| /* |
| * 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.vfs.provider.ftp; |
| |
| import org.apache.commons.vfs.FileSystemException; |
| import org.apache.commons.vfs.provider.AbstractRandomAccessStreamContent; |
| import org.apache.commons.vfs.util.RandomAccessMode; |
| |
| import java.io.DataInputStream; |
| import java.io.FilterInputStream; |
| import java.io.IOException; |
| |
| /** |
| * @author <a href="http://commons.apache.org/vfs/team-list.html">Commons VFS team</a> |
| */ |
| class FtpRandomAccessContent extends AbstractRandomAccessStreamContent |
| { |
| protected long filePointer; |
| |
| private final FtpFileObject fileObject; |
| private DataInputStream dis; |
| private FtpFileObject.FtpInputStream mis; |
| |
| FtpRandomAccessContent(final FtpFileObject fileObject, RandomAccessMode mode) |
| { |
| super(mode); |
| |
| this.fileObject = fileObject; |
| // fileSystem = (FtpFileSystem) this.fileObject.getFileSystem(); |
| } |
| |
| public long getFilePointer() throws IOException |
| { |
| return filePointer; |
| } |
| |
| public void seek(long pos) throws IOException |
| { |
| if (pos == filePointer) |
| { |
| // no change |
| return; |
| } |
| |
| if (pos < 0) |
| { |
| throw new FileSystemException("vfs.provider/random-access-invalid-position.error", |
| new Object[] |
| { |
| new Long(pos) |
| }); |
| } |
| if (dis != null) |
| { |
| close(); |
| } |
| |
| filePointer = pos; |
| } |
| |
| protected DataInputStream getDataInputStream() throws IOException |
| { |
| if (dis != null) |
| { |
| return dis; |
| } |
| |
| // FtpClient client = fileSystem.getClient(); |
| mis = fileObject.getInputStream(filePointer); |
| dis = new DataInputStream(new FilterInputStream(mis) |
| { |
| public int read() throws IOException |
| { |
| int ret = super.read(); |
| if (ret > -1) |
| { |
| filePointer++; |
| } |
| return ret; |
| } |
| |
| public int read(byte[] b) throws IOException |
| { |
| int ret = super.read(b); |
| if (ret > -1) |
| { |
| filePointer += ret; |
| } |
| return ret; |
| } |
| |
| public int read(byte[] b, int off, int len) throws IOException |
| { |
| int ret = super.read(b, off, len); |
| if (ret > -1) |
| { |
| filePointer += ret; |
| } |
| return ret; |
| } |
| |
| public void close() throws IOException |
| { |
| FtpRandomAccessContent.this.close(); |
| } |
| }); |
| |
| return dis; |
| } |
| |
| |
| public void close() throws IOException |
| { |
| if (dis != null) |
| { |
| mis.abort(); |
| |
| // this is to avoid recursive close |
| DataInputStream oldDis = dis; |
| dis = null; |
| oldDis.close(); |
| mis = null; |
| } |
| } |
| |
| public long length() throws IOException |
| { |
| return fileObject.getContent().getSize(); |
| } |
| } |