001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.commons.vfs2.provider;
018
019import java.io.IOException;
020import java.net.URL;
021import java.net.URLConnection;
022import java.net.URLStreamHandler;
023
024import org.apache.commons.vfs2.FileObject;
025import org.apache.commons.vfs2.FileSystemException;
026import org.apache.commons.vfs2.FileSystemOptions;
027
028/**
029 * A default URL stream handler that will work for most file systems.
030 */
031public class DefaultURLStreamHandler extends URLStreamHandler {
032    private final VfsComponentContext context;
033    private final FileSystemOptions fileSystemOptions;
034
035    public DefaultURLStreamHandler(final VfsComponentContext context) {
036        this(context, null);
037    }
038
039    public DefaultURLStreamHandler(final VfsComponentContext context, final FileSystemOptions fileSystemOptions) {
040        this.context = context;
041        this.fileSystemOptions = fileSystemOptions;
042    }
043
044    @Override
045    protected URLConnection openConnection(final URL url) throws IOException {
046        final FileObject entry = context.resolveFile(url.toExternalForm(), fileSystemOptions);
047        return new DefaultURLConnection(url, entry.getContent());
048    }
049
050    @Override
051    protected void parseURL(final URL u, final String spec, final int start, final int limit) {
052        try {
053            final FileObject old = context.resolveFile(u.toExternalForm(), fileSystemOptions);
054
055            FileObject newURL;
056            if (start > 0 && spec.charAt(start - 1) == ':') {
057                newURL = context.resolveFile(old, spec, fileSystemOptions);
058            } else {
059                if (old.isFile() && old.getParent() != null) {
060                    // for files we have to resolve relative
061                    newURL = old.getParent().resolveFile(spec);
062                } else {
063                    newURL = old.resolveFile(spec);
064                }
065            }
066
067            final String url = newURL.getName().getURI();
068            final StringBuilder filePart = new StringBuilder();
069            final String protocolPart = UriParser.extractScheme(url, filePart);
070
071            setURL(u, protocolPart, "", -1, null, null, filePart.toString(), null, null);
072        } catch (final FileSystemException fse) {
073            // This is rethrown to MalformedURLException in URL anyway
074            throw new RuntimeException(fse.getMessage());
075        }
076    }
077
078    @Override
079    protected String toExternalForm(final URL u) {
080        return u.getProtocol() + ":" + u.getFile();
081    }
082}