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package org.webmacro.broker; |
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import java.lang.reflect.Constructor; |
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import java.util.Map; |
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import java.util.concurrent.ConcurrentHashMap; |
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import org.slf4j.Logger; |
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import org.slf4j.LoggerFactory; |
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import org.webmacro.Broker; |
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import org.webmacro.Context; |
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import org.webmacro.PropertyException; |
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import org.webmacro.util.Settings; |
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20 | 84 | public class DefaultContextAutoLoader implements ContextAutoLoader { |
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22 | 2 | static Logger _log = LoggerFactory.getLogger(DefaultContextAutoLoader.class); |
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private Broker _broker; |
24 | 12 | private Map _factories = new ConcurrentHashMap(); |
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public void init(Broker b, String name) { |
27 | 12 | _broker = b; |
28 | 12 | loadFactories(name); |
29 | 12 | } |
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public Object get(String name, Context context) throws PropertyException { |
32 | 1160 | Object o = _factories.get(name); |
33 | 1160 | if (o == null) |
34 | 0 | return null; |
35 | 1160 | ContextObjectFactory f = (ContextObjectFactory) o; |
36 | 1160 | return f.get(context); |
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} |
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private void loadFactories (String keyName) |
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{ |
46 | 12 | _broker.getSettings().processListSetting(keyName, new AutoContextSettingsHandler()); |
47 | 12 | } |
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49 | 12 | private class AutoContextSettingsHandler extends Settings.ListSettingHandler |
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{ |
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public void processSetting (String settingKey, String settingValue) |
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{ |
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try |
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{ |
55 | 72 | addAutoVariable(settingKey, settingValue); |
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} |
57 | 0 | catch (Exception e) |
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{ |
59 | 0 | _log.error("Automatic variable (" + settingValue + ") failed to load", e); |
60 | 72 | } |
61 | 72 | } |
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} |
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private void addAutoVariable(String toolName, String className) { |
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Class c; |
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try |
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{ |
84 | 72 | c = _broker.classForName(className); |
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} |
86 | 0 | catch (ClassNotFoundException e) |
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{ |
88 | 0 | _log.warn("Context: Could not locate class for context tool " + className); |
89 | 0 | return; |
90 | 72 | } |
91 | 72 | if (toolName == null || toolName.equals("")) |
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{ |
93 | 0 | toolName = className; |
94 | 0 | int start = 0; |
95 | 0 | int end = toolName.length(); |
96 | 0 | int lastDot = toolName.lastIndexOf('.'); |
97 | 0 | if (lastDot != -1) |
98 | 0 | start = lastDot + 1; |
99 | 0 | toolName = toolName.substring(start, end); |
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} |
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102 | 72 | Constructor ctor = null; |
103 | 72 | Constructor[] ctors = c.getConstructors(); |
104 | 72 | Class[] parmTypes = null; |
105 | 72 | Object instance = null; |
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108 | 162 | for (int i = 0; i < ctors.length; i++) |
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{ |
110 | 90 | parmTypes = ctors[i].getParameterTypes(); |
111 | 90 | if (parmTypes.length == 1 && parmTypes[0].equals(String.class)) |
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{ |
113 | 0 | ctor = ctors[i]; |
114 | 0 | Object[] args = {toolName}; |
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try |
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{ |
117 | 0 | instance = ctor.newInstance(args); |
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} |
119 | 0 | catch (Exception e) |
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{ |
121 | 0 | _log.error("Failed to instantiate tool " |
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+ toolName + " of class " + className + " using constructor " |
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+ ctor.toString(), e); |
124 | 0 | } |
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} |
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} |
127 | 72 | if (instance == null) |
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{ |
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try |
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{ |
132 | 72 | instance = c.newInstance(); |
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} |
134 | 0 | catch (Exception e) |
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{ |
136 | 0 | _log.error("Unable to construct tool " + toolName + " of class " + className, e); |
137 | 0 | return; |
138 | 72 | } |
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} |
140 | 72 | if (instance instanceof ContextObjectFactory) { |
141 | 72 | _factories.put(toolName, instance); |
142 | 72 | _broker.registerAutoContextVariable(toolName, this); |
143 | 72 | _log.info("Registered automatic variable factory " + toolName); |
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} |
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else { |
146 | 0 | _log.warn("Context object " + toolName + " is not of type ContextObjectFactory"); |
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} |
148 | 72 | } |
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} |