diff -r 484416f2dc2c -r 0a582b5a2737 emul/src/main/java/java/lang/ClassLoader.java --- a/emul/src/main/java/java/lang/ClassLoader.java Tue Oct 30 08:27:04 2012 +0100 +++ b/emul/src/main/java/java/lang/ClassLoader.java Tue Oct 30 09:24:41 2012 +0100 @@ -26,38 +26,9 @@ import java.io.InputStream; import java.io.IOException; -import java.io.File; -import java.lang.reflect.Constructor; -import java.lang.reflect.InvocationTargetException; -import java.net.MalformedURLException; import java.net.URL; -import java.security.AccessController; -import java.security.AccessControlContext; -import java.security.CodeSource; -import java.security.Policy; -import java.security.PrivilegedAction; -import java.security.PrivilegedActionException; -import java.security.PrivilegedExceptionAction; -import java.security.ProtectionDomain; -import java.security.cert.Certificate; -import java.util.Collections; import java.util.Enumeration; -import java.util.HashMap; -import java.util.HashSet; -import java.util.Set; -import java.util.Stack; -import java.util.Map; -import java.util.Vector; -import java.util.Hashtable; -import java.util.WeakHashMap; -import java.util.concurrent.ConcurrentHashMap; -import sun.misc.ClassFileTransformer; -import sun.misc.CompoundEnumeration; -import sun.misc.Resource; -import sun.misc.URLClassPath; -import sun.misc.VM; -import sun.reflect.Reflection; -import sun.security.util.SecurityConstants; +import java.util.NoSuchElementException; /** * A class loader is an object that is responsible for loading classes. The @@ -186,111 +157,6 @@ // must be added *after* it. private final ClassLoader parent; - /** - * Encapsulates the set of parallel capable loader types. - */ - private static class ParallelLoaders { - private ParallelLoaders() {} - - // the set of parallel capable loader types - private static final Set> loaderTypes = - Collections.newSetFromMap( - new WeakHashMap, Boolean>()); - static { - synchronized (loaderTypes) { loaderTypes.add(ClassLoader.class); } - } - - /** - * Registers the given class loader type as parallel capabale. - * Returns {@code true} is successfully registered; {@code false} if - * loader's super class is not registered. - */ - static boolean register(Class c) { - synchronized (loaderTypes) { - if (loaderTypes.contains(c.getSuperclass())) { - // register the class loader as parallel capable - // if and only if all of its super classes are. - // Note: given current classloading sequence, if - // the immediate super class is parallel capable, - // all the super classes higher up must be too. - loaderTypes.add(c); - return true; - } else { - return false; - } - } - } - - /** - * Returns {@code true} if the given class loader type is - * registered as parallel capable. - */ - static boolean isRegistered(Class c) { - synchronized (loaderTypes) { - return loaderTypes.contains(c); - } - } - } - - // Maps class name to the corresponding lock object when the current - // class loader is parallel capable. - // Note: VM also uses this field to decide if the current class loader - // is parallel capable and the appropriate lock object for class loading. - private final ConcurrentHashMap parallelLockMap; - - // Hashtable that maps packages to certs - private final Map package2certs; - - // Shared among all packages with unsigned classes - private static final Certificate[] nocerts = new Certificate[0]; - - // The classes loaded by this class loader. The only purpose of this table - // is to keep the classes from being GC'ed until the loader is GC'ed. - private final Vector> classes = new Vector<>(); - - // The "default" domain. Set as the default ProtectionDomain on newly - // created classes. - private final ProtectionDomain defaultDomain = - new ProtectionDomain(new CodeSource(null, (Certificate[]) null), - null, this, null); - - // The initiating protection domains for all classes loaded by this loader - private final Set domains; - - // Invoked by the VM to record every loaded class with this loader. - void addClass(Class c) { - classes.addElement(c); - } - - // The packages defined in this class loader. Each package name is mapped - // to its corresponding Package object. - // @GuardedBy("itself") - private final HashMap packages = new HashMap<>(); - - private static Void checkCreateClassLoader() { - SecurityManager security = System.getSecurityManager(); - if (security != null) { - security.checkCreateClassLoader(); - } - return null; - } - - private ClassLoader(Void unused, ClassLoader parent) { - this.parent = parent; - if (ParallelLoaders.isRegistered(this.getClass())) { - parallelLockMap = new ConcurrentHashMap<>(); - package2certs = new ConcurrentHashMap<>(); - domains = - Collections.synchronizedSet(new HashSet()); - assertionLock = new Object(); - } else { - // no finer-grained lock; lock on the classloader instance - parallelLockMap = null; - package2certs = new Hashtable<>(); - domains = new HashSet<>(); - assertionLock = this; - } - } /** * Creates a new class loader using the specified parent class loader for @@ -312,7 +178,7 @@ * @since 1.2 */ protected ClassLoader(ClassLoader parent) { - this(checkCreateClassLoader(), parent); + throw