// BSD License (http://www.galagosearch.org/license)

 package org.galagosearch.core.store;

 import java.io.IOException;

 import java.util.Collections;

 import java.util.List;

 import org.galagosearch.core.parse.Document;

 import org.galagosearch.core.parse.DocumentIndexReader;

 /**

  * <p>A DocumentStore that reads document data from corpus files.</p>

  * A DocumentIndexStore checks the corpus files sequentially until

  * it finds a matching document.</p>

  * @author trevor

  */

 public class DocumentIndexStore implements DocumentStore {

     List<DocumentIndexReader> readers;

     public DocumentIndexStore(DocumentIndexReader reader) {

         this(Collections.singletonList(reader));

     }

     public DocumentIndexStore(List<DocumentIndexReader> readers) {

         this.readers = readers;

     }

     public Document get(String identifier) throws IOException {

         for (DocumentIndexReader reader : readers) {

             Document document = reader.getDocument(identifier);

             if (document != null) {

                 return document;

             }

         }

         return null;

     }

     public void close() throws IOException {

         for (DocumentIndexReader reader : readers) {

             reader.close();

         }

     }

 }