/*

 * Copyright (c) 1996, 1998, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code 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.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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 in the LICENSE file that

 * accompanied this code).

 *

 * 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/*-

 * netdoc urls point either into the local filesystem or externally

 * through an http url, with network documents being preferred.  Useful for

 * FAQs & other documents which are likely to be changing over time at the

 * central site, and where the user will want the most recent edition.

 *

 * @author Steven B. Byrne

 */

package sun.net.www.protocol.netdoc;

import java.net.URL;

import java.net.URLConnection;

import java.net.MalformedURLException;

import java.net.URLStreamHandler;

import java.io.InputStream;

import java.io.IOException;

public class Handler extends URLStreamHandler {

    static URL base;

    /*

     * Attempt to find a load the given url using the default (network)

     * documentation location.  If that fails, use the local copy

     */

    public synchronized URLConnection openConnection(URL u)

        throws IOException

    {

        URLConnection uc = null;

        URL ru;

        Boolean tmp = java.security.AccessController.doPrivileged(

            new sun.security.action.GetBooleanAction("newdoc.localonly"));

        boolean localonly = tmp.booleanValue();

        String docurl = java.security.AccessController.doPrivileged(

            new sun.security.action.GetPropertyAction("doc.url"));

        String file = u.getFile();

        if (!localonly) {

            try {

                if (base == null) {

                    base = new URL(docurl);

                }

                ru = new URL(base, file);

            } catch (MalformedURLException e) {

                ru = null;

            }

            if (ru != null) {

                uc = ru.openConnection();

            }

        }

        if (uc == null) {

            try {

                ru = new URL("file", "~", file);

                uc = ru.openConnection();

                InputStream is = uc.getInputStream();   // Check for success.

            } catch (MalformedURLException e) {

                uc = null;

            } catch (IOException e) {

                uc = null;

            }

        }

        if (uc == null) {

            throw new IOException("Can't find file for URL: "

                                  +u.toExternalForm());

        }

        return uc;

    }

}