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/*******************************************************************************
* Copyright (c) 2004, 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
* Hannes Wellmann - Bug 576643: Clean up and unify Bundle resource classes
*******************************************************************************/
package org.eclipse.osgi.storage.bundlefile;
import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLStreamHandler;
import java.security.AccessController;
import java.util.Enumeration;
import org.eclipse.osgi.container.Module;
import org.eclipse.osgi.container.ModuleContainer;
import org.eclipse.osgi.framework.util.SecureAction;
import org.eclipse.osgi.storage.url.BundleResourceHandler;
import org.eclipse.osgi.storage.url.bundleresource.Handler;
/**
* The BundleFile API is used by Adaptors to read resources out of an
* installed Bundle in the Framework.
*
* Clients wishing to modify or extend the functionality of this class at
* runtime should extend the associated {@link BundleFileWrapper decorator}
* instead.
*/
abstract public class BundleFile {
static final SecureAction secureAction = AccessController.doPrivileged(SecureAction.createSecureAction());
/**
* The File object for this BundleFile.
*/
protected File basefile;
private int mruIndex = -1;
/**
* BundleFile constructor
* @param basefile The File object where this BundleFile is
* persistently stored.
*/
protected BundleFile(File basefile) {
this.basefile = basefile;
}
/**
* Returns a File for the bundle entry specified by the path.
* If required the content of the bundle entry is extracted into a file
* on the file system.
* @param path The path to the entry to locate a File for.
* @param nativeCode true if the path is native code.
* @return A File object to access the contents of the bundle entry.
*/
abstract public File getFile(String path, boolean nativeCode);
/**
* Locates a file name in this bundle and returns a BundleEntry object
*
* @param path path of the entry to locate in the bundle
* @return BundleEntry object or null if the file name
* does not exist in the bundle
*/
abstract public BundleEntry getEntry(String path);
/**
* Performs the same function as calling
* {@link #getEntryPaths(String, boolean)} with recurse equal
* to false.
* @param path path of the entry to locate in the bundle
* @return an Enumeration of Strings that indicate the paths found or
* null if the path does not exist.
*/
public Enumeration getEntryPaths(String path) {
return getEntryPaths(path, false);
}
/**
* Allows to access the entries of the bundle.
* Since the bundle content is usually a jar, this
* allows to access the jar contents.
*
* GetEntryPaths allows to enumerate the content of "path".
* If path is a directory, it is equivalent to listing the directory
* contents. The returned names are either files or directories
* themselves. If a returned name is a directory, it finishes with a
* slash. If a returned name is a file, it does not finish with a slash.
* @param path path of the entry to locate in the bundle
* @param recurse - If true, provide entries for the files and
* directories within the directory denoted by path plus
* all sub-directories and files; otherwise, provide only the entries
* within the immediate directory.
* @return an Enumeration of Strings that indicate the paths found or
* null if the path does not exist.
*/
abstract public Enumeration getEntryPaths(String path, boolean recurse);
/**
* Closes the BundleFile.
* @throws IOException if any error occurs.
*/
abstract public void close() throws IOException;
/**
* Opens the BundleFiles.
* @throws IOException if any error occurs.
*/
abstract public void open() throws IOException;
/**
* Determines if any BundleEntries exist in the given directory path.
* @param dir The directory path to check existence of.
* @return true if the BundleFile contains entries under the given directory path;
* false otherwise.
*/
abstract public boolean containsDir(String dir);
/**
* Returns a URL to access the contents of the entry specified by the path.
* This method first calls {@link #getEntry(String)} to locate the entry
* at the specified path. If no entry is found {@code null} is returned;
* otherwise {@link #createResourceURL(BundleEntry, Module, int, String)}
* is called in order to create the URL. Subclasses should not override
* this method. Instead the methods {@link #getEntry(String)} and/or
* {@link #createResourceURL(BundleEntry, Module, int, String)} may be
* overriden to augment the behavior.
* @param path the path to the resource
* @param hostModule the host module
* @param index the resource index
* @return a URL to access the contents of the entry specified by the path
*/
public URL getResourceURL(String path, Module hostModule, int index) {
BundleEntry bundleEntry = getEntry(path);
if (bundleEntry == null)
return null;
return createResourceURL(bundleEntry, hostModule, index, path);
}
/**
* Creates a URL to access the content of the specified entry
* @param bundleEntry the bundle entry
* @param hostModule the host module
* @param index the resource index
* @param path
* @return a URL to access the contents of the specified entry
*/
protected URL createResourceURL(BundleEntry bundleEntry, Module hostModule, int index, String path) {
// use the constant string for the protocol to prevent duplication
String protocol = BundleResourceHandler.OSGI_RESOURCE_URL_PROTOCOL;
long bundleId = hostModule.getId();
ModuleContainer container = hostModule.getContainer();
Handler handler = new Handler(container, bundleEntry);
return createURL(protocol, bundleId, container, bundleEntry, index, path, handler);
}
/**
* Returns the base file for this BundleFile
* @return the base file for this BundleFile
*/
public File getBaseFile() {
return basefile;
}
void setMruIndex(int index) {
mruIndex = index;
}
int getMruIndex() {
return mruIndex;
}
@Override
public String toString() {
return String.valueOf(basefile);
}
public static URL createURL(String protocol, long bundleId, ModuleContainer container, BundleEntry entry, int index,
String path, URLStreamHandler handler) {
path = fixTrailingSlash(path, entry);
try {
String host = BundleResourceHandler.createURLHostForBundleID(container, bundleId);
return secureAction.getURL(protocol, host, index, path, handler);
} catch (MalformedURLException e) {
return null;
}
}
public static String fixTrailingSlash(String path, BundleEntry entry) {
if (path.length() == 0)
return "/"; //$NON-NLS-1$
if (path.charAt(0) != '/')
path = '/' + path;
String name = entry.getName();
if (name.length() == 0)
return path;
boolean pathSlash = path.charAt(path.length() - 1) == '/';
boolean entrySlash = name.length() > 0 && name.charAt(name.length() - 1) == '/';
if (entrySlash != pathSlash) {
if (entrySlash)
path = path + '/';
else
path = path.substring(0, path.length() - 1);
}
return path;
}
}