new SecurityException(); } /** @@ -331,7 +197,7 @@ * of a new class loader. */ protected ClassLoader() { - this(checkCreateClassLoader(), getSystemClassLoader()); + throw new SecurityException(); } // -- Class -- @@ -404,7 +270,6 @@ // First, check if the class has already been loaded Class c = findLoadedClass(name); if (c == null) { - long t0 = System.nanoTime(); try { if (parent != null) { c = parent.loadClass(name, false); @@ -419,13 +284,12 @@ if (c == null) { // If still not found, then invoke findClass in order // to find the class. - long t1 = System.nanoTime(); c = findClass(name); - // this is the defining class loader; record the stats - sun.misc.PerfCounter.getParentDelegationTime().addTime(t1 - t0); - sun.misc.PerfCounter.getFindClassTime().addElapsedTimeFrom(t1); - sun.misc.PerfCounter.getFindClasses().increment(); +// // this is the defining class loader; record the stats +// sun.misc.PerfCounter.getParentDelegationTime().addTime(t1 - t0); +// sun.misc.PerfCounter.getFindClassTime().addElapsedTimeFrom(t1); +// sun.misc.PerfCounter.getFindClasses().increment(); } } if (resolve) { @@ -457,49 +321,9 @@ */ protected Object getClassLoadingLock(String className) { Object lock = this; - if (parallelLockMap != null) { - Object newLock = new Object(); - lock = parallelLockMap.putIfAbsent(className, newLock); - if (lock == null) { - lock = newLock; - } - } return lock; } - // This method is invoked by the virtual machine to load a class. - private Class loadClassInternal(String name) - throws ClassNotFoundException - { - // For backward compatibility, explicitly lock on 'this' when - // the current class loader is not parallel capable. - if (parallelLockMap == null) { - synchronized (this) { - return loadClass(name); - } - } else { - return loadClass(name); - } - } - - // Invoked by the VM after loading class with this loader. - private void checkPackageAccess(Class cls, ProtectionDomain pd) { - final SecurityManager sm = System.getSecurityManager(); - if (sm != null) { - final String name = cls.getName(); - final int i = name.lastIndexOf('.'); - if (i != -1) { - AccessController.doPrivileged(new PrivilegedAction() { - public Void run() { - sm.checkPackageAccess(name.substring(0, i)); - return null; - } - }, new AccessControlContext(new ProtectionDomain[] {pd})); - } - } - domains.add(pd); - } - /** * Finds the class with the specified binary name. * This method should be overridden by class loader implementations that @@ -567,7 +391,7 @@ protected final Class defineClass(byte[] b, int off, int len) throws ClassFormatError { - return defineClass(null, b, off, len, null); + throw new SecurityException(); } /** @@ -631,363 +455,7 @@ protected final Class defineClass(String name, byte[] b, int off, int len) throws ClassFormatError { - return defineClass(name, b, off, len, null); - } - - /* Determine protection domain, and check that: - - not define java.* class, - - signer of this class matches signers for the rest of the classes in - package. - */ - private ProtectionDomain preDefineClass(String name, - ProtectionDomain pd) - { - if (!checkName(name)) - throw new NoClassDefFoundError("IllegalName: " + name); - - if ((name != null) && name.startsWith("java.")) { - throw new SecurityException - ("Prohibited package name: " + - name.substring(0, name.lastIndexOf('.'))); - } - if (pd == null) { - pd = defaultDomain; - } - - if (name != null) checkCerts(name, pd.getCodeSource()); - - return pd; - } - - private String defineClassSourceLocation(ProtectionDomain pd) - { - CodeSource cs = pd.getCodeSource(); - String source = null; - if (cs != null && cs.getLocation() != null) { - source = cs.getLocation().toString(); - } - return source; - } - - private Class defineTransformedClass(String name, byte[] b, int off, int len, - ProtectionDomain pd, - ClassFormatError cfe, String source) - throws ClassFormatError - { - // Class format error - try to transform the bytecode and - // define the class again - // - ClassFileTransformer[] transformers = - ClassFileTransformer.getTransformers(); - Class c = null; - - if (transformers != null) { - for (ClassFileTransformer transformer : transformers) { - try { - // Transform byte code using transformer - byte[] tb = transformer.transform(b, off, len); - c = defineClass1(name, tb, 0, tb.length, - pd, source); - break; - } catch (ClassFormatError cfe2) { - // If ClassFormatError occurs, try next transformer - } - } - } - - // Rethrow original ClassFormatError if unable to transform - // bytecode to well-formed - // - if (c == null) - throw cfe; - - return c; - } - - private void postDefineClass(Class c, ProtectionDomain pd) - { - if (pd.getCodeSource() != null) { - Certificate certs[] = pd.getCodeSource().getCertificates(); - if (certs != null) - setSigners(c, certs); - } - } - - /** - * Converts an array of bytes into an instance of class Class, - * with an optional ProtectionDomain. If the domain is - * null, then a default domain will be assigned to the class as - * specified in the documentation for {@link #defineClass(String, byte[], - * int, int)}. Before the class can be used it must be resolved. - * - *

