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.util.stream.Stream;
020
021import org.apache.commons.vfs2.FileObject;
022import org.apache.commons.vfs2.FileSystemException;
023import org.apache.commons.vfs2.FileSystemOptions;
024
025/**
026 * Description.
027 */
028public abstract class CompositeFileProvider extends AbstractFileProvider {
029
030    private static final int INITIAL_BUFSZ = 80;
031
032    /**
033     * Constructs a new instance.
034     */
035    public CompositeFileProvider() {
036    }
037
038    /**
039     * Locates a file object, by absolute URI.
040     *
041     * @param baseFile The base FileObject.
042     * @param uri The file to find.
043     * @param fileSystemOptions The options for the FileSystem.
044     * @return A FileObject for the located file.
045     * @throws FileSystemException if an error occurs.
046     */
047    @Override
048    public FileObject findFile(final FileObject baseFile, final String uri, final FileSystemOptions fileSystemOptions)
049            throws FileSystemException {
050        final StringBuilder buf = new StringBuilder(INITIAL_BUFSZ);
051
052        UriParser.extractScheme(getContext().getFileSystemManager().getSchemes(), uri, buf);
053        Stream.of(getSchemes()).forEach(scheme -> buf.insert(0, scheme + ":"));
054
055        return getContext().getFileSystemManager().resolveFile(buf.toString(), fileSystemOptions);
056    }
057
058    /**
059     * The schemes known.
060     *
061     * @return Array of supported schemes.
062     */
063    protected abstract String[] getSchemes();
064}