/*

  * 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 RDFParserBase 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);

         }

     }

 }