1 package net.sourceforge.pmd;
2
3 import java.util.HashMap;
4 import java.util.List;
5 import java.util.Map;
6
7 import net.sourceforge.pmd.lang.Language;
8 import net.sourceforge.pmd.lang.ast.Node;
9 import net.sourceforge.pmd.lang.rule.RuleChainVisitor;
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16
17 public class RuleChain {
18
19 private final Map<Language, RuleChainVisitor> languageToRuleChainVisitor = new HashMap<Language, RuleChainVisitor>();
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27
28 public void add(RuleSet ruleSet) {
29 for (Rule r : ruleSet.getRules()) {
30 add(ruleSet, r);
31 }
32 }
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41
42 private void add(RuleSet ruleSet, Rule rule) {
43 RuleChainVisitor visitor = getRuleChainVisitor(rule.getLanguage());
44 if (visitor != null) {
45 visitor.add(ruleSet, rule);
46 }
47 }
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59
60 public void apply(List<Node> nodes, RuleContext ctx, Language language) {
61 RuleChainVisitor visitor = getRuleChainVisitor(language);
62 if (visitor != null) {
63 visitor.visitAll(nodes, ctx);
64 }
65 }
66
67
68 private RuleChainVisitor getRuleChainVisitor(Language language) {
69 RuleChainVisitor visitor = languageToRuleChainVisitor.get(language);
70 if (visitor == null) {
71 if (language.getRuleChainVisitorClass() != null) {
72 try {
73 visitor = (RuleChainVisitor) language.getRuleChainVisitorClass().newInstance();
74 } catch (InstantiationException e) {
75 throw new IllegalStateException("Failure to created RuleChainVisitor: "
76 + language.getRuleChainVisitorClass(), e);
77 } catch (IllegalAccessException e) {
78 throw new IllegalStateException("Failure to created RuleChainVisitor: "
79 + language.getRuleChainVisitorClass(), e);
80 }
81 languageToRuleChainVisitor.put(language, visitor);
82 } else {
83 throw new IllegalArgumentException("Language does not have a RuleChainVisitor: " + language);
84 }
85 }
86 return visitor;
87 }
88 }