| package org.apache.samoa.streams.fs; |
| |
| /* |
| * #%L |
| * SAMOA |
| * %% |
| * Copyright (C) 2014 - 2015 Apache Software Foundation |
| * %% |
| * Licensed 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. |
| * #L% |
| */ |
| |
| import java.io.InputStream; |
| import java.io.IOException; |
| import java.io.Serializable; |
| |
| /** |
| * An interface for FileStream's source (Local FS, HDFS,...) |
| * |
| * @author Casey |
| */ |
| public interface FileStreamSource extends Serializable { |
| |
| /** |
| * Init the source with file/directory path and file extension |
| * |
| * @param path |
| * File or directory path |
| * @param ext |
| * File extension to be used to filter files in a directory. If null, all files in the directory are |
| * accepted. |
| */ |
| public void init(String path, String ext); |
| |
| /** |
| * Reset the source |
| */ |
| public void reset() throws IOException; |
| |
| /** |
| * Retrieve InputStream for next file. This method will return null if we are at the last file in the list. |
| * |
| * @return InputStream for next file in the list |
| */ |
| public InputStream getNextInputStream(); |
| |
| /** |
| * Retrieve InputStream for current file. The "current pointer" is moved forward with getNextInputStream method. So if |
| * there was no invocation of getNextInputStream, this method will return null. |
| * |
| * @return InputStream for current file in the list |
| */ |
| public InputStream getCurrentInputStream(); |
| } |