用Java将形状文件转换为RDF文档

Question

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.URI;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import javax.management.AttributeChangeNotification;
import org.apache.jena.datatypes.xsd.XSDDatatype;
import org.apache.jena.rdf.model.Model;
import org.apache.jena.rdf.model.ModelFactory;
import org.apache.jena.rdf.model.Property;
import org.apache.jena.rdf.model.RDFNode;
import org.apache.jena.rdf.model.RDFReaderI;
import org.apache.jena.rdf.model.Resource;
import org.apache.jena.rdf.model.Statement;
import org.apache.jena.rdf.model.StmtIterator;
import org.apache.jena.riot.Lang;
import org.apache.jena.riot.RDFDataMgr;
import org.apache.jena.riot.system.StreamRDFWriter;
import org.apache.jena.vocabulary.VCARD;
import org.geotools.data.DataStore;
import org.geotools.data.DataStoreFinder;
import org.geotools.data.DataUtilities;
import org.geotools.data.FeatureSource;
import org.geotools.data.FileDataStore;
import org.geotools.data.FileDataStoreFinder;
import org.geotools.data.Query;
import org.geotools.data.ServiceInfo;
import org.geotools.data.shapefile.ShapefileDataStore;
import org.geotools.data.simple.SimpleFeatureCollection;
import org.geotools.data.simple.SimpleFeatureIterator;
import org.geotools.data.simple.SimpleFeatureSource;
import org.geotools.feature.FeatureCollection;
import org.geotools.feature.FeatureIterator;
import org.geotools.swing.data.JFileDataStoreChooser;
import org.opengis.feature.ComplexAttribute;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;
import org.opengis.feature.type.FeatureType;
import org.opengis.filter.Filter;
public class ShpToRdf {
public static void main(String[] args) throws IOException {

ArrayList<String> names = new ArrayList<String>();
ArrayList<String> values = new ArrayList<String>();
File file = JFileDataStoreChooser.showOpenFile("shp", null);
if (file == null) {
return;

}
FileDataStore myData = FileDataStoreFinder.getDataStore(file);
SimpleFeatureSource source = myData.getFeatureSource();
SimpleFeatureType schema = source.getSchema();
Query query = new Query(schema.getTypeName());
query.setMaxFeatures(100);

Model model = ModelFactory.createDefaultModel();
String shpURI = "http://www.shp.fake/";
Resource shapeFile = model.createResource(shpURI);

FeatureCollection<SimpleFeatureType, SimpleFeature> collection = source.getFeatures(query);
try (FeatureIterator<SimpleFeature> features = collection.features()) {
while (features.hasNext()) {

SimpleFeature feature = features.next();
model.setNsPrefix("shp", shpURI);

for (org.opengis.feature.Property attribute : feature.getProperties()) {
names.add(attribute.getName().toString());
values.add(attribute.getValue().toString());

}   
}  
}

ArrayList<Integer> ids = new ArrayList<Integer>();
for(int i=0; i<names.size();i++) {
if (names.get(i).equals("Id")) {
ids.add(i); 
}
}  
Property features = model.createProperty(shpURI,"features");
for(int i = 0; i<ids.size();i++) {
Property id = model.createProperty(shpURI,names.get(ids.get(i)));

shapeFile = model.createResource(shpURI)
.addProperty(features, model.createResource()
.addProperty(id,model.createResource()
.addProperty(id, values.get(ids.get(i)))
.addProperty(features, "feature1")
.addProperty(features, "feature2")
.addProperty(features, "feature3")));
}
RDFDataMgr.write(System.out, model, Lang.RDFXML);
} 



}

我正在尝试创建一个将Shape File(shp(转换为RDF的应用程序。问题是我可以从shp获得两个ArrayList。其中一个具有值的名称(id、名称、几何体等(，另一个则具有值。

为了创建RDF，我必须将每个Id与匹配的值进行匹配(例如，Id＝1具有name＝road 1、geometry＝line等(

你能帮我做这个吗？

谢谢！

Answer 1

我认为您应该能够通过调整以下逻辑来做到这一点

for (org.opengis.feature.Property attribute : feature.getProperties()) {
names.add(attribute.getName().toString());
values.add(attribute.getValue().toString());
}

你可以把它们放在一个成对的列表中，而不是放在两个列表中。这样，当您对列表进行迭代时，您就知道了主题和对象之间的映射。

它应该看起来像

List<Pair<String, Integer>> contentList = new ArrayList<Pair<String, String>>();
for (org.opengis.feature.Property attribute : feature.getProperties()) {
Pair<String, Integer> subjectObjectPairs = new Pair<String, String>(attribute.getName().toString(), attribute.getValue().toString());
contentList.add(subjectObjectPairs);
}

我不确定idsArrayList是用来做什么的，但您可以将该逻辑移动到上面的for循环中，以确保仅获取标识符。