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/*
* Copyright (c) 2007 through 2024 David Berkman
*
* This file is part of the SmallMind Code Project.
*
* The SmallMind Code Project is free software, you can redistribute
* it and/or modify it under either, at your discretion...
*
* 1) The terms of GNU Affero General Public License as published by the
* Free Software Foundation, either version 3 of the License, or (at
* your option) any later version.
*
* ...or...
*
* 2) The terms of the Apache License, Version 2.0.
*
* The SmallMind Code Project 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 or Apache License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* and the Apache License along with the SmallMind Code Project. If not, see
* .
*
* Additional permission under the GNU Affero GPL version 3 section 7
* ------------------------------------------------------------------
* If you modify this Program, or any covered work, by linking or
* combining it with other code, such other code is not for that reason
* alone subject to any of the requirements of the GNU Affero GPL
* version 3.
*/
package org.smallmind.file.ephemeral;
import java.io.IOException;
import java.nio.channels.SeekableByteChannel;
import java.nio.file.ClosedFileSystemException;
import java.nio.file.CopyOption;
import java.nio.file.DirectoryNotEmptyException;
import java.nio.file.DirectoryStream;
import java.nio.file.FileAlreadyExistsException;
import java.nio.file.FileStore;
import java.nio.file.LinkOption;
import java.nio.file.NoSuchFileException;
import java.nio.file.NotDirectoryException;
import java.nio.file.OpenOption;
import java.nio.file.Path;
import java.nio.file.SecureDirectoryStream;
import java.nio.file.StandardCopyOption;
import java.nio.file.StandardOpenOption;
import java.nio.file.attribute.BasicFileAttributeView;
import java.nio.file.attribute.BasicFileAttributes;
import java.nio.file.attribute.FileAttribute;
import java.nio.file.attribute.FileAttributeView;
import java.nio.file.attribute.FileStoreAttributeView;
import java.nio.file.attribute.FileTime;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import org.smallmind.file.ephemeral.heap.DirectoryNode;
import org.smallmind.file.ephemeral.heap.FileNode;
import org.smallmind.file.ephemeral.heap.HeapEventListener;
import org.smallmind.file.ephemeral.heap.HeapNode;
import org.smallmind.file.ephemeral.heap.HeapNodeType;
import org.smallmind.nutsnbolts.io.ByteArrayIOBuffer;
import org.smallmind.nutsnbolts.lang.UnknownSwitchCaseException;
public class EphemeralFileStore extends FileStore {
private static final Map> SUPPORTED_FILE_ATTRIBUTE_VIEW_MAP = Map.of("basic", BasicFileAttributeView.class);
private static final String[] BASIC_FILE_ATTRIBUTE_NAMES = new String[] {"creationTime", "lastModifiedTime", "lastAccessTime", "isDirectory", "isRegularFile", "isSymbolicLink", "isOther", "size", "fileKey"};
private final EphemeralFileSystem fileSystem;
private final EphemeralFileStoreAttributeView fileStoreAttributeView = new EphemeralFileStoreAttributeView();
private final DirectoryNode rootNode = new DirectoryNode(null, null);
private final long capacity;
private final int blockSize;
public EphemeralFileStore (EphemeralFileSystem fileSystem, long capacity, int blockSize) {
if ((capacity <= 0) || (blockSize <= 0)) {
throw new IllegalArgumentException("Both capacity and block size must be > 0");
}
this.fileSystem = fileSystem;
this.capacity = capacity;
this.blockSize = blockSize;
}
@Override
public String name () {
return EphemeralFileStore.class.getSimpleName();
}
@Override
public String type () {
return name();
}
@Override
public boolean isReadOnly () {
return false;
}
@Override
public long getTotalSpace () {
if (!fileSystem.isOpen()) {
throw new ClosedFileSystemException();
} else {
return getUsableSpace();
}
}
@Override
public long getUsableSpace () {
if (!fileSystem.isOpen()) {
throw new ClosedFileSystemException();
} else {
return capacity;
