ArrayClassLoader


1   package net.sourceforge.groboutils.codecoverage.v2;
2   
3   import java.util.Hashtable  ;
4   
5   public class ArrayClassLoader extends ClassLoader  
6   {
7       //----------------------------
8       // Public data
9       
10  
11  
12      //----------------------------
13      // Private data
14      
15      private Hashtable   m_classList = new Hashtable  ();
16      private Hashtable   m_classCache = new Hashtable  ();
17      
18      //----------------------------
19      // constructors
20      
21      /**
22       * Default constructor
23       */
24      public ArrayClassLoader()
25      {
26          // do nothing
27      }
28      
29      
30      //----------------------------
31      // Public methods
32      
33      
34      /**
35       * Add a new class to the internal list.
36       */
37      public void addClass( String   name, byte[] bytecode )
38      {
39          if (name == null || bytecode == null)
40          {
41              throw new IllegalArgumentException  ("no null args");
42          }
43          this.m_classList.put( name, bytecode );
44      }
45      
46  
47      // inherited from ClassLoader
48      /**
49       * @exception ClassNotFoundException thrown if the given class name
50       *      could not be found, or if there was a problem loading the
51       *      bytecode for the class.
52       */
53      public Class   loadClass( String   name, boolean resolve )
54              throws ClassNotFoundException  
55      {
56          Class   c;
57          
58          if (name == null)
59          {
60              throw new IllegalArgumentException  ("classname is null");
61          }
62          
63          c = (Class  )this.m_classCache.get( name );
64          if (c == null)
65          {
66              byte bytecode[] = getBytecode( name );
67              if (bytecode == null)
68              {
69                  c = findSystemClass( name );
70              }
71              else
72              {
73                  try
74                  {
75                      c = defineClass( name, bytecode, 0, bytecode.length );
76                      this.m_classCache.put( name, c );
77                  }
78                  catch (Exception   ex2)
79                  {
80                      // something wrong with the class format
81                      throw new ClassNotFoundException  (
82                          "Bad class format for class "+name );
83                  }
84              }
85          }
86          if (resolve)
87          {
88              resolveClass( c );
89          }
90          return c;
91      }
92      
93      //----------------------------
94      // Protected methods
95      
96      
97      /**
98       * Retrieves the internal bytecode for the given class.  If not known,
99       * then <tt>null</tt> is returned.
100      *
101      * @param className a non-null class name.
102      */
103     protected byte[] getBytecode( String   className )
104     {
105         byte bytecode[] = (byte[])this.m_classList.get( className );
106         return bytecode;
107     }
108     
109     
110     //----------------------------
111     // Private methods
112 }
113
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