Java GZip File Check isGZIPFileEmpty(File f)

Description

is GZIP File Empty

License

Apache License

Exception

Parameter	Description
IOException	if the file is not a gzip file or can't be read

Return

true iff the given file is a gzip-compressed file with no content; the file itself may not be empty because it contains gzip headers and footers

Declaration

public static boolean isGZIPFileEmpty(File f) throws IOException 

Method Source Code

//package com.java2s;
/*//w w w  .  j  a  v a2s  .co  m
 * Copyright Myrrix Ltd
 *
 * 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.
 */

import java.io.File;
import java.io.FileInputStream;

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

import java.util.zip.GZIPInputStream;

public class Main {
    /**
     * @return true iff the given file is a gzip-compressed file with no content; the file itself may not
     *  be empty because it contains gzip headers and footers
     * @throws IOException if the file is not a gzip file or can't be read
     */
    public static boolean isGZIPFileEmpty(File f) throws IOException {
        InputStream in = new GZIPInputStream(new FileInputStream(f));
        try {
            return in.read() == -1;
        } finally {
            in.close();
        }
    }
}

Related

1. isGzip(String file)
2. isGZipEnding(File file)
3. isGzipFile(File f)
4. isGZipFile(File file)
5. isGzipFile(File file)
6. isGzipFilename(File file)
7. isGzipped(File f)
8. isGzipped(File file)
9. isGZipped(final File f)