/* * 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.ambari.logfeeder.input.reader; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.util.zip.GZIPInputStream; import org.apache.log4j.Logger; class GZIPReader extends InputStreamReader { private static final Logger LOG = Logger.getLogger(GZIPReader.class); GZIPReader(String fileName) throws FileNotFoundException { super(getStream(fileName)); LOG.info("Created GZIPReader for file : " + fileName); } private static InputStream getStream(String fileName) { InputStream gzipStream = null; InputStream fileStream = null; try { fileStream = new FileInputStream(fileName); gzipStream = new GZIPInputStream(fileStream); } catch (Exception e) { LOG.error(e, e.getCause()); } return gzipStream; } /** * validating file based on magic number */ static boolean isValidFile(String fileName) { // TODO make it generic and put in factory itself try (InputStream is = new FileInputStream(fileName)) { byte[] signature = new byte[2]; int nread = is.read(signature); // read the gzip signature return nread == 2 && signature[0] == (byte) 0x1f && signature[1] == (byte) 0x8b; } catch (IOException e) { return false; } } }