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Apache Commons VFS is a Virtual File System library.
There is a newer version: 2.9.0
/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.commons.vfs2.provider;

import java.io.IOException;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLStreamHandler;

import org.apache.commons.vfs2.FileObject;
import org.apache.commons.vfs2.FileSystemException;
import org.apache.commons.vfs2.FileSystemOptions;

/**
 * A default URL stream handler that will work for most file systems.
 */
public class DefaultURLStreamHandler extends URLStreamHandler {
    private final VfsComponentContext context;
    private final FileSystemOptions fileSystemOptions;

    public DefaultURLStreamHandler(final VfsComponentContext context) {
        this(context, null);
    }

    public DefaultURLStreamHandler(final VfsComponentContext context, final FileSystemOptions fileSystemOptions) {
        this.context = context;
        this.fileSystemOptions = fileSystemOptions;
    }

    @Override
    protected URLConnection openConnection(final URL url) throws IOException {
        final FileObject entry = context.resolveFile(url.toExternalForm(), fileSystemOptions);
        return new DefaultURLConnection(url, entry.getContent());
    }

    @Override
    protected void parseURL(final URL u, final String spec, final int start, final int limit) {
        try {
            final FileObject old = context.resolveFile(u.toExternalForm(), fileSystemOptions);

            FileObject newURL;
            if (start > 0 && spec.charAt(start - 1) == ':') {
                newURL = context.resolveFile(old, spec, fileSystemOptions);
            } else {
                if (old.isFile() && old.getParent() != null) {
                    // for files we have to resolve relative
                    newURL = old.getParent().resolveFile(spec);
                } else {
                    newURL = old.resolveFile(spec);
                }
            }

            final String url = newURL.getName().getURI();
            final StringBuilder filePart = new StringBuilder();
            final String protocolPart = UriParser.extractScheme(url, filePart);

            setURL(u, protocolPart, "", -1, null, null, filePart.toString(), null, null);
        } catch (final FileSystemException fse) {
            // This is rethrown to MalformedURLException in URL anyway
            throw new RuntimeException(fse.getMessage());
        }
    }

    @Override
    protected String toExternalForm(final URL u) {
        return u.getProtocol() + ":" + u.getFile();
    }
}