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AspectJ tools most notably contains the AspectJ compiler (AJC). AJC applies aspects to Java classes during
compilation, fully replacing Javac for plain Java classes and also compiling native AspectJ or annotation-based
@AspectJ syntax. Furthermore, AJC can weave aspects into existing class files in a post-compile binary weaving step.
This library is a superset of AspectJ weaver and hence also of AspectJ runtime.
/*******************************************************************************
* Copyright (c) 2005, 2021 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.osgi.internal.loader.classpath;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Enumeration;
import java.util.List;
import java.util.ListIterator;
import java.util.NoSuchElementException;
import org.eclipse.osgi.container.Module;
import org.eclipse.osgi.container.ModuleCapability;
import org.eclipse.osgi.container.ModuleContainerAdaptor.ContainerEvent;
import org.eclipse.osgi.container.ModuleRevision;
import org.eclipse.osgi.container.ModuleWire;
import org.eclipse.osgi.container.namespaces.EquinoxModuleDataNamespace;
import org.eclipse.osgi.framework.util.ArrayMap;
import org.eclipse.osgi.internal.debug.Debug;
import org.eclipse.osgi.internal.framework.EquinoxConfiguration;
import org.eclipse.osgi.internal.hookregistry.ClassLoaderHook;
import org.eclipse.osgi.internal.hookregistry.HookRegistry;
import org.eclipse.osgi.internal.loader.ModuleClassLoader;
import org.eclipse.osgi.internal.loader.ModuleClassLoader.DefineClassResult;
import org.eclipse.osgi.internal.messages.Msg;
import org.eclipse.osgi.internal.weaving.WeavingHookConfigurator;
import org.eclipse.osgi.storage.BundleInfo.Generation;
import org.eclipse.osgi.storage.NativeCodeFinder;
import org.eclipse.osgi.storage.Storage;
import org.eclipse.osgi.storage.bundlefile.BundleEntry;
import org.eclipse.osgi.storage.bundlefile.BundleFile;
import org.eclipse.osgi.util.NLS;
import org.osgi.framework.BundleException;
import org.osgi.framework.namespace.HostNamespace;
/**
* A helper class for {@link ModuleClassLoader} implementations. This class will keep track of
* {@link ClasspathEntry} objects for the host bundle and any attached fragment bundles. This
* class takes care of searching the {@link ClasspathEntry} objects for a module class loader
* implementation. Additional behavior may be added to a classpath manager by configuring a
* {@link ClassLoaderHook}.
* @see ModuleClassLoader
* @see ClassLoaderHook
* @since 3.2
*/
public class ClasspathManager {
private static final FragmentClasspath[] emptyFragments = new FragmentClasspath[0];
private static final String[] DEFAULT_CLASSPATH = new String[] {"."}; //$NON-NLS-1$
private final Generation generation;
private final ModuleClassLoader classloader;
private final HookRegistry hookRegistry;
private final Debug debug;
// TODO Note that PDE has internal dependency on this field type/name (bug 267238)
private final ClasspathEntry[] entries;
// TODO Note that PDE has internal dependency on this field type/name (bug 267238)
private volatile FragmentClasspath[] fragments;
// a Map where "libname" is the key and libpath" is the value
private ArrayMap loadedLibraries = null;
// used to detect recusive defineClass calls for the same class on the same class loader (bug 345500)
private ThreadLocal currentDefineContext = new ThreadLocal<>();
/**
* Constructs a classpath manager for the given generation and module class loader
* @param generation the host generation for this classpath manager
* @param classloader the ModuleClassLoader for this classpath manager
*/
public ClasspathManager(Generation generation, ModuleClassLoader classloader) {
EquinoxConfiguration configuration = generation.getBundleInfo().getStorage().getConfiguration();
this.debug = configuration.getDebug();
this.hookRegistry = configuration.getHookRegistry();
this.generation = generation;
this.classloader = classloader;
String[] cp = getClassPath(generation.getRevision());
this.fragments = buildFragmentClasspaths(this.classloader, this);
this.entries = buildClasspath(cp, this, this.generation);
}
private static String[] getClassPath(ModuleRevision revision) {
List moduleDatas = revision.getModuleCapabilities(EquinoxModuleDataNamespace.MODULE_DATA_NAMESPACE);
@SuppressWarnings("unchecked")
