/*

  * 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.writer;

 import org.apache.any23.extractor.ExtractionContext;

 import org.openrdf.model.Resource;

 import org.openrdf.model.URI;

 import org.openrdf.model.Value;

 import java.util.Collection;

 import java.util.HashSet;

 /**

  * A {@link TripleHandler} that collects

  * various information about the extraction process, such as

  * the extractors used and the total number of triples.

  *

  * @author Richard Cyganiak (richard@cyganiak.de)

  */

 public class ReportingTripleHandler implements TripleHandler {

     private final TripleHandler wrapped;

     private final Collection<String> extractorNames = new HashSet<String>();

     private int totalTriples   = 0;

     private int totalDocuments = 0;

     public ReportingTripleHandler(TripleHandler wrapped) {

         if(wrapped == null) {

             throw new NullPointerException("wrapped cannot be null.");

         }

         this.wrapped = wrapped;

     }

     public Collection<String> getExtractorNames() {

         return extractorNames;

     }

     public int getTotalTriples() {

         return totalTriples;

     }

     public int getTotalDocuments() {

         return totalDocuments;

     }

     /**

      * @return a human readable report.

      */

     public String printReport() {

         return String.format("Total Documents: %d, Total Triples: %d", getTotalDocuments(), getTotalTriples());

     }

     public void startDocument(URI documentURI) throws TripleHandlerException {

         totalDocuments++;

         wrapped.startDocument(documentURI);

     }

     public void openContext(ExtractionContext context) throws TripleHandlerException {

         wrapped.openContext(context);

     }

     public void receiveNamespace(

             String prefix,

             String uri,

             ExtractionContext context

     ) throws TripleHandlerException {

         wrapped.receiveNamespace(prefix, uri, context);

     }

     public void receiveTriple(

             Resource s,

             URI p,

             Value o,

             URI g,

             ExtractionContext context

     ) throws TripleHandlerException {

         extractorNames.add(context.getExtractorName());

         totalTriples++;

         wrapped.receiveTriple(s, p, o, g, context);

     }

     public void setContentLength(long contentLength) {

         wrapped.setContentLength(contentLength);

     }

     public void closeContext(ExtractionContext context) throws TripleHandlerException {

         wrapped.closeContext(context);

     }

     public void endDocument(URI documentURI) throws TripleHandlerException {

         wrapped.endDocument(documentURI);

     }

     public void close() throws TripleHandlerException {

         wrapped.close();

     }

 }