Package hu.icellmobilsoft.coffee.tool.utils.compress

Class GZIPUtil

java.lang.Object

hu.icellmobilsoft.coffee.tool.utils.compress.GZIPUtil

public class GZIPUtil
extends Object

Helper class to GZIP compress/decompress string contents

Example use of compress/decompress

 public static void main(String[] args) {
     String source = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><xmlRoot><xmlChild xmlField=\"xmlValue\">anotherXmlValue</xmlChild></xmlRoot>";
     try {
         System.out.println("source size: " + source.getBytes(StandardCharsets.UTF_8).length);
         long start = System.currentTimeMillis();
         byte[] compressed = compress(source.getBytes(StandardCharsets.UTF_8));
         long end = System.currentTimeMillis();
         System.out.println("compressed size: " + compressed.length + ", time: " + (end - start) + "ms");
         int decompressedSize = decompressedSize(compressed);
         System.out.println("original size: " + source.length() + ", decompressed size: " + decompressedSize);
         start = System.currentTimeMillis();
         byte[] decompressed = decompress(compressed);
         end = System.currentTimeMillis();
         System.out.println("decompressed: " + new String(decompressed, StandardCharsets.UTF_8));
         System.out.println("decompress time: " + (end - start) + "ms");
     } catch (Exception e) {
         e.printStackTrace();
     }
 }
 

Since:

1.0.0

Author:

robert.kaplar

Constructor Summary

Constructors

Constructor	Description
GZIPUtil()	Default constructor, constructs a new object.

Method Summary

Modifier and Type	Method	Description
static byte[]	compress(byte[] data)	Compress the source byte array content
static byte[]	decompress(byte[] data)	Decompress the compressed byte array content
static <T> T	decompress(byte[] data, Class<T> clazz)	Unzip and convert result from byte[].
static int	decompressedSize(byte[] data)	Visszaadja a GZIP eredeti meretet.
static boolean	isCompressed(byte[] bytes)	Determines if a byte array is compressed.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

GZIPUtil

public GZIPUtil()

Default constructor, constructs a new object.

Method Detail

compress

public static byte[] compress(byte[] data)
                       throws hu.icellmobilsoft.coffee.dto.exception.BaseException

Compress the source byte array content

Parameters:

data - input byte array

Returns:

compressed byte array

Throws:

hu.icellmobilsoft.coffee.dto.exception.BaseException - exception

decompress

public static byte[] decompress(byte[] data)
                         throws hu.icellmobilsoft.coffee.dto.exception.BaseException

Decompress the compressed byte array content

Parameters:

data - input byte array

Returns:

decompressed byte array

Throws:

hu.icellmobilsoft.coffee.dto.exception.BaseException - exception

decompress

public static <T> T decompress(byte[] data,
                               Class<T> clazz)
                        throws hu.icellmobilsoft.coffee.dto.exception.BaseException

Unzip and convert result from byte[].

Type Parameters:

T - destination type

Parameters:

data - input byte array

clazz - destination class

Returns:

unzipped and converted object

Throws:

hu.icellmobilsoft.coffee.dto.exception.BaseException - exception

decompressedSize

public static int decompressedSize(byte[] data)

Visszaadja a GZIP eredeti meretet. Valojaban nem mindig lehet szamolni vele, de megis van valami. Minta:

Parameters:

data - input adat

Returns:

eredeti meret

See Also:

https://stackoverflow.com/questions/7317243/gets-the-uncompressed-size-of-this-gzipinputstream

isCompressed

public static boolean isCompressed(byte[] bytes)

Determines if a byte array is compressed. The java.util.zip GZip implementaiton does not expose the GZip header so it is difficult to determine if a string is compressed.

Parameters:

bytes - an array of bytes

Returns:

true if the array is compressed or false otherwise

See Also:

https://stackoverflow.com/questions/4818468/how-to-check-if-inputstream-is-gzipped