Java InputStream Create getInputStream(File tarFile)

Description

If tarFile's extension is simply tar, then returns a new FileInputStream.

License

Open Source License

Exception

Parameter	Description
IllegalArgumentException	if tarFile has an unrecognized extension
IOException	if an I/O problem occurs

Declaration

private static InputStream getInputStream(File tarFile) throws IllegalArgumentException, IOException 

Method Source Code

//package com.java2s;
/*/*from   w w w .  ja v a 2  s. c  o m*/
Copyright ? 2008 Brent Boyer
    
This program is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
    
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the Lesser GNU General Public License for more details.
    
You should have received a copy of the Lesser GNU General Public License along with this program (see the license directory in this project).  If not, see <http://www.gnu.org/licenses/>.
*/

import java.io.File;

import java.io.FileInputStream;

import java.io.IOException;
import java.io.InputStream;

import java.util.zip.GZIPInputStream;

public class Main {
    /**
    * If tarFile's extension is simply tar, then returns a new FileInputStream.
    * Else if tarFile's extension is tar.gz or tgz, then returns a new GZIPnputStream wrapping a new FileInputStream.
    * <p>
    * Note: the result is never buffered, since the TarArchiveInputStream which will use the result always has an internal buffer.
    * <p>
    * @throws IllegalArgumentException if tarFile has an unrecognized extension
    * @throws IOException if an I/O problem occurs
    * @see <a href="http://www.gzip.org/">gzip home page</a>
    * @see <a href="http://www.brouhaha.com/~eric/tgz.html">.tar.gz file format FAQ</a>
    */
    private static InputStream getInputStream(File tarFile) throws IllegalArgumentException, IOException {
        String name = tarFile.getName().toLowerCase();
        if (name.endsWith(".tar")) {
            return new FileInputStream(tarFile);
        } else if (name.endsWith(".tar.gz") || name.endsWith(".tgz")) {
            return new GZIPInputStream(new FileInputStream(tarFile));
        } else {
            throw new IllegalArgumentException(
                    "tarFile = " + tarFile.getPath() + " has an invalid extension for a tar or tar/gzip file");
        }
    }
}

Related

1. asInputStream(Object content)
2. asInputStream(String str)
3. getInputStream(File f)
4. getInputStream(File jarFile, String fileName)
5. getInputStream(File tarFile)
6. getInputStream(File TheFile)
7. getInputStream(FileInputStream fileInput)
8. getInputStream(final File file)
9. getInputStream(final File file)