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1   /*
2    * $Id: StrutsObjectFactory.java 471756 2006-11-06 15:01:43Z husted $
3    *
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *  http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing,
15   * software distributed under the License is distributed on an
16   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17   * KIND, either express or implied.  See the License for the
18   * specific language governing permissions and limitations
19   * under the License.
20   */
21  // Copyright 2006 Google Inc. All Rights Reserved.
22  
23  package org.apache.struts2.impl;
24  
25  import java.util.HashMap;
26  import java.util.Map;
27  
28  import com.opensymphony.xwork2.ObjectFactory;
29  import com.opensymphony.xwork2.Result;
30  import com.opensymphony.xwork2.config.ConfigurationException;
31  import com.opensymphony.xwork2.config.entities.InterceptorConfig;
32  import com.opensymphony.xwork2.config.entities.ResultConfig;
33  import com.opensymphony.xwork2.interceptor.Interceptor;
34  import com.opensymphony.xwork2.util.OgnlUtil;
35  
36  public class StrutsObjectFactory extends ObjectFactory {
37  
38      public Interceptor buildInterceptor(InterceptorConfig interceptorConfig, Map refParams)
39              throws ConfigurationException {
40          String className = interceptorConfig.getClassName();
41  
42          Map<String, String> params = new HashMap<String, String>();
43          Map typeParams = interceptorConfig.getParams();
44          if (typeParams != null && !typeParams.isEmpty())
45              params.putAll(typeParams);
46          if (refParams != null && !refParams.isEmpty())
47              params.putAll(refParams);
48          params.putAll(refParams);
49  
50          try {
51              // interceptor instances are long-lived and used across user sessions, so don't try to pass in any extra
52              // context
53              Object o = buildBean(className, null);
54              OgnlUtil.setProperties(params, o);
55  
56              if (o instanceof Interceptor) {
57                  Interceptor interceptor = (Interceptor) o;
58                  interceptor.init();
59                  return interceptor;
60              }
61  
62              if (o instanceof org.apache.struts2.spi.Interceptor)
63                  return new InterceptorAdapter((org.apache.struts2.spi.Interceptor) o);
64  
65              throw new ConfigurationException(
66                      "Class [" + className + "] does not implement Interceptor", interceptorConfig);
67          } catch (InstantiationException e) {
68              throw new ConfigurationException(
69                      "Unable to instantiate an instance of Interceptor class [" + className + "].",
70                      e, interceptorConfig);
71          } catch (IllegalAccessException e) {
72              throw new ConfigurationException(
73                      "IllegalAccessException while attempting to instantiate an instance of Interceptor class ["
74                              + className + "].",
75                      e, interceptorConfig);
76          } catch (Exception e) {
77              throw new ConfigurationException(
78                      "Caught Exception while registering Interceptor class " + className,
79                      e, interceptorConfig);
80          } catch (NoClassDefFoundError e) {
81              throw new ConfigurationException(
82                      "Could not load class " + className
83                              + ". Perhaps it exists but certain dependencies are not available?",
84                      e, interceptorConfig);
85          }
86      }
87  
88      public Result buildResult(ResultConfig resultConfig, Map extraContext) throws Exception {
89          String resultClassName = resultConfig.getClassName();
90          if (resultClassName == null)
91              return null;
92  
93          Object result = buildBean(resultClassName, extraContext);
94          OgnlUtil.setProperties(resultConfig.getParams(), result, extraContext);
95  
96          if (result instanceof Result)
97              return (Result) result;
98  
99          if (result instanceof org.apache.struts2.spi.Result)
100             return new ResultAdapter((org.apache.struts2.spi.Result) result);
101 
102         throw new ConfigurationException(result.getClass().getName() + " does not implement Result.");
103     }
104 }