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 org.apache.commons.vfs2.FileObject; 020import org.apache.commons.vfs2.FileSystemException; 021import org.apache.commons.vfs2.FileSystemOptions; 022 023/** 024 * Description. 025 */ 026public abstract class CompositeFileProvider extends AbstractFileProvider { 027 private static final int INITIAL_BUFSZ = 80; 028 029 public CompositeFileProvider() { 030 super(); 031 } 032 033 /** 034 * The schemes known. 035 * 036 * @return Array of supported schemes. 037 */ 038 protected abstract String[] getSchemes(); 039 040 /** 041 * Locates a file object, by absolute URI. 042 * 043 * @param baseFile The base FileObject. 044 * @param uri The file to find. 045 * @param fileSystemOptions The options for the FileSystem. 046 * @return A FileObject for the located file. 047 * @throws FileSystemException if an error occurs. 048 */ 049 @Override 050 public FileObject findFile(final FileObject baseFile, final String uri, final FileSystemOptions fileSystemOptions) 051 throws FileSystemException { 052 final StringBuilder buf = new StringBuilder(INITIAL_BUFSZ); 053 054 UriParser.extractScheme(uri, buf); 055 056 final String[] schemes = getSchemes(); 057 for (final String scheme : schemes) { 058 buf.insert(0, ":"); 059 buf.insert(0, scheme); 060 } 061 062 final FileObject fo = getContext().getFileSystemManager().resolveFile(buf.toString(), fileSystemOptions); 063 return fo; 064 } 065}