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|
/* ____ ____ ____ ____ ______ *\
** / __// __ \/ __// __ \/ ____/ SOcos COmpiles Scala **
** __\_ \/ /_/ / /__/ /_/ /\_ \ (c) 2002, LAMP/EPFL **
** /_____/\____/\___/\____/____/ **
\* */
// $Id$
package scala.tools.util;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Iterator;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
/**
* This class implements an abstract directory backed by a zip
* archive.
*/
public final class ZipArchive extends PlainFile {
//########################################################################
// Public Factories
/** Returns "fromFile(new File(path))". */
public static AbstractFile fromPath(String path) {
return fromFile(new File(path));
}
/**
* If the specified File exists and is a readable zip archive,
* returns an abstract file backed by it. Otherwise, returns null.
*/
public static AbstractFile fromFile(File file) {
try {
return new ZipArchive(file, new ZipFile(file));
} catch (IOException exception) {
return null;
}
}
/**
* Returns an abstract directory backed by the specified archive.
*/
public static AbstractFile fromArchive(ZipFile archive) {
return new ZipArchive(new File(archive.getName()), archive);
}
//########################################################################
// Private Fields
/** The zip archive */
private final ZipFile archive;
/** The root directory or null if not yet initialized */
private DirEntry root;
//########################################################################
// Protected Constructors
/**
* Initializes this instance with the specified File and ZipFile.
*/
protected ZipArchive(File file, ZipFile archive) {
super(file);
this.archive = archive;
assert archive != null;
}
//########################################################################
// Public Methods
/** Returns true. */
public boolean isDirectory() {
return true;
}
/** Returns all abstract subfiles of this abstract directory. */
public Iterator/*<AbstractFile>*/ list() {
if (root == null) load();
return root.list();
}
/**
* 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.
*/
public AbstractFile lookupName(String name, boolean directory) {
if (root == null) load();
return root.lookupName(name, directory);
}
//########################################################################
// Private Methods
/** Loads the archive and creates the root directory. */
private void load() {
this.root = new DirEntry("<root>", "/");
// A path to DirEntry map
HashMap/*<String,DirEntry>*/ dirs = new HashMap();
dirs.put("/", root);
for (Enumeration e = archive.entries(); e.hasMoreElements(); ) {
ZipEntry entry = (ZipEntry)e.nextElement();
String path = entry.getName();
assert entry.isDirectory() == path.endsWith("/"): this +"-"+ path;
if (entry.isDirectory()) {
DirEntry dir = getDir(dirs, path);
assert dir.entry == null: this + " - " + path;
dir.entry = entry;
} else {
int index = path.lastIndexOf('/');
String name = index < 0 ? path : path.substring(index + 1);
String home = index < 0 ? "/" : path.substring(0, index + 1);
DirEntry parent = getDir(dirs, home);
assert !parent.entries.containsKey(path): this + " - " + path;
parent.entries.put(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 DirEntry getDir(HashMap/*<String,DirEntry>*/ dirs, String path) {
DirEntry dir = (DirEntry)dirs.get(path);
if (dir == null) {
int index = path.lastIndexOf('/', path.length() - 2);
String name = index < 0 ? path : path.substring(index + 1);
String home = index < 0 ? "/" : path.substring(0, index + 1);
DirEntry parent = getDir(dirs, home);
dir = new DirEntry(name.substring(0, name.length() - 1), path);
parent.entries.put(name, dir);
dirs.put(path, dir);
}
return dir;
}
//########################################################################
// Private Class - Entry
/** Superclass of archive entries */
private abstract class Entry extends VirtualFile {
public Entry(String name, String path) {
super(name, path);
}
public final String getPath() {
return ZipArchive.this + "(" + super.getPath() + ")";
}
}
//########################################################################
// Private Class - DirEntry
/** A directory archive entry */
private final class DirEntry extends Entry {
public final HashMap/*<String,Entry>*/ entries;
public ZipEntry entry;
public DirEntry(String name, String path) {
super(name, path);
this.entries = new HashMap();
}
public boolean isDirectory() {
return true;
}
public long lastModified() {
return entry != null ? entry.getTime() : super.lastModified();
}
public Iterator/*<AbstractFile>*/ list() {
return entries.values().iterator();
}
public AbstractFile lookupName(String name, boolean directory) {
return (AbstractFile)entries.get(directory ? name + "/" : name);
}
}
//########################################################################
// Private Class - FileEntry
/** A regular file archive entry */
public final class FileEntry extends Entry {
public final ZipEntry entry;
public FileEntry(String name, String path, ZipEntry entry) {
super(name, path);
this.entry = entry;
}
public long lastModified() {
return entry.getTime();
}
public byte[] read() throws IOException {
InputStream in = archive.getInputStream(entry);
int rest = (int)entry.getSize();
byte[] buf = new byte[rest];
do {
int res = in.read(buf, buf.length - rest, rest);
if (res == -1)
throw new IOException("read error");
rest -= res;
} while (rest > 0);
in.close();
return buf;
}
}
//########################################################################
}
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