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;
  
  import java.io.OutputStream ;
  
  import org.apache.jena.rdfpatch.RDFChanges;
  import org.apache.jena.rdfpatch.changes.RDFChangesLog ;
  import org.apache.jena.rdfpatch.changes.RDFChangesN ;
  import org.apache.jena.rdfpatch.system.Printer ;
  import org.apache.jena.rdfpatch.text.TokenWriter ;
  import org.apache.jena.rdfpatch.text.TokenWriterText ;
  import org.slf4j.Logger ;
  
  public class DeltaOps {
  
      public static void printer(String fmt, Object... args) {
          System.out.printf(fmt, args);
          System.out.println();
      }
  
      public static Printer printerToLog(Logger log) {
          return (fmt, args) -> log.info(String.format(fmt, args));
      }
  
      public static String verString(Version version) {
          if ( version == null )
              return "<null>";
          if ( version.equals(Version.UNSET) )
              return "--";
          return Long.toString(version.value());
      }
  
      /** Validate a name as a {@code DataSource} name */
      public static boolean isValidName(String dsName) {
          if ( dsName == null )
              return false;
          return DeltaConst.DataSourceRegex.matcher(dsName).matches();
      }
  
      /** Add a printer to a {@link RDFChanges} */
      public static RDFChanges print(RDFChanges changes) {
          return RDFChangesN.multi(changes, new RDFChangesLog(DeltaOps::printer)) ;
      }
  
      /** Create a {@link TokenWriter} */
      public static TokenWriter tokenWriter(OutputStream out) {
          // Placeholder for text/binary choice.
          // IO ops to buffer
          TokenWriter tokenWriter = TokenWriterText.create(out) ;
          return tokenWriter ;
      }
  }
  