The first class defined in a package determines the exact set of - * certificates that all subsequent classes defined in that package must - * contain. The set of certificates for a class is obtained from the - * {@link java.security.CodeSource CodeSource} within the - * ProtectionDomain of the class. Any classes added to that - * package must contain the same set of certificates or a - * SecurityException will be thrown. Note that if - * name is null, this check is not performed. - * You should always pass in the binary name of the - * class you are defining as well as the bytes. This ensures that the - * class you are defining is indeed the class you think it is. - * - *

The specified name cannot begin with "java.", since - * all classes in the "java.* packages can only be defined by the - * bootstrap class loader. If name is not null, it - * must be equal to the binary name of the class - * specified by the byte array "b", otherwise a {@link - * NoClassDefFoundError} will be thrown.

- * - * @param name - * The expected binary name of the class, or - * null if not known - * - * @param b - * The bytes that make up the class data. The bytes in positions - * off through off+len-1 should have the format - * of a valid class file as defined by - * The Java™ Virtual Machine Specification. - * - * @param off - * The start offset in b of the class data - * - * @param len - * The length of the class data - * - * @param protectionDomain - * The ProtectionDomain of the class - * - * @return The Class object created from the data, - * and optional ProtectionDomain. - * - * @throws ClassFormatError - * If the data did not contain a valid class - * - * @throws NoClassDefFoundError - * If name is not equal to the binary - * name of the class specified by b - * - * @throws IndexOutOfBoundsException - * If either off or len is negative, or if - * off+len is greater than b.length. - * - * @throws SecurityException - * If an attempt is made to add this class to a package that - * contains classes that were signed by a different set of - * certificates than this class, or if name begins with - * "java.". - */ - protected final Class defineClass(String name, byte[] b, int off, int len, - ProtectionDomain protectionDomain) - throws ClassFormatError - { - protectionDomain = preDefineClass(name, protectionDomain); - - Class c = null; - String source = defineClassSourceLocation(protectionDomain); - - try { - c = defineClass1(name, b, off, len, protectionDomain, source); - } catch (ClassFormatError cfe) { - c = defineTransformedClass(name, b, off, len, protectionDomain, cfe, - source); - } - - postDefineClass(c, protectionDomain); - return c; - } - - /** - * Converts a {@link java.nio.ByteBuffer ByteBuffer} - * into an instance of class Class, - * with an optional ProtectionDomain. If the domain is - * null, then a default domain will be assigned to the class as - * specified in the documentation for {@link #defineClass(String, byte[], - * int, int)}. Before the class can be used it must be resolved. - * - *

The rules about the first class defined in a package determining the - * set of certificates for the package, and the restrictions on class names - * are identical to those specified in the documentation for {@link - * #defineClass(String, byte[], int, int, ProtectionDomain)}. - * - *

An invocation of this method of the form - * cl.defineClass(name, - * bBuffer, pd) yields exactly the same - * result as the statements - * - *

- * ...
- * byte[] temp = new byte[bBuffer.{@link - * java.nio.ByteBuffer#remaining remaining}()];
- * bBuffer.{@link java.nio.ByteBuffer#get(byte[]) - * get}(temp);
- * return {@link #defineClass(String, byte[], int, int, ProtectionDomain) - * cl.defineClass}(name, temp, 0, - * temp.length, pd);
- *
- * - * @param name - * The expected binary name. of the class, or - * null if not known - * - * @param b - * The bytes that make up the class data. The bytes from positions - * b.position() through b.position() + b.limit() -1 - * should have the format of a valid class file as defined by - * The Java™ Virtual Machine Specification. - * - * @param protectionDomain - * The ProtectionDomain of the class, or null. - * - * @return The Class object created from the data, - * and optional ProtectionDomain. - * - * @throws ClassFormatError - * If the data did not contain a valid class. - * - * @throws NoClassDefFoundError - * If name is not equal to the binary - * name of the class specified by b - * - * @throws SecurityException - * If an attempt is made to add this class to a package that - * contains classes that were signed by a different set of - * certificates than this class, or if name begins with - * "java.". - * - * @see #defineClass(String, byte[], int, int, ProtectionDomain) - * - * @since 1.5 - */ - protected final Class defineClass(String name, java.nio.ByteBuffer b, - ProtectionDomain protectionDomain) - throws ClassFormatError - { - int len = b.remaining(); - - // Use byte[] if not a direct ByteBufer: - if (!b.isDirect()) { - if (b.hasArray()) { - return defineClass(name, b.array(), - b.position() + b.arrayOffset(), len, - protectionDomain); - } else { - // no array, or read-only array - byte[] tb = new byte[len]; - b.get(tb); // get bytes out of byte buffer. - return defineClass(name, tb, 0, len, protectionDomain); - } - } - - protectionDomain = preDefineClass(name, protectionDomain); - - Class c = null; - String source = defineClassSourceLocation(protectionDomain); - - try { - c = defineClass2(name, b, b.position(), len, protectionDomain, - source); - } catch (ClassFormatError cfe) { - byte[] tb = new byte[len]; - b.get(tb); // get bytes out of byte buffer. - c = defineTransformedClass(name, tb, 0, len, protectionDomain, cfe, - source); - } - - postDefineClass(c, protectionDomain); - return c; - } - - private native Class defineClass0(String name, byte[] b, int off, int len, - ProtectionDomain pd); - - private native Class defineClass1(String name, byte[] b, int off, int len, - ProtectionDomain pd, String source); - - private native Class defineClass2(String name, java.nio.ByteBuffer b, - int off, int len, ProtectionDomain pd, - String source); - - // true if the name is null or has the potential to be a valid binary name - private boolean checkName(String name) { - if ((name == null) || (name.length() == 0)) - return true; - if ((name.indexOf('/') != -1) - || (!VM.allowArraySyntax() && (name.charAt(0) == '['))) - return false; - return true; - } - - private void checkCerts(String name, CodeSource cs) { - int i = name.lastIndexOf('.'); - String pname = (i == -1) ? "" : name.substring(0, i); - - Certificate[] certs = null; - if (cs != null) { - certs = cs.getCertificates(); - } - Certificate[] pcerts = null; - if (parallelLockMap == null) { - synchronized (this) { - pcerts = package2certs.get(pname); - if (pcerts == null) { - package2certs.put(pname, (certs == null? nocerts:certs)); - } - } - } else { - pcerts = ((ConcurrentHashMap)package2certs). - putIfAbsent(pname, (certs == null? nocerts:certs)); - } - if (pcerts != null && !compareCerts(pcerts, certs)) { - throw new SecurityException("class \""+ name + - "\"'s signer information does not match signer information of other classes in the same package"); - } - } - - /** - * check to make sure the certs for the new class (certs) are the same as - * the certs for the first class inserted in the package (pcerts) - */ - private boolean compareCerts(Certificate[] pcerts, - Certificate[] certs) - { - // certs can be null, indicating no certs. - if ((certs == null) || (certs.length == 0)) { - return pcerts.length == 0; - } - - // the length must be the same at this point - if (certs.length != pcerts.length) - return false; - - // go through and make sure all the certs in one array - // are in the other and vice-versa. - boolean match; - for (int i = 0; i < certs.length; i++) { - match = false; - for (int j = 0; j < pcerts.length; j++) { - if (certs[i].equals(pcerts[j])) { - match = true; - break; - } - } - if (!match) return false; - } - - // now do the same for pcerts - for (int i = 0; i < pcerts.length; i++) { - match = false; - for (int j = 0; j < certs.length; j++) { - if (pcerts[i].equals(certs[j])) { - match = true; - break; - } - } - if (!match) return false; - } - - return true; + throw new SecurityException(); } /** @@ -1012,57 +480,6 @@ private native void resolveClass0(Class c); - /** - * Finds a class with the specified binary name, - * loading it if necessary. - * - *

