org.apache.hadoop.fs.ftp.FTPInputStream.java Source code

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Here is the source code for org.apache.hadoop.fs.ftp.FTPInputStream.java

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/**
 * 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");
    }
}