/*
* 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 arq.examples.update;
import org.apache.jena.atlas.lib.StrUtils ;
import org.apache.jena.riot.RiotWriter ;
import com.hp.hpl.jena.sparql.sse.SSE ;
import com.hp.hpl.jena.update.GraphStore ;
import com.hp.hpl.jena.update.GraphStoreFactory ;
import com.hp.hpl.jena.update.UpdateAction ;
import com.hp.hpl.jena.update.UpdateFactory ;
import com.hp.hpl.jena.update.UpdateRequest ;
/** Build an update request up out of indvidiual Updates specified as strings.
* See UpdatePorgrammatic for another way to build up a request.
* These two approaches can be mixed.
*/
public class UpdateExecuteOperations
{
public static void main(String []args)
{
// Create an empty GraphStore (has an empty default graph and no named graphs)
GraphStore graphStore = GraphStoreFactory.create() ;
ex1(graphStore) ;
ex2(graphStore) ;
ex3(graphStore) ;
}
public static void ex1(GraphStore graphStore)
{
// Execute one operation.
UpdateAction.parseExecute("LOAD <file:etc/update-data.ttl>", graphStore) ;
}
public static void ex2(GraphStore graphStore)
{
// Execute a series of operations at once.
// See ex3 for a better way to build up a request
// For maximum portability, multiple operations should be separated by a ";".
// The "\n" imporves readability and parser error messages.
String cmd = StrUtils.strjoin(" ;\n",
"DROP ALL",
"CREATE GRAPH <http://example/g2>",
"LOAD <file:etc/update-data.ttl> INTO <http://example/g2>") ;
// check string created
System.out.println(cmd) ;
UpdateAction.parseExecute(cmd, graphStore) ;
}
public static void ex3(GraphStore graphStore)
{
// Build up the request then execute it.
// This is the preferred way for complex sequences of operations.
UpdateRequest request = UpdateFactory.create() ;
request.add("DROP ALL")
.add("CREATE GRAPH <http://example/g2>") ;
// Different style.
// Equivalent to request.add("...")
UpdateFactory.parse(request, "LOAD <file:etc/update-data.ttl> INTO <http://example/g2>") ;
// And perform the operations.
UpdateAction.execute(request, graphStore) ;
System.out.println("# Debug format");
SSE.write(graphStore) ;
System.out.println();
System.out.println("# N-Quads: S P O G") ;
RiotWriter.writeNQuads(System.out, graphStore) ;
}
}