Quadcap Embeddable Database

com/quadcap/io/dir/JarDirectory.java

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package com.quadcap.io.dir;

/* Copyright 2000 - 2003 Quadcap Software.  All rights reserved.
 *
 * This software is distributed under the Quadcap Free Software License.
 * This software may be used or modified for any purpose, personal or
 * commercial.  Open Source redistributions are permitted.  Commercial
 * redistribution of larger works derived from, or works which bundle
 * this software requires a "Commercial Redistribution License"; see
 * http://www.quadcap.com/purchase.
 *
 * Redistributions qualify as "Open Source" under  one of the following terms:
 *   
 *    Redistributions are made at no charge beyond the reasonable cost of
 *    materials and delivery.
 *
 *    Redistributions are accompanied by a copy of the Source Code or by an
 *    irrevocable offer to provide a copy of the Source Code for up to three
 *    years at the cost of materials and delivery.  Such redistributions
 *    must allow further use, modification, and redistribution of the Source
 *    Code under substantially the same terms as this license.
 *
 * Redistributions of source code must retain the copyright notices as they
 * appear in each source code file, these license terms, and the
 * disclaimer/limitation of liability set forth as paragraph 6 below.
 *
 * Redistributions in binary form must reproduce this Copyright Notice,
 * these license terms, and the disclaimer/limitation of liability set
 * forth as paragraph 6 below, in the documentation and/or other materials
 * provided with the distribution.
 *
 * The Software is provided on an "AS IS" basis.  No warranty is
 * provided that the Software is free of defects, or fit for a
 * particular purpose.  
 *
 * Limitation of Liability. Quadcap Software shall not be liable
 * for any damages suffered by the Licensee or any third party resulting
 * from use of the Software.
 */

import java.io.File;
import java.io.IOException;

import java.util.Enumeration;

import java.util.jar.JarFile;

import java.net.MalformedURLException;
import java.net.URL;

/**
 * 
 *
 * @author Stan Bailes
 */

public class JarDirectory extends Directory {
    URL                         base;
    JarFile                     jar;
    File                        file;

    public JarDirectory(File f) throws IOException {
        this.file = f;  
        this.jar = new JarFile(f);
        this.base = new URL("jar:file:" + f.getAbsolutePath() + "!/");
    }
    
    public Enumeration entries() {
        final JarDirectory dir = this;
        final Enumeration je = jar.entries();
        return new Enumeration() {
            public boolean hasMoreElements() {
                return je.hasMoreElements();
            }
            public Object nextElement() {
                java.util.jar.JarEntry j = (java.util.jar.JarEntry)je.nextElement();
                return j.getName();
            }
        };
    }

    public Entry getEntry(String name) {
        java.util.jar.JarEntry j = jar.getJarEntry(name);
        if (j != null) {
            return new JarEntry(this, j);
        } else {
            return null;
        }
    }

    public URL getURL(String name) throws MalformedURLException {
        URL url = null;
        if (name.charAt(0) == '/') name = name.substring(1);
        java.util.jar.JarEntry j = jar.getJarEntry(name);
        if (j != null) {
            url = new URL(base, name);
        }
        return url;
    }

    public String getRealPath(String name) {
        return null;
    }

    public String getRootPath() {
        return file.getAbsolutePath();
    }

    public void close() throws IOException {
        jar.close();
    }

    public boolean isFile() { return false; }
}