This method loads the class through the system class loader (see - * {@link #getSystemClassLoader()}). The Class object returned - * might have more than one ClassLoader associated with it. - * Subclasses of ClassLoader need not usually invoke this method, - * because most class loaders need to override just {@link - * #findClass(String)}.

- * - * @param name - * The binary name of the class - * - * @return The Class object for the specified name - * - * @throws ClassNotFoundException - * If the class could not be found - * - * @see #ClassLoader(ClassLoader) - * @see #getParent() - */ - protected final Class findSystemClass(String name) - throws ClassNotFoundException - { - ClassLoader system = getSystemClassLoader(); - if (system == null) { - if (!checkName(name)) - throw new ClassNotFoundException(name); - Class cls = findBootstrapClass(name); - if (cls == null) { - throw new ClassNotFoundException(name); - } - return cls; - } - return system.loadClass(name); - } - - /** - * Returns a class loaded by the bootstrap class loader; - * or return null if not found. - */ - private Class findBootstrapClassOrNull(String name) - { - if (!checkName(name)) return null; - - return findBootstrapClass(name); - } - - // return null if not found - private native Class findBootstrapClass(String name); /** * Returns the class with the given binary name if this @@ -1099,7 +516,8 @@ * @since 1.1 */ protected final void setSigners(Class c, Object[] signers) { - c.setSigners(signers); + //c.setSigners(signers); + throw new UnsupportedOperationException(); } @@ -1175,7 +593,7 @@ } tmp[1] = findResources(name); - return new CompoundEnumeration<>(tmp); + return new CompoundEnumeration(tmp); } /** @@ -1212,7 +630,7 @@ * @since 1.2 */ protected Enumeration findResources(String name) throws IOException { - return java.util.Collections.emptyEnumeration(); + return new CompoundEnumeration(new Enumeration[0]); } // index 0: java.lang.ClassLoader.class @@ -1235,9 +653,9 @@ * * @since 1.7 */ - protected static boolean registerAsParallelCapable() { - return ParallelLoaders.register(getCaller(1)); - } +// protected static boolean registerAsParallelCapable() { +// return false; +// } /** * Find a resource of the specified name from the search path used to load @@ -1290,37 +708,6 @@ return system.getResources(name); } - /** - * Find resources from the VM's built-in classloader. - */ - private static URL getBootstrapResource(String name) { - URLClassPath ucp = getBootstrapClassPath(); - Resource res = ucp.getResource(name); - return res != null ? res.getURL() : null; - } - - /** - * Find resources from the VM's built-in classloader. - */ - private static Enumeration getBootstrapResources(String name) - throws IOException - { - final Enumeration e = - getBootstrapClassPath().getResources(name); - return new Enumeration () { - public URL nextElement() { - return e.nextElement().getURL(); - } - public boolean hasMoreElements() { - return e.hasMoreElements(); - } - }; - } - - // Returns the URLClassPath that is used for finding system resources. - static URLClassPath getBootstrapClassPath() { - return sun.misc.Launcher.getBootstrapClassPath(); - } /** @@ -1397,16 +784,7 @@ * @since 1.2 */ public final ClassLoader getParent() { - if (parent == null) - return null; - SecurityManager sm = System.getSecurityManager(); - if (sm != null) { - ClassLoader ccl = getCallerClassLoader(); - if (ccl != null && !isAncestor(ccl)) { - sm.checkPermission(SecurityConstants.GET_CLASSLOADER_PERMISSION); - } - } - return parent; + throw new SecurityException(); } /** @@ -1465,48 +843,7 @@ * @revised 1.4 */ public static ClassLoader getSystemClassLoader() { - initSystemClassLoader(); - if (scl == null) { - return null; - } - SecurityManager sm = System.getSecurityManager(); - if (sm != null) { - ClassLoader ccl = getCallerClassLoader(); - if (ccl != null && ccl != scl && !scl.isAncestor(ccl)) { - sm.checkPermission(SecurityConstants.GET_CLASSLOADER_PERMISSION); - } - } - return scl; - } - - private static synchronized void initSystemClassLoader() { - if (!sclSet) { - if (scl != null) - throw new IllegalStateException("recursive invocation"); - sun.misc.Launcher l = sun.misc.Launcher.getLauncher(); - if (l != null) { - Throwable oops = null; - scl = l.getClassLoader(); - try { - scl = AccessController.doPrivileged( - new SystemClassLoaderAction(scl)); - } catch (PrivilegedActionException pae) { - oops = pae.getCause(); - if (oops instanceof InvocationTargetException) { - oops = oops.getCause(); - } - } - if (oops != null) { - if (oops instanceof Error) { - throw (Error) oops; - } else { - // wrap the exception - throw new Error(oops); - } - } - } - sclSet = true; - } + throw new SecurityException(); } // Returns true if the specified class loader can be found in this class @@ -1522,683 +859,54 @@ return false; } - // Returns the invoker's class loader, or null if none. - // NOTE: This must always be invoked when there is exactly one intervening - // frame from the core libraries on the stack between this method's - // invocation and the desired invoker. - static ClassLoader getCallerClassLoader() { - // NOTE use of more generic Reflection.getCallerClass() - Class caller = Reflection.getCallerClass(3); - // This can be null if the VM is requesting it - if (caller == null) { - return null; - } - // Circumvent security check since this is package-private - return caller.getClassLoader0(); + private boolean checkName(String name) { + throw new UnsupportedOperationException(); } - // The class loader for the system - // @GuardedBy("ClassLoader.class") - private static ClassLoader scl; - - // Set to true once the system class loader has been set - // @GuardedBy("ClassLoader.class") - private static boolean sclSet; - - - // -- Package -- - - /** - * Defines a package by name in this ClassLoader. This allows - * class loaders to define the packages for their classes. Packages must - * be created before the class is defined, and package names must be - * unique within a class loader and cannot be redefined or changed once - * created.

