/* | |
* 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; | |
} |