List cp = moduleDatas.isEmpty() ? null : (List) moduleDatas.get(0).getAttributes().get(EquinoxModuleDataNamespace.CAPABILITY_CLASSPATH);
return cp == null ? DEFAULT_CLASSPATH : cp.toArray(new String[cp.size()]);
}
private FragmentClasspath[] buildFragmentClasspaths(ModuleClassLoader hostloader, ClasspathManager manager) {
if (hostloader == null) {
return emptyFragments;
}
List fragmentWires = hostloader.getBundleLoader().getWiring().getProvidedModuleWires(HostNamespace.HOST_NAMESPACE);
if (fragmentWires == null || fragmentWires.isEmpty()) {
// we don't hold locks while checking the graph, just return if no longer valid
return emptyFragments;
}
List result = new ArrayList<>(fragmentWires.size());
for (ModuleWire fragmentWire : fragmentWires) {
ModuleRevision revision = fragmentWire.getRequirer();
Generation fragGeneration = (Generation) revision.getRevisionInfo();
String[] cp = getClassPath(revision);
ClasspathEntry[] fragEntries = buildClasspath(cp, manager, fragGeneration);
FragmentClasspath fragClasspath = new FragmentClasspath(fragGeneration, fragEntries);
insertFragment(fragClasspath, result);
}
return result.toArray(new FragmentClasspath[result.size()]);
}
private static void insertFragment(FragmentClasspath fragClasspath, List existing) {
// Find a place in the fragment list to insert this fragment.
long fragID = fragClasspath.getGeneration().getRevision().getRevisions().getModule().getId();
for (ListIterator iExisting = existing.listIterator(); iExisting.hasNext();) {
long otherID = iExisting.next().getGeneration().getRevision().getRevisions().getModule().getId();
if (fragID < otherID) {
iExisting.previous();
iExisting.add(fragClasspath);
return;
}
}
existing.add(fragClasspath);
}
/**
* Closes all the classpath entry resources for this classpath manager.
*
*/
public void close() {
for (ClasspathEntry entry : entries) {
if (entry != null) {
try {
entry.close();
}catch (IOException e) {
generation.getBundleInfo().getStorage().getAdaptor().publishContainerEvent(ContainerEvent.ERROR, generation.getRevision().getRevisions().getModule(), e);
}
}
}
FragmentClasspath[] currentFragments = getFragmentClasspaths();
for (FragmentClasspath currentFragment : currentFragments) {
currentFragment.close();
}
}
private ClasspathEntry[] buildClasspath(String[] cp, ClasspathManager hostloader, Generation source) {
ArrayList result = new ArrayList<>(cp.length);
// add the regular classpath entries.
for (String cpEntry : cp) {
findClassPathEntry(result, cpEntry, hostloader, source);
}
return result.toArray(new ClasspathEntry[result.size()]);
}
/**
* Finds all the ClasspathEntry objects for the requested classpath. This method will first call all
* the configured class loading hooks {@link ClassLoaderHook#addClassPathEntry(ArrayList, String, ClasspathManager, Generation)}
* methods. This allows class loading hooks to add additional ClasspathEntry objects to the result for the
* requested classpath. Then the local host classpath entries and attached fragment classpath entries are
* searched.
* @param result a list of ClasspathEntry objects. This list is used to add new ClasspathEntry objects to.
* @param cp the requested classpath.
* @param hostloader the host classpath manager for the classpath
* @param sourceGeneration the source generation to search for the classpath
*/
private void findClassPathEntry(ArrayList result, String cp, ClasspathManager hostloader, Generation sourceGeneration) {
List loaderHooks = hookRegistry.getClassLoaderHooks();
boolean hookAdded = false;
for (ClassLoaderHook hook : loaderHooks) {
hookAdded |= hook.addClassPathEntry(result, cp, hostloader, sourceGeneration);
}
if (!addClassPathEntry(result, cp, hostloader, sourceGeneration) && !hookAdded) {
BundleException be = new BundleException(NLS.bind(Msg.BUNDLE_CLASSPATH_ENTRY_NOT_FOUND_EXCEPTION, cp, sourceGeneration.getRevision().toString()), BundleException.MANIFEST_ERROR);
sourceGeneration.getBundleInfo().getStorage().getAdaptor().publishContainerEvent(ContainerEvent.INFO, sourceGeneration.getRevision().getRevisions().getModule(), be);
}
}
/**
* Adds a ClasspathEntry for the requested classpath to the result. The local host classpath entries
* are searched first and then attached fragments classpath entries are searched. The search stops once the first
* classpath entry is found.
