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/*******************************************************************************
* Copyright (c) 2006, 2018 IBM Corp. 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/
* or the Apache License, Version 2.0 which accompanies this distribution and
* is available at https://www.apache.org/licenses/LICENSE-2.0.
*
* This Source Code may also be made available under the following
* Secondary Licenses when the conditions for such availability set
* forth in the Eclipse Public License, v. 2.0 are satisfied: GNU
* General Public License, version 2 with the GNU Classpath
* Exception [1] and GNU General Public License, version 2 with the
* OpenJDK Assembly Exception [2].
*
* [1] https://www.gnu.org/software/classpath/license.html
* [2] http://openjdk.java.net/legal/assembly-exception.html
*
* SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception
*******************************************************************************/
package org.eclipse.osgi.internal.cds;
import com.ibm.oti.shared.SharedClassURLHelper;
import java.net.MalformedURLException;
import java.net.URL;
import org.eclipse.osgi.storage.bundlefile.BundleEntry;
import org.eclipse.osgi.storage.bundlefile.BundleFile;
import org.eclipse.osgi.storage.bundlefile.BundleFileWrapper;
/**
* Wraps an actual BundleFile object for purposes of loading classes from the
* shared classes cache.
*/
public class CDSBundleFile extends BundleFileWrapper {
private final static String classFileExt = ".class"; //$NON-NLS-1$
private URL url; // the URL to the content of the real bundle file
private SharedClassURLHelper urlHelper; // the url helper set by the classloader
private boolean primed = false;
/**
* The constructor
* @param wrapped the real bundle file
*/
public CDSBundleFile(BundleFile wrapped) {
super(wrapped);
// get the url to the content of the real bundle file
try {
this.url = new URL("file", "", wrapped.getBaseFile().getAbsolutePath()); //$NON-NLS-1$ //$NON-NLS-2$
} catch (MalformedURLException e) {
// do nothing
}
}
public CDSBundleFile(BundleFile bundleFile, SharedClassURLHelper urlHelper) {
this(bundleFile);
this.urlHelper = urlHelper;
}
/*
* (non-Javadoc)
* @see org.eclipse.osgi.storage.bundlefile.BundleFile#getEntry(java.lang.String)
*
* If path is not for a class then just use the wrapped bundle file to answer the call.
* If the path is for a class, it returns a CDSBundleEntry object.
* If the path is for a class, it will look for the magic cookie in the
* shared classes cache. If found, the bytes representing the magic cookie are stored in CDSBundleEntry object.
*/
public BundleEntry getEntry(String path) {
BundleEntry wrappedEntry = super.getEntry(path);
if (wrappedEntry == null) {
return null;
}
if (!primed || !path.endsWith(classFileExt)) {
return wrappedEntry;
}
byte[] classbytes = getClassBytes(path.substring(0, path.length() - classFileExt.length()));
BundleEntry be = new CDSBundleEntry(path, classbytes, wrappedEntry);
return be;
}
/**
* Returns the file url to the content of the actual bundle file
* @return the file url to the content of the actual bundle file
*/
URL getURL() {
return url;
}
/**
* Returns the url helper for this bundle file. This is set by the
* class loading hook
* @return the url helper for this bundle file
*/
SharedClassURLHelper getURLHelper() {
return urlHelper;
}
/**
* Sets the url helper for this bundle file. This is called by the
* class loading hook.
* @param urlHelper the url helper
*/
void setURLHelper(SharedClassURLHelper urlHelper) {
this.urlHelper = urlHelper;
this.primed = false; // always unprime when a new urlHelper is set
}
/**
* Sets the primed flag for the bundle file. This is called by the
* class loading hook after the first class has been loaded from disk for
* this bundle file.
* @param primed the primed flag
*/
void setPrimed(boolean primed) {
this.primed = primed;
}
/**
* Searches in the shared classes cache for the specified class name.
* @param name the name of the class
* @return the magic cookie to the shared class or null if the class is not in the cache.
*/
private byte[] getClassBytes(String name) {
if (urlHelper == null || url == null)
return null;
return urlHelper.findSharedClass(null, url, name);
}
}
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