KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > org > apache > tapestry > enhance > InjectPageWorker


1 // Copyright 2005 The Apache Software Foundation
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 package org.apache.tapestry.enhance;
16
17 import java.lang.reflect.Modifier JavaDoc;
18
19 import org.apache.hivemind.ApplicationRuntimeException;
20 import org.apache.hivemind.Location;
21 import org.apache.hivemind.service.BodyBuilder;
22 import org.apache.hivemind.service.MethodSignature;
23 import org.apache.tapestry.IPage;
24 import org.apache.tapestry.spec.InjectSpecification;
25
26 /**
27  * Injects code to access a named page within the application.
28  *
29  * @author Howard Lewis Ship
30  * @since 4.0
31  */
32 public class InjectPageWorker implements InjectEnhancementWorker
33 {
34     public void performEnhancement(EnhancementOperation op, InjectSpecification spec)
35     {
36         performEnhancement(op, spec.getObject(), spec.getProperty(), spec.getLocation());
37     }
38
39     public void performEnhancement(EnhancementOperation op, String JavaDoc pageName, String JavaDoc propertyName,
40             Location location)
41     {
42         Class JavaDoc propertyType = op.getPropertyType(propertyName);
43
44         if (propertyType == null)
45             propertyType = Object JavaDoc.class;
46         else if (propertyType.isPrimitive())
47             throw new ApplicationRuntimeException(EnhanceMessages.wrongTypeForPageInjection(
48                     propertyName,
49                     propertyType), null, location, null);
50
51         op.claimProperty(propertyName);
52
53         MethodSignature sig = new MethodSignature(propertyType, op
54                 .getAccessorMethodName(propertyName), null, null);
55
56         BodyBuilder builder = new BodyBuilder();
57
58         builder.add("return ");
59
60         // If the property type is not IPage or a superclass of IPage then a cast
61 // is needed.
62
63         if (!propertyType.isAssignableFrom(IPage.class))
64             builder.add("({0})", propertyType.getName());
65
66         builder.add("getPage().getRequestCycle().getPage(\"{0}\");", pageName);
67
68         op.addMethod(Modifier.PUBLIC, sig, builder.toString());
69     }
70 }
71
Popular Tags