1 /**
2 * BSD-style license; for more info see http://pmd.sourceforge.net/license.html
3 */
4 package net.sourceforge.pmd.symboltable;
5
6 import java.util.ArrayList;
7 import java.util.HashMap;
8 import java.util.HashSet;
9 import java.util.List;
10 import java.util.Map;
11 import java.util.Set;
12
13 /**
14 * Keeps track of the types encountered in a ASTCompilationUnit
15 */
16 public class TypeSet {
17
18
19 /**
20 * TODO should Resolver provide a canResolve() and a resolve()?
21 * Requiring 2 calls seems clunky... but so does this
22 * throwing an exception for flow control...
23 */
24 public interface Resolver {
25 Class resolve(String name) throws ClassNotFoundException;
26 }
27
28 public static class ExplicitImportResolver implements Resolver {
29 private Set<String> importStmts;
30
31 public ExplicitImportResolver(Set<String> importStmts) {
32 this.importStmts = importStmts;
33 }
34
35 public Class resolve(String name) throws ClassNotFoundException {
36 for (String importStmt: importStmts) {
37 if (importStmt.endsWith(name)) {
38 return Class.forName(importStmt);
39 }
40 }
41 throw new ClassNotFoundException("Type " + name + " not found");
42 }
43 }
44
45 public static class CurrentPackageResolver implements Resolver {
46 private String pkg;
47
48 public CurrentPackageResolver(String pkg) {
49 this.pkg = pkg;
50 }
51
52 public Class resolve(String name) throws ClassNotFoundException {
53 return Class.forName(pkg + name);
54 }
55 }
56
57
58 public static class ImplicitImportResolver implements Resolver {
59 public Class resolve(String name) throws ClassNotFoundException {
60 return Class.forName("java.lang." + name);
61 }
62 }
63
64 public static class ImportOnDemandResolver implements Resolver {
65 private Set<String> importStmts;
66
67 public ImportOnDemandResolver(Set<String> importStmts) {
68 this.importStmts = importStmts;
69 }
70
71 public Class resolve(String name) throws ClassNotFoundException {
72 for (String importStmt: importStmts) {
73 if (importStmt.endsWith("*")) {
74 try {
75 String importPkg = importStmt.substring(0, importStmt.indexOf('*') - 1);
76 return Class.forName(importPkg + '.' + name);
77 } catch (ClassNotFoundException cnfe) {
78 }
79 }
80 }
81 throw new ClassNotFoundException("Type " + name + " not found");
82 }
83 }
84
85 public static class PrimitiveTypeResolver implements Resolver {
86 private Map<String, Class> primitiveTypes = new HashMap<String, Class>();
87
88 public PrimitiveTypeResolver() {
89 primitiveTypes.put("int", int.class);
90 primitiveTypes.put("float", float.class);
91 primitiveTypes.put("double", double.class);
92 primitiveTypes.put("long", long.class);
93 primitiveTypes.put("boolean", boolean.class);
94 primitiveTypes.put("byte", byte.class);
95 primitiveTypes.put("short", short.class);
96 primitiveTypes.put("char", char.class);
97 }
98
99 public Class resolve(String name) throws ClassNotFoundException {
100 if (!primitiveTypes.containsKey(name)) {
101 throw new ClassNotFoundException();
102 }
103 return primitiveTypes.get(name);
104 }
105 }
106
107 public static class VoidResolver implements Resolver {
108 public Class resolve(String name) throws ClassNotFoundException {
109 if (name.equals("void")) {
110 return void.class;
111 }
112 throw new ClassNotFoundException();
113 }
114 }
115
116 public static class FullyQualifiedNameResolver implements Resolver {
117 public Class resolve(String name) throws ClassNotFoundException {
118 return Class.forName(name);
119 }
120 }
121
122 private String pkg;
123 private Set<String> imports = new HashSet<String>();
124 private List<Resolver> resolvers = new ArrayList<Resolver>();
125
126 public void setASTCompilationUnitPackage(String pkg) {
127 this.pkg = pkg;
128 }
129
130 public String getASTCompilationUnitPackage() {
131 return pkg;
132 }
133
134 public void addImport(String importString) {
135 imports.add(importString);
136 }
137
138 public int getImportsCount() {
139 return imports.size();
140 }
141
142 public Class findClass(String name) throws ClassNotFoundException {
143
144 if (resolvers.isEmpty()) {
145 buildResolvers();
146 }
147
148 for (Resolver resolver: resolvers) {
149 try {
150 return resolver.resolve(name);
151 } catch (ClassNotFoundException cnfe) {
152 }
153 }
154
155 throw new ClassNotFoundException("Type " + name + " not found");
156 }
157
158 private void buildResolvers() {
159 resolvers.add(new PrimitiveTypeResolver());
160 resolvers.add(new VoidResolver());
161 resolvers.add(new ExplicitImportResolver(imports));
162 resolvers.add(new CurrentPackageResolver(pkg));
163 resolvers.add(new ImplicitImportResolver());
164 resolvers.add(new ImportOnDemandResolver(imports));
165 resolvers.add(new FullyQualifiedNameResolver());
166 }
167
168 }