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/*******************************************************************************
* Copyright (c) 2010, 2011 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.osgi.internal.baseadaptor.weaving;
import java.security.*;
import java.util.*;
import org.eclipse.osgi.internal.loader.BundleLoader;
import org.eclipse.osgi.internal.serviceregistry.HookContext;
import org.eclipse.osgi.internal.serviceregistry.ServiceRegistry;
import org.eclipse.osgi.util.ManifestElement;
import org.osgi.framework.*;
import org.osgi.framework.hooks.weaving.*;
import org.osgi.framework.wiring.BundleWiring;
public final class WovenClassImpl implements WovenClass, HookContext {
private final static byte FLAG_HOOKCALLED = 0x01;
private final static byte FLAG_HOOKSCOMPLETE = 0x02;
private final static byte FLAG_WEAVINGCOMPLETE = 0x04;
private final static String weavingHookName = WeavingHook.class.getName();
private final String className;
private final List<String> dynamicImports;
private final ProtectionDomain domain;
private final BundleLoader loader;
final ServiceRegistry registry;
private final Map<ServiceRegistration<?>, Boolean> blackList;
private byte[] bytes;
private byte hookFlags = 0;
private Throwable error;
private ServiceRegistration<?> errorHook;
private Class<?> clazz;
public WovenClassImpl(String className, byte[] bytes, ProtectionDomain domain, BundleLoader loader, ServiceRegistry registry, Map<ServiceRegistration<?>, Boolean> blacklist) {
super();
this.className = className;
this.bytes = bytes;
this.dynamicImports = new DynamicImportList(this);
this.domain = domain;
this.loader = loader;
this.registry = registry;
this.blackList = blacklist;
}
public byte[] getBytes() {
if ((hookFlags & FLAG_HOOKSCOMPLETE) == 0) {
checkPermission();
return bytes; // return raw bytes until complete
}
// we have called all hooks; someone is calling outside of weave call
// need to be safe and copy the bytes.
byte[] current = bytes;
byte[] results = new byte[current.length];
System.arraycopy(bytes, 0, results, 0, current.length);
return results;
}
public void setBytes(byte[] newBytes) {
checkPermission();
if (newBytes == null)
throw new NullPointerException("newBytes cannot be null."); //$NON-NLS-1$
if ((hookFlags & FLAG_HOOKSCOMPLETE) != 0)
// someone is calling this outside of weave
throw new IllegalStateException("Weaving has completed already."); //$NON-NLS-1$
this.bytes = newBytes;
}
void checkPermission() {
SecurityManager sm = System.getSecurityManager();
if (sm != null)
sm.checkPermission(new AdminPermission(loader.getBundle(), AdminPermission.WEAVE));
}
public List<String> getDynamicImports() {
if ((hookFlags & FLAG_HOOKSCOMPLETE) == 0)
return dynamicImports;
// being called outside of weave; return unmodified list
return Collections.unmodifiableList(dynamicImports);
}
public boolean isWeavingComplete() {
return (hookFlags & FLAG_WEAVINGCOMPLETE) != 0;
}
private void setHooksComplete() {
// create a copy of the bytes array that noone has a reference to
byte[] original = bytes;
bytes = new byte[bytes.length];
System.arraycopy(original, 0, bytes, 0, original.length);
hookFlags |= FLAG_HOOKSCOMPLETE;
}
void setWeavingCompleted(Class<?> clazz) {
// weaving has completed; save the class and mark complete
this.clazz = clazz;
hookFlags |= FLAG_WEAVINGCOMPLETE;
}
public String getClassName() {
return className;
}
public ProtectionDomain getProtectionDomain() {
return domain;
}
public Class<?> getDefinedClass() {
return clazz;
}
public BundleWiring getBundleWiring() {
return loader.getLoaderProxy().getBundleDescription().getWiring();
}
public void call(final Object hook, ServiceRegistration<?> hookRegistration) throws Exception {
if (error != null)
return; // do not call any other hooks once an error has occurred.
if (hook instanceof WeavingHook) {
if (blackList.containsKey(hookRegistration))
return; // black listed hook
hookFlags |= FLAG_HOOKCALLED;
try {
((WeavingHook) hook).weave(this);
} catch (WeavingException e) {
error = e;
errorHook = hookRegistration;
// do not blacklist on weaving exceptions
} catch (Throwable t) {
error = t; // save the error to fail later
errorHook = hookRegistration;
// put the registration on the black list
blackList.put(hookRegistration, Boolean.TRUE);
}
}
}
public String getHookMethodName() {
return "weave"; //$NON-NLS-1$
}
public String getHookClassName() {
return weavingHookName;
}
byte[] callHooks() throws Throwable {
SecurityManager sm = System.getSecurityManager();
byte[] wovenBytes = null;
List<String> newImports = null;
try {
if (sm == null) {
registry.notifyHooksPrivileged(this);
} else {
try {
AccessController.doPrivileged(new PrivilegedExceptionAction<Object>() {
public Object run() {
registry.notifyHooksPrivileged(WovenClassImpl.this);
return null;
}
});
} catch (PrivilegedActionException e) {
throw (RuntimeException) e.getException();
}
}
} finally {
if ((hookFlags & FLAG_HOOKCALLED) != 0) {
wovenBytes = bytes;
newImports = dynamicImports;
setHooksComplete();
}
}
if (error != null)
throw error;
if (newImports != null) {
// add any new dynamic imports
for (String newImport : newImports) {
try {
ManifestElement[] importElements = ManifestElement.parseHeader(Constants.IMPORT_PACKAGE, newImport);
loader.addDynamicImportPackage(importElements);
} catch (BundleException e) {
// should not have happened; checked at add.
}
}
}
return wovenBytes;
}
public String toString() {
return className;
}
public ServiceRegistration<?> getErrorHook() {
return errorHook;
}
}
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