* @param result a list of ClasspathEntry objects. This list is used to add new ClasspathEntry objects to.
* @param cp the requested classpath.
* @param hostManager the host classpath manager for the classpath
* @param source the source generation to search for the classpath
* @return true if a ClasspathEntry was added to the result
*/
public boolean addClassPathEntry(ArrayList result, String cp, ClasspathManager hostManager, Generation source) {
return addStandardClassPathEntry(result, cp, hostManager, source) || addEclipseClassPathEntry(result, cp, hostManager, source);
}
public static boolean addStandardClassPathEntry(ArrayList result, String cp, ClasspathManager hostManager, Generation generation) {
if (cp.equals(".")) { //$NON-NLS-1$
result.add(hostManager.createClassPathEntry(generation.getBundleFile(), generation));
return true;
}
ClasspathEntry element = hostManager.getClasspath(cp, generation);
if (element != null) {
result.add(element);
return true;
}
// need to check in fragments for the classpath entry.
// only check for fragments if the generation is the host's generation.
if (hostManager.generation == generation) {
FragmentClasspath[] hostFrags = hostManager.getFragmentClasspaths();
for (FragmentClasspath fragCP : hostFrags) {
element = hostManager.getClasspath(cp, fragCP.getGeneration());
if (element != null) {
result.add(element);
return true;
}
}
}
return false;
}
private boolean addEclipseClassPathEntry(ArrayList result, String cp, ClasspathManager hostManager, Generation source) {
String var = hasPrefix(cp);
if (var != null)
// find internal library using eclipse predefined vars
return addInternalClassPath(var, result, cp, hostManager, source);
if (cp.startsWith(NativeCodeFinder.EXTERNAL_LIB_PREFIX)) {
cp = cp.substring(NativeCodeFinder.EXTERNAL_LIB_PREFIX.length());
// find external library using system property substitution
ClasspathEntry cpEntry = hostManager.getExternalClassPath(source.getBundleInfo().getStorage().getConfiguration().substituteVars(cp), source);
if (cpEntry != null) {
result.add(cpEntry);
return true;
}
}
return false;
}
private boolean addInternalClassPath(String var, ArrayList cpEntries, String cp, ClasspathManager hostManager, Generation source) {
EquinoxConfiguration configuration = source.getBundleInfo().getStorage().getConfiguration();
if (var.equals("ws")) //$NON-NLS-1$
return ClasspathManager.addStandardClassPathEntry(cpEntries, "ws/" + configuration.getWS() + cp.substring(4), hostManager, source); //$NON-NLS-1$
if (var.equals("os")) //$NON-NLS-1$
return ClasspathManager.addStandardClassPathEntry(cpEntries, "os/" + configuration.getOS() + cp.substring(4), hostManager, source); //$NON-NLS-1$
if (var.equals("nl")) { //$NON-NLS-1$
cp = cp.substring(4);
List NL_JAR_VARIANTS = source.getBundleInfo().getStorage().getConfiguration().ECLIPSE_NL_JAR_VARIANTS;
for (String nlVariant : NL_JAR_VARIANTS) {
if (ClasspathManager.addStandardClassPathEntry(cpEntries, "nl/" + nlVariant + cp, hostManager, source)) //$NON-NLS-1$
return true;
}
}
return false;
}
//return a String representing the string found between the $s
private static String hasPrefix(String libPath) {
if (libPath.startsWith("$ws$")) //$NON-NLS-1$
return "ws"; //$NON-NLS-1$
if (libPath.startsWith("$os$")) //$NON-NLS-1$
return "os"; //$NON-NLS-1$
if (libPath.startsWith("$nl$")) //$NON-NLS-1$
return "nl"; //$NON-NLS-1$
return null;
}
/**
* Creates a new ClasspathEntry object for the requested classpath if the source exists.
* @param cp the requested classpath.
* @param cpGeneration the source generation to search for the classpath
* @return a new ClasspathEntry for the requested classpath or null if the source does not exist.
