01: /*
02: * The Unified Mapping Platform (JUMP) is an extensible, interactive GUI
03: * for visualizing and manipulating spatial features with geometry and attributes.
04: *
05: * Copyright (C) 2003 Vivid Solutions
06: *
07: * This program is free software; you can redistribute it and/or
08: * modify it under the terms of the GNU General Public License
09: * as published by the Free Software Foundation; either version 2
10: * of the License, or (at your option) any later version.
11: *
12: * This program is distributed in the hope that it will be useful,
13: * but WITHOUT ANY WARRANTY; without even the implied warranty of
14: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15: * GNU General Public License for more details.
16: *
17: * You should have received a copy of the GNU General Public License
18: * along with this program; if not, write to the Free Software
19: * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20: *
21: * For more information, contact:
22: *
23: * Vivid Solutions
24: * Suite #1A
25: * 2328 Government Street
26: * Victoria BC V8T 5G5
27: * Canada
28: *
29: * (250)385-6040
30: * www.vividsolutions.com
31: */
32:
33: package com.vividsolutions.jump.feature;
34:
35: import java.util.*;
36:
37: /**
38: * Records update transactions on {@link Feature}s, and can apply them
39: * to a {@link FeatureCollection}.
40: */
41: public class FeatureUpdateRecorder {
42: private Map updates = new HashMap();
43: private int updateCount = 0;
44:
45: public FeatureUpdateRecorder() {
46: }
47:
48: public void update(Feature origFeat, Feature newFeat) {
49: updates.put(origFeat, new FeatureUpdate(origFeat, newFeat));
50: updateCount++;
51: }
52:
53: public int getCount() {
54: return updateCount;
55: }
56:
57: /**
58: * Applies updates to an existing FeatureCollection.
59: * The FeatureDataset returned will contain all the Features in the original
60: * dataset which do not have updates, as well as the new versions of updated features
61: */
62: public FeatureDataset applyUpdates(FeatureCollection fc) {
63: FeatureDataset fd = new FeatureDataset(fc.getFeatureSchema());
64:
65: for (Iterator i = fc.iterator(); i.hasNext();) {
66: Feature f = (Feature) i.next();
67: FeatureUpdate fu = (FeatureUpdate) updates.get(f);
68:
69: if (fu == null) {
70: fd.add(f);
71: } else {
72: fd.add(fu.getNew());
73: }
74: }
75:
76: return fd;
77: }
78: }
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