}
}
@Override
public synchronized long getUnallocatedSpace () {
if (!fileSystem.isOpen()) {
throw new ClosedFileSystemException();
} else {
return capacity - rootNode.size();
}
}
@Override
public boolean supportsFileAttributeView (Class type) {
if (!fileSystem.isOpen()) {
throw new ClosedFileSystemException();
} else {
return SUPPORTED_FILE_ATTRIBUTE_VIEW_MAP.containsValue(type);
}
}
@Override
public boolean supportsFileAttributeView (String name) {
if (!fileSystem.isOpen()) {
throw new ClosedFileSystemException();
} else {
return SUPPORTED_FILE_ATTRIBUTE_VIEW_MAP.containsKey(name);
}
}
public Set getSupportedFileAttributeViewNames () {
if (!fileSystem.isOpen()) {
throw new ClosedFileSystemException();
} else {
return SUPPORTED_FILE_ATTRIBUTE_VIEW_MAP.keySet();
}
}
@Override
public V getFileStoreAttributeView (Class type) {
if (!fileSystem.isOpen()) {
throw new ClosedFileSystemException();
} else {
return EphemeralFileStoreAttributeView.class.equals(type) ? type.cast(fileStoreAttributeView) : null;
}
}
public synchronized V getFileAttributeView (EphemeralPath path, Class type, LinkOption... options)
throws NoSuchFileException {
if (!fileSystem.isOpen()) {
throw new ClosedFileSystemException();
} else if (!SUPPORTED_FILE_ATTRIBUTE_VIEW_MAP.containsValue(type)) {
return null;
} else {
HeapNode heapNode;
return ((heapNode = findNode(path)) != null) ? type.cast(new EphemeralBasicFileAttributeView(heapNode.getAttributes())) : null;
}
}
public synchronized A readAttributes (EphemeralPath path, Class type, LinkOption... options)
throws NoSuchFileException {
if (!fileSystem.isOpen()) {
throw new ClosedFileSystemException();
} else if (!type.isAssignableFrom(EphemeralBasicFileAttributes.class)) {
throw new UnsupportedOperationException(type.getName());
} else {
HeapNode heapNode;
return ((heapNode = findNode(path)) != null) ? type.cast(heapNode.getAttributes()) : null;
}
}
public synchronized Map readAttributes (EphemeralPath path, String attributes, LinkOption... options)
throws NoSuchFileException {
if (!fileSystem.isOpen()) {
throw new ClosedFileSystemException();
} else {
HeapNode heapNode;
String[] attributeNames;
String viewName;
boolean asterisk = false;
int colonPos;
if ((colonPos = attributes.indexOf(':')) >= 0) {
if (!SUPPORTED_FILE_ATTRIBUTE_VIEW_MAP.containsKey(viewName = attributes.substring(0, colonPos))) {
throw new UnsupportedOperationException(viewName);
}
attributeNames = attributes.substring(colonPos + 1).split(",");
} else {
attributeNames = attributes.split(",");
}
for (int index = 0; index < attributeNames.length; index++) {
attributeNames[index] = attributeNames[index].strip();
if (!asterisk) {
if (attributeNames[index].indexOf('*') >= 0) {
asterisk = true;
}
}
}
if (asterisk) {
attributeNames = BASIC_FILE_ATTRIBUTE_NAMES;
}
if ((heapNode = findNode(path)) == null) {
throw new NoSuchFileException(path.toString());
} else {
EphemeralBasicFileAttributes fileAttributes = heapNode.getAttributes();
HashMap attributeMap = new HashMap<>();
for (String attributeName : attributeNames) {
switch (attributeName) {
case "creationTime":
attributeMap.put("creationTime", fileAttributes.creationTime());
break;
case "lastModifiedTime":
attributeMap.put("lastModifiedTime", fileAttributes.lastModifiedTime());
break;
case "lastAccessTime":
attributeMap.put("lastAccessTime", fileAttributes.lastAccessTime());
break;
case "isDirectory":
attributeMap.put("isDirectory", fileAttributes.isDirectory());
break;
case "isRegularFile":
attributeMap.put("isRegularFile", fileAttributes.isRegularFile());
break;
case "isSymbolicLink":
attributeMap.put("isSymbolicLink", fileAttributes.isSymbolicLink());
break;
case "isOther":
attributeMap.put("isOther", fileAttributes.isOther());
break;
case "size":
attributeMap.put("size", fileAttributes.size());
break;
case "fileKey":
attributeMap.put("fileKey", fileAttributes.fileKey());
break;
}
}
return attributeMap;
}
}
}
