content: /*
   *  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.
   *
   *  See the NOTICE file distributed with this work for additional
   *  information regarding copyright ownership.
   */
  
  package org.seaborne.delta.examples;
  
  import java.io.OutputStream;
  
  import org.apache.jena.query.Dataset;
  import org.apache.jena.query.DatasetFactory;
  import org.apache.jena.riot.RDFDataMgr;
  import org.apache.jena.sparql.core.DatasetGraph;
  import org.apache.jena.sparql.core.DatasetGraphFactory;
  import org.apache.jena.system.Txn;
  import org.seaborne.delta.lib.LogX;
  import org.apache.jena.rdfpatch.RDFPatchOps;
  import org.apache.jena.rdfpatch.text.RDFChangesWriterText;
  
  /**
   * Set up a dataset and write out a log of changes as they happen.
   * <p>
   * This shows a live stream of changes.
   * <p>
   * See {@link DeltaEx02_DatasetCollectPatch} for a similar example but
   * collecting the patch before writing it.
   */
  public class DeltaEx01_DatasetWithPatchLog {
      static { LogX.setJavaLogging(); }
  
  
      public static void main(String ...args) {
          // -- Base dataset
          DatasetGraph dsgBase = DatasetGraphFactory.createTxnMem();
  
          // -- Destination for changes.
          // Text form of output.
          OutputStream out = System.out;
          // Create an RDFChanges that writes to "out".
          try ( RDFChangesWriterText changeLog = RDFPatchOps.textWriter(out) ) {
  
              // Combined DatasetGraph and changes.
              DatasetGraph dsg = RDFPatchOps.changes(dsgBase, changeLog);
  
              // Wrap in the Dataset API
              Dataset ds = DatasetFactory.wrap(dsg);
  
              // --------
              // Do something. Read in data.ttl inside a transaction.
              // (data.ttl is in src/main/resources/)
              Txn.executeWrite(ds,
                  ()->RDFDataMgr.read(dsg, "data.ttl")
                  );
          }
      }
  }
  