*/
public ClasspathEntry getClasspath(String cp, Generation cpGeneration) {
BundleFile bundlefile = null;
File file;
BundleEntry cpEntry = cpGeneration.getBundleFile().getEntry(cp);
// check for internal library directories in a bundle jar file
if (cpEntry != null && cpEntry.getName().endsWith("/")) //$NON-NLS-1$
bundlefile = createBundleFile(cp, cpGeneration);
// check for internal library jars
else if ((file = cpGeneration.getBundleFile().getFile(cp, false)) != null)
bundlefile = createBundleFile(file, cpGeneration);
if (bundlefile != null)
return createClassPathEntry(bundlefile, cpGeneration);
return null;
}
/**
* Uses the requested classpath as an absolute path to locate a source for a new ClasspathEntry.
* @param cp the requested classpath
* @param cpGeneration the source generation to search for the classpath
* @return a classpath entry which uses an absolut path as a source
*/
public ClasspathEntry getExternalClassPath(String cp, Generation cpGeneration) {
File file = new File(cp);
if (!file.isAbsolute())
return null;
BundleFile bundlefile = createBundleFile(file, cpGeneration);
if (bundlefile != null)
return createClassPathEntry(bundlefile, cpGeneration);
return null;
}
public synchronized void loadFragments(Collection addedFragments) {
List result = new ArrayList<>(Arrays.asList(fragments));
for (ModuleRevision addedFragment : addedFragments) {
Generation fragGeneration = (Generation) addedFragment.getRevisionInfo();
String[] cp = getClassPath(addedFragment);
ClasspathEntry[] fragEntries = buildClasspath(cp, this, fragGeneration);
FragmentClasspath fragClasspath = new FragmentClasspath(fragGeneration, fragEntries);
insertFragment(fragClasspath, result);
}
fragments = result.toArray(new FragmentClasspath[result.size()]);
}
private static BundleFile createBundleFile(File content, Generation generation) {
if (!content.exists()) {
return null;
}
return generation.getBundleInfo().getStorage().createBundleFile(content, generation, content.isDirectory(), false);
}
private static BundleFile createBundleFile(String nestedDir, Generation generation) {
return generation.getBundleInfo().getStorage().createNestedBundleFile(nestedDir, generation.getBundleFile(), generation);
}
private ClasspathEntry createClassPathEntry(BundleFile bundlefile, Generation source) {
ClasspathEntry entry;
if (classloader != null)
entry = classloader.createClassPathEntry(bundlefile, source);
else
entry = new ClasspathEntry(bundlefile, source.getDomain(), source);
return entry;
}
/**
* Finds a local resource by searching the ClasspathEntry objects of the classpath manager.
* This method will first call all the configured class loading hooks
* {@link ClassLoaderHook#preFindLocalResource(String, ClasspathManager)} methods. Then it
* will search for the resource. Finally it will call all the configured class loading hooks
* {@link ClassLoaderHook#postFindLocalResource(String, URL, ClasspathManager)} methods.
* @param resource the requested resource name.
* @return the requested resource URL or null if the resource does not exist
*/
public URL findLocalResource(String resource) {
List hooks = hookRegistry.getClassLoaderHooks();
boolean hookFailed = false;
for (ClassLoaderHook hook : hooks) {
try {
hook.preFindLocalResource(resource, this);
} catch (NoSuchElementException e) {
// mark the resource load as failed, but continue to all the hooks
hookFailed = true;
}
}
URL result = null;
try {
if (!hookFailed) {
result = findLocalResourceImpl(resource, -1);
}
} finally {
for (ClassLoaderHook hook : hooks) {
try {
hook.postFindLocalResource(resource, result, this);
} catch (NoSuchElementException e) {
result = null;
}
}
}
return result;
}
private URL findLocalResourceImpl(String resource, int classPathIndex) {
Module m = generation.getRevision().getRevisions().getModule();
URL result = null;
int[] curIndex = {0};
// look in hook specific entries if any
for (ClassLoaderHook hook : hookRegistry.getClassLoaderHooks()) {
ClasspathEntry[] hookEntries = hook.getClassPathEntries(resource, this);
if (hookEntries != null) {
return findLocalResourceImpl(resource, hookEntries, m, classPathIndex, curIndex);
}
}
curIndex[0] = 0;
// look in classpath entries
result = findLocalResourceImpl(resource, entries, m, classPathIndex, curIndex);
if (result != null) {
return result;
}
// look in fragment entries
for (FragmentClasspath fragCP : getFragmentClasspaths()) {
result = findLocalResourceImpl(resource, fragCP.getEntries(), m, classPathIndex, curIndex);
if (result != null) {
return result;
}
}
return null;
}
private URL findLocalResourceImpl(String resource, ClasspathEntry[] cpEntries, Module m, int classPathIndex, int[] curIndex) {
URL result;
for (ClasspathEntry cpEntry : cpEntries) {
if (cpEntry != null) {
result = cpEntry.findResource(resource, m, curIndex[0]);
if (result != null && (classPathIndex == -1 || classPathIndex == curIndex[0])) {
return result;
}
}
curIndex[0]++;
}
return null;
}
/**
* Finds the local resources by searching the ClasspathEntry objects of the classpath manager.
