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1   package org.codehaus.plexus.component.configurator.converters.composite;
2   
3   /*
4    * The MIT License
5    *
6    * Copyright (c) 2004, The Codehaus
7    *
8    * Permission is hereby granted, free of charge, to any person obtaining a copy of
9    * this software and associated documentation files (the "Software"), to deal in
10   * the Software without restriction, including without limitation the rights to
11   * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
12   * of the Software, and to permit persons to whom the Software is furnished to do
13   * so, subject to the following conditions:
14   *
15   * The above copyright notice and this permission notice shall be included in all
16   * copies or substantial portions of the Software.
17   *
18   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
21   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
24   * SOFTWARE.
25   */
26  
27  import org.codehaus.plexus.component.configurator.ComponentConfigurationException;
28  import org.codehaus.plexus.component.configurator.ConfigurationListener;
29  import org.codehaus.plexus.component.configurator.converters.AbstractConfigurationConverter;
30  import org.codehaus.plexus.component.configurator.converters.ConfigurationConverter;
31  import org.codehaus.plexus.component.configurator.converters.lookup.ConverterLookup;
32  import org.codehaus.plexus.component.configurator.expression.ExpressionEvaluator;
33  import org.codehaus.plexus.configuration.PlexusConfiguration;
34  import org.codehaus.plexus.util.StringUtils;
35  
36  import java.lang.reflect.Array;
37  import java.util.ArrayList;
38  import java.util.List;
39  
40  
41  /**
42   * @author <a href="mailto:kenney@codehaus.org">Kenney Westerhof</a>
43   * @version $Id$
44   */
45  public class ArrayConverter
46      extends AbstractConfigurationConverter
47  {
48      public boolean canConvert( Class type )
49      {
50          return type.isArray();
51      }
52  
53      public Object fromConfiguration( ConverterLookup converterLookup, PlexusConfiguration configuration, Class type,
54                                       Class baseType, ClassLoader classLoader, ExpressionEvaluator expressionEvaluator,
55                                       ConfigurationListener listener )
56          throws ComponentConfigurationException
57      {
58          Object retValue = fromExpression( configuration, expressionEvaluator, type );
59          if ( retValue != null )
60          {
61              return retValue;
62          }
63  
64          List values = new ArrayList();
65  
66          for ( int i = 0; i < configuration.getChildCount(); i++ )
67          {
68              PlexusConfiguration childConfiguration = configuration.getChild( i );
69  
70              String configEntry = childConfiguration.getName();
71  
72              String name = fromXML( configEntry );
73              
74              Class childType = getClassForImplementationHint( null, childConfiguration, classLoader );
75              
76              // check if the name is a fully qualified classname
77  
78              if ( childType == null && name.indexOf( '.' ) > 0 )
79              {
80                  try
81                  {
82                      childType = classLoader.loadClass( name );
83                  }
84                  catch ( ClassNotFoundException e )
85                  {
86                      // doesn't exist - continue processing
87                  }
88              }
89  
90              if ( childType == null )
91              {
92                  // try to find the class in the package of the baseType
93                  // (which is the component being configured)
94  
95                  String baseTypeName = baseType.getName();
96  
97                  int lastDot = baseTypeName.lastIndexOf( '.' );
98  
99                  String className;
100 
101                 if ( lastDot == -1 )
102                 {
103                     className = name;
104                 }
105                 else
106                 {
107                     String basePackage = baseTypeName.substring( 0, lastDot );
108                     className = basePackage + "." + StringUtils.capitalizeFirstLetter( name );
109                 }
110                 
111                 try
112                 {
113                     childType = classLoader.loadClass( className );
114                 }
115                 catch ( ClassNotFoundException e )
116                 {
117                     // doesn't exist, continue processing
118                 }                               
119             }
120 
121             // finally just try the component type of the array
122 
123             if ( childType == null )
124             {
125                 childType = type.getComponentType();
126             }
127 
128             ConfigurationConverter converter = converterLookup.lookupConverterForType( childType );
129             
130             Object object = converter.fromConfiguration( converterLookup, 
131                                                          childConfiguration, 
132                                                          childType, 
133                                                          baseType, 
134                                                          classLoader,
135                                                          expressionEvaluator, 
136                                                          listener );
137 
138             values.add( object );
139         }
140 
141         try
142         {
143             return values.toArray( (Object[]) Array.newInstance( type.getComponentType(), 0 ) );
144         }
145         catch ( ArrayStoreException e )
146         {
147             throw new ComponentConfigurationException( "Cannot assign configuration values to array of type "
148                 + type.getComponentType().getName() + ": " + values );
149         }
150     }
151 
152 }