Thu, 30 Jul 2009 10:29:53 +0100
6827648: Extremely slow compilation time for visitor pattern code + generics
Summary: Javac unnecessarily recomputates type-substitutions multiple times
Reviewed-by: jjg
1 /*
2 * Copyright 2004-2007 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 */
25 import com.sun.mirror.apt.*;
26 import com.sun.mirror.declaration.*;
27 import com.sun.mirror.type.*;
28 import com.sun.mirror.util.*;
30 import java.util.Collection;
31 import java.util.Set;
33 public class NullAPF implements AnnotationProcessorFactory {
34 static class NullAP implements AnnotationProcessor {
35 NullAP(AnnotationProcessorEnvironment ape) {
36 }
38 public void process() {
39 return;
40 }
41 }
43 static Collection<String> supportedTypes;
45 static {
46 String types[] = {"*"};
47 supportedTypes = java.util.Arrays.asList(types);
48 }
50 /*
51 * Processor doesn't examine any options.
52 */
53 public Collection<String> supportedOptions() {
54 return java.util.Collections.emptySet();
55 }
57 /*
58 * All annotation types are supported.
59 */
60 public Collection<String> supportedAnnotationTypes() {
61 return supportedTypes;
62 }
64 /*
65 * Return the same processor independent of what annotations are
66 * present, if any.
67 */
68 public AnnotationProcessor getProcessorFor(Set<AnnotationTypeDeclaration> atds,
69 AnnotationProcessorEnvironment env) {
70 return new NullAP(env);
71 }
72 }