org.apache.commons.compress.archivers.zip

Class StreamCompressor

java.lang.Object

org.apache.commons.compress.archivers.zip.StreamCompressor

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable

public abstract class StreamCompressor
extends java.lang.Object
implements java.io.Closeable

Encapsulates a Deflater and crc calculator, handling multiple types of output streams. Currently ZipEntry.DEFLATED and ZipEntry.STORED are the only supported compression methods.

Since:

1.10

Method Summary

Modifier and Type	Method and Description
void	close()
static StreamCompressor	create(int compressionLevel, ScatterGatherBackingStore bs) Create a stream compressor with the given compression level.
static StreamCompressor	create(ScatterGatherBackingStore bs) Create a stream compressor with the default compression level.
void	deflate(java.io.InputStream source, int method) Deflate the given source using the supplied compression method
long	getBytesRead() Return the number of bytes read from the source stream
long	getBytesWrittenForLastEntry() The number of bytes written to the output for the last entry
long	getCrc32() The crc32 of the last deflated file
long	getTotalBytesWritten() The total number of bytes written to the output for all files
void	writeCounted(byte[] data)
void	writeCounted(byte[] data, int offset, int length)

Methods inherited from class java.lang.Object

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

Method Detail

create

public static StreamCompressor create(int compressionLevel,
                                      ScatterGatherBackingStore bs)

Create a stream compressor with the given compression level.

Parameters:

compressionLevel - The Deflater compression level

bs - The ScatterGatherBackingStore to receive output

Returns:

A stream compressor

create

public static StreamCompressor create(ScatterGatherBackingStore bs)

Create a stream compressor with the default compression level.

Parameters:

bs - The ScatterGatherBackingStore to receive output

Returns:

A stream compressor

getCrc32

public long getCrc32()

The crc32 of the last deflated file

Returns:

the crc32

getBytesRead

public long getBytesRead()

Return the number of bytes read from the source stream

Returns:

The number of bytes read, never negative

getBytesWrittenForLastEntry

public long getBytesWrittenForLastEntry()

The number of bytes written to the output for the last entry

Returns:

The number of bytes, never negative

getTotalBytesWritten

public long getTotalBytesWritten()

The total number of bytes written to the output for all files

Returns:

The number of bytes, never negative

deflate

public void deflate(java.io.InputStream source,
                    int method)
             throws java.io.IOException

Deflate the given source using the supplied compression method

Parameters:

source - The source to compress

method - The #ZipArchiveEntry compression method

Throws:

java.io.IOException - When failures happen

close

public void close()
           throws java.io.IOException

Specified by:

close in interface java.io.Closeable

Specified by:

close in interface java.lang.AutoCloseable

Throws:

java.io.IOException

writeCounted

public void writeCounted(byte[] data)
                  throws java.io.IOException

Throws:

java.io.IOException

writeCounted

public void writeCounted(byte[] data,
                         int offset,
                         int length)
                  throws java.io.IOException

Throws:

java.io.IOException