1 package org.apache.turbine.services.assemblerbroker.util.java;
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23 import java.util.Collections;
24 import java.util.HashMap;
25 import java.util.List;
26 import java.util.Map;
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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;
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44 public abstract class JavaBaseFactory<T extends Assembler>
45 implements AssemblerFactory<T>
46 {
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48 private static List<String> packages = GenericLoader.getPackages();
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51 protected Log log = LogFactory.getLog(this.getClass());
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57 private final Map<String, Class<T>> classCache =
58 Collections.synchronizedMap(new HashMap<String, Class<T>>());
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67 @SuppressWarnings("unchecked")
68 public T getAssembler(String packageName, String name)
69 {
70 T assembler = null;
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72 log.debug("Class Fragment is " + name);
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74 if (StringUtils.isNotEmpty(name))
75 {
76 for (String p : packages)
77 {
78 StringBuffer sb = new StringBuffer();
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80 sb.append(p).append('.').append(packageName).append('.').append(name);
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82 String className = sb.toString();
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84 log.debug("Trying " + className);
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86 try
87 {
88 Class<T> servClass = classCache.get(className);
89 if(servClass == null)
90 {
91 servClass = (Class<T>) Class.forName(className.toString());
92 classCache.put(className, servClass);
93 }
94 assembler = servClass.newInstance();
95 break;
96 }
97 catch (ClassNotFoundException cnfe)
98 {
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100 log.debug(className + ": Not found");
101 }
102 catch (NoClassDefFoundError ncdfe)
103 {
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105 log.debug(className + ": No Class Definition found");
106 }
107 catch (ClassCastException cce)
108 {
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112 log.error("Could not load "+className, cce);
113 break;
114 }
115 catch (InstantiationException ine)
116 {
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120 log.error("Could not load "+className, ine);
121 break;
122 }
123 catch (IllegalAccessException ilae)
124 {
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128 log.error("Could not load "+className, ilae);
129 break;
130 }
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132 }
133 }
134 log.debug("Returning: " + assembler);
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136 return assembler;
137 }
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144 public abstract Loader<T> getLoader();
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151 public int getCacheSize()
152 {
153 return getLoader().getCacheSize();
154 }
155 }