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Diffstat (limited to 'src/proguard/obfuscate/AttributeUsageMarker.java')
-rw-r--r-- | src/proguard/obfuscate/AttributeUsageMarker.java | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/src/proguard/obfuscate/AttributeUsageMarker.java b/src/proguard/obfuscate/AttributeUsageMarker.java new file mode 100644 index 0000000..e772324 --- /dev/null +++ b/src/proguard/obfuscate/AttributeUsageMarker.java @@ -0,0 +1,71 @@ +/* + * ProGuard -- shrinking, optimization, obfuscation, and preverification + * of Java bytecode. + * + * Copyright (c) 2002-2009 Eric Lafortune (eric@graphics.cornell.edu) + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ +package proguard.obfuscate; + +import proguard.classfile.*; +import proguard.classfile.attribute.Attribute; +import proguard.classfile.attribute.visitor.AttributeVisitor; +import proguard.classfile.util.SimplifiedVisitor; + +/** + * This ClassVisitor marks all attributes that it visits. + * + * @see AttributeShrinker + * + * @author Eric Lafortune + */ +public class AttributeUsageMarker +extends SimplifiedVisitor +implements AttributeVisitor +{ + // A visitor info flag to indicate the attribute is being used. + private static final Object USED = new Object(); + + + // Implementations for AttributeVisitor. + + public void visitAnyAttribute(Clazz clazz, Attribute attribute) + { + markAsUsed(attribute); + } + + + // Small utility methods. + + /** + * Marks the given VisitorAccepter as being used (or useful). + * In this context, the VisitorAccepter will be an Attribute object. + */ + private static void markAsUsed(VisitorAccepter visitorAccepter) + { + visitorAccepter.setVisitorInfo(USED); + } + + + /** + * Returns whether the given VisitorAccepter has been marked as being used. + * In this context, the VisitorAccepter will be an Attribute object. + */ + static boolean isUsed(VisitorAccepter visitorAccepter) + { + return visitorAccepter.getVisitorInfo() == USED; + } +} |