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1 package fr.improve.struts.taglib.layout.el;
2
3 import java.lang.reflect.InvocationTargetException  ;
4 import java.util.Iterator ;
5
6 import javax.servlet.jsp.JspException ;
7 import javax.servlet.jsp.PageContext ;
8
9 import org.apache.commons.beanutils.PropertyUtils;
10
11 import fr.improve.struts.taglib.layout.util.LayoutUtils;
12 import fr.improve.struts.taglib.layout.util.ParentFinder;
13
14
17 public class VarBlock implements Block {
18
19 private String name;
20 private String property;
21
22 public VarBlock(String in_name, String in_property) {
23 name = in_name;
24 property = in_property;
25 }
26
27
30 public String evaluate(PageContext in_pg) throws EvaluationException {
31 Object lc_bean = null;
32 String lc_name = Expression.evaluate(name, in_pg);
33 String lc_property = Expression.evaluate(property, in_pg);
34
35 if ("this".equals(lc_name)) {
36 lc_bean = ParentFinder.getLastTag(in_pg);
37 } else {
38 lc_bean = in_pg.findAttribute(lc_name);
39 }
40
41 if (lc_bean==null) {
43 int lc_indexStart = lc_name.indexOf('[');
44 int lc_indexEnd = lc_name.indexOf(']');
45 if (lc_indexStart!=-1 && lc_indexEnd!=-1 && lc_indexStart < lc_indexEnd) {
46 String lc_beanName = lc_name.substring(0, lc_indexStart);
47 Iterator lc_it;
48 try {
49 lc_it = LayoutUtils.getIterator(in_pg, lc_beanName, null);
50 } catch (JspException e) {
51 throw new EvaluationException("Could not get iterator for bean " + lc_beanName);
52 }
53 int lc_pos = Integer.parseInt(lc_name.substring(lc_indexStart+1, lc_indexEnd));
54 while (lc_it.hasNext() && lc_pos>=0) {
55 lc_bean = lc_it.next();
56 lc_pos--;
57 }
58 }
59 }
60
61 if (lc_bean==null) {
62 return "";
63 }
64 if (lc_property!=null) {
65 Object lc_value = null;
66 try {
67 lc_value = PropertyUtils.getProperty(lc_bean, lc_property);
68 } catch (NoSuchMethodException e) {
69 throw new EvaluationException("No method to get the property " + lc_property + " on a " + lc_bean.getClass().getName());
70 } catch (InvocationTargetException e) {
71 throw new EvaluationException("Getter of property " + lc_property + " failed");
72 } catch (IllegalAccessException e) {
73 throw new EvaluationException("Illegal access to property " + lc_property);
74 }
75 if (lc_value==null) {
76 return "";
77 } else {
78 return lc_value.toString();
79 }
80 }
81 return lc_bean.toString();
82 }
83
84 public String toString() {
85 return new StringBuffer ("[V(").append(name).append(".").append(property).append(")]").toString();
86 }
87
88 }
89 |
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