bundles/org.eclipse.osgi/container/src/org/eclipse/osgi/storage/bundlefile/ZipBundleFile.java - equinox/rt.equinox.framework - Git at Google

 /*******************************************************************************
  * Copyright (c) 2005, 2018 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
  *     Rob Harrop - SpringSource Inc. (bug 253942)
  *******************************************************************************/

 package org.eclipse.osgi.storage.bundlefile;

 import java.io.File;
 import java.io.IOException;
 import java.io.InputStream;
 import java.util.Collections;
 import java.util.Enumeration;
 import java.util.LinkedHashSet;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.locks.Condition;
 import java.util.concurrent.locks.ReentrantLock;
 import java.util.zip.ZipEntry;
 import java.util.zip.ZipFile;
 import org.eclipse.osgi.container.ModuleContainerAdaptor.ContainerEvent;
 import org.eclipse.osgi.container.ModuleRevision;
 import org.eclipse.osgi.framework.log.FrameworkLogEntry;
 import org.eclipse.osgi.internal.debug.Debug;
 import org.eclipse.osgi.internal.framework.EquinoxContainer;
 import org.eclipse.osgi.internal.messages.Msg;
 import org.eclipse.osgi.storage.BundleInfo;
 import org.eclipse.osgi.util.NLS;

 /**
  * A BundleFile that uses a ZipFile as it base file.
  */
 public class ZipBundleFile extends BundleFile {

 	// A reentrant lock is used here (instead of intrinsic synchronization)
 	// to allow the lock conditional held
 	// see lockOpen() and getZipFile()
 	private final ReentrantLock openLock = new ReentrantLock();
 	private final Condition refCondition = openLock.newCondition();

 	private final MRUBundleFileList mruList;

 	private final BundleInfo.Generation generation;

 	private final Debug debug;
 	/**
 	 * The zip file
 	 */
 	private volatile ZipFile zipFile;
 	/**
 	 * The closed flag
 	 */
 	private volatile boolean closed = true;

 	private int referenceCount = 0;

 	public ZipBundleFile(File basefile, BundleInfo.Generation generation, MRUBundleFileList mruList, Debug debug) throws IOException {
 		super(basefile);
 		if (!BundleFile.secureAction.exists(basefile))
 			throw new IOException(NLS.bind(Msg.ADAPTER_FILEEXIST_EXCEPTION, basefile));
 		this.debug = debug;
 		this.generation = generation;
 		this.closed = true;
 		this.mruList = mruList;
 	}

 	/**
 	 * Checks if the zip file is open
 	 * @return true if the zip file is open
 	 */
 	private boolean lockOpen() {
 		try {
 			return getZipFile(true) != null;
 		} catch (IOException e) {
 			if (generation != null) {
 				ModuleRevision r = generation.getRevision();
 				if (r != null) {
 					ContainerEvent eventType = ContainerEvent.ERROR;
 					// If the revision has been removed from the list of revisions then it has been deleted
 					// because the bundle has been uninstalled or updated
 					if (!r.getRevisions().getModuleRevisions().contains(r)) {
 						// instead of filling the log with errors about missing files from
 						// uninstalled/updated bundles just give it an info level
 						eventType = ContainerEvent.INFO;
 					}
 					generation.getBundleInfo().getStorage().getAdaptor().publishContainerEvent(eventType, r.getRevisions().getModule(), e);
 				}
 			}
 			// TODO not sure if throwing a runtime exception is better
 			// throw new RuntimeException("Failed to open bundle file.", e);
 			return false;
 		}
 	}

 	/**
 	 * Opens the ZipFile for this bundle file
 	 * @return an open ZipFile for this bundle file
 	 * @throws IOException
 	 */
 	private ZipFile basicOpen() throws IOException {
 		return BundleFile.secureAction.getZipFile(this.basefile);
 	}

