| /* |
| * 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.vfs2.provider.hdfs; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| import org.apache.commons.vfs2.provider.AbstractRandomAccessContent; |
| import org.apache.commons.vfs2.util.RandomAccessMode; |
| import org.apache.hadoop.fs.FSDataInputStream; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| |
| /** |
| * Provides random access to content in an HdfsFileObject. Currently this only supports read operations. All write |
| * operations throw an {@link UnsupportedOperationException}. |
| * |
| * @since 2.1 |
| */ |
| public class HdfsRandomAccessContent extends AbstractRandomAccessContent |
| { |
| private final FSDataInputStream fis; |
| private final FileSystem fs; |
| private final Path path; |
| |
| /** |
| * Create random access content. |
| * |
| * @param path A Hadoop Path |
| * @param fs A Hadoop FileSystem |
| * @throws IOException when the path cannot be processed. |
| */ |
| public HdfsRandomAccessContent(final Path path, final FileSystem fs) throws IOException |
| { |
| super(RandomAccessMode.READ); |
| this.fs = fs; |
| this.path = path; |
| this.fis = this.fs.open(this.path); |
| } |
| |
| /** |
| * @see org.apache.commons.vfs2.RandomAccessContent#close() |
| */ |
| @Override |
| public void close() throws IOException |
| { |
| this.fis.close(); |
| } |
| |
| /** |
| * @see org.apache.commons.vfs2.RandomAccessContent#getFilePointer() |
| */ |
| @Override |
| public long getFilePointer() throws IOException |
| { |
| return this.fis.getPos(); |
| } |
| |
| /** |
| * @see org.apache.commons.vfs2.RandomAccessContent#getInputStream() |
| */ |
| @Override |
| public InputStream getInputStream() throws IOException |
| { |
| return this.fis; |
| } |
| |
| /** |
| * @see org.apache.commons.vfs2.RandomAccessContent#length() |
| */ |
| @Override |
| public long length() throws IOException |
| { |
| return this.fs.getFileStatus(this.path).getLen(); |
| } |
| |
| /** |
| * @see java.io.DataInput#readBoolean() |
| */ |
| @Override |
| public boolean readBoolean() throws IOException |
| { |
| return this.fis.readBoolean(); |
| } |
| |
| /** |
| * @see java.io.DataInput#readByte() |
| */ |
| @Override |
| public byte readByte() throws IOException |
| { |
| return this.fis.readByte(); |
| } |
| |
| /** |
| * @see java.io.DataInput#readChar() |
| */ |
| @Override |
| public char readChar() throws IOException |
| { |
| return this.fis.readChar(); |
| } |
| |
| /** |
| * @see java.io.DataInput#readDouble() |
| */ |
| @Override |
| public double readDouble() throws IOException |
| { |
| return this.fis.readDouble(); |
| } |
| |
| /** |
| * @see java.io.DataInput#readFloat() |
| */ |
| @Override |
| public float readFloat() throws IOException |
| { |
| return this.fis.readFloat(); |
| } |
| |
| /** |
| * @see java.io.DataInput#readFully(byte[]) |
| */ |
| @Override |
| public void readFully(final byte[] b) throws IOException |
| { |
| throw new UnsupportedOperationException(); |
| } |
| |
| /** |
| * @see java.io.DataInput#readFully(byte[], int, int) |
| */ |
| @Override |
| public void readFully(final byte[] b, final int off, final int len) throws IOException |
| { |
| throw new UnsupportedOperationException(); |
| } |
| |
| /** |
| * @see java.io.DataInput#readInt() |
| */ |
| @Override |
| public int readInt() throws IOException |
| { |
| return this.fis.readInt(); |
| } |
| |
| /** |
| * @see java.io.DataInput#readLine() |
| */ |
| @Override |
| @SuppressWarnings("deprecation") |
| public String readLine() throws IOException |
| { |
| return this.fis.readLine(); |
| } |
| |
| /** |
| * @see java.io.DataInput#readLong() |
| */ |
| @Override |
| public long readLong() throws IOException |
| { |
| return this.fis.readLong(); |
| } |
| |
| /** |
| * @see java.io.DataInput#readShort() |
| */ |
| @Override |
| public short readShort() throws IOException |
| { |
| return this.fis.readShort(); |
| } |
| |
| /** |
| * @see java.io.DataInput#readUnsignedByte() |
| */ |
| @Override |
| public int readUnsignedByte() throws IOException |
| { |
| return this.fis.readUnsignedByte(); |
| } |
| |
| /** |
| * @see java.io.DataInput#readUnsignedShort() |
| */ |
| @Override |
| public int readUnsignedShort() throws IOException |
| { |
| return this.fis.readUnsignedShort(); |
| } |
| |
| /** |
| * @see java.io.DataInput#readUTF() |
| */ |
| @Override |
| public String readUTF() throws IOException |
| { |
| return this.fis.readUTF(); |
| } |
| |
| /** |
| * @see org.apache.commons.vfs2.RandomAccessContent#seek(long) |
| */ |
| @Override |
| public void seek(final long pos) throws IOException |
| { |
| this.fis.seek(pos); |
| } |
| |
| /** |
| * @see org.apache.commons.vfs2.RandomAccessContent#setLength(long) |
| */ |
| @Override |
| public void setLength(final long newLength) throws IOException |
| { |
| throw new UnsupportedOperationException(); |
| } |
| |
| /** |
| * @see java.io.DataInput#skipBytes(int) |
| */ |
| @Override |
| public int skipBytes(final int n) throws IOException |
| { |
| throw new UnsupportedOperationException(); |
| } |
| |
| } |