1 package org.apache.turbine.services.assemblerbroker.util.java;
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23 import java.util.List;
24 import java.util.concurrent.ConcurrentHashMap;
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26 import org.apache.commons.lang.StringUtils;
27 import org.apache.commons.logging.Log;
28 import org.apache.commons.logging.LogFactory;
29 import org.apache.turbine.modules.Assembler;
30 import org.apache.turbine.modules.GenericLoader;
31 import org.apache.turbine.modules.Loader;
32 import org.apache.turbine.services.assemblerbroker.util.AssemblerFactory;
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42 public abstract class JavaBaseFactory<T extends Assembler>
43 implements AssemblerFactory<T>
44 {
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46 private static List<String> packages = GenericLoader.getPackages();
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49 protected Log log = LogFactory.getLog(this.getClass());
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55 private final ConcurrentHashMap<String, Class<T>> classCache = new ConcurrentHashMap<String, Class<T>>();
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64 @SuppressWarnings("unchecked")
65 public T getAssembler(String packageName, String name)
66 {
67 T assembler = null;
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69 if (log.isDebugEnabled())
70 {
71 log.debug("Class Fragment is " + name);
72 }
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74 if (StringUtils.isNotEmpty(name))
75 {
76 for (String p : packages)
77 {
78 StringBuilder sb = new StringBuilder();
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80 sb.append(p).append('.').append(packageName).append('.').append(name);
81 String className = sb.toString();
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83 if (log.isDebugEnabled())
84 {
85 log.debug("Trying " + className);
86 }
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88 try
89 {
90 Class<T> servClass = classCache.get(className);
91 if (servClass == null)
92 {
93 servClass = (Class<T>) Class.forName(className);
94 Class<T> _servClass = classCache.putIfAbsent(className, servClass);
95 if (_servClass != null)
96 {
97 servClass = _servClass;
98 }
99 }
100 assembler = servClass.newInstance();
101 break;
102 }
103 catch (ClassNotFoundException cnfe)
104 {
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106 log.debug(className + ": Not found");
107 }
108 catch (NoClassDefFoundError ncdfe)
109 {
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111 log.debug(className + ": No Class Definition found");
112 }
113 catch (ClassCastException cce)
114 {
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118 log.error("Could not load "+className, cce);
119 break;
120 }
121 catch (InstantiationException ine)
122 {
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126 log.error("Could not load "+className, ine);
127 break;
128 }
129 catch (IllegalAccessException ilae)
130 {
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134 log.error("Could not load "+className, ilae);
135 break;
136 }
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138 }
139 }
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141 if (log.isDebugEnabled())
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143 log.debug("Returning: " + assembler);
144 }
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146 return assembler;
147 }
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154 @Override
155 public abstract Loader<T> getLoader();
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162 @Override
163 public int getCacheSize()
164 {
165 return getLoader().getCacheSize();
166 }
167 }