DefaultImplementationBuilder


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.hivemind.lib;
16  
17  
18  /**
19   * Builds a default implementation of an interface. The fabricated class has no-op
20   * implementions for each method in the interface.  Non-void methods return null,
21   * false or zero.  A cached, shared instance of the empty implementation is kept and will
22   * be returned on future invocations.
23   *
24   * @author Howard Lewis Ship
25   */
26  public interface DefaultImplementationBuilder
27  {
28      /**
29       * Builds a default implementation of the indicated interface, instantiates and returns it.
30       * Results are cached for later re-use.
31       * 
32       * @throws org.apache.hivemind.ApplicationRuntimeException if interfaceType is not an interface.
33       */
34      public Object   buildDefaultImplementation(Class   interfaceType);
35  }
36

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