Package com.oss.util

Class CompressOutputStream

java.lang.Object

java.io.OutputStream

java.io.FilterOutputStream

java.util.zip.DeflaterOutputStream

com.oss.util.CompressOutputStream

All Implemented Interfaces:

Closeable, Flushable, AutoCloseable

public class CompressOutputStream
extends DeflaterOutputStream

This class extends CompressOutputStream and facilitates temporary in-memory buffering of encoding. The buffering is used to insert compression prefix before encoding prior to writing them to a target output stream.

Since:

ASN.1/Java 5.1.0

Constructor Summary

Constructors

Constructor	Description
CompressOutputStream(OutputStream out)	Constructs CompressOutputStream with a default compressor and buffer size.
CompressOutputStream(OutputStream out, Deflater deflater)	Constructs CompressOutputStream with the specified compressor and a default buffer size.
CompressOutputStream(OutputStream out, Deflater deflater, int size)	Constructs CompressOutputStream with the specified compressor and buffer size.

Method Summary

Modifier and Type	Method	Description
void	finish()	Finishes writing compressed data to the output stream without closing the underlying stream.
void	write(byte[] b, int off, int len)	Writes an array of bytes to the compressed output stream.

Methods inherited from class java.util.zip.DeflaterOutputStream

close, flush, write

Methods inherited from class java.io.FilterOutputStream

write

Methods inherited from class java.io.OutputStream

nullOutputStream

Methods inherited from class java.lang.Object

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

Constructor Details

CompressOutputStream

public CompressOutputStream(OutputStream out)

Constructs CompressOutputStream with a default compressor and buffer size.

Parameters:

out - the output stream

CompressOutputStream

public CompressOutputStream(OutputStream out,
 Deflater deflater)

Constructs CompressOutputStream with the specified compressor and a default buffer size.

Parameters:

out - the output stream

deflater - the compressor ("deflater")

CompressOutputStream

public CompressOutputStream(OutputStream out,
 Deflater deflater,
 int size)

Constructs CompressOutputStream with the specified compressor and buffer size.

Parameters:

out - the output stream

deflater - the compressor ("deflater")

size - the output buffer size

Throws:

IllegalArgumentException - if size is <= 0 Constructs CompressOutputStream and attaches it to sink. Additionally specifies the initial capacity of the internal buffer and size increment to expand the buffer when its capacity is exhausted.

Method Details

write

public void write(byte[] b,
 int off,
 int len)
           throws IOException

Writes an array of bytes to the compressed output stream. This method will block until all the bytes are written.

Overrides:

write in class DeflaterOutputStream

Parameters:

b - the data to be written

off - the start offset of the data

len - the length of the data

Throws:

IOException - if an I/O error has occurred

finish

public void finish()
            throws IOException

Finishes writing compressed data to the output stream without closing the underlying stream. Use this method when applying multiple filters in succession to the same output stream.

Overrides:

finish in class DeflaterOutputStream

Throws:

IOException - if an I/O error has occurred