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diff --git a/src/proguard/classfile/util/ExternalTypeEnumeration.java b/src/proguard/classfile/util/ExternalTypeEnumeration.java
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+++ b/src/proguard/classfile/util/ExternalTypeEnumeration.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.util;
+
+import proguard.classfile.ClassConstants;
+
+
+/**
+ * An <code>ExternalTypeEnumeration</code> provides an enumeration of all
+ * types listed in a given external descriptor string. The method name can
+ * be retrieved separately.
+ * <p>
+ * A <code>ExternalTypeEnumeration</code> object can be reused for processing
+ * different subsequent descriptors, by means of the <code>setDescriptor</code>
+ * method.
+ *
+ * @author Eric Lafortune
+ */
+public class ExternalTypeEnumeration
+{
+    private String descriptor;
+    private int    index;
+
+
+    public ExternalTypeEnumeration(String descriptor)
+    {
+        setDescriptor(descriptor);
+    }
+
+
+    ExternalTypeEnumeration()
+    {
+    }
+
+
+    void setDescriptor(String descriptor)
+    {
+        this.descriptor = descriptor;
+
+        reset();
+    }
+
+
+    public void reset()
+    {
+        index = descriptor.indexOf(ClassConstants.EXTERNAL_METHOD_ARGUMENTS_OPEN) + 1;
+
+        if (index < 1)
+        {
+            throw new IllegalArgumentException("Missing opening parenthesis in descriptor ["+descriptor+"]");
+        }
+    }
+
+
+    public boolean hasMoreTypes()
+    {
+        return index < descriptor.length() - 1;
+    }
+
+
+    public String nextType()
+    {
+        int startIndex = index;
+
+        // Find the next separating comma.
+        index = descriptor.indexOf(ClassConstants.EXTERNAL_METHOD_ARGUMENTS_SEPARATOR,
+                                   startIndex);
+
+        // Otherwise find the closing parenthesis.
+        if (index < 0)
+        {
+            index = descriptor.indexOf(ClassConstants.EXTERNAL_METHOD_ARGUMENTS_CLOSE,
+                                       startIndex);
+            if (index < 0)
+            {
+                throw new IllegalArgumentException("Missing closing parenthesis in descriptor ["+descriptor+"]");
+            }
+        }
+
+        return descriptor.substring(startIndex, index++).trim();
+    }
+
+
+    public String methodName()
+    {
+        return descriptor.substring(0, descriptor.indexOf(ClassConstants.EXTERNAL_METHOD_ARGUMENTS_OPEN)).trim();
+    }
+}