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diff --git a/src/proguard/classfile/constant/visitor/ConstantVisitor.java b/src/proguard/classfile/constant/visitor/ConstantVisitor.java
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+++ b/src/proguard/classfile/constant/visitor/ConstantVisitor.java
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+/*
+ * 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.classfile.constant.visitor;
+
+import proguard.classfile.Clazz;
+import proguard.classfile.constant.*;
+
+
+/**
+ * This interface specifies the methods for a visitor of <code>Constant</code>
+ * objects.
+ *
+ * @author Eric Lafortune
+ */
+public interface ConstantVisitor
+{
+    public void visitIntegerConstant(           Clazz clazz, IntegerConstant            integerConstant);
+    public void visitLongConstant(              Clazz clazz, LongConstant               longConstant);
+    public void visitFloatConstant(             Clazz clazz, FloatConstant              floatConstant);
+    public void visitDoubleConstant(            Clazz clazz, DoubleConstant             doubleConstant);
+    public void visitStringConstant(            Clazz clazz, StringConstant             stringConstant);
+    public void visitUtf8Constant(              Clazz clazz, Utf8Constant               utf8Constant);
+    public void visitFieldrefConstant(          Clazz clazz, FieldrefConstant           fieldrefConstant);
+    public void visitInterfaceMethodrefConstant(Clazz clazz, InterfaceMethodrefConstant interfaceMethodrefConstant);
+    public void visitMethodrefConstant(         Clazz clazz, MethodrefConstant          methodrefConstant);
+    public void visitClassConstant(             Clazz clazz, ClassConstant              classConstant);
+    public void visitNameAndTypeConstant(       Clazz clazz, NameAndTypeConstant        nameAndTypeConstant);
+}