/*
    * 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.any23.extractor.rdf;
  
  import org.apache.any23.extractor.ExtractionContext;
  import org.apache.any23.extractor.ExtractionException;
  import org.apache.any23.extractor.ExtractionParameters;
  import org.apache.any23.extractor.ExtractionResult;
  import org.apache.any23.extractor.Extractor;
  import org.apache.any23.extractor.ExtractorDescription;
  import org.openrdf.rio.RDFHandlerException;
  import org.openrdf.rio.RDFParseException;
  import org.openrdf.rio.RDFParser;
  import org.openrdf.rio.helpers.RDFParserBase;
  
  import java.io.IOException;
  import java.io.InputStream;
  
  /**
   * Base class for a generic <i>RDF</i>
   * {@link org.apache.any23.extractor.Extractor.ContentExtractor}.
   *
   * @author Michele Mostarda (mostarda@fbk.eu)
   */
  public abstract class BaseRDFExtractor implements Extractor.ContentExtractor {
  
      private boolean verifyDataType;
      private boolean stopAtFirstError;
  
      /**
       * Constructor, allows to specify the validation and error handling policies.
       *
       * @param verifyDataType if <code>true</code> the data types will be verified,
       *         if <code>false</code> will be ignored.
       * @param stopAtFirstError if <code>true</code> the parser will stop at first parsing error,
       *        if <code>false</code> will ignore non blocking errors.
       */
      public BaseRDFExtractor(boolean verifyDataType, boolean stopAtFirstError) {
          this.verifyDataType = verifyDataType;
          this.stopAtFirstError = stopAtFirstError;
      }
  
      public abstract ExtractorDescription getDescription();
  
      protected abstract RDFParser getParser(
              ExtractionContext extractionContext,
              ExtractionResult extractionResult
      );
  
      public BaseRDFExtractor() {
          this(false, false);
      }
  
      public boolean isVerifyDataType() {
          return verifyDataType;
      }
  
      public void setVerifyDataType(boolean verifyDataType) {
          this.verifyDataType = verifyDataType;
      }
  
      public boolean isStopAtFirstError() {
          return stopAtFirstError;
      }
  
      public void setStopAtFirstError(boolean b) {
          stopAtFirstError = b;
      }
  
      public void run(
              ExtractionParameters extractionParameters,
              ExtractionContext extractionContext,
              InputStream in,
              ExtractionResult extractionResult
      ) throws IOException, ExtractionException {
          try {
              final RDFParser parser = getParser(extractionContext, extractionResult);
              parser.parse(in, extractionContext.getDocumentURI().stringValue());
          } catch (RDFHandlerException ex) {
              throw new IllegalStateException("Unexpected exception.", ex);
          } catch (RDFParseException ex) {
              throw new ExtractionException("Error while parsing RDF document.", ex, extractionResult);
          }
      }
 
 }