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/*
* Javassist, a Java-bytecode translator toolkit.
* Copyright (C) 1999-2007 Shigeru Chiba. All Rights Reserved.
*
* 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. Alternatively, the contents of this file may be used under
* the terms of the GNU Lesser General Public License Version 2.1 or later.
*
* 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.
*/
package javassist;
import java.io.InputStream;
import java.net.URL;
/**
* <code>ClassPath</code> is an interface implemented by objects
* representing a class search path.
* <code>ClassPool</code> uses those objects for reading class files.
*
* <p>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 ClassPool#removeClassPath(ClassPath)
*/
public interface ClassPath {
/**
* Opens a class file.
* This method may be called just to examine whether the class file
* exists as well as to read the contents of the 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 will be 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
* @see javassist.Translator
*/
InputStream openClassfile(String classname) throws NotFoundException;
/**
* Returns the uniform resource locator (URL) of the class file
* with the specified name.
*
* @param classname a fully-qualified class name.
* @return null if the specified class file could not be found.
*/
URL find(String classname);
/**
* This method is invoked when the <code>ClassPath</code> object is
* detached from the search path. It will be an empty method in most of
* classes.
*/
void close();
}
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