 	/**
 	 * Returns an open ZipFile for this bundle file.  If an open
 	 * ZipFile does not exist then a new one is created and
 	 * returned.
 	 * @param keepLock true if the open zip lock should be retained
 	 * @return an open ZipFile for this bundle
 	 * @throws IOException
 	 */
 	ZipFile getZipFile(boolean keepLock) throws IOException {
 		if (openLock.getHoldCount() != 0) {
 			ModuleRevision r = generation.getRevision();
 			if (r != null) {
 				// post an error about reentrant lock here
 				RuntimeException error = new RuntimeException("Must not re-enter openLock in getZipFile."); //$NON-NLS-1$
 				generation.getBundleInfo().getStorage().getAdaptor().publishContainerEvent(ContainerEvent.ERROR, r.getRevisions().getModule(), error);
 			}
 		}
 		if (closed) {
 			// do this outside the lock
 			mruListAdd();
 		}
 		openLock.lock();
 		try {
 			if (closed) {
 				zipFile = basicOpen();
 				closed = false;
 			} else {
 				mruListUse();
 			}
 			return zipFile;
 		} finally {
 			if (!keepLock || zipFile == null) {
 				openLock.unlock();
 			}
 		}
 	}

 	/**
 	* Returns a ZipEntry for the bundle file. Must be called while holding the monitor lock.
 	* This method does not ensure that the ZipFile is opened. Callers may need to call getZipfile() prior to calling this
 	* method.
 	* @param path the path to an entry
 	* @return a ZipEntry or null if the entry does not exist
 	*/
 	private ZipEntry getZipEntry(String path) {
 		if (path.length() > 0 && path.charAt(0) == '/')
 			path = path.substring(1);
 		ZipEntry entry = zipFile.getEntry(path);
 		if (entry != null && entry.getSize() == 0 && !entry.isDirectory()) {
 			// work around the directory bug see bug 83542
 			ZipEntry dirEntry = zipFile.getEntry(path + '/');
 			if (dirEntry != null)
 				entry = dirEntry;
 		}
 		return entry;
 	}

 	/**
 	 * Extracts a directory and all sub content to disk
 	 * @param dirName the directory name to extract
 	 * @return the File used to extract the content to.  A value
 	 * of <code>null</code> is returned if the directory to extract does
 	 * not exist or if content extraction is not supported.
 	 */
 	File extractDirectory(String dirName) {
 		if (!lockOpen()) {
 			return null;
 		}
 		try {
 			Enumeration<? extends ZipEntry> entries = zipFile.entries();
 			while (entries.hasMoreElements()) {
 				String entryPath = entries.nextElement().getName();
 				if (entryPath.startsWith(dirName) && !entryPath.endsWith("/")) //$NON-NLS-1$
 					getFile(entryPath, false);
 			}
 			return getExtractFile(dirName);
 		} finally {
 			openLock.unlock();
 		}
 	}

 	private File getExtractFile(String entryName) {
 		if (generation == null)
 			return null;
 		String path = ".cp"; /* put all these entries in this subdir *///$NON-NLS-1$
 		String name = entryName.replace('/', File.separatorChar);
 		if ((name.length() > 1) && (name.charAt(0) == File.separatorChar)) /* if name has a leading slash */
 			path = path.concat(name);
 		else
 			path = path + File.separator + name;
 		return generation.getExtractFile(path);
 	}

 	public File getFile(String entry, boolean nativeCode) {
 		if (!lockOpen()) {
 			return null;
 		}
 		try {
 			ZipEntry zipEntry = getZipEntry(entry);
 			if (zipEntry == null)
 				return null;

 			try {
 				File nested = getExtractFile(zipEntry.getName());
 				if (nested != null) {
 					if (nested.exists()) {
 						/* the entry is already cached */
 						if (debug.DEBUG_GENERAL)
 							Debug.println("File already present: " + nested.getPath()); //$NON-NLS-1$
 						if (nested.isDirectory())
 							// must ensure the complete directory is extracted (bug 182585)
 							extractDirectory(zipEntry.getName());
 					} else {
 						if (zipEntry.getName().endsWith("/")) { //$NON-NLS-1$
 							nested.mkdirs();
 							if (!nested.isDirectory()) {
 								if (debug.DEBUG_GENERAL)
 									Debug.println("Unable to create directory: " + nested.getPath()); //$NON-NLS-1$
 								throw new IOException(NLS.bind(Msg.ADAPTOR_DIRECTORY_CREATE_EXCEPTION, nested.getAbsolutePath()));
 							}
 							extractDirectory(zipEntry.getName());
 						} else {
 							InputStream in = zipFile.getInputStream(zipEntry);
 							if (in == null)
 								return null;
 							generation.storeContent(nested, in, nativeCode);
 						}
 					}