public synchronized void setAttribute (EphemeralPath path, String attribute, Object value, LinkOption... options)
throws NoSuchFileException {
if (!fileSystem.isOpen()) {
throw new ClosedFileSystemException();
} else {
HeapNode heapNode;
String attributeName;
String viewName;
int colonPos;
if ((colonPos = attribute.indexOf(':')) >= 0) {
if (!SUPPORTED_FILE_ATTRIBUTE_VIEW_MAP.containsKey(viewName = attribute.substring(0, colonPos))) {
throw new UnsupportedOperationException(viewName);
}
attributeName = attribute.substring(colonPos + 1);
} else {
attributeName = attribute;
}
if ((heapNode = findNode(path)) == null) {
throw new NoSuchFileException(path.toString());
} else {
EphemeralBasicFileAttributes fileAttributes = heapNode.getAttributes();
switch (attributeName) {
case "creationTime":
fileAttributes.setCreationTime((FileTime)value);
break;
case "lastModifiedTime":
fileAttributes.setLastModifiedTime((FileTime)value);
break;
case "lastAccessTime":
fileAttributes.setLastAccessTime((FileTime)value);
break;
}
}
}
}
@Override
public Object getAttribute (String attribute)
throws IOException {
if (!fileSystem.isOpen()) {
throw new ClosedFileSystemException();
} else {
int colonPos;
if ((colonPos = attribute.indexOf(':')) < 0) {
throw new IllegalArgumentException(attribute);
} else {
if (fileStoreAttributeView.name().equals(attribute.substring(0, colonPos))) {
try {
return fileStoreAttributeView.getClass().getDeclaredField(attribute.substring(colonPos + 1)).get(fileStoreAttributeView);
} catch (NoSuchFieldException | IllegalAccessException exception) {
throw new IOException(exception);
}
} else {
return null;
}
}
}
}
public synchronized void registerHeapListener (EphemeralPath path, HeapEventListener listener)
throws NoSuchFileException, NotDirectoryException {
if (!fileSystem.isOpen()) {
throw new ClosedFileSystemException();
} else {
HeapNode node;
if (((node = findNode(path)) == null) || (!HeapNodeType.DIRECTORY.equals(node.getType()))) {
throw new NotDirectoryException(path.toString());
} else {
node.registerListener(listener);
}
}
}
public synchronized void unregisterHeapListener (EphemeralPath path, HeapEventListener listener)
throws NoSuchFileException {
if (!fileSystem.isOpen()) {
throw new ClosedFileSystemException();
} else {
HeapNode node;
if ((node = findNode(path)) != null) {
node.unregisterListener(listener);
}
}
}
public synchronized void checkAccess (EphemeralPath path)
throws NoSuchFileException {
if (findNode(path) == null) {
throw new NoSuchFileException(path.toString());
}
}
public synchronized SecureDirectoryStream newDirectoryStream (EphemeralPath dir, DirectoryStream.Filter filter, LinkOption... options)
throws NoSuchFileException, NotDirectoryException {
if (!fileSystem.isOpen()) {
throw new ClosedFileSystemException();
} else {
HeapNode heapNode;
if (((heapNode = findNode(dir)) == null) || (!HeapNodeType.DIRECTORY.equals(heapNode.getType()))) {
throw new NotDirectoryException(dir.toString());
} else {
return new EphemeralDirectoryStream(fileSystem.provider(), dir, (DirectoryNode)heapNode, filter);
}
}
}
public synchronized void createDirectory (EphemeralPath path, FileAttribute... attrs)
throws NoSuchFileException, FileAlreadyExistsException {
if (!fileSystem.isOpen()) {
throw new ClosedFileSystemException();
} else {
for (FileAttribute attribute : attrs) {
if (!"posix:permissions".equals(attribute.name())) {
throw new UnsupportedOperationException("Only posix permission file attributes are supported");
}
}
if (path.getNameCount() > 0) {
EphemeralPath parentPath;
HeapNode parentNode;
if ((parentNode = findNode(parentPath = path.getParent())) == null) {
throw new NoSuchFileException(parentPath.toString());
} else {
switch (parentNode.getType()) {
case FILE:
throw new NoSuchFileException(path.toString());
case DIRECTORY:
if (((DirectoryNode)parentNode).exists(path.getNames()[path.getNameCount() - 1])) {
throw new FileAlreadyExistsException(path.toString());
} else {
