ValidatableFieldSupport


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.form;
16  
17  import org.apache.tapestry.IMarkupWriter;
18  import org.apache.tapestry.IRequestCycle;
19  import org.apache.tapestry.valid.ValidatorException;
20  
21  /**
22   * Implements the logic used by {@link RequiredField}s for required field checking on rewind and
23   * generating client-side logic during render.
24   * 
25   * @author Paul Ferraro
26   * @since 4.0
27   */
28  public interface ValidatableFieldSupport
29  {
30      /**
31       * Called during render of the specified component. Determines form element value used to render
32       * element.
33       */
34      public void render(ValidatableField component, IMarkupWriter writer, IRequestCycle cycle);
35  
36      /**
37       * Called during render of the specified component. Renders any contributions from translator
38       * and validators.
39       */
40      public void renderContributions(ValidatableField component, IMarkupWriter writer,
41              IRequestCycle cycle);
42  
43      /**
44       * Called during rewind of the specified component. Specified value is translated via the
45       * component's translator then validated using the component's validators.
46       * 
47       * @throws ValidatorException
48       *             if translation or validation fails
49       */
50      public void bind(ValidatableField component, IMarkupWriter writer, IRequestCycle cycle,
51              String   value);
52  }
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