 					return nested;
 				}
 			} catch (IOException e) {
 				if (debug.DEBUG_GENERAL)
 					Debug.printStackTrace(e);
 				generation.getBundleInfo().getStorage().getLogServices().log(EquinoxContainer.NAME, FrameworkLogEntry.ERROR, "Unable to extract content: " + generation.getRevision() + ": " + entry, e); //$NON-NLS-1$ //$NON-NLS-2$
 			}
 		} finally {
 			openLock.unlock();
 		}
 		return null;
 	}

 	public boolean containsDir(String dir) {
 		if (!lockOpen()) {
 			return false;
 		}
 		try {
 			if (dir == null)
 				return false;

 			if (dir.length() == 0)
 				return true;

 			if (dir.charAt(0) == '/') {
 				if (dir.length() == 1)
 					return true;
 				dir = dir.substring(1);
 			}

 			if (dir.length() > 0 && dir.charAt(dir.length() - 1) != '/')
 				dir = dir + '/';

 			Enumeration<? extends ZipEntry> entries = zipFile.entries();
 			ZipEntry zipEntry;
 			String entryPath;
 			while (entries.hasMoreElements()) {
 				zipEntry = entries.nextElement();
 				entryPath = zipEntry.getName();
 				if (entryPath.startsWith(dir)) {
 					return true;
 				}
 			}
 		} finally {
 			openLock.unlock();
 		}
 		return false;
 	}

 	public BundleEntry getEntry(String path) {
 		if (!lockOpen()) {
 			return null;
 		}
 		try {
 			ZipEntry zipEntry = getZipEntry(path);
 			if (zipEntry == null) {
 				if (path.length() == 0 || path.charAt(path.length() - 1) == '/') {
 					// this is a directory request lets see if any entries exist in this directory
 					if (containsDir(path))
 						return new DirZipBundleEntry(this, path);
 				}
 				return null;
 			}

 			return new ZipBundleEntry(zipEntry, this);
 		} finally {
 			openLock.unlock();
 		}
 	}

 	@Override
 	public Enumeration<String> getEntryPaths(String path, boolean recurse) {
 		if (!lockOpen()) {
 			return null;
 		}
 		try {
 			if (path == null)
 				throw new NullPointerException();

 			// Strip any leading '/' off of path.
 			if (path.length() > 0 && path.charAt(0) == '/')
 				path = path.substring(1);
 			// Append a '/', if not already there, to path if not an empty string.
 			if (path.length() > 0 && path.charAt(path.length() - 1) != '/')
 				path = new StringBuilder(path).append("/").toString(); //$NON-NLS-1$

 			LinkedHashSet<String> result = new LinkedHashSet<>();
 			// Get all zip file entries and add the ones of interest.
 			Enumeration<? extends ZipEntry> entries = zipFile.entries();
 			while (entries.hasMoreElements()) {
 				ZipEntry zipEntry = entries.nextElement();
 				String entryPath = zipEntry.getName();
 				// Is the entry of possible interest? Note that
 				// string.startsWith("") == true.
 				if (entryPath.startsWith(path)) {
 					// If we get here, we know that the entry is either (1) equal to
 					// path, (2) a file under path, or (3) a subdirectory of path.
 					if (path.length() < entryPath.length()) {
 						// If we get here, we know that entry is not equal to path.
 						getEntryPaths(path, entryPath.substring(path.length()), recurse, result);
 					}
 				}
 			}
 			return result.size() == 0 ? null : Collections.enumeration(result);
 		} finally {
 			openLock.unlock();
 		}
 	}

