01 /*
02 * Copyright (c) 1995-2010, The University of Sheffield. See the file
03 * COPYRIGHT.txt in the software or at http://gate.ac.uk/gate/COPYRIGHT.txt
04 *
05 * This file is part of GATE (see http://gate.ac.uk/), and is free
06 * software, licenced under the GNU Library General Public License,
07 * Version 2, June 1991 (in the distribution as file licence.html,
08 * and also available at http://gate.ac.uk/gate/licence.html).
09 *
10 * Valentin Tablan 26/10/2001
11 *
12 * $Id: LRPersistence.java 12006 2009-12-01 17:24:28Z thomas_heitz $
13 *
14 */
15 package gate.util.persistence;
16
17 import java.io.Serializable;
18 import java.util.Map;
19
20 import gate.DataStore;
21 import gate.LanguageResource;
22 import gate.creole.ResourceInstantiationException;
23 import gate.persist.PersistenceException;
24
25 public class LRPersistence extends ResourcePersistence {
26
27 /**
28 * Populates this Persistence with the data that needs to be stored from the
29 * original source object.
30 */
31 public void extractDataFromSource(Object source)throws PersistenceException{
32 //check input
33 if(! (source instanceof LanguageResource)){
34 throw new UnsupportedOperationException(
35 getClass().getName() + " can only be used for " +
36 LanguageResource.class.getName() +
37 " objects!\n" + source.getClass().getName() +
38 " is not a " + LanguageResource.class.getName());
39 }
40
41 super.extractDataFromSource(source);
42 //LR's will have the features saved by their respective persistence
43 //mechanism
44 features = null;
45
46 LanguageResource lr = (LanguageResource)source;
47 if(lr.getDataStore() == null){
48 dsData = null;
49 }else{
50 dsData = PersistenceManager.
51 getPersistentRepresentation(lr.getDataStore());
52 persistenceID = lr.getLRPersistenceId();
53 }
54 }
55
56 /**
57 * Creates a new object from the data contained. This new object is supposed
58 * to be a copy for the original object used as source for data extraction.
59 */
60 public Object createObject()throws PersistenceException,
61 ResourceInstantiationException{
62 if(dsData == null) return super.createObject();
63 else{
64 //persistent doc
65 initParams = PersistenceManager.getTransientRepresentation(initParams);
66
67 DataStore ds = (DataStore)PersistenceManager.
68 getTransientRepresentation(dsData);
69 ((Map)initParams).put(DataStore.DATASTORE_FEATURE_NAME, ds);
70 ((Map)initParams).put(DataStore.LR_ID_FEATURE_NAME, persistenceID);
71 return super.createObject();
72 }
73 }
74
75 protected Serializable dsData;
76 protected Object persistenceID;
77 static final long serialVersionUID = 3541034274225534363L;
78 }
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