|
1 package org.sapia.regis.loader;
2
3 import java.util.ArrayList  ;
4 import java.util.List ;
5
6 import org.dom4j.io.SAXReader;
7 import org.sapia.util.text.TemplateContextIF;
8 import org.sapia.util.xml.ProcessingException;
9 import org.sapia.util.xml.confix.ConfigurationException;
10 import org.sapia.util.xml.confix.Dom4jProcessor;
11 import org.sapia.util.xml.confix.ObjectCreationCallback;
12 import org.sapia.util.xml.confix.ObjectFactoryIF;
13 import org.sapia.util.xml.confix.XMLConsumer;
14 import org.xml.sax.InputSource ;
15
16
17 public class ChooseTag implements ObjectCreationCallback, TagFactory{
18 private List _whens = new ArrayList ();
19 private Otherwise _otherwise;
20 private TemplateContextIF _ctx;
21 private ObjectFactoryIF _fac;
22
23 public ChooseTag() {
24 }
25
26 public When createWhen() {
27 When whenObj = new When(_ctx, _fac);
28 _whens.add(whenObj);
29
30 return whenObj;
31 }
32
33 public Otherwise createOtherwise() {
34 if(_otherwise != null) {
35 throw new IllegalArgumentException (
36 "'otherwise' element already specified");
37 }
38
39 return _otherwise = new Otherwise(_fac);
40 }
41
42 public Object onCreate() throws ConfigurationException {
43 When current;
44
45 for(int i = 0; i < _whens.size(); i++) {
46 current = (When) _whens.get(i);
47
48 if(current.isEqual()) {
49 return current.create();
50 }
51 }
52
53 if(_otherwise != null) {
54 return _otherwise.create();
55 }
56
57 return new NullObjectImpl();
58 }
59
60 public static class When extends Condition {
61 When(TemplateContextIF ctx, ObjectFactoryIF fac) {
62 super("when", ctx, fac);
63 }
64 }
65
66 public static final class Otherwise implements XMLConsumer {
67 private ObjectFactoryIF _fac;
68 private org.dom4j.Element _elem;
69
70 Otherwise(ObjectFactoryIF fac) {
71 _fac = fac;
72 }
73
74 public Object create() throws ConfigurationException {
75 if(_elem == null) {
76 return new NullObjectImpl();
77 }
78
79 Dom4jProcessor proc = new Dom4jProcessor(_fac);
80
81 try {
82 return proc.process(null, _elem);
83 } catch(ProcessingException e) {
84 throw new ConfigurationException(
85 "Could not process xml nested in 'if' element", e);
86 }
87 }
88
89
92 public void consume(InputSource is) throws Exception {
93 if(_elem != null) {
94 throw new ConfigurationException(
95 "'choose' only takes a SINGLE nested xml element");
96 }
97 SAXReader reader = new SAXReader();
98 _elem = reader.read(is).getRootElement();
99 }
100 }
101
102 public Object create(TemplateContextIF context, ObjectFactoryIF fac) throws Exception {
103 _ctx = context;
104 _fac = fac;
105 return this;
106 }
107 }
108 |
Popular Tags |
Java API By Example, From Geeks To Geeks.