01: /*
02: * ProGuard -- shrinking, optimization, obfuscation, and preverification
03: * of Java bytecode.
04: *
05: * Copyright (c) 2002-2007 Eric Lafortune (eric@graphics.cornell.edu)
06: *
07: * This library is free software; you can redistribute it and/or modify it
08: * under the terms of the GNU General Public License as published by the Free
09: * Software Foundation; either version 2 of the License, or (at your option)
10: * any later version.
11: *
12: * This library is distributed in the hope that it will be useful, but WITHOUT
13: * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14: * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
15: * for more details.
16: *
17: * You should have received a copy of the GNU Lesser General Public License
18: * along with this library; if not, write to the Free Software Foundation,
19: * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20: */
21: package proguard.optimize;
22:
23: import proguard.classfile.*;
24: import proguard.classfile.visitor.MemberVisitor;
25: import proguard.optimize.info.*;
26:
27: /**
28: * This <code>MemberVisitor</code> delegates its visits to another given
29: * <code>MemberVisitor</code>, but only when the visited member has optimization
30: * info.
31: *
32: * @see FieldOptimizationInfo
33: * @see MethodOptimizationInfo
34: * @author Eric Lafortune
35: */
36: public class OptimizationInfoMemberFilter implements MemberVisitor {
37: private final MemberVisitor memberVisitor;
38:
39: /**
40: * Creates a new OptimizationInfoMemberFilter.
41: * @param memberVisitor the <code>MemberVisitor</code> to which visits will
42: * be delegated.
43: */
44: public OptimizationInfoMemberFilter(MemberVisitor memberVisitor) {
45: this .memberVisitor = memberVisitor;
46: }
47:
48: // Implementations for MemberVisitor.
49:
50: public void visitProgramField(ProgramClass programClass,
51: ProgramField programField) {
52: // Does the field have optimization info?
53: if (FieldOptimizationInfo
54: .getFieldOptimizationInfo(programField) != null) {
55: memberVisitor.visitProgramField(programClass, programField);
56: }
57: }
58:
59: public void visitLibraryField(LibraryClass libraryClass,
60: LibraryField libraryField) {
61: // Does the field have optimization info?
62: if (FieldOptimizationInfo
63: .getFieldOptimizationInfo(libraryField) != null) {
64: memberVisitor.visitLibraryField(libraryClass, libraryField);
65: }
66: }
67:
68: public void visitProgramMethod(ProgramClass programClass,
69: ProgramMethod programMethod) {
70: // Does the method have optimization info?
71: if (MethodOptimizationInfo
72: .getMethodOptimizationInfo(programMethod) != null) {
73: memberVisitor.visitProgramMethod(programClass,
74: programMethod);
75: }
76: }
77:
78: public void visitLibraryMethod(LibraryClass libraryClass,
79: LibraryMethod libraryMethod) {
80: // Does the method have optimization info?
81: if (MethodOptimizationInfo
82: .getMethodOptimizationInfo(libraryMethod) != null) {
83: memberVisitor.visitLibraryMethod(libraryClass,
84: libraryMethod);
85: }
86: }
87: }
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