PackageRefactor


1   package JSX;
2   import java.util.Map  ;
3   import java.util.List  ;
4   import java.util.Iterator  ;
5   public class PackageRefactor implements Refactor {
6       Map   map;
7       public PackageRefactor(Map   map) {   //takes a HashMap, HashTable etc
8           this.map = map;
9               // check for correct types:
10              //   String, String
11              //   String, List <---- for safe auto-discovery
12              //check that there is no merging (possible clash) "not many:1"
13              //Alt: load up from an array (of String[][]?  or two String[]?)
14      }
15      public String   mapClassname(String   packageQualifiedClassname) {
16          String   initialPackage = packageQualifiedClassname.substring(0, packageQualifiedClassname.lastIndexOf('.')); // extract package name
17          String   initialClassname = packageQualifiedClassname.substring(packageQualifiedClassname.lastIndexOf('.')+1);
18  
19          Object   packageOrList = map.get(initialPackage);  // map to new one
20          if (packageOrList==null)
21              return packageQualifiedClassname;   // leave as is
22          else if (packageOrList instanceof String  )
23              return ((String  ) packageOrList)+"."+initialClassname;  // create new one
24          else if (packageOrList instanceof List  ) {   //search through list
25              boolean found = false;
26              String   newFullName = null;
27              for (Iterator   i = ((List  )packageOrList).iterator(); i.hasNext(); ) {
28                  newFullName = ((String  )i.next())+"."+initialClassname; 
29                  Class   clazz;
30                  try {
31                      clazz=Thread.currentThread().getContextClassLoader().loadClass(newFullName); // we could factor this out
32                      found = true;
33                      break;  // success!  Now end the search
34                  } catch (ClassNotFoundException   ignored) {}
35              }
36              if (found)
37                  return newFullName;
38              else
39                  return null;    // auto-discovery failed - throw ClassNotFoundException?
40          }
41          else
42              throw new Error  ("Value corresponding to "+ initialPackage +" is "+ packageOrList.getClass() + " but should be List, String or null");
43      }
44  }
45
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