ClassPathSupport


1   /*
2    * The contents of this file are subject to the terms of the Common Development
3    * and Distribution License (the License). You may not use this file except in
4    * compliance with the License.
5    *
6    * You can obtain a copy of the License at http://www.netbeans.org/cddl.html
7    * or http://www.netbeans.org/cddl.txt.
8    *
9    * When distributing Covered Code, include this CDDL Header Notice in each file
10   * and include the License file at http://www.netbeans.org/cddl.txt.
11   * If applicable, add the following below the CDDL Header, with the fields
12   * enclosed by brackets [] replaced by your own identifying information:
13   * "Portions Copyrighted [year] [name of copyright owner]"
14   *
15   * The Original Software is NetBeans. The Initial Developer of the Original
16   * Software is Sun Microsystems, Inc. Portions Copyright 1997-2006 Sun
17   * Microsystems, Inc. All Rights Reserved.
18   */
19  
20  package org.netbeans.modules.j2ee.metadata;
21  
22  import java.lang.reflect.Field  ;
23  import org.netbeans.api.java.classpath.ClassPath;
24  import org.netbeans.spi.java.classpath.ClassPathFactory;
25  import org.netbeans.spi.java.classpath.ClassPathImplementation;
26  
27  /**
28   *
29   * @author Andrei Badea
30   */
31  public final class ClassPathSupport {
32  
33      private ClassPathSupport() {
34      }
35  
36      public static ClassPath createWeakProxyClassPath(ClassPath[] delegates) {
37          if (delegates == null) {
38              throw new NullPointerException  ("The delegates parameter cannot be null");
39          }
40          ClassPathImplementation[] impls = new ClassPathImplementation[delegates.length];
41          for (int i = 0; i < delegates.length; i++) {
42               impls[i] = getClassPathImpl(delegates[i]);
43          }
44          return ClassPathFactory.createClassPath(new WeakProxyClassPathImplementation(impls));
45      }
46  
47      private static ClassPathImplementation getClassPathImpl(ClassPath classPath) {
48          try {
49              Field   field = classPath.getClass().getDeclaredField("impl"); // NOI18N
50              field.setAccessible(true);
51              return (ClassPathImplementation)field.get(classPath);
52          } catch (SecurityException   ex) {
53              throw wrapException(ex);
54          } catch (IllegalArgumentException   ex) {
55              throw wrapException(ex);
56          } catch (IllegalAccessException   ex) {
57              throw wrapException(ex);
58          } catch (NoSuchFieldException   ex) {
59              throw wrapException(ex);
60          }
61      }
62  
63      private static Error   wrapException(Throwable   t) {
64          Error   e = new AssertionError  (t.getMessage());
65          e.initCause(t);
66          return e;
67      }
68  }
69
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