1 /*
2 * EL4J, the Extension Library for the J2EE, adds incremental enhancements to
3 * the spring framework, http://el4j.sf.net
4 * Copyright (C) 2006 by ELCA Informatique SA, Av. de la Harpe 22-24,
5 * 1000 Lausanne, Switzerland, http://www.elca.ch
6 *
7 * EL4J is published under the GNU Lesser General Public License (LGPL)
8 * Version 2.1. See http://www.gnu.org/licenses/
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU Lesser General Public License for more details.
14 *
15 * For alternative licensing, please contact info@elca.ch
16 */
17 package ch.elca.el4j.services.xmlmerge.factory;
18
19 import org.jdom.Element;
20
21 import ch.elca.el4j.services.xmlmerge.AbstractXmlMergeException;
22 import ch.elca.el4j.services.xmlmerge.Operation;
23 import ch.elca.el4j.services.xmlmerge.OperationFactory;
24
25 /**
26 * An operation factory delegating to other operation factories according to the
27 * existence of the original and patch element.
28 *
29 * @svnLink $Revision: 3874 $;$Date: 2009-08-04 14:25:40 +0200 (Di, 04. Aug 2009) $;$Author: swismer $;$URL: https://el4j.svn.sourceforge.net/svnroot/el4j/branches/el4j_3_1/el4j/framework/modules/xml_merge/common/src/main/java/ch/elca/el4j/services/xmlmerge/factory/DiffOperationFactory.java $
30 *
31 * @author Laurent Bovet (LBO)
32 * @author Alex Mathey (AMA)
33 */
34 public class DiffOperationFactory implements OperationFactory {
35
36 /**
37 * OperationFactory this factory delegates to if only the original element
38 * exists.
39 */
40 OperationFactory m_onlyInOriginalOperationFactory;
41
42 /**
43 * OperationFactory this factory delegates to if only the patch element
44 * exists.
45 */
46 OperationFactory m_onlyInPatchOperationFactory;
47
48 /**
49 * OperationFactory this factory delegates to if the original and patch
50 * elements exist.
51 */
52 OperationFactory m_inBothOperationFactory;
53
54 /**
55 * Sets the operation factory this factory delegates to if the original and
56 * patch elements exist.
57 *
58 * @param inBothOperationFactory
59 * the operation factory this factory delegates to if the
60 * original and patch elements exist.
61 */
62 public void setInBothOperationFactory(
63 OperationFactory inBothOperationFactory) {
64 this.m_inBothOperationFactory = inBothOperationFactory;
65 }
66
67 /**
68 * Sets the operation factory this factory delegates to if only the original
69 * element exists.
70 *
71 * @param onlyInOriginalOperationFactory
72 * factory this factory delegates to if only the original element
73 * exists
74 */
75 public void setOnlyInOriginalOperationFactory(
76 OperationFactory onlyInOriginalOperationFactory) {
77 this.m_onlyInOriginalOperationFactory = onlyInOriginalOperationFactory;
78 }
79
80 /**
81 * Sets the operation factory this factory delegates to if only the patch
82 * element exists.
83 *
84 * @param onlyInPatchOperationFactory
85 * factory this factory delegates to if only the patch element
86 * exists
87 */
88 public void setOnlyInPatchOperationFactory(
89 OperationFactory onlyInPatchOperationFactory) {
90 this.m_onlyInPatchOperationFactory = onlyInPatchOperationFactory;
91 }
92
93 /**
94 * {@inheritDoc}
95 */
96 public Operation getOperation(Element originalElement, Element patchElement)
97 throws AbstractXmlMergeException {
98
99 if (originalElement != null && patchElement == null) {
100 return m_onlyInOriginalOperationFactory.getOperation(
101 originalElement, null);
102 }
103
104 if (originalElement == null && patchElement != null) {
105 return m_onlyInPatchOperationFactory.getOperation(null,
106 patchElement);
107 }
108
109 if (originalElement != null && patchElement != null) {
110 return m_inBothOperationFactory.getOperation(originalElement,
111 patchElement);
112 }
113
114 throw new IllegalArgumentException();
115 }
116
117 }