| /* |
| * 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.backend.datastorage;
|
|
|
| import java.io.InputStream;
|
| import java.io.IOException;
|
|
|
| /**
|
| * Unix-like API for an input stream that supports random access.
|
| *
|
| */
|
| public abstract class SeekableInputStream extends InputStream {
|
|
|
| public enum FLAGS {
|
| SEEK_SET,
|
| SEEK_CUR,
|
| SEEK_END,
|
| }
|
|
|
| /**
|
| * Seeks to a given offset as specified by whence flags.
|
| * If whence is SEEK_SET, offset is added to beginning of stream
|
| * If whence is SEEK_CUR, offset is added to current position inside stream
|
| * If whence is SEEK_END, offset is added to end of file position
|
| *
|
| * @param offset
|
| * @param whence
|
| * @throws IOException
|
| */
|
| public abstract void seek(long offset, FLAGS whence) throws IOException;
|
|
|
| /**
|
| * Returns current offset
|
| *
|
| * @return offset
|
| * @throws IOException
|
| */
|
| public abstract long tell() throws IOException;
|
| }
|