|
1 package org.sapia.soto.config;
2
3 import org.dom4j.io.SAXReader;
4
5 import org.sapia.util.text.TemplateContextIF;
6 import org.sapia.util.xml.ProcessingException;
7 import org.sapia.util.xml.confix.ConfigurationException;
8 import org.sapia.util.xml.confix.XMLConsumer;
9 import org.sapia.util.xml.confix.Dom4jProcessor;
10 import org.sapia.util.xml.confix.ObjectCreationCallback;
11 import org.sapia.util.xml.confix.ObjectFactoryIF;
12 import org.xml.sax.InputSource  ;
13
14 import java.util.ArrayList ;
15 import java.util.List ;
16
17
18
27 public class Choose implements ObjectCreationCallback {
28 private List _whens = new ArrayList ();
29 private Otherwise _otherwise;
30 private TemplateContextIF _ctx;
31 private ObjectFactoryIF _fac;
32
33 public Choose(TemplateContextIF ctx, ObjectFactoryIF fac) {
34 _ctx = ctx;
35 _fac = fac;
36 }
37
38 public When createWhen() {
39 When whenObj = new When(_ctx, _fac);
40 _whens.add(whenObj);
41
42 return whenObj;
43 }
44
45 public Otherwise createOtherwise() {
46 if (_otherwise != null) {
47 throw new IllegalArgumentException (
48 "'otherwise' element already specified");
49 }
50
51 return _otherwise = new Otherwise(_ctx, _fac);
52 }
53
54 public Object onCreate() throws ConfigurationException {
55 When current;
56
57 for (int i = 0; i < _whens.size(); i++) {
58 current = (When) _whens.get(i);
59
60 if (current.isEqual()) {
61 return current.create();
62 }
63 }
64
65 if (_otherwise != null) {
66 return _otherwise.create();
67 }
68
69 return new NullObjectImpl();
70 }
71
72 public static class When extends Condition {
73 When(TemplateContextIF ctx, ObjectFactoryIF fac) {
74 super("when", ctx, fac);
75 }
76 }
77
78 public static final class Otherwise implements XMLConsumer{
79 private TemplateContextIF _ctx;
80 private ObjectFactoryIF _fac;
81 private org.dom4j.Element _elem;
82
83 Otherwise(TemplateContextIF ctx, ObjectFactoryIF fac) {
84 _ctx = ctx;
85 _fac = fac;
86 }
87
88 public Object create() throws ConfigurationException {
89 if (_elem == null) {
90 return new NullObjectImpl();
91 }
92
93 Dom4jProcessor proc = new Dom4jProcessor(_fac);
94
95 try {
96 return proc.process(null, _elem);
97 } catch (ProcessingException e) {
98 throw new ConfigurationException("Could not process xml nested in 'if' element",
99 e);
100 }
101 }
102
103
106 public void consume(InputSource is) throws Exception {
107 if (_elem != null) {
108 throw new ConfigurationException("'choose' only takes a SINGLE nested xml element");
109 }
110 SAXReader reader = new SAXReader();
111 _elem = reader.read(is).getRootElement();
112 }
113 }
114 }
115
116 |
Popular Tags |
Java API By Example, From Geeks To Geeks.