* @param resource the requested resource name.
* @return an enumeration of the the requested resources
*/
public Enumeration findLocalResources(String resource) {
Module m = generation.getRevision().getRevisions().getModule();
List resources = new ArrayList<>(6);
int[] classPathIndex = {0};
// look in hook specific entries if any
for (ClassLoaderHook hook : hookRegistry.getClassLoaderHooks()) {
ClasspathEntry[] hookEntries = hook.getClassPathEntries(resource, this);
if (hookEntries != null) {
findLocalResources(resource, hookEntries, m, classPathIndex, resources);
return resources.size() > 0 ? Collections.enumeration(resources) : Collections.emptyEnumeration();
}
}
classPathIndex[0] = 0;
// look in host classpath entries
findLocalResources(resource, entries, m, classPathIndex, resources);
// look in fragment entries
for (FragmentClasspath fragCP : getFragmentClasspaths()) {
findLocalResources(resource, fragCP.getEntries(), m, classPathIndex, resources);
}
if (resources.size() > 0)
return Collections.enumeration(resources);
return Collections.emptyEnumeration();
}
private void findLocalResources(String resource, ClasspathEntry[] cpEntries, Module m, int[] classPathIndex, List resources) {
for (ClasspathEntry cpEntry : cpEntries) {
if (cpEntry != null) {
URL url = cpEntry.findResource(resource, m, classPathIndex[0]);
if (url != null) {
resources.add(url);
}
}
classPathIndex[0]++;
}
}
/**
* Finds a local entry by searching the ClasspathEntry objects of the classpath manager.
* @param path the requested entry path.
* @return the requested entry or null if the entry does not exist
*/
public BundleEntry findLocalEntry(String path) {
return findLocalEntry(path, -1);
}
/**
* Finds a local entry by searching the ClasspathEntry with the specified
* class path index.
* @param path the requested entry path.
* @param classPathIndex the index of the ClasspathEntry to search
* @return the requested entry or null if the entry does not exist
*/
public BundleEntry findLocalEntry(String path, int classPathIndex) {
BundleEntry result = null;
int[] curIndex = {0};
// look in hook specific entries if any
for (ClassLoaderHook hook : hookRegistry.getClassLoaderHooks()) {
ClasspathEntry[] hookEntries = hook.getClassPathEntries(path, this);
if (hookEntries != null) {
return findLocalEntry(path, hookEntries, classPathIndex, curIndex);
}
}
curIndex[0] = 0;
// look in classpath entries
result = findLocalEntry(path, entries, classPathIndex, curIndex);
if (result != null) {
return result;
}
// look in fragment entries
for (FragmentClasspath fragCP : getFragmentClasspaths()) {
result = findLocalEntry(path, fragCP.getEntries(), classPathIndex, curIndex);
if (result != null) {
return result;
}
}
return null;
}
private BundleEntry findLocalEntry(String path, ClasspathEntry[] cpEntries, int classPathIndex, int[] curIndex) {
for (ClasspathEntry cpEntry : cpEntries) {
if (cpEntry != null) {
if (classPathIndex == -1 || classPathIndex == curIndex[0]) {
BundleEntry result = cpEntry.findEntry(path);
if (result != null) {
return result;
}
}
}
curIndex[0]++;
}
return null;
}
/**
* Finds a local class by searching the ClasspathEntry objects of the classpath manager.
* This method will first call all the configured class loader hooks
* {@link ClassLoaderHook#preFindLocalClass(String, ClasspathManager)} methods. Then it
* will search for the class. If a class is found then
*
* - All configured class loader hooks
* {@link ClassLoaderHook#processClass(String, byte[], ClasspathEntry, BundleEntry, ClasspathManager)}
* methods will be called.
