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authortromey <tromey@138bc75d-0d04-0410-961f-82ee72b054a4>2005-07-16 00:31:27 +0000
committertromey <tromey@138bc75d-0d04-0410-961f-82ee72b054a4>2005-07-16 00:31:27 +0000
commit8082e4be668d586a1ac2c7c05eb710841b6b6202 (patch)
treeed80c7de91726768a42b235beffbaf622dc2553e /libjava/classpath/vm/reference/java/lang/VMClassLoader.java
parentc8875fb97fc03779a5bba09872227b1d08e5d52a (diff)
downloadppe42-gcc-8082e4be668d586a1ac2c7c05eb710841b6b6202.tar.gz
ppe42-gcc-8082e4be668d586a1ac2c7c05eb710841b6b6202.zip
Initial revision
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@102075 138bc75d-0d04-0410-961f-82ee72b054a4
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+/* VMClassLoader.java -- Reference implementation of native interface
+ required by ClassLoader
+ Copyright (C) 1998, 2001, 2002, 2004, 2005 Free Software Foundation
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING. If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library. Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module. An independent module is a module which is not derived from
+or based on this library. If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so. If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package java.lang;
+
+import gnu.classpath.SystemProperties;
+
+import java.io.File;
+import java.io.IOException;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.security.ProtectionDomain;
+import java.util.Enumeration;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.StringTokenizer;
+import java.util.Vector;
+import java.util.zip.ZipFile;
+
+/**
+ * java.lang.VMClassLoader is a package-private helper for VMs to implement
+ * on behalf of java.lang.ClassLoader.
+ *
+ * @author John Keiser
+ * @author Mark Wielaard (mark@klomp.org)
+ * @author Eric Blake (ebb9@email.byu.edu)
+ */
+final class VMClassLoader
+{
+ /**
+ * Helper to define a class using a string of bytes. This assumes that
+ * the security checks have already been performed, if necessary.
+ *
+ * Implementations of this method are advised to consider the
+ * situation where user code modifies the byte array after it has
+ * been passed to defineClass. This can be handled by making a
+ * private copy of the array, or arranging to only read any given
+ * byte a single time.
+ *
+ * @param name the name to give the class, or null if unknown
+ * @param data the data representing the classfile, in classfile format
+ * @param offset the offset into the data where the classfile starts
+ * @param len the length of the classfile data in the array
+ * @param pd the protection domain
+ * @return the class that was defined
+ * @throws ClassFormatError if data is not in proper classfile format
+ */
+ static final native Class defineClass(ClassLoader cl, String name,
+ byte[] data, int offset, int len,
+ ProtectionDomain pd)
+ throws ClassFormatError;
+
+ /**
+ * Helper to resolve all references to other classes from this class.
+ *
+ * @param c the class to resolve
+ */
+ static final native void resolveClass(Class c);
+
+ /**
+ * Helper to load a class from the bootstrap class loader.
+ *
+ * @param name the class name to load
+ * @param resolve whether to resolve it
+ * @return the class, loaded by the bootstrap classloader or null
+ * if the class wasn't found. Returning null is equivalent to throwing
+ * a ClassNotFoundException (but a possible performance optimization).
+ */
+ static final native Class loadClass(String name, boolean resolve)
+ throws ClassNotFoundException;
+
+ /**
+ * Helper to load a resource from the bootstrap class loader.
+ *
+ * @param name the resource to find
+ * @return the URL to the resource
+ */
+ static URL getResource(String name)
+ {
+ Enumeration e = getResources(name);
+ if (e.hasMoreElements())
+ return (URL)e.nextElement();
+ return null;
+ }
+
+ /**
+ * Helper to get a list of resources from the bootstrap class loader.