- * - * @param name - * The package name - * - * @param specTitle - * The specification title - * - * @param specVersion - * The specification version - * - * @param specVendor - * The specification vendor - * - * @param implTitle - * The implementation title - * - * @param implVersion - * The implementation version - * - * @param implVendor - * The implementation vendor - * - * @param sealBase - * If not null, then this package is sealed with - * respect to the given code source {@link java.net.URL - * URL} object. Otherwise, the package is not sealed. - * - * @return The newly defined Package object - * - * @throws IllegalArgumentException - * If package name duplicates an existing package either in this - * class loader or one of its ancestors - * - * @since 1.2 - */ - protected Package definePackage(String name, String specTitle, - String specVersion, String specVendor, - String implTitle, String implVersion, - String implVendor, URL sealBase) - throws IllegalArgumentException - { - synchronized (packages) { - Package pkg = getPackage(name); - if (pkg != null) { - throw new IllegalArgumentException(name); - } - pkg = new Package(name, specTitle, specVersion, specVendor, - implTitle, implVersion, implVendor, - sealBase, this); - packages.put(name, pkg); - return pkg; - } + private Class findBootstrapClassOrNull(String name) { + throw new UnsupportedOperationException(); } - /** - * Returns a Package that has been defined by this class loader - * or any of its ancestors.

- * - * @param name - * The package name - * - * @return The Package corresponding to the given name, or - * null if not found - * - * @since 1.2 - */ - protected Package getPackage(String name) { - Package pkg; - synchronized (packages) { - pkg = packages.get(name); + private static URL getBootstrapResource(String name) { + throw new UnsupportedOperationException(); + } + + private static Enumeration getBootstrapResources(String name) { + throw new UnsupportedOperationException(); + } + + private static class CompoundEnumeration implements Enumeration { + private URL next; + private int index; + private final Enumeration[] arr; + + public CompoundEnumeration(Enumeration[] arr) { + this.arr = arr; + this.index = 0; } - if (pkg == null) { - if (parent != null) { - pkg = parent.getPackage(name); - } else { - pkg = Package.getSystemPackage(name); - } - if (pkg != null) { - synchronized (packages) { - Package pkg2 = packages.get(name); - if (pkg2 == null) { - packages.put(name, pkg); - } else { - pkg = pkg2; + + public boolean hasMoreElements() { + if (next == null) { + if (arr[index].hasMoreElements()) { + next = (URL) arr[index].nextElement(); + } else { + if (index < arr.length) { + index++; + return hasMoreElements(); } } } - } - return pkg; - } - - /** - * Returns all of the Packages defined by this class loader and - * its ancestors.

