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JetspeedPermissionFactory xref
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1   /*
2    * Copyright 2000-2001,2004 The Apache Software Foundation.
3    * 
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    * 
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    * 
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package org.apache.jetspeed.om.security;
18  
19  import org.apache.turbine.services.TurbineServices;
20  import org.apache.turbine.services.resources.ResourceService;
21  
22  import org.apache.jetspeed.services.security.PermissionException;
23  import org.apache.jetspeed.services.security.JetspeedSecurityService;
24  
25  /***
26   * Factory class for creating Jetspeed Permissions.
27   * The permission class is configured in the JR.p
28   *
29   * @author <a href="mailto:taylor@apache.org">David Sean Taylor</a>
30   * @version $Id: JetspeedPermissionFactory.java,v 1.4 2004/02/23 03:14:12 jford Exp $  
31   */
32  public class JetspeedPermissionFactory
33  {
34      private static final String CONFIG_GROUP_CLASSNAME = "permission.class";
35  
36      private static String permissionClassName = null;
37      private static Class permissionClass = null;
38      
39      /***
40       * Factory method to create JetspeedPermission instances.  
41       *
42       *
43       * @throws UnknownEntityException when the permission instance cant be created.
44       * @return Permission a new created permission.
45       */
46      public static Permission getInstance()
47          throws PermissionException
48      {
49          return getInstance(true);
50      }
51  
52      public static Permission getInstance(boolean isNew)
53          throws PermissionException
54      {
55          Permission permission = null;
56  
57          if (null == permissionClassName)
58          {
59              try
60              {
61                  ResourceService serviceConf = ((TurbineServices)TurbineServices.getInstance())
62                                                           .getResources(JetspeedSecurityService.SERVICE_NAME);
63                  permissionClassName = serviceConf.getString(CONFIG_GROUP_CLASSNAME);                                                             
64                  permissionClass = Class.forName(permissionClassName);
65              }
66              catch(Exception e)
67              {
68                  throw new PermissionException(
69                      "PermissionFactory: Failed to create a Class object for Permission implementation: " + e.toString());
70              }
71          }
72  
73          try
74          {
75              permission = (Permission)permissionClass.newInstance();
76              if (permission instanceof BaseJetspeedPermission)
77              {
78                  ((BaseJetspeedPermission)permission).setNew(isNew);
79              }            
80          }
81          catch(Exception e)
82          {
83              throw new PermissionException("Failed instantiate an Permission implementation object: " + e.toString());
84          }
85  
86          return permission;
87      }
88      
89  
90  }
91  
92  
93  
94