 	private void getEntryPaths(String path, String entry, boolean recurse, LinkedHashSet<String> entries) {
 		if (entry.length() == 0)
 			return;
 		int slash = entry.indexOf('/');
 		if (slash == -1)
 			entries.add(path + entry);
 		else {
 			path = path + entry.substring(0, slash + 1);
 			entries.add(path);
 			if (recurse)
 				getEntryPaths(path, entry.substring(slash + 1), true, entries);
 		}
 	}

 	public void close() throws IOException {
 		openLock.lock();
 		try {
 			if (!closed) {
 				if (referenceCount > 0 && isMruListClosing()) {
 					// there are some opened streams to this BundleFile still;
 					// wait for them all to close because this is being closed by the MRUBundleFileList
 					try {
 						refCondition.await(1000, TimeUnit.MICROSECONDS); // timeout after 1 second
 					} catch (InterruptedException e) {
 						// do nothing for now ...
 					}
 					if (referenceCount != 0 || closed)
 						// either another thread closed the bundle file or we timed waiting for all the reference inputstreams to close
 						// If the referenceCount did not reach zero then this bundle file will remain open until the
 						// bundle file is closed explicitly (i.e. bundle is updated/uninstalled or framework is shutdown)
 						return;

 				}
 				closed = true;
 				zipFile.close();
 				mruListRemove();
 			}
 		} finally {
 			openLock.unlock();
 		}
 	}

 	private boolean isMruListClosing() {
 		return this.mruList != null && this.mruList.isClosing(this);
 	}

 	boolean isMruEnabled() {
 		return this.mruList != null && this.mruList.isEnabled();
 	}

 	private void mruListRemove() {
 		if (this.mruList != null) {
 			this.mruList.remove(this);
 		}
 	}

 	private void mruListUse() {
 		if (this.mruList != null) {
 			mruList.use(this);
 		}
 	}

 	private void mruListAdd() {
 		if (this.mruList != null) {
 			mruList.add(this);
 		}
 	}

 	public void open() throws IOException {
 		getZipFile(false);
 	}

 	void incrementReference() {
 		openLock.lock();
 		try {
 			referenceCount += 1;
 		} finally {
 			openLock.unlock();
 		}
 	}

 	void decrementReference() {
 		openLock.lock();
 		try {
 			referenceCount = Math.max(0, referenceCount - 1);
 			// only notify if the referenceCount is zero.
 			if (referenceCount == 0)
 				refCondition.signal();
 		} finally {
 			openLock.unlock();
 		}
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2005, 2018 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
	* Rob Harrop - SpringSource Inc. (bug 253942)
	*******************************************************************************/

	package org.eclipse.osgi.storage.bundlefile;

	import java.io.File;
	import java.io.IOException;
	import java.io.InputStream;
	import java.util.Collections;
	import java.util.Enumeration;
	import java.util.LinkedHashSet;
	import java.util.concurrent.TimeUnit;
	import java.util.concurrent.locks.Condition;
	import java.util.concurrent.locks.ReentrantLock;
	import java.util.zip.ZipEntry;
	import java.util.zip.ZipFile;
	import org.eclipse.osgi.container.ModuleContainerAdaptor.ContainerEvent;
	import org.eclipse.osgi.container.ModuleRevision;
	import org.eclipse.osgi.framework.log.FrameworkLogEntry;
	import org.eclipse.osgi.internal.debug.Debug;
	import org.eclipse.osgi.internal.framework.EquinoxContainer;
	import org.eclipse.osgi.internal.messages.Msg;
	import org.eclipse.osgi.storage.BundleInfo;
	import org.eclipse.osgi.util.NLS;

	/**
	* A BundleFile that uses a ZipFile as it base file.
	*/
	public class ZipBundleFile extends BundleFile {

