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1   /*
2    * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
3    * The software in this package is published under the terms of the CPAL v1.0
4    * license, a copy of which has been included with this distribution in the
5    * LICENSE.txt file.
6    */
7   package org.mule.config.processors;
8   
9   import org.mule.api.MuleContext;
10  import org.mule.api.annotations.expressions.Lookup;
11  import org.mule.api.context.MuleContextAware;
12  import org.mule.api.expression.RequiredValueException;
13  import org.mule.api.registry.InjectProcessor;
14  import org.mule.config.i18n.AnnotationsMessages;
15  import org.mule.util.StringUtils;
16  
17  import java.lang.reflect.Field;
18  
19  import org.apache.commons.logging.Log;
20  import org.apache.commons.logging.LogFactory;
21  
22  /**
23   * TODO
24   */
25  public class LookupInjectionProcessor implements InjectProcessor, MuleContextAware
26  {
27      /**
28       * logger used by this class
29       */
30      protected transient final Log logger = LogFactory.getLog(LookupInjectionProcessor.class);
31  
32      private MuleContext context;
33  
34      public LookupInjectionProcessor()
35      {
36      }
37  
38      public LookupInjectionProcessor(MuleContext context)
39      {
40          this.context = context;
41      }
42  
43      public void setMuleContext(MuleContext context)
44      {
45          this.context = context;
46      }
47  
48      public Object process(Object object)
49      {
50          Field[] fields;
51          try
52          {
53              fields = object.getClass().getDeclaredFields();
54          }
55          catch (NoClassDefFoundError e)
56          {
57              //Only log the warning when debugging
58              if (logger.isDebugEnabled())
59              {
60                  logger.warn(e.toString());
61              }
62              return object;
63          }
64          for (int i = 0; i < fields.length; i++)
65          {
66              Field field = fields[i];
67              if (field.isAnnotationPresent(Lookup.class))
68              {
69                  try
70                  {
71                      field.setAccessible(true);
72                      Object value;
73                      String name = field.getAnnotation(Lookup.class).value();
74                      boolean optional = field.getAnnotation(Lookup.class).optional();
75                      if(StringUtils.isBlank(name))
76                      {
77                          value = context.getRegistry().lookupObject(field.getType());
78                      }
79                      else
80                      {
81                          value = context.getRegistry().lookupObject(name);
82                      }
83                      if (value == null && !optional)
84                      {
85                          throw new RequiredValueException(AnnotationsMessages.lookupNotFoundInRegistry(field.getType(), name, object.getClass()));
86                      }
87  
88                      field.set(object, value);
89                  }
90                  catch (RequiredValueException e)
91                  {
92                      throw e;
93                  }
94                  catch (Exception e)
95                  {
96                      throw new RequiredValueException(AnnotationsMessages.lookupFailedSeePreviousException(object), e);
97                  }
98              }
99          }
100         return object;
101     }
102 }