- * - * @return The array of Package objects defined by this - * ClassLoader - * - * @since 1.2 - */ - protected Package[] getPackages() { - Map map; - synchronized (packages) { - map = new HashMap<>(packages); - } - Package[] pkgs; - if (parent != null) { - pkgs = parent.getPackages(); - } else { - pkgs = Package.getSystemPackages(); - } - if (pkgs != null) { - for (int i = 0; i < pkgs.length; i++) { - String pkgName = pkgs[i].getName(); - if (map.get(pkgName) == null) { - map.put(pkgName, pkgs[i]); - } - } - } - return map.values().toArray(new Package[map.size()]); - } - - - // -- Native library access -- - - /** - * Returns the absolute path name of a native library. The VM invokes this - * method to locate the native libraries that belong to classes loaded with - * this class loader. If this method returns null, the VM - * searches the library along the path specified as the - * "java.library.path" property.

- * - * @param libname - * The library name - * - * @return The absolute path of the native library - * - * @see System#loadLibrary(String) - * @see System#mapLibraryName(String) - * - * @since 1.2 - */ - protected String findLibrary(String libname) { - return null; - } - - /** - * The inner class NativeLibrary denotes a loaded native library instance. - * Every classloader contains a vector of loaded native libraries in the - * private field nativeLibraries. The native libraries loaded - * into the system are entered into the systemNativeLibraries - * vector. - * - *

Every native library requires a particular version of JNI. This is - * denoted by the private jniVersion field. This field is set by - * the VM when it loads the library, and used by the VM to pass the correct - * version of JNI to the native methods.

