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/*
* 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 javassist;
import java.io.InputStream;
import java.lang.reflect.Layer;
import java.lang.reflect.Module;
import java.net.URL;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Set;
/**
* A search-path for obtaining a class file
* by <code>getResourceAsStream()</code> in <code>java.lang.reflect.Module</code>.
*
* @see ClassPool#insertClassPath(ClassPath)
* @see ClassPool#appendClassPath(ClassPath)
* @see LoaderClassPath
* @see ClassClassPath
*/
public class ModuleClassPath implements ClassPath {
private HashMap packages = new HashMap();
ModuleClassPath() { this(Layer.boot()); }
/**
* Constructs a search path.
*
* @param layer the layer used to obtain a class file.
*/
public ModuleClassPath(Layer layer) {
while (layer != null) {
Set modules = layer.modules();
Iterator it = modules.iterator();
while (it.hasNext())
addPackages((Module)it.next());
layer = layer.parent().orElse(null);
}
}
/**
* Constructs a search path.
*
* @param m the module used to obtain a class file.
*/
public ModuleClassPath(Module m) {
addPackages(m);
}
private void addPackages(Module m) {
String[] names = m.getPackages();
for (int i = 0; i < names.length; i++)
packages.put(names[i], m);
}
/**
* Obtains a class file by <code>getResourceAsStream()</code>.
*/
public InputStream openClassfile(String classname) throws NotFoundException {
String filename = classname.replace('.', '/') + ".class";
Module m = (Module)packages.get(getPackageName(classname));
if (m == null)
return null;
else
try {
return m.getResourceAsStream(filename);
}
catch (java.io.IOException e) {
throw new NotFoundException(classname, e);
}
}
/**
* Obtains the URL of the specified class file.
*
* @return null if the class file could not be found.
*/
public URL find(String classname) {
String filename = classname.replace('.', '/') + ".class";
Module m = (Module)packages.get(getPackageName(classname));
if (m == null)
return null;
else
try {
InputStream is = m.getResourceAsStream(filename);
if (is == null)
return null;
else {
is.close();
return new URL("jar:file:unknown.jar!/" + filename);
}
}
catch (java.io.IOException e) {
return null;
}
}
private static String getPackageName(String name) {
int i = name.lastIndexOf('.');
if (i > 0)
return name.substring(0, i);
else
return "";
}
/**
* Does nothing.
*/
public void close() {}
}
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