##### Coverage Report - org.apache.turbine.services.assemblerbroker.util.java.JavaBaseFactory

Classes in this File | Line Coverage | Branch Coverage | Complexity
JavaBaseFactory |
66% | 24/36
83% | 5/6
| 3.6666666666666665;3,667

1 |  |
     package org.apache.turbine.services.assemblerbroker.util.java;
2 |  |
3 |  |
4 |  |
     /*
5 |  |
      * Licensed to the Apache Software Foundation (ASF) under one
6 |  |
      * or more contributor license agreements.  See the NOTICE file
7 |  |
      * distributed with this work for additional information
8 |  |
      * regarding copyright ownership.  The ASF licenses this file
9 |  |
      * to you under the Apache License, Version 2.0 (the
10 |  |
      * "License"); you may not use this file except in compliance
11 |  |
      * with the License.  You may obtain a copy of the License at
12 |  |
      *
13 |  |
      *   http://www.apache.org/licenses/LICENSE-2.0
14 |  |
      *
15 |  |
      * Unless required by applicable law or agreed to in writing,
16 |  |
      * software distributed under the License is distributed on an
17 |  |
      * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
18 |  |
      * KIND, either express or implied.  See the License for the
19 |  |
      * specific language governing permissions and limitations
20 |  |
      * under the License.
21 |  |
      */
22 |  |
23 |  |
     import java.util.Collections;
24 |  |
     import java.util.HashMap;
25 |  |
     import java.util.List;
26 |  |
     import java.util.Map;
27 |  |
28 |  |
     import org.apache.commons.lang.StringUtils;
29 |  |
     import org.apache.commons.logging.Log;
30 |  |
     import org.apache.commons.logging.LogFactory;
31 |  |
     import org.apache.turbine.modules.Assembler;
32 |  |
     import org.apache.turbine.modules.GenericLoader;
33 |  |
     import org.apache.turbine.modules.Loader;
34 |  |
     import org.apache.turbine.services.assemblerbroker.util.AssemblerFactory;
35 |  |
36 |  |
     /**
37 |  |
      * A screen factory that attempts to load a java class from
38 |  |
      * the module packages defined in the TurbineResource.properties.
39 |  |
      *
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      * @author <a href="mailto:leon@opticode.co.za">Leon Messerschmidt</a>
41 |  |
      * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a>
42 |  |
      * @version $Id: JavaBaseFactory.java 1078552 2011-03-06 19:58:46Z tv $
43 |  |
      */
44 | 564 |
     public abstract class JavaBaseFactory<T extends Assembler>
45 |  |
         implements AssemblerFactory<T>
46 |  |
     {
47 |  |
         /** A vector of packages. */
48 | 58 |
         private static List<String> packages = GenericLoader.getPackages();
49 |  |
50 |  |
         /** Logging */
51 | 564 |
         protected Log log = LogFactory.getLog(this.getClass());
52 |  |
53 |  |
         /**
54 |  |
          * A cache for previously obtained Class instances, which we keep in order
55 |  |
          * to reduce the Class.forName() overhead (which can be sizable).
56 |  |
          */
57 | 564 |
         private final Map<String, Class<T>> classCache =
58 |  |
                 Collections.synchronizedMap(new HashMap<String, Class<T>>());
59 |  |
60 |  |
         /**
61 |  |
          * Get an Assembler.
62 |  |
          *
63 |  |
          * @param packageName java package name
64 |  |
          * @param name name of the requested Assembler
65 |  |
          * @return an Assembler
66 |  |
          */
67 |  |
         @SuppressWarnings("unchecked")
68 |  |
         public T getAssembler(String packageName, String name)
69 |  |
         {
70 | 212 |
             T assembler = null;
71 |  |
72 | 212 |
             log.debug("Class Fragment is " + name);
73 |  |
74 | 212 |
             if (StringUtils.isNotEmpty(name))
75 |  |
             {
76 | 212 |
                 for (String p : packages)
77 |  |
                 {
78 | 374 |
                     StringBuffer sb = new StringBuffer();
79 |  |
80 | 374 |
                     sb.append(p).append('.').append(packageName).append('.').append(name);
81 |  |
82 | 374 |
                     String className = sb.toString();
83 |  |
84 | 374 |
                     log.debug("Trying " + className);
85 |  |
86 |  |
                     try
87 |  |
                     {
88 | 374 |
                         Class<T> servClass = classCache.get(className);
89 | 374 |
                         if(servClass == null)
90 |  |
                         {
91 | 350 |
                             servClass = (Class<T>) Class.forName(className.toString());
92 | 62 |
                             classCache.put(className, servClass);
93 |  |
                         }
94 | 86 |
                         assembler = servClass.newInstance();
95 | 86 |
                         break; // for()
96 |  |
                     }
97 | 288 |
                     catch (ClassNotFoundException cnfe)
98 |  |
                     {
99 |  |
                         // Do this so we loop through all the packages.
100 | 288 |
                         log.debug(className + ": Not found");
101 |  |
                     }
102 | 0 |
                     catch (NoClassDefFoundError ncdfe)
103 |  |
                     {
104 |  |
                         // Do this so we loop through all the packages.
105 | 0 |
                         log.debug(className + ": No Class Definition found");
106 |  |
                     }
107 | 0 |
                     catch (ClassCastException cce)
108 |  |
                     {
109 |  |
                         // This means trouble!
110 |  |
                         // Alternatively we can throw this exception so
111 |  |
                         // that it will appear on the client browser
112 | 0 |
                         log.error("Could not load "+className, cce);
113 | 0 |
                         break; // for()
114 |  |
                     }
115 | 0 |
                     catch (InstantiationException ine)
116 |  |
                     {
117 |  |
                         // This means trouble!
118 |  |
                         // Alternatively we can throw this exception so
119 |  |
                         // that it will appear on the client browser
120 | 0 |
                         log.error("Could not load "+className, ine);
121 | 0 |
                         break; // for()
122 |  |
                     }
123 | 0 |
                     catch (IllegalAccessException ilae)
124 |  |
                     {
125 |  |
                         // This means trouble!
126 |  |
                         // Alternatively we can throw this exception so
127 |  |
                         // that it will appear on the client browser
128 | 0 |
                         log.error("Could not load "+className, ilae);
129 | 0 |
                         break; // for()
130 | 288 |
                     }
131 |  |
                     // With ClassCastException, InstantiationException we hit big problems
132 | 288 |
                 }
133 |  |
             }
134 | 212 |
             log.debug("Returning: " + assembler);
135 |  |
136 | 212 |
             return assembler;
137 |  |
         }
138 |  |
139 |  |
         /**
140 |  |
          * Get the loader for this type of assembler
141 |  |
          *
142 |  |
          * @return a Loader
143 |  |
          */
144 |  |
         public abstract Loader<T> getLoader();
145 |  |
146 |  |
         /**
147 |  |
          * Get the size of a possibly configured cache
148 |  |
          *
149 |  |
          * @return the size of the cache in bytes
150 |  |
          */
151 |  |
         public int getCacheSize()
152 |  |
         {
153 | 0 |
             return getLoader().getCacheSize();
154 |  |
         }
155 |  |
     }