- * - * @see ClassLoader - * @since 1.2 - */ - static class NativeLibrary { - // opaque handle to native library, used in native code. - long handle; - // the version of JNI environment the native library requires. - private int jniVersion; - // the class from which the library is loaded, also indicates - // the loader this native library belongs. - private Class fromClass; - // the canonicalized name of the native library. - String name; - - native void load(String name); - native long find(String name); - native void unload(); - - public NativeLibrary(Class fromClass, String name) { - this.name = name; - this.fromClass = fromClass; + return next != null; } - protected void finalize() { - synchronized (loadedLibraryNames) { - if (fromClass.getClassLoader() != null && handle != 0) { - /* remove the native library name */ - int size = loadedLibraryNames.size(); - for (int i = 0; i < size; i++) { - if (name.equals(loadedLibraryNames.elementAt(i))) { - loadedLibraryNames.removeElementAt(i); - break; - } - } - /* unload the library. */ - ClassLoader.nativeLibraryContext.push(this); - try { - unload(); - } finally { - ClassLoader.nativeLibraryContext.pop(); - } - } + public URL nextElement() { + if (!hasMoreElements()) { + throw new NoSuchElementException(); } + URL r = next; + next = null; + return r; } - // Invoked in the VM to determine the context class in - // JNI_Load/JNI_Unload - static Class getFromClass() { - return ClassLoader.nativeLibraryContext.peek().fromClass; - } - } - - // All native library names we've loaded. - private static Vector loadedLibraryNames = new Vector<>(); - - // Native libraries belonging to system classes. - private static Vector systemNativeLibraries - = new Vector<>(); - - // Native libraries associated with the class loader. - private Vector nativeLibraries = new Vector<>(); - - // native libraries being loaded/unloaded. - private static Stack nativeLibraryContext = new Stack<>(); - - // The paths searched for libraries - private static String usr_paths[]; - private static String sys_paths[]; - - private static String[] initializePath(String propname) { - String ldpath = System.getProperty(propname, ""); - String ps = File.pathSeparator; - int ldlen = ldpath.length(); - int i, j, n; - // Count the separators in the path - i = ldpath.indexOf(ps); - n = 0; - while (i >= 0) { - n++; - i = ldpath.indexOf(ps, i + 1); - } - - // allocate the array of paths - n :'s = n + 1 path elements - String[] paths = new String[n + 1]; - - // Fill the array with paths from the ldpath - n = i = 0; - j = ldpath.indexOf(ps); - while (j >= 0) { - if (j - i > 0) { - paths[n++] = ldpath.substring(i, j); - } else if (j - i == 0) { - paths[n++] = "."; - } - i = j + 1; - j = ldpath.indexOf(ps, i); - } - paths[n] = ldpath.substring(i, ldlen); - return paths; - } - - // Invoked in the java.lang.Runtime class to implement load and loadLibrary. - static void loadLibrary(Class fromClass, String name, - boolean isAbsolute) { - ClassLoader loader = - (fromClass == null) ? null : fromClass.getClassLoader(); - if (sys_paths == null) { - usr_paths = initializePath("java.library.path"); - sys_paths = initializePath("sun.boot.library.path"); - } - if (isAbsolute) { - if (loadLibrary0(fromClass, new File(name))) { - return; - } - throw new UnsatisfiedLinkError("Can't load library: " + name); - } - if (loader != null) { - String libfilename = loader.findLibrary(name); - if (libfilename != null) { - File libfile = new File(libfilename); - if (!libfile.isAbsolute()) { - throw new UnsatisfiedLinkError( - "ClassLoader.findLibrary failed to return an absolute path: " + libfilename); - } - if (loadLibrary0(fromClass, libfile)) { - return; - } - throw new UnsatisfiedLinkError("Can't load " + libfilename); - } - } - for (int i = 0 ; i < sys_paths.length ; i++) { - File libfile = new File(sys_paths[i], System.mapLibraryName(name)); - if (loadLibrary0(fromClass, libfile)) { - return; - } - } - if (loader != null) { - for (int i = 0 ; i < usr_paths.length ; i++) { - File libfile = new File(usr_paths[i], - System.mapLibraryName(name)); - if (loadLibrary0(fromClass, libfile)) { - return; - } - } - } - // Oops, it failed - throw new UnsatisfiedLinkError("no " + name + " in java.library.path"); - } - - private static boolean loadLibrary0(Class fromClass, final File file) { - boolean exists = AccessController.doPrivileged( - new PrivilegedAction() { - public Object run() { - return file.exists() ? Boolean.TRUE : null; - }}) - != null; - if (!exists) { - return false; - } - String name; - try { - name = file.getCanonicalPath(); - } catch (IOException e) { - return false; - } - ClassLoader loader = - (fromClass == null) ? null : fromClass.getClassLoader(); - Vector libs = - loader != null ? loader.nativeLibraries : systemNativeLibraries; - synchronized (libs) { - int size = libs.size(); - for (int i = 0; i < size; i++) { - NativeLibrary lib = libs.elementAt(i); - if (name.equals(lib.name)) { - return true; - } - } - - synchronized (loadedLibraryNames) { - if (loadedLibraryNames.contains(name)) { - throw new UnsatisfiedLinkError - ("Native Library " + - name + - " already loaded in another classloader"); - } - /* If the library is being loaded (must be by the same thread, - * because Runtime.load and Runtime.loadLibrary are - * synchronous). The reason is can occur is that the JNI_OnLoad - * function can cause another loadLibrary invocation. - * - * Thus we can use a static stack to hold the list of libraries - * we are loading. - * - * If there is a pending load operation for the library, we - * immediately return success; otherwise, we raise - * UnsatisfiedLinkError. - */ - int n = nativeLibraryContext.size(); - for (int i = 0; i < n; i++) { - NativeLibrary lib = nativeLibraryContext.elementAt(i); - if (name.equals(lib.name)) { - if (loader == lib.fromClass.getClassLoader()) { - return true; - } else { - throw new UnsatisfiedLinkError - ("Native Library " + - name + - " is being loaded in another classloader"); - } - } - } - NativeLibrary lib = new NativeLibrary(fromClass, name); - nativeLibraryContext.push(lib); - try { - lib.load(name); - } finally { - nativeLibraryContext.pop(); - } - if (lib.handle != 0) { - loadedLibraryNames.addElement(name); - libs.addElement(lib); - return true; - } - return false; - } - } - } - - // Invoked in the VM class linking code. - static long findNative(ClassLoader loader, String name) { - Vector libs = - loader != null ? loader.nativeLibraries : systemNativeLibraries; - synchronized (libs) { - int size = libs.size(); - for (int i = 0; i < size; i++) { - NativeLibrary lib = libs.elementAt(i); - long entry = lib.find(name); - if (entry != 0) - return entry; - } - } - return 0; - } - - - // -- Assertion management -- - - final Object assertionLock; - - // The default toggle for assertion checking. - // @GuardedBy("assertionLock") - private boolean defaultAssertionStatus = false; - - // Maps String packageName to Boolean package default assertion status Note - // that the default package is placed under a null map key. If this field - // is null then we are delegating assertion status queries to the VM, i.e., - // none of this ClassLoader's assertion status modification methods have - // been invoked. - // @GuardedBy("assertionLock") - private Map packageAssertionStatus = null; - - // Maps String fullyQualifiedClassName to Boolean assertionStatus If this - // field is null then we are delegating assertion status queries to the VM, - // i.e., none of this ClassLoader's assertion status modification methods - // have been invoked. - // @GuardedBy("assertionLock") - Map classAssertionStatus = null; - - /** - * Sets the default assertion status for this class loader. This setting - * determines whether classes loaded by this class loader and initialized - * in the future will have assertions enabled or disabled by default. - * This setting may be overridden on a per-package or per-class basis by - * invoking {@link #setPackageAssertionStatus(String, boolean)} or {@link - * #setClassAssertionStatus(String, boolean)}.

- * - * @param enabled - * true if classes loaded by this class loader will - * henceforth have assertions enabled by default, false - * if they will have assertions disabled by default. - * - * @since 1.4 - */ - public void setDefaultAssertionStatus(boolean enabled) { - synchronized (assertionLock) { - if (classAssertionStatus == null) - initializeJavaAssertionMaps(); - - defaultAssertionStatus = enabled; - } - } - - /** - * Sets the package default assertion status for the named package. The - * package default assertion status determines the assertion status for - * classes initialized in the future that belong to the named package or - * any of its "subpackages". - * - *

A subpackage of a package named p is any package whose name begins - * with "p.". For example, javax.swing.text is a - * subpackage of javax.swing, and both java.util and - * java.lang.reflect are subpackages of java. - * - *

In the event that multiple package defaults apply to a given class, - * the package default pertaining to the most specific package takes - * precedence over the others. For example, if javax.lang and - * javax.lang.reflect both have package defaults associated with - * them, the latter package default applies to classes in - * javax.lang.reflect. - * - *

Package defaults take precedence over the class loader's default - * assertion status, and may be overridden on a per-class basis by invoking - * {@link #setClassAssertionStatus(String, boolean)}.

