fileurlmapper.java

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/*
 * @(#)FileURLMapper.java	1.2 03/01/23
 *
 * Copyright  1990-2008 Sun Microsystems, Inc. All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version
 * 2 only, as published by the Free Software Foundation. 
 * 
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License version 2 for more details (a copy is
 * included at /legal/license.txt). 
 * 
 * You should have received a copy of the GNU General Public License
 * version 2 along with this work; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA 
 * 
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
 * Clara, CA 95054 or visit www.sun.com if you need additional
 * information or have any questions. 
 */

package sun.misc;

import java.net.URL;
import java.io.File;
import sun.net.www.ParseUtil;

/**
 * (Solaris) platform specific handling for file: URLs . 
 * urls must not contain a hostname in the authority field
 * other than "localhost". 
 *
 * This implementation could be updated to map such URLs
 * on to /net/host/...
 *
 * @version 	1.2, 03/01/23
 */

public class FileURLMapper {

    URL url;
    String path;

    public FileURLMapper (URL url) {
	this.url = url;
    }

    /**
     * @returns the platform specific path corresponding to the URL
     *  so long as the URL does not contain a hostname in the authority field.
     */

    public String getPath () {
	if (path != null) {
	    return path;
	}
	String host = url.getHost();
	if (host == null || "".equals(host) || "localhost".equals (host)) {
	    path = url.getFile();
	    path = ParseUtil.decode (path);
	} 
	return path;
    }

    /**
     * Checks whether the file identified by the URL exists.
     */
    public boolean exists () {
	String s = getPath ();
	if (s == null) {
	    return false;
	} else {
	    File f = new File (s);
	    return f.exists();
	}
    }
}