FTPInputStream.java
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上传日期:2018-01-08
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文件大小:3k
- /**
- * 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.hadoop.fs.ftp;
- import java.io.IOException;
- import java.io.InputStream;
- import org.apache.commons.net.ftp.FTPClient;
- import org.apache.hadoop.fs.FSInputStream;
- import org.apache.hadoop.fs.FileSystem;
- public class FTPInputStream extends FSInputStream {
- InputStream wrappedStream;
- FTPClient client;
- FileSystem.Statistics stats;
- boolean closed;
- long pos;
- public FTPInputStream(InputStream stream, FTPClient client,
- FileSystem.Statistics stats) {
- if (stream == null) {
- throw new IllegalArgumentException("Null InputStream");
- }
- if (client == null || !client.isConnected()) {
- throw new IllegalArgumentException("FTP client null or not connected");
- }
- this.wrappedStream = stream;
- this.client = client;
- this.stats = stats;
- this.pos = 0;
- this.closed = false;
- }
- public long getPos() throws IOException {
- return pos;
- }
- // We don't support seek.
- public void seek(long pos) throws IOException {
- throw new IOException("Seek not supported");
- }
- public boolean seekToNewSource(long targetPos) throws IOException {
- throw new IOException("Seek not supported");
- }
- public synchronized int read() throws IOException {
- if (closed) {
- throw new IOException("Stream closed");
- }
- int byteRead = wrappedStream.read();
- if (byteRead >= 0) {
- pos++;
- }
- if (stats != null & byteRead >= 0) {
- stats.incrementBytesRead(1);
- }
- return byteRead;
- }
- public synchronized int read(byte buf[], int off, int len) throws IOException {
- if (closed) {
- throw new IOException("Stream closed");
- }
- int result = wrappedStream.read(buf, off, len);
- if (result > 0) {
- pos += result;
- }
- if (stats != null & result > 0) {
- stats.incrementBytesRead(result);
- }
- return result;
- }
- public synchronized void close() throws IOException {
- if (closed) {
- throw new IOException("Stream closed");
- }
- super.close();
- closed = true;
- if (!client.isConnected()) {
- throw new FTPException("Client not connected");
- }
- boolean cmdCompleted = client.completePendingCommand();
- client.logout();
- client.disconnect();
- if (!cmdCompleted) {
- throw new FTPException("Could not complete transfer, Reply Code - "
- + client.getReplyCode());
- }
- }
- // Not supported.
- public boolean markSupported() {
- return false;
- }
- public void mark(int readLimit) {
- // Do nothing
- }
- public void reset() throws IOException {
- throw new IOException("Mark not supported");
- }
- }