* - The class is then defined.
* - Finally, all configured class loading
* stats hooks {@link ClassLoaderHook#recordClassDefine(String, Class, byte[], ClasspathEntry, BundleEntry, ClasspathManager)}
* methods are called.
*
* Finally all the configured class loading hooks
* {@link ClassLoaderHook#postFindLocalClass(String, Class, ClasspathManager)} methods are called.
* @param classname the requested class name.
* @return the requested class or null if the class does not exist
* @throws ClassNotFoundException if a ClassLoaderHook prevents the requested class from loading
*/
public Class findLocalClass(String classname) throws ClassNotFoundException {
Class result = null;
List hooks = hookRegistry.getClassLoaderHooks();
try {
for (ClassLoaderHook hook : hooks) {
hook.preFindLocalClass(classname, this);
}
result = classloader.publicFindLoaded(classname);
if (result != null)
return result;
result = findLocalClassImpl(classname, hooks);
return result;
} finally {
for (ClassLoaderHook hook : hooks) {
hook.postFindLocalClass(classname, result, this);
}
}
}
private Class findLocalClassImpl(String classname, List hooks) {
Class result;
// look in hook specific entries if any
for (ClassLoaderHook hook : hookRegistry.getClassLoaderHooks()) {
ClasspathEntry[] hookEntries = hook.getClassPathEntries(classname, this);
if (hookEntries != null) {
return findLocalClassImpl(classname, hookEntries, hooks);
}
}
// look in classpath entries
result = findLocalClassImpl(classname, entries, hooks);
if (result != null) {
return result;
}
// look in fragment entries
for (FragmentClasspath fragCP : getFragmentClasspaths()) {
result = findLocalClassImpl(classname, fragCP.getEntries(), hooks);
if (result != null) {
return result;
}
}
return null;
}
private Class findLocalClassImpl(String classname, ClasspathEntry[] cpEntries, List hooks) {
Class result;
for (ClasspathEntry cpEntry : cpEntries) {
if (cpEntry != null) {
result = findClassImpl(classname, cpEntry, hooks);
if (result != null) {
return result;
}
}
}
return null;
}
private Class findClassImpl(String name, ClasspathEntry classpathEntry, List hooks) {
if (debug.DEBUG_LOADER)
Debug.println("ModuleClassLoader[" + classloader.getBundleLoader() + " - " + classpathEntry.getBundleFile() + "].findClassImpl(" + name + ")"); //$NON-NLS-1$ //$NON-NLS-2$//$NON-NLS-3$ //$NON-NLS-4$
String filename = name.replace('.', '/').concat(".class"); //$NON-NLS-1$
BundleEntry entry = classpathEntry.findEntry(filename);
if (entry == null)
return null;
byte[] classbytes;
try {
classbytes = entry.getBytes();
} catch (IOException e) {
if (debug.DEBUG_LOADER)
Debug.println(" IOException reading " + filename + " from " + classpathEntry.getBundleFile()); //$NON-NLS-1$ //$NON-NLS-2$
throw (LinkageError) new LinkageError("Error reading class bytes: " + name).initCause(e); //$NON-NLS-1$
}
if (debug.DEBUG_LOADER) {
Debug.println(" read " + classbytes.length + " bytes from " + classpathEntry.getBundleFile() + "!/" + filename); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
Debug.println(" defining class " + name); //$NON-NLS-1$
}
try {
return defineClass(name, classbytes, classpathEntry, entry, hooks);
} catch (Error e) {
if (debug.DEBUG_LOADER)
Debug.println(" error defining class " + name); //$NON-NLS-1$
throw e;
}
}
static class DefineContext {
Collection currentlyProcessing = new ArrayList<>(5);
Collection currentlyDefining = new ArrayList<>(5);
}
/**
* Defines the specified class. This method will first call all the configured class loader hooks
* {@link ClassLoadingHook#processClass(String, byte[], ClasspathEntry, BundleEntry, ClasspathManager)}
* methods. If any hook modifies the bytes the all configured hook
* {@link ClassLoaderHook#rejectTransformation(String, byte[], ClasspathEntry, BundleEntry, ClasspathManager)}
* methods are called. Then it will call the {@link ModuleClassLoader#defineClass(String, byte[], ClasspathEntry, BundleEntry)}
* method to define the class. After that, the class loader hooks are called to announce the class
* definition by calling {@link ClassLoaderHook#recordClassDefine(String, Class, byte[], ClasspathEntry, BundleEntry, ClasspathManager)}.
