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 log.debug("Class Fragment is " + name);
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71 if (StringUtils.isNotEmpty(name))
72 {
73 for (String p : packages)
74 {
75 StringBuilder sb = new StringBuilder();
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77 sb.append(p).append('.').append(packageName).append('.').append(name);
78 String className = sb.toString();
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80 log.debug("Trying " + className);
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82 try
83 {
84 Class<T> servClass = classCache.get(className);
85 if (servClass == null)
86 {
87 servClass = (Class<T>) Class.forName(className);
88 classCache.put(className, servClass);
89 }
90 assembler = servClass.newInstance();
91 break;
92 }
93 catch (ClassNotFoundException cnfe)
94 {
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96 log.debug(className + ": Not found");
97 }
98 catch (NoClassDefFoundError ncdfe)
99 {
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101 log.debug(className + ": No Class Definition found");
102 }
103 catch (ClassCastException cce)
104 {
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108 log.error("Could not load "+className, cce);
109 break;
110 }
111 catch (InstantiationException ine)
112 {
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116 log.error("Could not load "+className, ine);
117 break;
118 }
119 catch (IllegalAccessException ilae)
120 {
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124 log.error("Could not load "+className, ilae);
125 break;
126 }
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128 }
129 }
130 log.debug("Returning: " + assembler);
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132 return assembler;
133 }
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140 @Override
141 public abstract Loader<T> getLoader();
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148 @Override
149 public int getCacheSize()
150 {
151 return getLoader().getCacheSize();
152 }
153 }