// TODO: Make ln fit the 30 line
public void ln(String firstPath, String secondPath) throws Exception {
// Initialize the variables.
JShellItem targetItem;
JShellItem aliasItem;
String newName;
Directory destinationDirectory;
// Find and reference the target item. Throw Exception if the path
// doesn't exist.
targetItem = getItemAtPath(firstPath, 0);
if (targetItem == null) {
throw new Exception(firstPath + ": doesn't exist.");
}
// Find and reference the destination Directory.
if (secondPath.endsWith("/")) {
destinationDirectory = (Directory) getItemAtPath(secondPath, 0);
newName = targetItem.getName();
} else {
destinationDirectory = (Directory) getItemAtPath(secondPath, 1);
newName = secondPath.substring(secondPath.lastIndexOf("/") + 1);
}
// If the Directory destination is not found.
if (destinationDirectory == null) {
throw new Exception(secondPath + " is an invalid destination path.");
}
// Throw Exception when there is a JShellItem that already exist within
// the destination Directory.
if (destinationDirectory.contains(newName)) {
throw new Exception(secondPath + ": already exists.");
}
// If the target item is a Directory object.
if (targetItem instanceof Directory)
// Create a new Directory object that will references it's contents
// from the target item.
aliasItem =
new DirectoryAlias(
newName,
destinationDirectory.getPath() + newName + "/",
destinationDirectory,
(Directory) targetItem);
// If the target item is a File object.
else
// Create a new FileAlias object that will reference it's contents
// from the target item.
aliasItem =
new FileAlias(
newName,
destinationDirectory.getPath() + newName,
destinationDirectory,
(File) targetItem);
// Add the alias object to the destination Directory.
destinationDirectory.addItem(aliasItem);
}
/**
* Print the path of the files specified by the paths argument whose path contains regex.
*
* @param regex is a String regular expression
* @param paths is a List of paths
*/
public String find(String regex, List<String> paths) throws Exception {
String results = "";
regex = regex.replace("?", ".?").replace("*", ".*?");
Pattern regexPattern = Pattern.compile(regex);
Matcher regexMatcher;
// If the user input was empty, call find on the current directory.
if (paths.isEmpty()) {
paths.add(currentDirectory_.getPath());
}
// Loop through the paths.
for (String path : paths) {
List<String> recursiveListing = recurseOnPath(path, true);
// Loop through the list of JShellItems found recursively.
for (String name : recursiveListing) {
regexMatcher = regexPattern.matcher(name);
// Append to results if match is found.
if (regexMatcher.find()) {
results = results + name + "\n";
}
}
}
if (results.endsWith("\n")) {
results = results.substring(0, results.length() - 1);
} else {
results = "find: no such file or directory.";
}
// Return the completed output.
return results;
}
/**
* Copy file or directory oldFile to newFile;
*
* @param oldFile a full path to a JShellItem or the name of a JShellItem in the current directory
* which needs to be copied.
* @param newFile a full path to a directory or the name of a directory in the current directory
* to which oldFile needs to be copied.
*/
public void cp(String oldPath, String newPath) throws Exception {
Directory destinationParent;
String newName;
if (oldPath.equals(newPath)) {
return;
}
JShellItem oldItem = getItemAtPath(oldPath, 0);
if (oldItem == null) {
throw new Exception(oldItem + " does not exist.");
}
if (newPath.endsWith("/")) {
destinationParent = (Directory) getItemAtPath(newPath, 0);
newName = oldItem.getName();
} else {
destinationParent = (Directory) getItemAtPath(newPath, 1);
newName = newPath.substring(newPath.lastIndexOf("/") + 1);
}
if (destinationParent == null) {
throw new Exception(newPath + " is an invalid destination path.");
}
if (destinationParent.contains(newName)) {
throw new Exception(destinationParent.getPath() + newName + " already exists.");
}
if (oldItem instanceof File) {
File newItem =
new File(
newName,
destinationParent.getPath() + "/" + newName,
destinationParent,
((File) oldItem).getContent());
destinationParent.addItem(newItem);
} else {
if (destinationParent.isChildOf((Directory) oldItem)) {
throw new Exception(
String.format("cp: cannot copy '%s' into itself, '%s'", oldPath, newPath));
}
Directory newItem =
new Directory(newName, destinationParent.getPath() + newName + "/", destinationParent);
destinationParent.addItem(newItem);
for (JShellItem item : ((Directory) oldItem).getContents().values()) {
cp(item.getPath(), newItem.getPath());
}
}
}
/**
* Creates Directories in the paths provided. The path is considered to be invalid if (1) There is
* already an item with the same path. (2) The immediate parent of the specified path does not
* exist.
*
* @throws Exception if a provided path is invalid.
* @param paths is the list of paths. Paths can be relative to the current directory or the full
* path.
*/
public void mkdir(List<String> paths) throws Exception {
for (String dir : paths) {
if (!dir.startsWith("/")) {
dir = currentDirectory_.getPath().concat(dir);
}
while (dir.endsWith("/")) {
dir = dir.substring(0, dir.length() - 1);
}
String[] dirs = dir.split("/");
String dirName = dirs[dirs.length - 1];
dir = dir.substring(0, dir.length() - dirName.length());
Directory parent = (Directory) getItemAtPath(dir, 0);
if (parent == null) {
throw new NullPointerException("The path specified is " + "incorrect.");
}
if (parent.getContents().keySet().contains(dirName)) {
throw new Exception("A directory already exists at that " + "path.");
}
parent.addItem(new Directory(dirName, parent.getPath() + dirName + "/", parent));
}
}
/**
* Return the names of the contained items, if path leads to a Directory. Or, return the path
* provided, if it leads to a File.