	// A reentrant lock is used here (instead of intrinsic synchronization)
	// to allow the lock conditional held
	// see lockOpen() and getZipFile()
	private final ReentrantLock openLock = new ReentrantLock();
	private final Condition refCondition = openLock.newCondition();

	private final MRUBundleFileList mruList;

	private final BundleInfo.Generation generation;

	private final Debug debug;
	/**
	* The zip file
	*/
	private volatile ZipFile zipFile;
	/**
	* The closed flag
	*/
	private volatile boolean closed = true;

	private int referenceCount = 0;

	public ZipBundleFile(File basefile, BundleInfo.Generation generation, MRUBundleFileList mruList, Debug debug) throws IOException {
	super(basefile);
	if (!BundleFile.secureAction.exists(basefile))
	throw new IOException(NLS.bind(Msg.ADAPTER_FILEEXIST_EXCEPTION, basefile));
	this.debug = debug;
	this.generation = generation;
	this.closed = true;
	this.mruList = mruList;
	}

	/**
	* Checks if the zip file is open
	* @return true if the zip file is open
	*/
	private boolean lockOpen() {
	try {
	return getZipFile(true) != null;
	} catch (IOException e) {
	if (generation != null) {
	ModuleRevision r = generation.getRevision();
	if (r != null) {
	ContainerEvent eventType = ContainerEvent.ERROR;
	// If the revision has been removed from the list of revisions then it has been deleted
	// because the bundle has been uninstalled or updated
	if (!r.getRevisions().getModuleRevisions().contains(r)) {
	// instead of filling the log with errors about missing files from
	// uninstalled/updated bundles just give it an info level
	eventType = ContainerEvent.INFO;
	}
	generation.getBundleInfo().getStorage().getAdaptor().publishContainerEvent(eventType, r.getRevisions().getModule(), e);
	}
	}
	// TODO not sure if throwing a runtime exception is better
	// throw new RuntimeException("Failed to open bundle file.", e);
	return false;
	}
	}

	/**
	* Opens the ZipFile for this bundle file
	* @return an open ZipFile for this bundle file
	* @throws IOException
	*/
	private ZipFile basicOpen() throws IOException {
	return BundleFile.secureAction.getZipFile(this.basefile);
	}

	/**
	* Returns an open ZipFile for this bundle file. If an open
	* ZipFile does not exist then a new one is created and
	* returned.
	* @param keepLock true if the open zip lock should be retained
	* @return an open ZipFile for this bundle
	* @throws IOException
	*/
	ZipFile getZipFile(boolean keepLock) throws IOException {
	if (openLock.getHoldCount() != 0) {
	ModuleRevision r = generation.getRevision();
	if (r != null) {
	// post an error about reentrant lock here
	RuntimeException error = new RuntimeException("Must not re-enter openLock in getZipFile."); //$NON-NLS-1$
	generation.getBundleInfo().getStorage().getAdaptor().publishContainerEvent(ContainerEvent.ERROR, r.getRevisions().getModule(), error);
	}
	}
	if (closed) {
	// do this outside the lock
	mruListAdd();
	}
	openLock.lock();
	try {
	if (closed) {
	zipFile = basicOpen();
	closed = false;
	} else {
	mruListUse();
	}
	return zipFile;
	} finally {
	if (!keepLock \|\| zipFile == null) {
	openLock.unlock();
	}
	}
	}

	/**
	* Returns a ZipEntry for the bundle file. Must be called while holding the monitor lock.
	* This method does not ensure that the ZipFile is opened. Callers may need to call getZipfile() prior to calling this
	* method.
	* @param path the path to an entry
	* @return a ZipEntry or null if the entry does not exist
	*/
	private ZipEntry getZipEntry(String path) {
	if (path.length() > 0 && path.charAt(0) == '/')
	path = path.substring(1);
	ZipEntry entry = zipFile.getEntry(path);
	if (entry != null && entry.getSize() == 0 && !entry.isDirectory()) {
	// work around the directory bug see bug 83542
	ZipEntry dirEntry = zipFile.getEntry(path + '/');
	if (dirEntry != null)
	entry = dirEntry;
	}
	return entry;
	}

