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/*
* FilterOptions
*
* Authors: Lasse Collin <lasse.collin@tukaani.org>
* Igor Pavlov <http://7-zip.org/>
*
* This file has been put into the public domain.
* You can do whatever you want with this file.
*/
package org.tukaani.xz;
import java.io.InputStream;
import java.io.IOException;
/**
* Base class for filter-specific options classes.
*/
public abstract class FilterOptions implements Cloneable {
/**
* Gets how much memory the encoder will need with
* the given filter chain. This function simply calls
* <code>getEncoderMemoryUsage()</code> for every filter
* in the array and returns the sum of the returned values.
*/
public static int getEncoderMemoryUsage(FilterOptions[] options) {
int m = 0;
for (int i = 0; i < options.length; ++i)
m += options[i].getEncoderMemoryUsage();
return m;
}
/**
* Gets how much memory the decoder will need with
* the given filter chain. This function simply calls
* <code>getDecoderMemoryUsage()</code> for every filter
* in the array and returns the sum of the returned values.
*/
public static int getDecoderMemoryUsage(FilterOptions[] options) {
int m = 0;
for (int i = 0; i < options.length; ++i)
m += options[i].getDecoderMemoryUsage();
return m;
}
/**
* Gets how much memory the encoder will need with these options.
*/
public abstract int getEncoderMemoryUsage();
/**
* Gets a raw (no XZ headers) encoder output stream using these options.
* Raw streams are an advanced feature. In most cases you want to store
* the compressed data in the .xz container format instead of using
* a raw stream. To use this filter in a .xz file, pass this object
* to XZOutputStream.
*/
public abstract FinishableOutputStream getOutputStream(
FinishableOutputStream out);
/**
* Gets how much memory the decoder will need to decompress the data
* that was encoded with these options.
*/
public abstract int getDecoderMemoryUsage();
/**
* Gets a raw (no XZ headers) decoder input stream using these options.
*/
public abstract InputStream getInputStream(InputStream in)
throws IOException;
abstract FilterEncoder getFilterEncoder();
FilterOptions() {}
}
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