eleme.openapi.sdk.media.trace.DeviceId Maven / Gradle / Ivy

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package eleme.openapi.sdk.media.trace;

import eleme.openapi.sdk.media.common.EncodeUtil;
import eleme.openapi.sdk.media.utils.IOUtils;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.util.UUID;

/**
 * Created by huamulou on 15/12/9.
 */
public class DeviceId {
    private String savePath;
    private String deviceId;


    public DeviceId(String savePath) {
        this.savePath = savePath;
    }


    public String getValue() {
        if (deviceId != null) return deviceId;
        synchronized (this) {
            if (deviceId != null) return deviceId;
            deviceId = readFromFile();
            if (deviceId != null) return deviceId;
            deviceId = getUUID();
            writeToFile(deviceId);
            return deviceId;
        }
    }

    public byte[] asBytes(String id) {
        UUID uuid = UUID.fromString(id);
        long msb = uuid.getMostSignificantBits();
        long lsb = uuid.getLeastSignificantBits();
        byte[] buffer = new byte[16];

        for (int i = 0; i < 8; i++) {
            buffer[i] = (byte) (msb >>> 8 * (7 - i));
        }
        for (int i = 8; i < 16; i++) {
            buffer[i] = (byte) (lsb >>> 8 * (7 - i));
        }
        return buffer;

    }

    private String getUUID() {
        return ShorterUUID.uuid();
    }

    private String shorter(String arg) {
        byte[] res = EncodeUtil.encodeWithBase64(asBytes(arg));
        try {
            return new String(res, 0, res.length - 2, "utf-8");
        } catch (UnsupportedEncodingException e) {
            //
            return null;
        }
    }

    private String readFromFile() {
        File file = new File(savePath);
        if (file.exists()) {
            InputStream is = null;
            try {
                is = new FileInputStream(file);
                return IOUtils.toString(is);
            } catch (Throwable e) {
                //
            } finally {
                IOUtils.closeQuietly(is);
            }
        }
        return null;
    }

    private String writeToFile(String arg) {
        File file = new File(savePath);
        OutputStream out = null;
        try {
            out = new FileOutputStream(file);
            OutputStreamWriter writer = new OutputStreamWriter(out, "utf-8");
            writer.write(arg);
            writer.flush();
            out.flush();
        } catch (Throwable e) {
            //
        } finally {
            IOUtils.closeQuietly(out);
        }
        return null;
    }


}