Quadcap Embeddable Database

com/quadcap/io/dir/FileDirectory.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.FileFilter;
import java.io.IOException;

import java.util.Enumeration;
import java.util.Vector;

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

/**
 * 
 *
 * @author Stan Bailes
 */
public class FileDirectory extends Directory {
    URL                         base;
    File                        root;
    Vector                      entries = null;
    
    public FileDirectory(File root) throws IOException {
        this.root = root;
        this.base = new URL("file", "", root.getCanonicalPath());
    }

    final void getEntries() {
        entries = new Vector();
        root.listFiles(makeFilter(null));
    }

    FileFilter makeFilter(final String path) {
        return new FileFilter() {
            public boolean accept(File f) {
                StringBuffer sb = new StringBuffer();
                if (path != null) {
                    sb.append(path);
                    sb.append('/');
                }
                sb.append(f.getName());
                if (f.isDirectory()) {
                    f.listFiles(makeFilter(sb.toString()));
                } else {
                    entries.addElement(sb.toString());
                }
                return false;
            }
        };
    }
        
    public Enumeration entries() {
        getEntries();
        return entries.elements();
    }

    public Entry getEntry(String name) {
        FileEntry fe = null;
        if (name.length() > 0 && name.charAt(0) == '/') {
            name = name.substring(1);
        }
        File f = new File(root, name);
        if (f.exists()) {
            fe = new FileEntry(f, name);
        }
        return fe;
    }

    public URL getURL(String name) throws MalformedURLException {
        URL url = null;
        if (name.length() > 0 && name.charAt(0) == '/') {
            name = name.substring(1);
        }
        File f = new File(root, name);
        if (f.exists()) {
            try {
                url = new URL("file", "", f.getCanonicalPath());
            } catch (IOException e) {
                throw new MalformedURLException(e.toString());
            }
        }
        return url;
    }

    public static String safePath(String path) {
        String opath = path;
        int state = -1;
        int last = -1;
        int prev = -1;
        for (int i = 0; i < path.length(); i++) {
            if (state == 0) {
                prev = last;
                last = i;
            }
            if (state == -1) state = 0;
            char c = path.charAt(i);
            if (c == '\\') c = '/';
            switch (state) {
            case 0:
                if (c == '.') state = 10;
                else if (c == '/') state = 0;
                else state = 1;
                break;
            case 1:
                if (c == '/') state = 0;
                break;
            case 10:
                if (c == '.') state = 11;
                else if (c == '/') state = 0;
                else state = 1;
                break;
            case 11:
                if (c == '/') {
                    if (prev < 0) return null;
                    int cut = i - prev + 1;
                    path = path.substring(0, prev) + path.substring(i+1);
                    i += cut;
                    state = 0;
                    last = prev;
                    prev = -1;
                } else {
                    state = 1;
                }
                break;
            }
        }
        return path;
    }
                
    public String getRealPath(String name) {
        String ret = null;
        String path = safePath(name);
        if (path != null) {
            File f = new File(root, path);
            ret = f.getAbsolutePath();
        }
        return ret;
    }

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

    public void close() {}

    public boolean isFile() { return true; }
}