135 lines
3.1 KiB
Java
135 lines
3.1 KiB
Java
/*
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* Copyright (C) 2021 Christian Pierre MOMON <christian@momon.org>
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*
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* This file is part of Logar, simple tool to manage http log files.
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*
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* Logar is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* Logar is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with Logar. If not, see <http://www.gnu.org/licenses/>.
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*/
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package org.april.logar.util;
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import java.io.BufferedReader;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.io.InputStreamReader;
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import java.util.zip.GZIPInputStream;
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import org.apache.commons.io.IOUtils;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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/**
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* The Class LineIterator.
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*/
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public class LineIterator
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{
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private static Logger logger = LoggerFactory.getLogger(LineIterator.class);
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public static final String DEFAULT_CHARSET_NAME = "UTF-8";
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private BufferedReader in;
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private String nextLine;
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private boolean ready;
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/**
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* Instantiates a new http log iterator.
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*
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* @param source
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* the source
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* @throws IOException
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* Signals that an I/O exception has occurred.
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*/
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public LineIterator(final File source) throws IOException
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{
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if (source.getName().endsWith(".gz"))
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{
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this.in = new BufferedReader(new InputStreamReader(new GZIPInputStream(new FileInputStream(source))));
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}
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else
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{
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this.in = new BufferedReader(new InputStreamReader(new FileInputStream(source), DEFAULT_CHARSET_NAME));
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}
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this.nextLine = null;
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this.ready = false;
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}
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/**
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* Close.
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*/
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public void close()
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{
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IOUtils.closeQuietly(this.in);
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}
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/**
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* Checks for next.
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*
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* @return true, if successful
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* @throws IOException
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*/
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public boolean hasNext() throws IOException
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{
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boolean result;
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setReady();
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if (this.nextLine == null)
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{
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result = false;
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close();
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}
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else
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{
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result = true;
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}
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//
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return result;
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}
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/**
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* Next.
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*
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* @return the http log
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* @throws IOException
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*/
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public String next() throws IOException
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{
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String result;
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setReady();
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result = this.nextLine;
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this.ready = false;
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//
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return result;
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}
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/**
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* Read next line.
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*
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* @throws IOException
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*/
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private void setReady() throws IOException
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{
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if (!this.ready)
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{
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this.nextLine = this.in.readLine();
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this.ready = true;
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}
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}
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}
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