PackageContextResolver


1   package polyglot.types;
2   
3   import polyglot.ast.*;
4   import polyglot.util.*;
5   import polyglot.types.Package;
6   
7   /**
8    * A <code>PackageContextResolver</code> is responsible for looking up types
9    * and packages in a package by name.
10   */
11  public class PackageContextResolver implements Resolver
12  {
13      protected Package   p;
14      protected TypeSystem ts;
15      protected Resolver cr;
16  
17      /**
18       * Create a package context resolver.
19       * @param ts The type system.
20       * @param p The package in whose context to search.
21       * @param cr The resolver to use for looking up types.
22       */
23      public PackageContextResolver(TypeSystem ts, Package   p, Resolver cr) {
24      this.ts = ts;
25      this.p = p;
26      this.cr = cr;
27      }
28  
29      /**
30       * The package in whose context to search.
31       */
32      public Package   package_() {
33          return p;
34      }
35  
36      /**
37       * The system resolver.
38       */
39      public Resolver outer() {
40          return cr;
41      }
42  
43      /**
44       * Find a type object by name.
45       */
46      public Named find(String   name) throws SemanticException {
47      if (! StringUtil.isNameShort(name)) {
48          throw new InternalCompilerError(
49          "Cannot lookup qualified name " + name);
50      }
51  
52          if (cr == null) {
53          return ts.createPackage(p, name);
54          }
55  
56      try {
57          return cr.find(p.fullName() + "." + name);
58      }
59      catch (NoClassException e) {
60              if (!e.getClassName().equals(p.fullName() + "." + name)) {
61                  throw e;
62              }
63          return ts.createPackage(p, name);
64      }
65      }
66  
67      public String   toString() {
68          return "(package-context " + p.toString() + ")";
69      }
70  }
71
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