1998-09-09 04:52:38 +04:00
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/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil -*-
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*
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1999-11-02 04:51:54 +03:00
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* The contents of this file are subject to the Mozilla Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/MPL/
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1998-09-09 04:52:38 +04:00
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*
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1999-11-02 04:51:54 +03:00
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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1998-09-09 04:52:38 +04:00
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*
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* The Original Code is the Grendel mail/news client.
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*
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* The Initial Developer of the Original Code is Netscape Communications
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1999-11-02 04:51:54 +03:00
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* Corporation. Portions created by Netscape are
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* Copyright (C) 1997 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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1998-09-09 04:52:38 +04:00
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*
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* Created: Frank Tang <ftang@netscape.com>
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*/
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package calypso.util;
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import java.util.Enumeration;
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import java.io.File;
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import java.lang.String;
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import java.util.zip.ZipFile;
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import java.util.zip.ZipEntry;
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import java.util.StringTokenizer;
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import java.util.Hashtable;
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/*
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*
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* @author ftang
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1999-11-02 04:51:54 +03:00
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* @version $Revision: 1.2 $
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1998-09-09 04:52:38 +04:00
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* @see
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*
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*/
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abstract class FilterEnumeration extends PrefetchEnumeration {
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private Enumeration fDelegate;
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public FilterEnumeration( Enumeration en)
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{
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fDelegate = en;
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}
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abstract protected boolean verify(Object obj);
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protected Object fetch()
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{
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if(fDelegate.hasMoreElements()) {
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Object candidcate;
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for( candidcate = fDelegate.nextElement();
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fDelegate.hasMoreElements();
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candidcate = fDelegate.nextElement())
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{
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if(this.verify(candidcate))
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return candidcate;
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}
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}
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return null;
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}
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}
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class ZipFileEnumeration implements Enumeration {
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class StringStartEndFilterEnumeration extends FilterEnumeration {
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private String fStart;
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private String fEnd;
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public StringStartEndFilterEnumeration(
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Enumeration en,
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String start,
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String end
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)
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{
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super(en);
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fStart = start;
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fEnd = end;
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}
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protected boolean verify(Object obj)
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{
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String str = (String)((ZipEntry) obj).getName();
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return str.startsWith(fStart) && str.endsWith(fEnd);
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}
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}
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private Enumeration fDelegate;
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private String fPrefix;
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private String fPostfix;
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public ZipFileEnumeration (
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File zip ,String pkg, String prefix, String postfix)
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{
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fPrefix = pkg.replace('.', '/') + '/' + prefix;
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fPostfix = postfix;
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try {
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ZipFile zf = new ZipFile(zip);
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fDelegate = new
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StringStartEndFilterEnumeration(
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zf.entries(),
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fPrefix,
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fPostfix
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);
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}
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catch (Exception e)
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{
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System.out.println(e); // For Debug only
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fDelegate = null;
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}
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}
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public boolean hasMoreElements()
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{
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return ((fDelegate != null) &&
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fDelegate.hasMoreElements());
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}
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public Object nextElement()
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{
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if(fDelegate == null)
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return null;
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String current = (String)((ZipEntry) fDelegate.nextElement()).getName();
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return current.substring(
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fPrefix.length(),
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(current.length() - fPostfix.length()));
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}
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}
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class DirectoryEnumeration extends PrefetchEnumeration {
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private String fList[] = null;
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private String fPrefix;
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private String fPostfix;
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private int fIdx = 0;
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public DirectoryEnumeration (
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File dir ,String pkg, String prefix, String postfix)
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{
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fPrefix = prefix;
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fPostfix = postfix;
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File realdir = new File(dir, pkg.replace('.',File.separatorChar));
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if(realdir.exists() && realdir.isDirectory() && realdir.canRead())
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{
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fList = realdir.list();
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fIdx = -1;
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}
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}
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protected Object fetch()
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{
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if(fList != null)
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{
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for(fIdx++ ; fIdx < fList.length; fIdx++)
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{
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if( fList[fIdx].startsWith( fPrefix ) &&
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fList[fIdx].endsWith( fPostfix ) )
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{
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return fList[fIdx].substring(
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fPrefix.length(),
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(fList[fIdx].length() - fPostfix.length()));
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}
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}
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}
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return null;
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}
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}
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public class ClasspathEntryEnumeration extends PrefetchEnumeration {
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private String fPkg;
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private String fPrefix;
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private String fPostfix;
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private Enumeration fEntryEnumeration;
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private Enumeration fPathEnumeration;
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private Hashtable cache;
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/*
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* @author ftang
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1999-11-02 04:51:54 +03:00
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* @version $Revision: 1.2 $
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1998-09-09 04:52:38 +04:00
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* @see
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*
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*/
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public ClasspathEntryEnumeration( String pkg, String prefix, String postfix)
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{
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fPrefix = prefix;
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fPostfix = postfix;
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fPkg = pkg;
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fFetch = null;
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cache = new Hashtable(20);
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fPathEnumeration = new StringTokenizer(
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System.getProperty("java.class.path"),
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File.pathSeparator);
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fEntryEnumeration = null;
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}
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/*
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*
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* @author ftang
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1999-11-02 04:51:54 +03:00
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* @version $Revision: 1.2 $
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1998-09-09 04:52:38 +04:00
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* @see
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*
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*/
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protected Object fetch()
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{
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if((fEntryEnumeration != null) &&
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fEntryEnumeration.hasMoreElements())
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{
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Object candidcate = fEntryEnumeration.nextElement();
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if(cache.get(candidcate) != null)
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return fetch(); // have been report once, try next
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cache.put(candidcate, candidcate);
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return candidcate;
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}
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if(fPathEnumeration.hasMoreElements())
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{
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String newPathEntry = (String) fPathEnumeration.nextElement();
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File newPathBase = new File(newPathEntry);
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if(newPathBase.exists() && newPathBase.canRead())
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{
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if(newPathBase.isDirectory())
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{
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fEntryEnumeration =
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new DirectoryEnumeration (
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newPathBase, fPkg, fPrefix, fPostfix);
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}
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else
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{
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fEntryEnumeration =
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new ZipFileEnumeration (
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newPathBase, fPkg, fPrefix, fPostfix);
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}
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}
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return fetch();
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}
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return null;
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}
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}
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