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1 package net.javacoding.jspider.core.rule;
2
3
4 import net.javacoding.jspider.api.model.Site;
5 import net.javacoding.jspider.core.rule.impl.RuleSetImpl;
6 import net.javacoding.jspider.core.util.config.*;
7 import net.javacoding.jspider.core.logging.LogFactory;
8 import net.javacoding.jspider.core.logging.Log;
9 import net.javacoding.jspider.spi.Rule;
10
11 import java.util.ArrayList  ;
12 import java.util.List ;
13 import java.lang.reflect.Constructor ;
14 import java.lang.reflect.InvocationTargetException ;
15
16
17
23 public class RuleFactory {
24
25 protected static Ruleset generalSpiderRules;
26 protected static Ruleset generalParserRules;
27
28 public static synchronized Ruleset createGeneralSpiderRules() {
29 if (generalSpiderRules == null) {
30 PropertySet props = ConfigurationFactory.getConfiguration().getJSpiderConfiguration();
31 PropertySet jspiderProps = new MappedPropertySet ( ConfigConstants.JSPIDER, props );
32 generalSpiderRules = createRules(jspiderProps, "spider", null);
33 }
34 return generalSpiderRules;
35 }
36
37 public static synchronized Ruleset createGeneralParserRules() {
38 if (generalParserRules == null) {
39 PropertySet props = ConfigurationFactory.getConfiguration().getJSpiderConfiguration();
40 PropertySet jspiderProps = new MappedPropertySet ( ConfigConstants.JSPIDER, props );
41 generalParserRules = createRules(jspiderProps, "parser", null);
42 }
43 return generalParserRules;
44 }
45
46 public static Ruleset createSiteSpiderRules(Site site) {
47 PropertySet props = ConfigurationFactory.getConfiguration().getSiteConfiguration(site);
48 PropertySet siteProps = new MappedPropertySet ( ConfigConstants.SITE, props );
49 return createRules(siteProps, "spider", generalSpiderRules);
50 }
51
52 public static Ruleset createSiteParserRules(Site site) {
53 PropertySet props = ConfigurationFactory.getConfiguration().getSiteConfiguration(site);
54 PropertySet siteProps = new MappedPropertySet ( ConfigConstants.SITE, props );
55 return createRules(siteProps, "parser", generalParserRules);
56 }
57
58 protected static Ruleset createRules(PropertySet props, String purpose, Ruleset generalRules) {
59 PropertySet rulesProps = new MappedPropertySet(ConfigConstants.RULES, props);
60
61 int rulesCount = rulesProps.getInteger(purpose + "." + ConfigConstants.RULES_COUNT, 0);
62
63 Log log = LogFactory.getLog(RuleFactory.class);
64
65 List rules = new ArrayList ();
66
67 for (int i = 0; i < rulesCount; i++) {
68 String prefix = purpose + "." + (i + 1);
69 PropertySet ruleProps = new MappedPropertySet(prefix, rulesProps);
70 Class ruleClass = ruleProps.getClass(ConfigConstants.RULE_CLASS, null);
71 Rule rule = null;
72
73 if (ruleClass != null) {
74
75 try {
76 Class [] paramTypes = new Class [1];
77 paramTypes[0] = PropertySet.class;
78
79 Object params[] = new Object [1];
80 params[0] = new MappedPropertySet ( ConfigConstants.RULE_CONFIG, ruleProps);
81
82 Constructor constructor = ruleClass.getDeclaredConstructor(paramTypes);
83 rule = (Rule) constructor.newInstance(params);
84
85 } catch (NoSuchMethodException e) {
86 log.debug("rule " + ruleClass.getName() + " hasn't got a config-param constructor");
87 } catch (SecurityException e) {
88 log.info("SecurityException finding constructor");
89 } catch (InstantiationException e) {
90 log.info("InstantiationException finding constructor");
91 } catch (IllegalAccessException e) {
92 log.info("IllegalAccessException finding constructor");
93 } catch (InvocationTargetException e) {
94 log.info("InvocationTargetException finding constructor");
95 }
96
97 if (rule == null) {
98 try {
99 rule = (Rule) ruleClass.newInstance();
100 } catch (InstantiationException e) {
101 log.error("InstantiationException on Rule", e);
102 } catch (IllegalAccessException e) {
103 log.error("IllegalAccessException on Rule instantiation", e);
104 }
105 }
106 if (rule == null) {
107 log.error("rule couldn't be instantiated");
108 } else {
109 log.debug ( "added rule " + rule.getClass().getName() + " to " + purpose + " ruleset");
110 rules.add(rule);
111 }
112 } else {
113 log.error("cannot find rule class '" + ruleProps.getString(ConfigConstants.RULE_CLASS, "<unknown>") + "' for " + purpose + " rules");
114 }
115 }
116 if (generalRules == null) {
117 return new RuleSetImpl(Ruleset.RULESET_GENERAL, rules);
118 } else {
119 return new RuleSetImpl(Ruleset.RULESET_SITE, generalRules, rules);
120 }
121 }
122 }
123 |
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