((DirectoryNode)parentNode).put(new DirectoryNode((DirectoryNode)parentNode, path.getNames()[path.getNameCount() - 1]));
}
break;
default:
throw new UnknownSwitchCaseException(parentNode.getType().name());
}
}
}
}
}
public synchronized void delete (EphemeralPath path)
throws IOException {
if (!fileSystem.isOpen()) {
throw new ClosedFileSystemException();
} else {
HeapNode heapNode;
if (path.getNameCount() == 0) {
throw new IOException("Not allowed");
} else if ((heapNode = findNode(path)) == null) {
throw new NoSuchFileException(path.toString());
} else {
switch (heapNode.getType()) {
case FILE:
heapNode.getParent().remove(heapNode.getName());
break;
case DIRECTORY:
if (!((DirectoryNode)heapNode).isEmpty()) {
throw new DirectoryNotEmptyException(path.toString());
} else {
heapNode.getParent().remove(heapNode.getName());
}
break;
default:
throw new UnknownSwitchCaseException(heapNode.getType().name());
}
}
}
}
public synchronized void copy (EphemeralPath source, EphemeralPath target, CopyOption... options)
throws IOException {
if (!source.equals(target)) {
HeapNode sourceNode;
boolean replaceExisting = false;
for (CopyOption option : options) {
if (!(option instanceof StandardCopyOption)) {
throw new UnsupportedOperationException("Only standard open options are supported");
} else if (StandardCopyOption.REPLACE_EXISTING.equals(option)) {
replaceExisting = true;
}
}
if ((sourceNode = findNode(source)) == null) {
throw new NoSuchFileException(source.toString());
} else {
HeapNode targetNode;
HeapNode parentOfTargetNode = null;
if ((targetNode = findNode(target)) == null) {
EphemeralPath parentOfTargetPath;
if ((parentOfTargetNode = findNode(parentOfTargetPath = target.getParent())) == null) {
throw new NoSuchFileException(parentOfTargetPath.toString());
}
}
switch (sourceNode.getType()) {
case FILE:
if (targetNode != null) {
switch (targetNode.getType()) {
case FILE:
if (!replaceExisting) {
throw new FileAlreadyExistsException(target.toString());
} else {
// all sorts of nasty race condition, need ByteArrayIOBuffer to self-encapsulate and synchronize
targetNode.getParent().put(new FileNode(targetNode.getParent(), targetNode.getName(), new ByteArrayIOBuffer(((FileNode)sourceNode).getSegmentBuffer())));
}
break;
case DIRECTORY:
if (((DirectoryNode)targetNode).exists(sourceNode.getName()) && (!replaceExisting)) {
throw new FileAlreadyExistsException(target.resolve(source.getFileName()).toString());
} else {
// all sorts of nasty race condition, need ByteArrayIOBuffer to self-encapsulate and synchronize
((DirectoryNode)targetNode).put(new FileNode((DirectoryNode)targetNode, sourceNode.getName(), new ByteArrayIOBuffer(((FileNode)sourceNode).getSegmentBuffer())));
}
break;
default:
throw new UnknownSwitchCaseException(targetNode.getType().name());
}
} else {
switch (parentOfTargetNode.getType()) {
case FILE:
throw new NoSuchFileException(target.toString());
case DIRECTORY:
// all sorts of nasty race condition, need ByteArrayIOBuffer to self-encapsulate and synchronize
((DirectoryNode)parentOfTargetNode).put(new FileNode((DirectoryNode)parentOfTargetNode, target.getNames()[target.getNameCount() - 1], new ByteArrayIOBuffer(((FileNode)sourceNode).getSegmentBuffer())));
break;
default:
throw new UnknownSwitchCaseException(parentOfTargetNode.getType().name());
}
}
break;
case DIRECTORY:
if (targetNode != null) {
switch (targetNode.getType()) {
case FILE:
throw new FileAlreadyExistsException(target.toString());
case DIRECTORY:
if (targetNode.getParent() == null) {
throw new IOException("Not Allowed");
} else if (!((DirectoryNode)targetNode).isEmpty()) {
throw new DirectoryNotEmptyException(target.toString());
} else if (!replaceExisting) {
throw new FileAlreadyExistsException(target.toString());
} else {
targetNode.getParent().put(new DirectoryNode(targetNode.getParent(), sourceNode.getName()));
targetNode.getParent().remove(targetNode.getName());
}
break;
default:
throw new UnknownSwitchCaseException(targetNode.getType().name());
