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SPL(Structured Process Language) A programming language specially for structured data computing.

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package com.scudata.dw;

import net.jpountz.lz4.LZ4Compressor;
import net.jpountz.lz4.LZ4Factory;
import net.jpountz.lz4.LZ4FastDecompressor;

/**
 * LZ4ѹ????ѹ??????
 * @author runqian
 *
 */
public class LZ4Util {
	private static ThreadLocal local = new ThreadLocal() {
		protected synchronized LZ4Util initialValue() {
			return new LZ4Util();
		}
	};
	
	//ѹ??
	private LZ4Compressor compressor = LZ4Factory.fastestInstance().fastCompressor();
	
	//??ѹ
	private LZ4FastDecompressor decompressor = LZ4Factory.fastestInstance().fastDecompressor();
	
	private int count;
	
	private LZ4Util() {
	}
	
	public static LZ4Util instance() {
		return local.get();
	}
	
	/**
	 * ????ѹ????ĳ???
	 * @return
	 */
	public int getCount() {
		return count;
	}
	
	/**
	 * ????ѹ??????ֽ????飬?ֽ????鳤?ȿ??ܴ???ʵ?ʳ??ȣ???Ҫ????getCountȡ??ʵ?ʳ???
	 * @param bytes
	 * @return
	 */
	public byte[] compress(byte []bytes) {
		int maxLen = compressor.maxCompressedLength(bytes.length);
		byte []buffer = new byte[maxLen];
		
		count = compressor.compress(bytes, buffer);
		return buffer;
	}
	
	/**
	 * ??ѹ??srcCountΪ??ѹ?󳤶?
	 * @param bytes
	 * @param buffer
	 * @param srcCount
	 */
	public void decompress(byte []bytes, byte []buffer, int srcCount) {
		decompressor.decompress(bytes, buffer, srcCount);
	}
	
	public void decompress(byte []bytes, int offset, byte []buffer, int srcCount) {
		decompressor.decompress(bytes, offset, buffer, 0, srcCount);
	}
}