* @param name the name of the class to define
* @param classbytes the class bytes
* @param classpathEntry the classpath entry used to load the class bytes
* @param entry the BundleEntry used to load the class bytes
* @param hooks the class loader hooks
* @return the defined class
*/
private Class defineClass(String name, byte[] classbytes, ClasspathEntry classpathEntry, BundleEntry entry, List hooks) {
DefineClassResult result = null;
boolean recursionDetected = false;
try {
definePackage(name, classpathEntry);
DefineContext context = currentDefineContext.get();
if (context == null) {
context = new DefineContext();
currentDefineContext.set(context);
}
// First call the hooks that do not handle recursion themselves
if (!hookRegistry.getContainer().isProcessClassRecursionSupportedByAll()) {
// One or more hooks do not support recursive class processing.
// We need to detect recursions for this set of hooks.
if (context.currentlyProcessing.contains(name)) {
// Avoid recursion for the same class name for these hooks
recursionDetected = true;
// TODO consider thrown a ClassCircularityError here
return null;
}
context.currentlyProcessing.add(name);
try {
for (ClassLoaderHook hook : hooks) {
if (!hook.isProcessClassRecursionSupported()) {
classbytes = processClass(hook, name, classbytes, classpathEntry, entry, this, hooks);
}
}
} finally {
context.currentlyProcessing.remove(name);
}
}
// Now call the hooks that do support recursion without the check.
for (ClassLoaderHook hook : hooks) {
if (hook.isProcessClassRecursionSupported()) {
// Note if the hooks don't take protective measures for a recursive class load here
// it will result in a stack overflow.
classbytes = processClass(hook, name, classbytes, classpathEntry, entry, this, hooks);
}
}
if (context.currentlyDefining.contains(name)) {
// TODO consider thrown a ClassCircularityError here
return null; // avoid recursive defines (bug 345500)
}
context.currentlyDefining.add(name);
try {
result = classloader.defineClass(name, classbytes, classpathEntry);
} finally {
context.currentlyDefining.remove(name);
}
} finally {
// only call hooks if we properly called processClass above
if (!recursionDetected) {
// only pass the newly defined class to the hook
Class defined = result != null && result.defined ? result.clazz : null;
for (ClassLoaderHook hook : hooks) {
hook.recordClassDefine(name, defined, classbytes, classpathEntry, entry, this);
}
}
}
// return either the pre-loaded class or the newly defined class
return result == null ? null : result.clazz;
}
private byte[] processClass(ClassLoaderHook hook, String name, byte[] classbytes, ClasspathEntry classpathEntry, BundleEntry entry, ClasspathManager classpathManager, List hooks) {
byte[] modifiedBytes = hook.processClass(name, classbytes, classpathEntry, entry, this);
if (modifiedBytes != null) {
// the WeavingHookConfigurator already calls the rejectTransformation method; avoid calling it again.
if (!(hook instanceof WeavingHookConfigurator)) {
for (ClassLoaderHook rejectHook : hooks) {
if (rejectHook.rejectTransformation(name, modifiedBytes, classpathEntry, entry, this)) {
modifiedBytes = null;
break;
}
}
}
if (modifiedBytes != null) {
classbytes = modifiedBytes;
}
}
return classbytes;
}
private void definePackage(String name, ClasspathEntry classpathEntry) {
// Define the package if it is not the default package.
int lastIndex = name.lastIndexOf('.');
if (lastIndex < 0) {
return;
}
String packageName = name.substring(0, lastIndex);
Object pkg = classloader.publicGetPackage(packageName);
if (pkg != null) {
return;
}
// get info about the package from the classpath entry's manifest.
String specTitle = null, specVersion = null, specVendor = null, implTitle = null, implVersion = null, implVendor = null;
if (generation.getBundleInfo().getStorage().getConfiguration().DEFINE_PACKAGE_ATTRIBUTES) {
ManifestPackageAttributes manifestPackageAttributes = classpathEntry.manifestPackageAttributesFor(packageName);
TitleVersionVendor specification = manifestPackageAttributes.getSpecification();
TitleVersionVendor implementation = manifestPackageAttributes.getImplementation();
specTitle = specification.getTitle();
specVersion = specification.getVersion();
specVendor = specification.getVendor();
implTitle = implementation.getTitle();
implVersion = implementation.getVersion();
implVendor = implementation.getVendor();
}
// The package is not defined yet define it before we define the class.
