com.xxdb.data.BasicChunkMeta Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of api-java Show documentation

The messaging and data conversion protocol between Java and DolphinDB server

There is a newer version: 1.0.27

package com.xxdb.data;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import com.xxdb.io.AbstractExtendedDataOutputStream;
import com.xxdb.io.ExtendedDataInput;
import com.xxdb.io.ExtendedDataOutput;

public class BasicChunkMeta extends AbstractEntity implements Entity{
	private String path;
	private byte[] id;
	private int version;
	//TODO: we may change this field to long type
	private int size;
	private byte flag;
	private List sites;

	public BasicChunkMeta(ExtendedDataInput in) throws IOException{
		in.readShort(); //skip the length of the data
		path = in.readString();
		id  = new byte[16];
		in.readFully(id);
		version = in.readInt();
		size = in.readInt();
		flag = in.readByte();
		sites = new ArrayList<>();
		int copyCount = in.readByte();
		for(int i=0; i0)
				str.append(", ");
			str.append(sites.get(i));
		}
		str.append("}, v");
		str.append(version);
		str.append(", ");
		str.append(size);
		if(isSplittable())
			str.append(", splittable]");
		else
			str.append("]");
		return str.toString();
	}

	@Override
	public void write(ExtendedDataOutput output) throws IOException {
		int length = 27 + AbstractExtendedDataOutputStream.getUTFlength(path, 0, 0) + sites.size();
		for(String site : sites)
			length += AbstractExtendedDataOutputStream.getUTFlength(site, 0, 0);
		output.writeShort(length);
		output.writeString(path);
		output.write(id);
		output.writeInt(version);
		output.writeInt(size);
		output.writeByte(flag);
		output.writeByte(sites.size());
		for(String site : sites)
			output.writeUTF(site);
	}
	
	private String getUUIDString(byte[] uuid){
		char[] buf = new char[37];
	
		buf[8] = '-';
		buf[13] = '-';
		buf[18] = '-';
		buf[23] = '-';
		buf[36] = 0;
		for(int i=0; i<4; ++i)
			charToHexPair(uuid[i], buf, 2*i);
		charToHexPair(uuid[4], buf, 9);
		charToHexPair(uuid[5], buf, 11);
		charToHexPair(uuid[6], buf, 14);
		charToHexPair(uuid[7], buf, 16);
		charToHexPair(uuid[8], buf, 19);
		charToHexPair(uuid[9], buf, 21);
		for(int i=10; i<16; ++i)
			charToHexPair(uuid[i], buf, 4 + 2*i);
		return new String(buf);
	}
	
	private void charToHexPair(byte v, char[] buf, int offset){
		int low  = v & 15;
		int high = (v & 255) >> 4;
		buf[0 + offset] = (char)(high<10 ? high + 48 : high + 87);
		buf[1 + offset] = (char)(low<10 ? low + 48 : low + 87);
	}
}