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1 package net.javacoding.jspider.core.impl;
2
3 import net.javacoding.jspider.core.logging.Log;
4 import net.javacoding.jspider.core.logging.LogFactory;
5 import net.javacoding.jspider.core.util.config.PropertySet;
6 import net.javacoding.jspider.spi.Plugin;
7 import net.javacoding.jspider.mod.plugin.console.ConsolePlugin;
8
9 import java.lang.reflect.Constructor  ;
10 import java.lang.reflect.InvocationTargetException ;
11
12
15 public class PluginInstantiator {
16
17 protected Log log;
18
19 public PluginInstantiator() {
20 log = LogFactory.getLog(PluginInstantiator.class);
21 }
22
23
24 public Plugin instantiate(Class pluginClass, String name, PropertySet config) {
25 Plugin plugin = null;
26
27 try {
28 log.debug("first trying to instantiate via ctr with (name, config) params");
29 plugin = instantiateWithNameAndConfig(pluginClass, name, config);
30
31 if (plugin == null) {
32 log.debug("plugin not yet instantiated, trying via ctr with (config) param");
33 plugin = instantiateWithConfig(pluginClass, name, config);
34 }
35 if (plugin == null) {
36 log.debug("plugin not yet instantiated, trying via ctr with (name) param");
37 plugin = instantiateWithName(pluginClass, name, config);
38 }
39 if (plugin == null) {
40 log.debug("plugin not yet instantiated, trying via default constructor");
41 plugin = (Plugin) pluginClass.newInstance();
42 }
43 } catch (InstantiationException e) {
44 log.error("cannot instantiate module - defaulting to console", e);
45 plugin = new ConsolePlugin();
46 } catch (IllegalAccessException e) {
47 log.error("cannot instantiate module - defaulting to console", e);
48 plugin = new ConsolePlugin();
49 }
50 log.debug("plugin instantiated.");
51 return plugin;
52 }
53
54 protected Plugin instantiateWithNameAndConfig(Class pluginClass, String name, PropertySet config) {
55 Plugin plugin = null;
56 try {
57 Class [] paramClasses = new Class [2];
58 paramClasses[0] = String .class;
59 paramClasses[1] = PropertySet.class;
60 Object [] params = new Object [2];
61 params[0] = name;
62 params[1] = config;
63 Constructor constructor = pluginClass.getDeclaredConstructor(paramClasses);
64 plugin = (Plugin) constructor.newInstance(params);
65 } catch (NoSuchMethodException e) {
66 log.debug("cannot instantiate module - constructor with name and PropertySet params not found", e);
67 } catch (InstantiationException e) {
68 log.debug("cannot instantiate module - InstantiationException", e);
69 } catch (InvocationTargetException e) {
70 log.debug("cannot instantiate module - InvocationTargetException", e);
71 } catch (IllegalAccessException e) {
72 log.debug("cannot instantiate module - IllegalAccessException", e);
73 }
74 return plugin;
75 }
76
77 protected Plugin instantiateWithConfig(Class pluginClass, String name, PropertySet config) {
78 Plugin plugin = null;
79 try {
80 Class [] paramClasses = new Class [1];
81 paramClasses[0] = PropertySet.class;
82 Object [] params = new Object [1];
83 params[0] = config;
84 Constructor constructor = pluginClass.getDeclaredConstructor(paramClasses);
85 plugin = (Plugin) constructor.newInstance(params);
86 } catch (NoSuchMethodException e) {
87 log.debug("cannot instantiate module - constructor with PropertySet param not found", e);
88 } catch (InstantiationException e) {
89 log.debug("cannot instantiate module - InstantiationException", e);
90 } catch (InvocationTargetException e) {
91 log.debug("cannot instantiate module - InvocationTargetException", e);
92 } catch (IllegalAccessException e) {
93 log.debug("cannot instantiate module - IllegalAccessException", e);
94 }
95 return plugin;
96 }
97
98 protected Plugin instantiateWithName(Class pluginClass, String name, PropertySet config) {
99 Plugin plugin = null;
100 try {
101 Class [] paramClasses = new Class [1];
102 paramClasses[0] = String .class;
103 Object [] params = new Object [1];
104 params[0] = name;
105 Constructor constructor = pluginClass.getDeclaredConstructor(paramClasses);
106 plugin = (Plugin) constructor.newInstance(params);
107 } catch (NoSuchMethodException e) {
108 log.debug("cannot instantiate module - constructor with name param not found", e);
109 } catch (InstantiationException e) {
110 log.debug("cannot instantiate module - InstantiationException", e);
111 } catch (InvocationTargetException e) {
112 log.debug("cannot instantiate module - InvocationTargetException", e);
113 } catch (IllegalAccessException e) {
114 log.debug("cannot instantiate module - IllegalAccessException", e);
115 }
116 return plugin;
117 }
118
119 }
120 |
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