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Java > Open Source Codes > org > codehaus > loom > components > application > DefaultBlockContext


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87 package org.codehaus.loom.components.application;
88
89 import java.io.File JavaDoc;
90 import java.io.InputStream JavaDoc;
91 import org.apache.avalon.framework.context.ContextException;
92 import org.apache.avalon.framework.logger.Logger;
93 import org.apache.avalon.phoenix.BlockContext;
94 import org.codehaus.loom.interfaces.ApplicationContext;
95
96 /**
97  * Context via which Blocks communicate with container.
98  *
99  * @author Peter Donald
100  */

101 final class DefaultBlockContext
102     implements BlockContext
103 {
104     private final String JavaDoc m_name;
105     private final ApplicationContext m_applicationContext;
106
107     DefaultBlockContext( final String JavaDoc name,
108                          final ApplicationContext frame )
109     {
110         m_name = name;
111         m_applicationContext = frame;
112     }
113
114     public Object JavaDoc get( final Object JavaDoc key )
115         throws ContextException
116     {
117         if( BlockContext.APP_NAME.equals( key ) )
118         {
119             return m_applicationContext.getPartitionProfile()
120                 .getMetaData()
121                 .getName();
122         }
123         else if( BlockContext.APP_HOME_DIR.equals( key ) )
124         {
125             return getBaseDirectory();
126         }
127         else if( BlockContext.NAME.equals( key ) )
128         {
129             return getName();
130         }
131         else
132         {
133             throw new ContextException( "Unknown key: " + key );
134         }
135     }
136
137     /**
138      * Base directory of .sar application.
139      *
140      * @return the base directory
141      */

142     public File JavaDoc getBaseDirectory()
143     {
144         return m_applicationContext.getHomeDirectory();
145     }
146
147     /**
148      * Retrieve name of block.
149      *
150      * @return the name of block
151      */

152     public String JavaDoc getName()
153     {
154         return m_name;
155     }
156
157     public void requestShutdown()
158     {
159         m_applicationContext.requestShutdown();
160     }
161
162     public InputStream JavaDoc getResourceAsStream( final String JavaDoc name )
163     {
164         return m_applicationContext.getResourceAsStream( name );
165     }
166
167     public Logger getLogger( final String JavaDoc name )
168     {
169         try
170         {
171             return m_applicationContext.getLogger( getName() ).getChildLogger(
172                 name );
173         }
174         catch( Exception JavaDoc e )
175         {
176             final String JavaDoc message =
177                 "Unable to aquire logger " + name + " due to " + e;
178             throw new IllegalStateException JavaDoc( message );
179         }
180     }
181 }
182
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