scouter.javassist.ClassClassPath Maven / Gradle / Ivy
/*
* Javassist, a Java-bytecode translator toolkit.
* Copyright (C) 1999- 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,
* or the Apache License Version 2.0.
*
* 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 scouter.javassist;
import java.io.InputStream;
import java.net.URL;
/**
* A search-path for obtaining a class file
* by getResourceAsStream() in java.lang.Class.
*
* Try adding a ClassClassPath when a program is running
* with a user-defined class loader and any class files are not found with
* the default ClassPool. For example,
*
*
* ClassPool cp = ClassPool.getDefault();
* cp.insertClassPath(new ClassClassPath(this.getClass()));
*
*
* This code snippet permanently adds a ClassClassPath
* to the default ClassPool. Note that the default
* ClassPool is a singleton. The added
* ClassClassPath uses a class object representing
* the class including the code snippet above.
*
* Class files in a named module are private to that module.
* This method cannot obtain class files in named modules.
*
*
* @see ClassPool#insertClassPath(ClassPath)
* @see ClassPool#appendClassPath(ClassPath)
* @see LoaderClassPath
*/
public class ClassClassPath implements ClassPath {
private Class thisClass;
/** Creates a search path.
*
* @param c the Class object used to obtain a class
* file. getResourceAsStream() is called on
* this object.
*/
public ClassClassPath(Class c) {
thisClass = c;
}
ClassClassPath() {
/* The value of thisClass was this.getClass() in early versions:
*
* thisClass = this.getClass();
*
* However, this made openClassfile() not search all the system
* class paths if scouter.javassist.jar is put in jre/lib/ext/
* (with JDK1.4).
*/
this(java.lang.Object.class);
}
/**
* Obtains a class file by getResourceAsStream().
*/
@Override
public InputStream openClassfile(String classname) throws NotFoundException {
String filename = '/' + classname.replace('.', '/') + ".class";
return thisClass.getResourceAsStream(filename);
}
/**
* Obtains the URL of the specified class file.
*
* @return null if the class file could not be found.
*/
@Override
public URL find(String classname) {
String filename = '/' + classname.replace('.', '/') + ".class";
return thisClass.getResource(filename);
}
@Override
public String toString() {
return thisClass.getName() + ".class";
}
}