- * - * @param packageName - * The name of the package whose package default assertion status - * is to be set. A null value indicates the unnamed - * package that is "current" - * (see section 7.4.2 of - * The Java™ Language Specification.) - * - * @param enabled - * true if classes loaded by this classloader and - * belonging to the named package or any of its subpackages will - * have assertions enabled by default, false if they will - * have assertions disabled by default. - * - * @since 1.4 - */ - public void setPackageAssertionStatus(String packageName, - boolean enabled) { - synchronized (assertionLock) { - if (packageAssertionStatus == null) - initializeJavaAssertionMaps(); - - packageAssertionStatus.put(packageName, enabled); - } - } - - /** - * Sets the desired assertion status for the named top-level class in this - * class loader and any nested classes contained therein. This setting - * takes precedence over the class loader's default assertion status, and - * over any applicable per-package default. This method has no effect if - * the named class has already been initialized. (Once a class is - * initialized, its assertion status cannot change.) - * - *

If the named class is not a top-level class, this invocation will - * have no effect on the actual assertion status of any class.

- * - * @param className - * The fully qualified class name of the top-level class whose - * assertion status is to be set. - * - * @param enabled - * true if the named class is to have assertions - * enabled when (and if) it is initialized, false if the - * class is to have assertions disabled. - * - * @since 1.4 - */ - public void setClassAssertionStatus(String className, boolean enabled) { - synchronized (assertionLock) { - if (classAssertionStatus == null) - initializeJavaAssertionMaps(); - - classAssertionStatus.put(className, enabled); - } - } - - /** - * Sets the default assertion status for this class loader to - * false and discards any package defaults or class assertion - * status settings associated with the class loader. This method is - * provided so that class loaders can be made to ignore any command line or - * persistent assertion status settings and "start with a clean slate." - *

- * - * @since 1.4 - */ - public void clearAssertionStatus() { - /* - * Whether or not "Java assertion maps" are initialized, set - * them to empty maps, effectively ignoring any present settings. - */ - synchronized (assertionLock) { - classAssertionStatus = new HashMap<>(); - packageAssertionStatus = new HashMap<>(); - defaultAssertionStatus = false; - } - } - - /** - * Returns the assertion status that would be assigned to the specified - * class if it were to be initialized at the time this method is invoked. - * If the named class has had its assertion status set, the most recent - * setting will be returned; otherwise, if any package default assertion - * status pertains to this class, the most recent setting for the most - * specific pertinent package default assertion status is returned; - * otherwise, this class loader's default assertion status is returned. - *

- * - * @param className - * The fully qualified class name of the class whose desired - * assertion status is being queried. - * - * @return The desired assertion status of the specified class. - * - * @see #setClassAssertionStatus(String, boolean) - * @see #setPackageAssertionStatus(String, boolean) - * @see #setDefaultAssertionStatus(boolean) - * - * @since 1.4 - */ - boolean desiredAssertionStatus(String className) { - synchronized (assertionLock) { - // assert classAssertionStatus != null; - // assert packageAssertionStatus != null; - - // Check for a class entry - Boolean result = classAssertionStatus.get(className); - if (result != null) - return result.booleanValue(); - - // Check for most specific package entry - int dotIndex = className.lastIndexOf("."); - if (dotIndex < 0) { // default package - result = packageAssertionStatus.get(null); - if (result != null) - return result.booleanValue(); - } - while(dotIndex > 0) { - className = className.substring(0, dotIndex); - result = packageAssertionStatus.get(className); - if (result != null) - return result.booleanValue(); - dotIndex = className.lastIndexOf(".", dotIndex-1); - } - - // Return the classloader default - return defaultAssertionStatus; - } - } - - // Set up the assertions with information provided by the VM. - // Note: Should only be called inside a synchronized block - private void initializeJavaAssertionMaps() { - // assert Thread.holdsLock(assertionLock); - - classAssertionStatus = new HashMap<>(); - packageAssertionStatus = new HashMap<>(); - AssertionStatusDirectives directives = retrieveDirectives(); - - for(int i = 0; i < directives.classes.length; i++) - classAssertionStatus.put(directives.classes[i], - directives.classEnabled[i]); - - for(int i = 0; i < directives.packages.length; i++) - packageAssertionStatus.put(directives.packages[i], - directives.packageEnabled[i]); - - defaultAssertionStatus = directives.deflt; - } - - // Retrieves the assertion directives from the VM. - private static native AssertionStatusDirectives retrieveDirectives(); -} - - -class SystemClassLoaderAction - implements PrivilegedExceptionAction { - private ClassLoader parent; - - SystemClassLoaderAction(ClassLoader parent) { - this.parent = parent; - } - - public ClassLoader run() throws Exception { - String cls = System.getProperty("java.system.class.loader"); - if (cls == null) { - return parent; - } - - Constructor ctor = Class.forName(cls, true, parent) - .getDeclaredConstructor(new Class[] { ClassLoader.class }); - ClassLoader sys = (ClassLoader) ctor.newInstance( - new Object[] { parent }); - Thread.currentThread().setContextClassLoader(sys); - return sys; + } }