}
} else {
switch (parentOfTargetNode.getType()) {
case FILE:
throw new NoSuchFileException(target.toString());
case DIRECTORY:
((DirectoryNode)parentOfTargetNode).put(new DirectoryNode((DirectoryNode)parentOfTargetNode, sourceNode.getName()));
break;
default:
throw new UnknownSwitchCaseException(parentOfTargetNode.getType().name());
}
}
break;
default:
throw new UnknownSwitchCaseException(sourceNode.getType().name());
}
}
}
}
public synchronized void move (EphemeralPath source, EphemeralPath target, CopyOption... options)
throws IOException {
if (!source.equals(target)) {
HeapNode sourceNode;
boolean replaceExisting = false;
for (CopyOption option : options) {
if (!(option instanceof StandardCopyOption)) {
throw new UnsupportedOperationException("Only standard open options are supported");
} else if (StandardCopyOption.REPLACE_EXISTING.equals(option)) {
replaceExisting = true;
}
}
if ((sourceNode = findNode(source)) == null) {
throw new NoSuchFileException(source.toString());
} else {
HeapNode targetNode;
HeapNode parentOfTargetNode = null;
if ((targetNode = findNode(target)) == null) {
EphemeralPath parentOfTargetPath;
if ((parentOfTargetNode = findNode(parentOfTargetPath = target.getParent())) == null) {
throw new NoSuchFileException(parentOfTargetPath.toString());
}
}
switch (sourceNode.getType()) {
case FILE:
if (targetNode != null) {
switch (targetNode.getType()) {
case FILE:
if (!replaceExisting) {
throw new FileAlreadyExistsException(target.toString());
} else {
targetNode.getParent().put(new FileNode(targetNode.getParent(), targetNode.getName(), ((FileNode)sourceNode).getSegmentBuffer()));
}
break;
case DIRECTORY:
if (((DirectoryNode)targetNode).exists(sourceNode.getName()) && (!replaceExisting)) {
throw new FileAlreadyExistsException(target.resolve(source.getFileName()).toString());
} else {
((DirectoryNode)targetNode).put(new FileNode((DirectoryNode)targetNode, sourceNode.getName(), ((FileNode)sourceNode).getSegmentBuffer()));
}
break;
default:
throw new UnknownSwitchCaseException(targetNode.getType().name());
}
} else {
switch (parentOfTargetNode.getType()) {
case FILE:
throw new NoSuchFileException(target.toString());
case DIRECTORY:
((DirectoryNode)parentOfTargetNode).put(new FileNode((DirectoryNode)parentOfTargetNode, target.getNames()[target.getNameCount() - 1], ((FileNode)sourceNode).getSegmentBuffer()));
break;
default:
throw new UnknownSwitchCaseException(parentOfTargetNode.getType().name());
}
}
break;
case DIRECTORY:
if (targetNode != null) {
switch (targetNode.getType()) {
case FILE:
throw new FileAlreadyExistsException(target.toString());
case DIRECTORY:
if (targetNode.getParent() == null) {
throw new IOException("Not Allowed");
} else if (!((DirectoryNode)targetNode).isEmpty()) {
throw new DirectoryNotEmptyException(target.toString());
} else if (!replaceExisting) {
throw new FileAlreadyExistsException(target.toString());
} else {
targetNode.getParent().put(new DirectoryNode(targetNode.getParent(), sourceNode.getName()));
targetNode.getParent().remove(targetNode.getName());
}
break;
default:
throw new UnknownSwitchCaseException(targetNode.getType().name());
}
} else {
switch (parentOfTargetNode.getType()) {
case FILE:
throw new NoSuchFileException(target.toString());
case DIRECTORY:
((DirectoryNode)parentOfTargetNode).put(new DirectoryNode((DirectoryNode)parentOfTargetNode, sourceNode.getName()));
break;
default:
throw new UnknownSwitchCaseException(parentOfTargetNode.getType().name());
}
}
break;
default:
throw new UnknownSwitchCaseException(sourceNode.getType().name());
}
sourceNode.getParent().remove(sourceNode.getName());
}
}
}
public synchronized SeekableByteChannel newByteChannel (EphemeralPath path, Set options, FileAttribute... attrs)
throws IOException {
if (!fileSystem.isOpen()) {
throw new ClosedFileSystemException();
} else if (path.getNameCount() == 0) {
throw new IOException("Cannot open a directory for read operations");
} else {
