/*

  * 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;

 import org.apache.any23.mime.MIMEType;

 import org.apache.any23.rdf.Prefixes;

 import java.util.ArrayList;

 import java.util.Collection;

 /**

  * This class is a simple and default-like implementation of {@link ExtractorFactory}.

  *

  * @param <T> the type of the {@link Extractor} served by this factory.

  */

 public class SimpleExtractorFactory<T extends Extractor<?>> implements ExtractorFactory<T> {

     private final String name;

     private final Prefixes prefixes;

     private final Collection<MIMEType> supportedMIMETypes = new ArrayList<MIMEType>();

     private final String exampleInput;

     private final Class<T> extractorClass;

     /**

      * Creates an instance of a {@link ExtractorFactory} serving concrete implementation

      * instances of {@link Extractor}.

      *

      * @param name of the {@link Extractor}.

      * @param prefixes handled {@link org.apache.any23.rdf.Prefixes}.

      * @param supportedMIMETypes collection of supported MIME Types.

      * @param exampleInput a string acting as a input example.

      * @param extractorClass concrete implementation class of the {@link Extractor}.

      * @param <S> the concrete type of the {@link Extractor}.

      * @return an {@link ExtractorFactory}.

      */

     public static <S extends Extractor<?>> ExtractorFactory<S> create(

             String name,

             Prefixes prefixes,

             Collection<String> supportedMIMETypes,

             String exampleInput,

             Class<S> extractorClass

     ) {

         return new SimpleExtractorFactory<S>(name, prefixes, supportedMIMETypes, exampleInput, extractorClass);

     }

     /**

      * @return the name of the {@link Extractor}

      */

     public String getExtractorName() {

         return name;

     }

     /**

      * @return the handled {@link org.apache.any23.rdf.Prefixes}

      */

     public Prefixes getPrefixes() {

         return prefixes;

     }

     /**

      * @return the supported {@link org.apache.any23.mime.MIMEType}

      */

     public Collection<MIMEType> getSupportedMIMETypes() {

         return supportedMIMETypes;

     }

     @Override

     public Class<T> getExtractorType() {

         return extractorClass;

     }

     /**

      * @return an instance of type T concrete implementation of {@link Extractor}

      */

     @Override

     public T createExtractor() {

         try {

             return extractorClass.newInstance();

         } catch (IllegalAccessException ex) {

             throw new RuntimeException("Zero-argument constructor not public?", ex);

         } catch (InstantiationException ex) {

             throw new RuntimeException("Non-instantiable type?", ex);

         }

     }

     /**

      * @return an input example

      */

     @Override

     public String getExampleInput() {

         return exampleInput;

     }

     private SimpleExtractorFactory(

             String name,

             Prefixes prefixes,

             Collection<String> supportedMIMETypes,

             String exampleInput,

             Class<T> extractorClass

     ) {

         this.name = name;

         this.prefixes = (prefixes == null) ? Prefixes.EMPTY : prefixes;

         for (String type : supportedMIMETypes) {

             this.supportedMIMETypes.add(MIMEType.parse(type));

         }

         this.exampleInput = exampleInput;

         this.extractorClass = extractorClass;

     }

 }