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Java > Open Source Codes > org > apache > tapestry > pageload > VerifyRequiredParametersVisitor


1 // Copyright 2004, 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.pageload;
16
17 import java.util.Iterator JavaDoc;
18
19 import org.apache.hivemind.ApplicationRuntimeException;
20 import org.apache.tapestry.IComponent;
21 import org.apache.tapestry.spec.IComponentSpecification;
22 import org.apache.tapestry.spec.IParameterSpecification;
23
24 /**
25  * Verify whether all required parameters in the examined component are bound, and if they are not,
26  * throw an exception.
27  *
28  * @author mindbridge
29  * @since 3.0
30  */
31 public class VerifyRequiredParametersVisitor implements IComponentVisitor
32 {
33     /**
34      * @see org.apache.tapestry.pageload.IComponentVisitor#visitComponent(org.apache.tapestry.IComponent)
35      */
36     public void visitComponent(IComponent component)
37     {
38         IComponentSpecification spec = component.getSpecification();
39
40         Iterator JavaDoc i = spec.getRequiredParameters().iterator();
41
42         while (i.hasNext())
43         {
44             IParameterSpecification parameterSpec = (IParameterSpecification) i.next();
45
46             String JavaDoc name = parameterSpec.getParameterName();
47
48             if (component.getBinding(name) == null)
49                 throw new ApplicationRuntimeException(PageloadMessages.requiredParameterNotBound(
50                         name,
51                         component), component, component.getLocation(), null);
52         }
53     }
54
55 }
56
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