core.serializedform.ParsingProvider; |
| import org.apache.clerezza.rdf.core.serializedform.SupportedFormat; |
| import org.apache.felix.scr.annotations.Component; |
| import org.apache.felix.scr.annotations.Service; |
| |
| /** |
| * A {@link org.apache.clerezza.rdf.core.serializedform.ParsingProvider} for rdf/json |
| * |
| * @author tio, hasan |
| * |
| */ |
| @Component(immediate=true) |
| @Service(ParsingProvider.class) |
| @SupportedFormat(SupportedFormat.RDF_JSON) |
| public class RdfJsonParsingProvider implements ParsingProvider { |
| |
| private final Logger logger = LoggerFactory.getLogger(getClass()); |
| |
| @Override |
| public void parse(MGraph target, InputStream serializedGraph, String formatIdentifier, UriRef baseUri) { |
| |
| BNodeManager bNodeMgr = new BNodeManager(); |
| |
| JSONParser parser = new JSONParser(); |
| InputStreamReader reader; |
| try { |
| reader = new InputStreamReader(serializedGraph, "UTF-8"); |
| } catch (UnsupportedEncodingException e) { |
| String msg = "Encoding 'UTF-8' is not supported by this System"; |
| logger.error("{} (message: {})", msg, e.getMessage()); |
| throw new IllegalStateException(msg, e); |
| } |
| |
| try { |
| JSONObject root = (JSONObject) parser.parse(reader); |
| |
| NonLiteral nonLiteral = null; |
| for (Object key : root.keySet()) { |
| String keyString = (String) key; |
| if (keyString.startsWith("_:")) { |
| nonLiteral = bNodeMgr.getBNode(keyString); |
| } else { |
| nonLiteral = new UriRef(keyString); |
| } |
| JSONObject predicates = (JSONObject) root.get(keyString); |
| addTriplesToGraph(nonLiteral, bNodeMgr, predicates, target); |
| } |
| } catch (IOException ioe) { |
| logger.error(ioe.getMessage()); |
| throw new RuntimeException(ioe.getMessage()); |
| } catch (ParseException pe) { |
| logger.error(pe.getMessage()); |
| throw new RuntimeException(pe.getMessage()); |
| } |
| } |
| |
| private class BNodeManager { |
| private Map<String, BNode> bNodeMap = new HashMap<String, BNode>(); |
| |
| public BNode getBNode(String id) { |
| BNode bNode = bNodeMap.get(id); |
| if (bNode == null) { |
| bNode = new BNode(); |
| bNodeMap.put(id, bNode); |
| } |
| return bNode; |
| } |
| } |
| |
| private void addTriplesToGraph(NonLiteral subject, BNodeManager bNodeMgr, JSONObject predicates, MGraph mGraph) { |
| for (Object predicate : predicates.keySet()) { |
| JSONArray objects = (JSONArray) predicates.get(predicate); |
| for (Object object : objects) { |
| JSONObject values = (JSONObject) object; |
| String value = (String) values.get("value"); |
| if (values.get("type").equals("literal")) { |
| Object dataType = values.get("datatype"); |
| if (dataType != null && |
| !dataType.toString().isEmpty()) { |
| mGraph.add(new TripleImpl(subject, new UriRef((String) predicate), |
| //LiteralFactory.getInstance().createTypedLiteral(value))); |
| new TypedLiteralImpl(value.toString(),new UriRef(dataType.toString())))); |
| } else if (values.containsKey("lang") |
| && !values.get("lang").equals("") |
| && values.get("lang") != null) { |
| mGraph.add(new TripleImpl(subject, new UriRef((String) predicate), |
| new PlainLiteralImpl(value, new Language((String) values.get("lang"))))); |
| } else { |
| mGraph.add(new TripleImpl(subject, new UriRef((String) predicate), new PlainLiteralImpl(value))); |
| } |
| } else if (values.get("type").equals("uri")) { |
| mGraph.add(new TripleImpl(subject, new UriRef((String) predicate), new UriRef(value))); |
| } else if (values.get("type").equals("bnode")) { |
| NonLiteral bNode = bNodeMgr.getBNode(value); |
| mGraph.add(new TripleImpl(subject, new UriRef((String) predicate), bNode)); |
| } |
| } |
| } |
| } |
| } |