*
* @param paths a list of Strings containing the desired paths.
* @return a String containing the relevant contents.
*/
public String ls(List<String> paths) throws Exception {
// If ls is called without parameters.
if (paths.isEmpty()) {
if (!currentOptions_.equals("R")) {
if (currentDirectory_.getSize() == 0) {
return "";
} else {
return currentDirectory_.ls().substring(2);
}
}
paths.add(currentDirectory_.getPath());
return ls(paths);
// If ls is called with paramters.
} else {
String lsOutput = "";
for (int i = 0; i < paths.size(); i++) {
JShellItem target = getItemAtPath(paths.get(i), 0);
if (!lsOutput.isEmpty()) {
lsOutput += "\n";
}
lsOutput += paths.get(i);
if (target == null) {
lsOutput += ": No such file or directory";
} else {
if (target instanceof Directory
&& currentOptions_.equals("R")
&& ((Directory) target).getNumDirectories() > 0
&& !(target instanceof DirectoryAlias)) {
List<String> recursivePath = recurseOnPath(paths.get(i), false);
Collections.reverse(recursivePath);
lsOutput += target.ls();
lsOutput += "\n";
lsOutput += ls(recursivePath.subList(1, recursivePath.size()));
} else {
// list paths separately
lsOutput += target.ls();
// if there are more paths, print a blank line
if (i < paths.size() - 1) {
lsOutput += "\n";
}
// notify user if there is an error in the path
// specified
}
}
}
return lsOutput;
}
}
/**
* Creates a file at the path passed in the parameter.
*
* @param path The path at which the file is to be created. The path has to contain the file name
* as well.
*/
public void mkfile(String path) throws Exception {
Directory target = currentDirectory_;
if (path.startsWith("/")) {
String targetPath = path.substring(0, path.lastIndexOf("/"));
target = (Directory) getItemAtPath(targetPath, 0);
}
if (target != null) {
String fileName = path.substring(path.lastIndexOf("/") + 1);
if (path.indexOf("/") != -1) {
target = (Directory) getItemAtPath(path.substring(0, path.lastIndexOf("/")), 0);
}
target.addItem(new File(fileName, target.getPath() + fileName, target));
}
}
/**
* Changes current working directory to dir.
*
* @param dir name of a directory in the current directory or may be a full path; '..' means a
* parent directory and '.' means the current directory; The directory separator must be '/',
* the forward slash.
*/
public void cd(String dir) throws Exception {
// Initialize the destination directory.
JShellItem destination;
String path = dir;
// If user's input path doesn't begin with "/", use relative path
// with the current directory.
if (!dir.startsWith("/")) {
dir = currentDirectory_.getPath().concat(dir);
}
// If user's input path doesn't end with "/", concatenate it to
// complete a full path.
if (!dir.endsWith("/")) {
dir = dir.concat("/");
}
// Find the directory location.
destination = getItemAtPath(dir, 0);
// Check to see if user is trying to change directory into a File
// object.
if (destination instanceof File) {
System.out.println(path + ": Not a directory.");
// destination is a Directory Object.
} else {
// Use try to catch NullPointerException for directories that
// doesn't exist.
// If path exists, location of the directory is found.
if (destination != null) {
currentDirectory_ = (Directory) destination;
} else {
// The directory doesn't exist.
throw new NullPointerException(path + ": no such directory.");
}
}
}
/**
* Move file or directory oldFile to newFile;
*
* @param oldFile a full path to a JShellItem or the name of a JShellItem in the current directory
* which needs to be moved.
* @param newFile a full path to a directory or the name of a directory in the current directory
* to which oldFile needs to be moved.
*/
public void mv(String oldFile, String newFile) throws Exception {
JShellItem source = getItemAtPath(oldFile, 0);
if (source == null) {
throw new Exception(oldFile + ": doesn't exist.");
}
Directory sourceParent = source.getParentDirectory();
Directory destinationParent;
String newName;
if (newFile.endsWith("/")) {
destinationParent = (Directory) getItemAtPath(newFile, 0);
newName = source.getName();
} else {
destinationParent = (Directory) getItemAtPath(newFile, 1);
newName = newFile.substring(newFile.lastIndexOf("/") + 1);
}
if (destinationParent == null) {
throw new Exception(newFile + ": invalid destination path.");
}
if (destinationParent.contains(newName)) {
throw new Exception(newFile + ": already exists.");
}
sourceParent.removeItem(source);
source.setName(newName);
if (source instanceof Directory) {
if (destinationParent.isChildOf((Directory) source)) {
throw new Exception(
String.format(
"mv: cannot move '%s' to a subdirectory of itself, '%s'", oldFile, newFile));
}
newName.concat("/");
}
source.setPath(destinationParent.getPath() + newName);
source.setParentDirectory(destinationParent);
destinationParent.addItem(source);
}
/** Prints the prompt in the path + # format. */
public void printPrompt() {
System.out.print(currentDirectory_.getPath() + "# ");
}
/**
* Return the current working directory as a full path.
*
* @return the String representation of current working directory's full path.
*/
public String pwd() {
// Return the current working directory.
return currentDirectory_.getPath();
}