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diff --git a/src/proguard/classfile/editor/ConstantAdder.java b/src/proguard/classfile/editor/ConstantAdder.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.editor;
+
+import proguard.classfile.*;
+import proguard.classfile.constant.*;
+import proguard.classfile.constant.visitor.ConstantVisitor;
+
+/**
+ * This ConstantVisitor adds all constants that it visits to the constant pool
+ * of a given target class.
+ *
+ * @author Eric Lafortune
+ */
+public class ConstantAdder
+implements   ConstantVisitor
+{
+    private final ConstantPoolEditor constantPoolEditor;
+
+    private int constantIndex;
+
+
+    /**
+     * Creates a new ConstantAdder that will copy constants into the given
+     * target class.
+     */
+    public ConstantAdder(ProgramClass targetClass)
+    {
+        constantPoolEditor = new ConstantPoolEditor(targetClass);
+    }
+
+
+    /**
+     * Adds a copy of the specified constant in the given class and returns
+     * its index. If the specified index is 0, the returned value is 0 too.
+     */
+    public int addConstant(Clazz clazz, int constantIndex)
+    {
+        clazz.constantPoolEntryAccept(constantIndex, this);
+
+        return this.constantIndex;
+    }
+
+
+    /**
+     * Adds a copy of the given constant in the given class and returns
+     * its index.
+     */
+    public int addConstant(Clazz clazz, Constant constant)
+    {
+        constant.accept(clazz, this);
+
+        return this.constantIndex;
+    }
+
+
+    /**
+     * Returns the index of the most recently created constant in the constant
+     * pool of the target class.
+     */
+    public int getConstantIndex()
+    {
+        return constantIndex;
+    }
+
+
+    // Implementations for ConstantVisitor.
+
+    public void visitIntegerConstant(Clazz clazz, IntegerConstant integerConstant)
+    {
+        constantIndex =
+            constantPoolEditor.addIntegerConstant(integerConstant.getValue());
+    }
+
+
+    public void visitLongConstant(Clazz clazz, LongConstant longConstant)
+    {
+        constantIndex =
+            constantPoolEditor.addLongConstant(longConstant.getValue());
+    }
+
+
+    public void visitFloatConstant(Clazz clazz, FloatConstant floatConstant)
+    {
+        constantIndex =
+            constantPoolEditor.addFloatConstant(floatConstant.getValue());
+    }
+
+
+    public void visitDoubleConstant(Clazz clazz, DoubleConstant doubleConstant)
+    {
+        constantIndex =
+            constantPoolEditor.addDoubleConstant(doubleConstant.getValue());
+    }
+
+
+    public void visitStringConstant(Clazz clazz, StringConstant stringConstant)
+    {
+        constantIndex =
+            constantPoolEditor.addStringConstant(stringConstant.getString(clazz),
+                                                 stringConstant.referencedClass,
+                                                 stringConstant.referencedMember);
+    }
+
+
+    public void visitUtf8Constant(Clazz clazz, Utf8Constant utf8Constant)
+    {
+        constantIndex =
+            constantPoolEditor.addUtf8Constant(utf8Constant.getString());
+    }
+
+
+    public void visitFieldrefConstant(Clazz clazz, FieldrefConstant fieldrefConstant)
+    {
+        // First add the referenced class constant, with its own referenced class.
+        clazz.constantPoolEntryAccept(fieldrefConstant.u2classIndex, this);
+
+        // Then add the actual field reference constant, with its referenced
+        // class and class member.
+        constantIndex =
+            constantPoolEditor.addFieldrefConstant(constantIndex,
+                                                   fieldrefConstant.getName(clazz),
+                                                   fieldrefConstant.getType(clazz),
+                                                   fieldrefConstant.referencedClass,
+                                                   fieldrefConstant.referencedMember);
+    }
+
+
+    public void visitInterfaceMethodrefConstant(Clazz clazz, InterfaceMethodrefConstant interfaceMethodrefConstant)
+    {
+        // First add the referenced class constant, with its own referenced class.
+        clazz.constantPoolEntryAccept(interfaceMethodrefConstant.u2classIndex, this);
+
+        // Then add the actual interface method reference constant, with its
+        // referenced class and class member.
+        constantIndex =
+            constantPoolEditor.addInterfaceMethodrefConstant(constantIndex,
+                                                             interfaceMethodrefConstant.getName(clazz),
+                                                             interfaceMethodrefConstant.getType(clazz),
+                                                             interfaceMethodrefConstant.referencedClass,
+                                                             interfaceMethodrefConstant.referencedMember);
+    }
+
+
+    public void visitMethodrefConstant(Clazz clazz, MethodrefConstant methodrefConstant)
+    {
+        // First add the referenced class constant, with its own referenced class.
+        clazz.constantPoolEntryAccept(methodrefConstant.u2classIndex, this);
+
+        // Then add the actual method reference constant, with its referenced
+        // class and class member.
+        constantIndex =
+            constantPoolEditor.addMethodrefConstant(constantIndex,
+                                                    methodrefConstant.getName(clazz),
+                                                    methodrefConstant.getType(clazz),
+                                                    methodrefConstant.referencedClass,
+                                                    methodrefConstant.referencedMember);
+    }
+
+
+    public void visitClassConstant(Clazz clazz, ClassConstant classConstant)
+    {
+        // Add the class constant, with its referenced class..
+        constantIndex =
+            constantPoolEditor.addClassConstant(classConstant.getName(clazz),
+                                                classConstant.referencedClass);
+    }
+
+
+    public void visitNameAndTypeConstant(Clazz clazz, NameAndTypeConstant nameAndTypeConstant)
+    {
+        constantIndex =
+            constantPoolEditor.addNameAndTypeConstant(nameAndTypeConstant.getName(clazz),
+                                                      nameAndTypeConstant.getType(clazz));
+    }
+}