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1
7 package uk.ac.roe.antigen.builder;
8
9 import java.util.logging.Level  ;
10
11
12 import java.io.StringWriter ;
13 import java.util.Enumeration ;
14 import java.util.Hashtable ;
15 import java.util.Properties ;
16 import java.util.logging.Logger ;
17
18 import org.apache.velocity.Template;
19 import org.apache.velocity.VelocityContext;
20 import org.apache.velocity.app.Velocity;
21 import org.apache.velocity.exception.MethodInvocationException;
22 import org.apache.velocity.exception.ParseErrorException;
23 import org.apache.velocity.exception.ResourceNotFoundException;
24 import org.apache.velocity.runtime.RuntimeConstants;
25 import org.apache.velocity.runtime.RuntimeServices;
26 import org.apache.velocity.runtime.RuntimeSingleton;
27 import org.apache.velocity.runtime.log.LogSystem;
28 import org.apache.velocity.runtime.log.NullLogSystem;
29
30
36 public class MessageProcessor {
37
42 public static class VelocityLoggerWrapper implements LogSystem {
43
46 private final Logger logger = Logger.getLogger(VelocityLoggerWrapper.class.getName());
47
48
51 public void init(RuntimeServices arg0) throws Exception {
52 }
54
55
58 public void logVelocityMessage(int arg0, String arg1) {
59 logger.fine(arg1);
60
61 }
62 }
63
66 private static final Logger logger = Logger.getLogger(MessageProcessor.class.getName());
67
68
71
72
73 public static void main(String [] args) {
74 }
75
76
77
80 static {
81 logger.fine("Initialising Velocity Engine");
82 Properties velocityConfig = new Properties ();
83 velocityConfig.put("resource.loader","class");
84 velocityConfig.put("class.resource.loader.class","org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader");
85 velocityConfig.put(RuntimeConstants.RUNTIME_LOG_LOGSYSTEM_CLASS, VelocityLoggerWrapper.class.getName());
86 try {
87 Velocity.init(velocityConfig);
88 } catch (Exception e) {
89 e.printStackTrace();
91 }
92 }
93
102 public static String processMessage(Hashtable properties, String messageTemplate) throws Exception , ResourceNotFoundException, ParseErrorException, MethodInvocationException {
103 if (messageTemplate!=null) {
104 VelocityContext context = new VelocityContext();
105
106 Template template = Velocity.getTemplate(messageTemplate);
107
108 StringWriter sw = new StringWriter ();
109
110 Enumeration enumer = properties.keys();
111 logger.fine("Properties available to Velocity:");
112 while (enumer.hasMoreElements()) {
113 String key = (String ) enumer.nextElement();
114 Object value = properties.get(key);
115 key = key.replace('.','_'); logger.fine(key + "="+value);
117 context.put(key, value);
118 }
119 template.merge( context, sw );
120
121
122 return sw.toString();
123 } else {
124 return null;
125 }
126 }
127 }
128 |
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