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/* NSC -- new Scala compiler
* Copyright 2005-2006 LAMP/EPFL
* @author Martin Odersky
*/
// $Id$
package scala.tools.nsc.io
import java.io.{File, IOException, InputStream}
import java.util.Enumeration
import java.util.zip.{ZipEntry, ZipFile}
import scala.collection.mutable.{Map, HashMap}
/**
* @author Philippe Altherr
* @version 1.0, 23/03/2004
*/
object ZipArchive {
//########################################################################
/**
* ...
*
* @param path ...
* @return ...
*/
def fromPath(path: String): AbstractFile = fromFile(new File(path))
/**
* If the specified file <code>file</code> exists and is a readable
* zip archive, returns an abstract file backed by it. Otherwise,
* returns <code>null</code>.
*
* @param file ...
* @return ...
*/
def fromFile(file: File): AbstractFile =
try { new ZipArchive(file, new ZipFile(file)) }
catch { case _: IOException => null }
/**
* Returns an abstract directory backed by the specified archive.
*
* @param archive ...
* @return ...
*/
def fromArchive(archive: ZipFile): AbstractFile =
new ZipArchive(new File(archive.getName()), archive);
}
/**
* This class implements an abstract directory backed by a zip
* archive. We let the encoding be null, because we behave like
* a directory
*/
final class ZipArchive(file: File, val archive: ZipFile) extends PlainFile(file) {
assert(archive ne null)
//########################################################################
// Private Fields
/** The root directory or null if not yet initialized */
private var root: DirEntry = _
//########################################################################
// Public Methods
/** Returns true. */
override def isDirectory = true
/** Returns all abstract subfiles of this abstract directory. */
override def elements: Iterator[AbstractFile] = {
if (root eq null) load()
root.elements
}
/**
* Returns the abstract file in this abstract directory with the
* specified name. If there is no such file, returns null. The
* argument "directory" tells whether to look for a directory or
* or a regular file.
*/
override def lookupName(name: String, directory: Boolean): AbstractFile = {
if (root eq null) load()
root.lookupName(name, directory)
}
//########################################################################
// Private Methods
/** Loads the archive and creates the root directory. */
private def load(): Unit = {
this.root = new DirEntry("<root>", "/")
// A path to DirEntry map
val dirs: Map[String,DirEntry] = new HashMap()
dirs.update("/", root)
val entries = archive.entries()
while (entries.hasMoreElements()) {
val entry = entries.nextElement().asInstanceOf[ZipEntry]
val path = entry.getName()
assert(entry.isDirectory() == path.endsWith("/"),
this.toString() + " - " + path);
if (entry.isDirectory()) {
val dir: DirEntry = getDir(dirs, path)
assert(dir.entry eq null, this.toString() + " - " + path)
dir.entry = entry
} else {
val index = path.lastIndexOf('/')
val name = if (index < 0) path else path.substring(index + 1)
val home = if (index < 0) "/" else path.substring(0, index + 1)
val parent: DirEntry = getDir(dirs, home)
assert(!parent.entries.contains(path), this.toString() + " - " + path)
parent.entries.update(name, new FileEntry(name, path, entry))
}
}
}
/**
* Lookups the specified table for a DirEntry with the specified
* path. If successful, returns the found DirEntry. Otherwise
* creates a new DirEntry, enters it into the table and in the
* table of its parent ZipDir and returns it.
*/
private def getDir(dirs: Map[String,DirEntry], path: String): DirEntry =
dirs.get(path) match {
case Some(dir) => dir
case None => {
val index = path.lastIndexOf('/', path.length() - 2);
val name = if (index < 0) path else path.substring(index + 1);
val home = if (index < 0) "/" else path.substring(0, index + 1);
val parent: DirEntry = getDir(dirs, home);
val dir = new DirEntry(name.substring(0, name.length() - 1), path);
parent.entries.update(name, dir);
dirs.update(path, dir);
dir
}
}
//########################################################################
// Private Class - Entry
/** Superclass of archive entries */
abstract class Entry(name: String, path: String)
extends VirtualFile(name, path) {
final override def path = ZipArchive.this.toString() + "(" + super.path + ")"
final def getArchive = ZipArchive.this.archive
}
//########################################################################
// Private Class - DirEntry
/** A directory archive entry */
private final class DirEntry(name: String, path: String)
extends Entry(name, path)
{
val entries: Map[String,Entry] = new HashMap()
var entry: ZipEntry = _
override def isDirectory = true
override def read = throw new Error("cannot read directories");
override def lastModified: Long =
if (entry ne null) entry.getTime() else super.lastModified
override def elements: Iterator[AbstractFile] = entries.values
override def lookupName(name: String, directory: Boolean): AbstractFile =
entries.get(if (directory) name + "/" else name) match {
case Some(dir) => dir
case None => null
}
}
//########################################################################
// Private Class - FileEntry
/** A regular file archive entry */
final class FileEntry(name: String, path: String, val entry: ZipEntry)
extends Entry(name, path) {
def archive = ZipArchive.this.archive;
override def lastModified: Long = entry.getTime()
override def read = archive.getInputStream(entry);
override def size = Some(entry.getSize().toInt)
}
}
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