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1 package org.sapia.validator.rules.groovy;
2
3 import groovy.lang.GroovyClassLoader;
4
5 import java.io.ByteArrayInputStream  ;
6 import java.util.Random ;
7
8 import org.sapia.util.xml.confix.ConfigurationException;
9 import org.sapia.validator.Rule;
10 import org.sapia.validator.ValidationContext;
11
12
24 public class GroovyRule extends Rule{
25
26 private static final Random RAND = new Random ();
27
28 private String _name;
29 private String _src;
30 private Rule _inner;
31 private StringBuffer _imports = new StringBuffer ();
32
33 public void addImport(String imp) {
34 _imports.append("import ").append(imp).append(';');
35 }
36
37 public void setImport(String imp) {
38 addImport(imp);
39 }
40
41
44 public Object onCreate() throws ConfigurationException {
45 super.onCreate();
46 try {
47 Class clazz = generate();
48 _inner = (Rule) clazz.newInstance();
49 _inner.setId(getId());
50 _inner.setErrorMessages(getErrorMessages());
51 return this;
52 } catch (RuntimeException e) {
53 throw e;
54 } catch (Exception e) {
55 throw new ConfigurationException("Could not generate Groovy code for: " +
56 _src, e);
57 }
58 }
59
60 public void setText(String src) throws Exception {
61 _src = src;
62 }
63
64
65
68 public void validate(ValidationContext context) {
69 if (_inner == null) {
70 throw new IllegalStateException ("Source code not defined");
71 }
72
73 _inner.validate(context);
74 }
75
76 private synchronized Class generate() throws Exception {
77 if (_src == null) {
78 throw new IllegalStateException ("Groovy source not specified");
79 }
80
81 String src = _src;
82
83 long id = RAND.nextLong();
84 if(id < 0) id = -id;
85 src = _imports.toString() + " class Vlad_Groovy_Rule_Java_" +
86 id + " extends " + Rule.class.getName() + " {" +
87 " public void validate(" + ValidationContext.class.getName() + " context){" + _src + " }" +
88
89 "}";
90
91 ByteArrayInputStream bis = new ByteArrayInputStream (src.getBytes());
92 GroovyClassLoader loader = new GroovyClassLoader(Thread.currentThread()
93 .getContextClassLoader());
94
95 return loader.parseClass(bis, getClass().getName());
96 }
97
98
99 }
100
101
102 |
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