1   /*
2    *  Copyright (c) 1998-2001, The University of Sheffield.
3    *
4    *  This file is part of GATE (see http://gate.ac.uk/), and is free
5    *  software, licenced under the GNU Library General Public License,
6    *  Version 2, June 1991 (in the distribution as file licence.html,
7    *  and also available at http://gate.ac.uk/gate/licence.html).
8    *
9    *  Valentin Tablan 26/10/2001
10   *
11   *  $Id: LRPersistence.java,v 1.2 2001/10/29 17:11:26 valyt Exp $
12   *
13   */
14  package gate.util.persistence;
15  
16  import gate.*;
17  import gate.creole.*;
18  import gate.util.*;
19  import gate.persist.PersistenceException;
20  
21  import java.util.*;
22  import java.io.*;
23  
24  public class LRPersistence extends ResourcePersistence {
25  
26    /**
27     * Populates this Persistence with the data that needs to be stored from the
28     * original source object.
29     */
30    public void extractDataFromSource(Object source)throws PersistenceException{
31      //check input
32      if(! (source instanceof LanguageResource)){
33        throw new UnsupportedOperationException(
34                  getClass().getName() + " can only be used for " +
35                  LanguageResource.class.getName() +
36                  " objects!\n" + source.getClass().getName() +
37                  " is not a " + LanguageResource.class.getName());
38      }
39  
40      super.extractDataFromSource(source);
41  
42      LanguageResource lr = (LanguageResource)source;
43      if(lr.getDataStore() == null){
44        dsData = null;
45      }else{
46        dsData = PersistenceManager.
47                 getPersistentRepresentation(lr.getDataStore());
48        persistenceID = lr.getLRPersistenceId();
49      }
50    }
51  
52    /**
53     * Creates a new object from the data contained. This new object is supposed
54     * to be a copy for the original object used as source for data extraction.
55     */
56    public Object createObject()throws PersistenceException,
57                                       ResourceInstantiationException{
58      if(dsData == null) return super.createObject();
59      else{
60        //persistent doc
61        initParams = PersistenceManager.getTransientRepresentation(initParams);
62  
63        DataStore ds = (DataStore)PersistenceManager.
64                       getTransientRepresentation(dsData);
65        ((Map)initParams).put(DataStore.DATASTORE_FEATURE_NAME, ds);
66        ((Map)initParams).put(DataStore.LR_ID_FEATURE_NAME, persistenceID);
67        return super.createObject();
68      }
69    }
70  
71    protected Serializable dsData;
72    protected Object persistenceID;
73    static final long serialVersionUID = 3541034274225534363L;
74  }