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ClassLoader.java
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ClassLoader.java
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/*
* Copyright (C) 2014, United States Government, as represented by the
* Administrator of the National Aeronautics and Space Administration.
* All rights reserved.
*
* The Java Pathfinder core (jpf-core) platform is licensed under the
* Apache License, Version 2.0 (the "License"); you may not use this file except
* in compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0.
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package java.lang;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.nio.ByteBuffer;
import java.security.ProtectionDomain;
import java.util.Enumeration;
import java.util.Vector;
/**
* @author Nastaran Shafiei <nastaran.shafiei@gmail.com>
*
* Model class for java.lang.ClassLoader
*/
public abstract class ClassLoader {
private ClassLoader parent;
// This is JPF internal identifier which set to the globalId of the classLoader
private int nativeId;
//--- internals
protected ClassLoader() {
// constructed on the native side
}
protected ClassLoader (ClassLoader parent){
// constructed on the native side
}
private native String getResource0 (String rname);
public URL getResource(String name) {
URL url = null;
if(parent == null) {
String resourcePath = getSystemClassLoader().getResource0(name);
try {
url = new URL(resourcePath);
} catch (MalformedURLException x){
url = null;
}
} else {
url = parent.getResource(name);
}
if (url == null) {
url = findResource(name);
}
return url;
}
/**
* Finds the resource with the given name. Class loader implementations
* should override this method to specify where to find resources.
*/
protected URL findResource(String name) {
return null;
}
private native String[] getResources0 (String rname);
/**
* Returns an array of URL including all resources with the given name
* found in the classpath of this classloader.
*/
private Enumeration<URL> getResourcesURL(String name) {
String[] urls = getResources0(name);
Vector<URL> list = new Vector<URL>(0);
for(String url: urls) {
try {
list.add(new URL(url));
} catch (MalformedURLException x){
// process the rest
}
}
return list.elements();
}
@SuppressWarnings({"unchecked","rawtypes"})
public Enumeration<URL> getResources(String name) throws IOException {
Enumeration<URL>[] resEnum = new Enumeration[2];
if(parent == null) {
resEnum[0] = getSystemClassLoader().getResourcesURL(name);
} else{
resEnum[0] = parent.getResources(name);
}
resEnum[1] = findResources(name);
return new CompoundEnumeration<URL>(resEnum);
}
/**
* Returns an enumeration representing all the resources with the given
* name. Class loader implementations should override this method to
* specify where to load resources from.
*/
protected Enumeration<URL> findResources(String name) throws IOException {
return (new Vector<URL>()).elements();
}
public InputStream getResourceAsStream (String name){
URL foundResource = getResource(name);
if (foundResource != null) {
try {
return foundResource.openStream();
} catch (IOException e) {
System.err.println("cannot open resource " + name);
}
}
return null;
}
public native static ClassLoader getSystemClassLoader ();
public static URL getSystemResource(String name){
return getSystemClassLoader().getResource(name);
}
public static InputStream getSystemResourceAsStream(String name) {
return getSystemClassLoader().getResourceAsStream(name);
}
public static Enumeration<URL> getSystemResources(String name) throws IOException {
return getSystemClassLoader().getResources(name);
}
public ClassLoader getParent() {
return parent;
}
/**
* If the class with the given name has been already defined, it is returned. OW, it
* returns null.
*/
protected native final Class<?> findLoadedClass(String name);
protected native final Class<?> findSystemClass(String name) throws ClassNotFoundException;
public Class<?> loadClass(String name) throws ClassNotFoundException {
Class<?> c = findLoadedClass(name);
if(c == null) {
try {
if (parent != null && parent != getSystemClassLoader()) {
c = parent.loadClass(name, false);
} else {
c = findSystemClass(name);
}
} catch (ClassNotFoundException e) {
c = findClass(name);
}
}
return c;
}
protected Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
return loadClass(name);
}
/**
* Finds the class with a given name. This method should be overridden by
* ClassLoader subclasses, and it will be used by loadClass().
*/
protected Class<?> findClass(String name) throws ClassNotFoundException {
throw new ClassNotFoundException(name);
}
/**
* All the class objects are resolved internally by JPF. So this method
* does nothing.
*/
protected final void resolveClass(Class<?> c) {
}
private native Class<?> defineClass0(String name, byte[] b, int off, int len);
protected final Class<?> defineClass(String name, byte[] b, int off, int len) throws ClassFormatError {
return defineClass0(name, b, off, len);
}
protected final Class<?> defineClass(String name, byte[] b, int off, int len, ProtectionDomain protectionDomain) throws ClassFormatError {
return defineClass(name, b, off, len);
}
protected String findLibrary(String libname) {
return null;
}
protected native Package getPackage(String name);
protected native Package[] getPackages();
public native void setDefaultAssertionStatus(boolean enabled);
public native void setClassAssertionStatus(String className, boolean enabled);
public native void setPackageAssertionStatus(String packageName, boolean enabled);
public native void clearAssertionStatus();
//--- unsupported methods
protected static boolean registerAsParallelCapable() {
return true; // dummy, in prep for jdk7
}
protected Object getClassLoadingLock(String className) {
throw new UnsupportedOperationException();
}
protected final Class<?> defineClass(byte[] b, int off, int len)
throws ClassFormatError {
throw new UnsupportedOperationException();
}
protected final Class<?> defineClass(String name, ByteBuffer b, ProtectionDomain protectionDomain)
throws ClassFormatError {
throw new UnsupportedOperationException();
}
protected final void setSigners(Class<?> c, Object[] signers) {
throw new UnsupportedOperationException();
}
protected Package definePackage(String name, String specTitle, String specVersion,
String specVendor, String implTitle, String implVersion,
String implVendor, URL sealBase)
throws IllegalArgumentException {
throw new UnsupportedOperationException();
}
}