| /* |
| * 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.pig.test.utils; |
| |
| import java.io.RandomAccessFile; |
| import java.io.File; |
| import java.io.FileNotFoundException; |
| import java.io.IOException; |
| |
| import org.apache.pig.backend.datastorage.*; |
| |
| public class LocalSeekableInputStream extends SeekableInputStream { |
| |
| protected RandomAccessFile file; |
| protected long curMark; |
| |
| public LocalSeekableInputStream(File file) throws FileNotFoundException { |
| this.file = new RandomAccessFile(file, "r"); |
| this.curMark = 0; |
| } |
| |
| @Override |
| public void seek(long offset, FLAGS whence) throws IOException { |
| long targetPos; |
| |
| switch (whence) { |
| case SEEK_SET: { |
| targetPos = offset; |
| break; |
| } |
| case SEEK_CUR: { |
| targetPos = this.file.getFilePointer() + offset; |
| break; |
| } |
| case SEEK_END: { |
| targetPos = this.file.length() + offset; |
| break; |
| } |
| default: { |
| throw new IOException("Invalid seek option: " + whence); |
| } |
| } |
| |
| this.file.seek(targetPos); |
| } |
| |
| @Override |
| public long tell() throws IOException { |
| return this.file.getFilePointer(); |
| } |
| |
| @Override |
| public int read() throws IOException { |
| return this.file.read(); |
| } |
| |
| @Override |
| public int read(byte[] b) throws IOException { |
| return this.file.read(b); |
| } |
| |
| @Override |
| public int read(byte[] b, int off, int len ) throws IOException { |
| return this.file.read(b, off, len); |
| } |
| |
| @Override |
| public int available() throws IOException { |
| return (int)( this.file.length() - this.file.getFilePointer() ); |
| } |
| |
| @Override |
| public long skip(long n) throws IOException { |
| long skipped = 0; |
| |
| if (n > 0) { |
| skipped = this.file.length() - tell(); |
| |
| seek(n, FLAGS.SEEK_CUR); |
| } |
| |
| return skipped; |
| } |
| |
| @Override |
| public void close() throws IOException { |
| this.file.close(); |
| } |
| |
| @Override |
| public void mark(int readlimit) { |
| try { |
| this.curMark = tell(); |
| } |
| catch (IOException e) { |
| ; |
| } |
| } |
| |
| @Override |
| public void reset() throws IOException { |
| seek(this.curMark, FLAGS.SEEK_SET); |
| } |
| |
| @Override |
| public boolean markSupported() { |
| return true; |
| } |
| } |