// TODO still need to seal packages.
classloader.publicDefinePackage(packageName, specTitle, specVersion, specVendor, implTitle, implVersion, implVendor, null);
}
/**
* Returns the fragment classpaths of this classpath manager
* @return the fragment classpaths of this classpath manager
*/
public FragmentClasspath[] getFragmentClasspaths() {
return fragments;
}
/**
* Returns the host classpath entries for this classpath manager
* @return the host classpath entries for this classpath manager
*/
public ClasspathEntry[] getHostClasspathEntries() {
return entries;
}
/**
* Finds a library for the bundle represented by this class path manager
* @param libname the library name
* @return The absolution path to the library or null if not found
*/
public String findLibrary(String libname) {
synchronized (this) {
if (loadedLibraries == null)
loadedLibraries = new ArrayMap<>(1);
}
synchronized (loadedLibraries) {
// we assume that each classloader will load a small number of of libraries
// instead of wasting space with a map we iterate over our collection of found libraries
// each element is a String[2], each array is {"libname", "libpath"}
String libpath = loadedLibraries.get(libname);
if (libpath != null)
return libpath;
libpath = findLibrary0(libname);
if (libpath != null)
loadedLibraries.put(libname, libpath);
return libpath;
}
}
private String findLibrary0(String libname) {
List hooks = hookRegistry.getClassLoaderHooks();
String result = null;
for (ClassLoaderHook hook : hooks) {
try {
result = hook.preFindLibrary(libname, classloader);
if (result != null) {
return result;
}
} catch (FileNotFoundException e) {
return null;
}
}
result = generation.findLibrary(libname);
if (result != null) {
return result;
}
// look in fragment generations
FragmentClasspath[] currentFragments = getFragmentClasspaths();
for (FragmentClasspath fragment : currentFragments) {
result = fragment.getGeneration().findLibrary(libname);
if (result != null) {
return result;
}
}
for (ClassLoaderHook hook : hooks) {
result = hook.postFindLibrary(libname, classloader);
if (result != null) {
return result;
}
}
return result;
}
/**
* @see ModuleClassLoader#findEntries(String, String, int)
*/
public List findEntries(String path, String filePattern, int options) {
List generations = new ArrayList<>();
// first get the host bundle file
generations.add(generation);
// next get the attached fragments bundle files
FragmentClasspath[] currentFragments = getFragmentClasspaths();
for (FragmentClasspath fragmentClasspath : currentFragments)
generations.add(fragmentClasspath.getGeneration());
// now search over all the bundle files
Enumeration eURLs = Storage.findEntries(generations, path, filePattern, options);
if (eURLs == null)
return Collections.emptyList();
return Collections.unmodifiableList(Collections.list(eURLs));
}
/**
* @see ModuleClassLoader#listLocalResources(String, String, int)
*/
public Collection listLocalResources(String path, String filePattern, int options) {
List bundleFiles = new ArrayList<>();
// look for path first in hook specific entries if any
for (ClassLoaderHook hook : hookRegistry.getClassLoaderHooks()) {
ClasspathEntry[] hookEntries = hook.getClassPathEntries(path, this);
if (hookEntries != null) {
for (ClasspathEntry cpEntry : hookEntries) {
cpEntry.addBundleFiles(bundleFiles);
}
return Storage.listEntryPaths(bundleFiles, path, filePattern, options);
}
}
ClasspathEntry[] cpEntries = getHostClasspathEntries();
for (ClasspathEntry cpEntry : cpEntries) {
cpEntry.addBundleFiles(bundleFiles);
}
for (FragmentClasspath fragmentClasspath : getFragmentClasspaths()) {
for (ClasspathEntry cpEntry : fragmentClasspath.getEntries()) {
cpEntry.addBundleFiles(bundleFiles);
}
}
return Storage.listEntryPaths(bundleFiles, path, filePattern, options);
}
public Generation getGeneration() {
return generation;
}
public ModuleClassLoader getClassLoader() {
return classloader;
}
}