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diff --git a/src/main/javassist/ClassPath.java b/src/main/javassist/ClassPath.java
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+/*
+ * This file is part of the Javassist toolkit.
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (the "License"); you may not use this file except in
+ * compliance with the License.  You may obtain a copy of the License at
+ * either http://www.mozilla.org/MPL/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * The Original Code is Javassist.
+ *
+ * The Initial Developer of the Original Code is Shigeru Chiba.  Portions
+ * created by Shigeru Chiba are Copyright (C) 1999-2003 Shigeru Chiba.
+ * All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * The development of this software is supported in part by the PRESTO
+ * program (Sakigake Kenkyu 21) of Japan Science and Technology Corporation.
+ */
+
+package javassist;
+
+import java.io.InputStream;
+
+/**
+ * <code>ClassPath</code> is an interface implemented by objects
+ * representing a class search path.
+ * <code>ClassPool</code> uses those objects for reading class files.
+ *
+ * <code>The users can define a class implementing this interface so that
+ * a class file is obtained from a non-standard source.
+ *
+ * @see ClassPool#insertClassPath(ClassPath)
+ * @see ClassPool#appendClassPath(ClassPath)
+ * @see javassist.URLClassPath
+ */
+public interface ClassPath {
+    /**
+     * Opens a class file.
+     *
+     * <p>This method can return null if the specified class file is not
+     * found.  If null is returned, the next search path is examined.
+     * However, if an error happens, this method must throw an exception 
+     * so that the search is terminated.
+     *
+     * <p>This method should not modify the contents of the class file.
+     *
+     * @param classname		a fully-qualified class name
+     * @return		the input stream for reading a class file
+     */
+    InputStream openClassfile(String classname) throws NotFoundException;
+}