	/**
	* Extracts a directory and all sub content to disk
	* @param dirName the directory name to extract
	* @return the File used to extract the content to. A value
	* of <code>null</code> is returned if the directory to extract does
	* not exist or if content extraction is not supported.
	*/
	File extractDirectory(String dirName) {
	if (!lockOpen()) {
	return null;
	}
	try {
	Enumeration<? extends ZipEntry> entries = zipFile.entries();
	while (entries.hasMoreElements()) {
	String entryPath = entries.nextElement().getName();
	if (entryPath.startsWith(dirName) && !entryPath.endsWith("/")) //$NON-NLS-1$
	getFile(entryPath, false);
	}
	return getExtractFile(dirName);
	} finally {
	openLock.unlock();
	}
	}

	private File getExtractFile(String entryName) {
	if (generation == null)
	return null;
	String path = ".cp"; /* put all these entries in this subdir *///$NON-NLS-1$
	String name = entryName.replace('/', File.separatorChar);
	if ((name.length() > 1) && (name.charAt(0) == File.separatorChar)) /* if name has a leading slash */
	path = path.concat(name);
	else
	path = path + File.separator + name;
	return generation.getExtractFile(path);
	}

	public File getFile(String entry, boolean nativeCode) {
	if (!lockOpen()) {
	return null;
	}
	try {
	ZipEntry zipEntry = getZipEntry(entry);
	if (zipEntry == null)
	return null;

	try {
	File nested = getExtractFile(zipEntry.getName());
	if (nested != null) {
	if (nested.exists()) {
	/* the entry is already cached */
	if (debug.DEBUG_GENERAL)
	Debug.println("File already present: " + nested.getPath()); //$NON-NLS-1$
	if (nested.isDirectory())
	// must ensure the complete directory is extracted (bug 182585)
	extractDirectory(zipEntry.getName());
	} else {
	if (zipEntry.getName().endsWith("/")) { //$NON-NLS-1$
	nested.mkdirs();
	if (!nested.isDirectory()) {
	if (debug.DEBUG_GENERAL)
	Debug.println("Unable to create directory: " + nested.getPath()); //$NON-NLS-1$
	throw new IOException(NLS.bind(Msg.ADAPTOR_DIRECTORY_CREATE_EXCEPTION, nested.getAbsolutePath()));
	}
	extractDirectory(zipEntry.getName());
	} else {
	InputStream in = zipFile.getInputStream(zipEntry);
	if (in == null)
	return null;
	generation.storeContent(nested, in, nativeCode);
	}
	}

	return nested;
	}
	} catch (IOException e) {
	if (debug.DEBUG_GENERAL)
	Debug.printStackTrace(e);
	generation.getBundleInfo().getStorage().getLogServices().log(EquinoxContainer.NAME, FrameworkLogEntry.ERROR, "Unable to extract content: " + generation.getRevision() + ": " + entry, e); //$NON-NLS-1$ //$NON-NLS-2$
	}
	} finally {
	openLock.unlock();
	}
	return null;
	}

	public boolean containsDir(String dir) {
	if (!lockOpen()) {
	return false;
	}
	try {
	if (dir == null)
	return false;

	if (dir.length() == 0)
	return true;

	if (dir.charAt(0) == '/') {
	if (dir.length() == 1)
	return true;
	dir = dir.substring(1);
	}

	if (dir.length() > 0 && dir.charAt(dir.length() - 1) != '/')
	dir = dir + '/';

	Enumeration<? extends ZipEntry> entries = zipFile.entries();
	ZipEntry zipEntry;
	String entryPath;
	while (entries.hasMoreElements()) {
	zipEntry = entries.nextElement();
	entryPath = zipEntry.getName();
	if (entryPath.startsWith(dir)) {
	return true;
	}
	}
	} finally {
	openLock.unlock();
	}
	return false;
	}

	public BundleEntry getEntry(String path) {
	if (!lockOpen()) {
	return null;
	}
	try {
	ZipEntry zipEntry = getZipEntry(path);
	if (zipEntry == null) {
	if (path.length() == 0 \|\| path.charAt(path.length() - 1) == '/') {
	// this is a directory request lets see if any entries exist in this directory
	if (containsDir(path))
	return new DirZipBundleEntry(this, path);
	}
	return null;
	}

	return new ZipBundleEntry(zipEntry, this);
	} finally {
	openLock.unlock();
	}
	}