HeapNode heapNode = findNode(path);
Boolean read = null;
boolean append = false;
boolean truncateExisting = false;
boolean createNew = false;
boolean create = false;
boolean deleteOnClose = false;
for (OpenOption option : options) {
if (!(option instanceof StandardOpenOption)) {
throw new UnsupportedOperationException("Only standard open options are supported");
} else {
if (StandardOpenOption.READ.equals(option)) {
if (Boolean.FALSE.equals(read)) {
throw new IllegalArgumentException("Invalid option combination");
} else {
read = Boolean.TRUE;
}
} else if (StandardOpenOption.WRITE.equals(option) || StandardOpenOption.APPEND.equals(option)) {
if (Boolean.TRUE.equals(read)) {
throw new IllegalArgumentException("Invalid option combination");
} else {
if (StandardOpenOption.APPEND.equals(option)) {
if (truncateExisting) {
throw new IllegalArgumentException("Invalid option combination");
} else {
append = true;
}
}
read = Boolean.FALSE;
}
} else if (StandardOpenOption.TRUNCATE_EXISTING.equals(option)) {
if (append) {
throw new IllegalArgumentException("Invalid option combination");
} else {
truncateExisting = true;
}
} else if (StandardOpenOption.CREATE_NEW.equals(option)) {
createNew = true;
} else if (StandardOpenOption.CREATE.equals(option)) {
create = true;
} else if (StandardOpenOption.DELETE_ON_CLOSE.equals(option)) {
deleteOnClose = true;
}
}
}
for (FileAttribute attribute : attrs) {
if (!"posix:permissions".equals(attribute.name())) {
throw new UnsupportedOperationException("Only posix permission file attributes are supported");
}
}
if (read == null) {
read = Boolean.TRUE;
}
if (Boolean.TRUE.equals(read)) {
if (heapNode == null) {
throw new NoSuchFileException(path.toString());
} else {
switch (heapNode.getType()) {
case FILE:
return new EphemeralSeekableByteChannel(this, (FileNode)heapNode, path, true, false, deleteOnClose);
case DIRECTORY:
throw new IOException("Cannot open a directory for read operations");
default:
throw new UnknownSwitchCaseException(heapNode.getType().name());
}
}
} else {
if (heapNode == null) {
if (!(createNew || create)) {
throw new NoSuchFileException(path.toString());
} else {
EphemeralPath parentPath;
HeapNode parentNode;
if ((parentNode = findNode(parentPath = path.getParent())) == null) {
throw new NoSuchFileException(parentPath.toString());
} else {
switch (parentNode.getType()) {
case FILE:
throw new NoSuchFileException(path.toString());
case DIRECTORY:
FileNode fileNode;
((DirectoryNode)parentNode).put(fileNode = new FileNode((DirectoryNode)parentNode, path.getNames()[path.getNameCount() - 1], blockSize));
return new EphemeralSeekableByteChannel(this, fileNode, path, false, false, deleteOnClose);
default:
throw new UnknownSwitchCaseException(parentNode.getType().name());
}
}
}
} else {
if (createNew) {
throw new FileAlreadyExistsException(path.toString());
} else {
switch (heapNode.getType()) {
case FILE:
if (truncateExisting) {
((FileNode)heapNode).getSegmentBuffer().clear();
}
return new EphemeralSeekableByteChannel(this, (FileNode)heapNode, path, false, append, deleteOnClose);
case DIRECTORY:
throw new IOException("Cannot open a directory for write operations");
default:
throw new UnknownSwitchCaseException(heapNode.getType().name());
}
}
}
}
}
}
private HeapNode findNode (EphemeralPath path)
throws NoSuchFileException {
if (!path.isAbsolute()) {
throw new NoSuchFileException(path.toString());
} else {
DirectoryNode currentNode = rootNode;
for (int index = 0; index < path.getNames().length; index++) {
HeapNode childNode;
if ((childNode = currentNode.get(path.getNames()[index])) == null) {
return null;
} else {
switch (childNode.getType()) {
case FILE:
if (index < path.getNames().length - 1) {
throw new NoSuchFileException(path.toString());
} else {
return childNode;
}
case DIRECTORY:
currentNode = (DirectoryNode)childNode;
break;
default:
throw new UnknownSwitchCaseException(childNode.getType().name());
}
}
}
return currentNode;
}
}
}