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: CorpusPersistence.java 12006 2009-12-01 17:24:28Z thomas_heitz $
13 *
14 */
15
16 package gate.util.persistence;
17
18
19 import java.util.ArrayList;
20 import java.util.Iterator;
21
22 import gate.Corpus;
23 import gate.creole.ResourceInstantiationException;
24 import gate.persist.PersistenceException;
25
26
27 public class CorpusPersistence extends LRPersistence {
28 /**
29 * Populates this Persistence with the data that needs to be stored from the
30 * original source object.
31 */
32 public void extractDataFromSource(Object source)throws PersistenceException{
33 //check input
34 if(! (source instanceof Corpus)){
35 throw new UnsupportedOperationException(
36 getClass().getName() + " can only be used for " +
37 Corpus.class.getName() +
38 " objects!\n" + source.getClass().getName() +
39 " is not a " + Corpus.class.getName());
40 }
41
42 Corpus corpus = (Corpus)source;
43 super.extractDataFromSource(source);
44 if(dsData == null){
45 //transient corpus; we still need to save the docs
46 docList = new ArrayList();
47 Iterator docIter = corpus.iterator();
48 while(docIter.hasNext()){
49 docList.add(PersistenceManager.
50 getPersistentRepresentation(docIter.next()));
51 }
52 }else{
53 //persistent corpus; it takes care of documents by itself
54 //nothing to do :)
55 docList = null;
56 }
57 }
58
59
60 /**
61 * Creates a new object from the data contained. This new object is supposed
62 * to be a copy for the original object used as source for data extraction.
63 */
64 public Object createObject()throws PersistenceException,
65 ResourceInstantiationException{
66 Corpus corpus = (Corpus)super.createObject();
67 if(docList != null){
68 //transient corpus; we need to recreate the docs
69 if(!docList.isEmpty() && corpus.isEmpty()){
70 Iterator docIter = docList.iterator();
71 while(docIter.hasNext()){
72 corpus.add(PersistenceManager.
73 getTransientRepresentation(docIter.next()));
74 }
75
76 }
77 }
78 return corpus;
79 }
80
81
82 protected ArrayList docList;
83 static final long serialVersionUID = 6181534551802883626L;
84 }
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