ComponentConstructorFactory


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.services;
16  
17  import org.apache.tapestry.spec.IComponentSpecification;
18  
19  /**
20   * <code>tapestry.enhance.ComponentConstructorFactory</code> service that acts as a wrapper around
21   * {@link org.apache.tapestry.enhance.EnhancementOperation}, used to take a base component class
22   * and provide an enhanced subclass of it.
23   * 
24   * @author Howard M. Lewis Ship
25   * @since 4.0
26   */
27  public interface ComponentConstructorFactory
28  {
29      /**
30       * Passed a component specification and the base component class name, provides back an object
31       * used to instantiate instances of the component. {@link ComponentConstructor}s are internally
32       * cached, repeated calls with the same specification object will yield the same result.
33       * 
34       * @param specification
35       *            the page or component specification which directs the enhancement operation
36       * @param className
37       *            the name of the base component class (in some cases,
38       *            {@link IComponentSpecification#getComponentClassName() is null andother code
39       *            provides the default)
40       * @returns a constructor used to create instances of the enhanced component class
41       */
42  
43      public ComponentConstructor getComponentConstructor(IComponentSpecification specification,
44              String   className);
45  }
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