	@Override
	public Enumeration<String> getEntryPaths(String path, boolean recurse) {
	if (!lockOpen()) {
	return null;
	}
	try {
	if (path == null)
	throw new NullPointerException();

	// Strip any leading '/' off of path.
	if (path.length() > 0 && path.charAt(0) == '/')
	path = path.substring(1);
	// Append a '/', if not already there, to path if not an empty string.
	if (path.length() > 0 && path.charAt(path.length() - 1) != '/')
	path = new StringBuilder(path).append("/").toString(); //$NON-NLS-1$

	LinkedHashSet<String> result = new LinkedHashSet<>();
	// Get all zip file entries and add the ones of interest.
	Enumeration<? extends ZipEntry> entries = zipFile.entries();
	while (entries.hasMoreElements()) {
	ZipEntry zipEntry = entries.nextElement();
	String entryPath = zipEntry.getName();
	// Is the entry of possible interest? Note that
	// string.startsWith("") == true.
	if (entryPath.startsWith(path)) {
	// If we get here, we know that the entry is either (1) equal to
	// path, (2) a file under path, or (3) a subdirectory of path.
	if (path.length() < entryPath.length()) {
	// If we get here, we know that entry is not equal to path.
	getEntryPaths(path, entryPath.substring(path.length()), recurse, result);
	}
	}
	}
	return result.size() == 0 ? null : Collections.enumeration(result);
	} finally {
	openLock.unlock();
	}
	}

	private void getEntryPaths(String path, String entry, boolean recurse, LinkedHashSet<String> entries) {
	if (entry.length() == 0)
	return;
	int slash = entry.indexOf('/');
	if (slash == -1)
	entries.add(path + entry);
	else {
	path = path + entry.substring(0, slash + 1);
	entries.add(path);
	if (recurse)
	getEntryPaths(path, entry.substring(slash + 1), true, entries);
	}
	}

	public void close() throws IOException {
	openLock.lock();
	try {
	if (!closed) {
	if (referenceCount > 0 && isMruListClosing()) {
	// there are some opened streams to this BundleFile still;
	// wait for them all to close because this is being closed by the MRUBundleFileList
	try {
	refCondition.await(1000, TimeUnit.MICROSECONDS); // timeout after 1 second
	} catch (InterruptedException e) {
	// do nothing for now ...
	}
	if (referenceCount != 0 \|\| closed)
	// either another thread closed the bundle file or we timed waiting for all the reference inputstreams to close
	// If the referenceCount did not reach zero then this bundle file will remain open until the
	// bundle file is closed explicitly (i.e. bundle is updated/uninstalled or framework is shutdown)
	return;

	}
	closed = true;
	zipFile.close();
	mruListRemove();
	}
	} finally {
	openLock.unlock();
	}
	}

	private boolean isMruListClosing() {
	return this.mruList != null && this.mruList.isClosing(this);
	}

	boolean isMruEnabled() {
	return this.mruList != null && this.mruList.isEnabled();
	}

	private void mruListRemove() {
	if (this.mruList != null) {
	this.mruList.remove(this);
	}
	}

	private void mruListUse() {
	if (this.mruList != null) {
	mruList.use(this);
	}
	}

	private void mruListAdd() {
	if (this.mruList != null) {
	mruList.add(this);
	}
	}

	public void open() throws IOException {
	getZipFile(false);
	}

	void incrementReference() {
	openLock.lock();
	try {
	referenceCount += 1;
	} finally {
	openLock.unlock();
	}
	}

	void decrementReference() {
	openLock.lock();
	try {
	referenceCount = Math.max(0, referenceCount - 1);
	// only notify if the referenceCount is zero.
	if (referenceCount == 0)
	refCondition.signal();
	} finally {
	openLock.unlock();
	}
	}
	}