+ *
+ * @param name the resource to find
+ * @return an enumeration of resources
+ * @throws IOException if one occurs
+ */
+ static Enumeration getResources(String name)
+ {
+ StringTokenizer st = new StringTokenizer(
+ SystemProperties.getProperty("java.boot.class.path", "."),
+ File.pathSeparator);
+ Vector v = new Vector();
+ while (st.hasMoreTokens())
+ {
+ File file = new File(st.nextToken());
+ if (file.isDirectory())
+ {
+ try
+ {
+ v.add(new URL("file://"
+ + new File(file, name).getAbsolutePath()));
+ }
+ catch (MalformedURLException e)
+ {
+ throw new Error(e);
+ }
+ }
+ else if (file.isFile())
+ {
+ ZipFile zip;
+ try
+ {
+ zip = new ZipFile(file);
+ }
+ catch (IOException e)
+ {
+ continue;
+ }
+ String zname = name.startsWith("/") ? name.substring(1) : name;
+ try
+ {
+ if (zip.getEntry(zname) == null)
+ continue;
+ }
+ finally
+ {
+ try
+ {
+ zip.close();
+ }
+ catch (IOException e)
+ {
+ }
+ }
+ try
+ {
+ v.add(new URL("jar:file://"
+ + file.getAbsolutePath() + "!/" + zname));
+ }
+ catch (MalformedURLException e)
+ {
+ throw new Error(e);
+ }
+ }
+ }
+ return v.elements();
+ }
+
+ /**
+ * Helper to get a package from the bootstrap class loader. The default
+ * implementation of returning null may be adequate, or you may decide
+ * that this needs some native help.
+ *
+ * @param name the name to find
+ * @return the named package, if it exists
+ */
+ static Package getPackage(String name)
+ {
+ return null;
+ }
+
+ /**
+ * Helper to get all packages from the bootstrap class loader. The default
+ * implementation of returning an empty array may be adequate, or you may
+ * decide that this needs some native help.
+ *
+ * @return all named packages, if any exist
+ */
+ static Package[] getPackages()
+ {
+ return new Package[0];
+ }
+
+ /**
+ * Helper for java.lang.Integer, Byte, etc to get the TYPE class
+ * at initialization time. The type code is one of the chars that
+ * represents the primitive type as in JNI.
+ *
+ * <ul>
+ * <li>'Z' - boolean</li>
+ * <li>'B' - byte</li>
+ * <li>'C' - char</li>
+ * <li>'D' - double</li>
+ * <li>'F' - float</li>
+ * <li>'I' - int</li>
+ * <li>'J' - long</li>
+ * <li>'S' - short</li>
+ * <li>'V' - void</li>
+ * </ul>
+ *
+ * @param type the primitive type
+ * @return a "bogus" class representing the primitive type
+ */
+ static final native Class getPrimitiveClass(char type);
+
+ /**
+ * The system default for assertion status. This is used for all system
+ * classes (those with a null ClassLoader), as well as the initial value for
+ * every ClassLoader's default assertion status.
+ *
+ * XXX - Not implemented yet; this requires native help.
+ *
+ * @return the system-wide default assertion status
+ */
+ static final boolean defaultAssertionStatus()
+ {
+ return true;
+ }
+
+ /**
+ * The system default for package assertion status. This is used for all
+ * ClassLoader's packageAssertionStatus defaults. It must be a map of
+ * package names to Boolean.TRUE or Boolean.FALSE, with the unnamed package
+ * represented as a null key.
+ *
+ * XXX - Not implemented yet; this requires native help.
+ *
+ * @return a (read-only) map for the default packageAssertionStatus
+ */
+ static final Map packageAssertionStatus()
+ {
+ return new HashMap();
+ }
+
+ /**
+ * The system default for class assertion status. This is used for all
+ * ClassLoader's classAssertionStatus defaults. It must be a map of
+ * class names to Boolean.TRUE or Boolean.FALSE
+ *
+ * XXX - Not implemented yet; this requires native help.
+ *
+ * @return a (read-only) map for the default classAssertionStatus
+ */
+ static final Map classAssertionStatus()
+ {
+ return new HashMap();
+ }
+
+ static ClassLoader getSystemClassLoader()
+ {
+ return ClassLoader.defaultGetSystemClassLoader();
+ }
+}
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