com.alibaba.innodb.java.reader.util

类 Utils

java.lang.Object

com.alibaba.innodb.java.reader.util.Utils

public class Utils
extends Object

Utils

作者:

xu.zx

字段概要

字段

限定符和类型	字段和说明
static String	MAX
static String	MIN

构造器概要

构造器

构造器和说明
Utils()

方法概要

限定符和类型	方法和说明
static String	arrayToString(Object[] a, StringBuilder b, String delimiter) Use StringBuilder to build string out of an array.
static String	arrayToString(Object[] a, StringBuilder b, String delimiter, boolean newLine) Use StringBuilder to build string out of an array.
static <O> O	cast(Object object)
static int	castCompare(Object recordKey, Object targetKey)
static void	close(Closeable closeable)
static int[]	getBitArray(SliceInput input, int numOfBits) 对于null超过8个字段byte[]是LSB，即排序高的字段在低字节里面。
static <T> List<String>	getFromBitArray(List<T> list, int[] bitArray, java.util.function.Function<T,String> func)
static String	humanReadableBytes(long bytes)
static String	humanReadableBytes(long bytes, boolean si)
static Long	maybeUndefined(long val)
static Object	tryCastString(Object object, String type)

从类继承的方法 java.lang.Object

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

字段详细资料

MAX

public static final String MAX

另请参阅:

常量字段值

MIN

public static final String MIN

另请参阅:

常量字段值

构造器详细资料

Utils

public Utils()

方法详细资料

tryCastString

public static Object tryCastString(Object object,
                                   String type)

cast

public static <O> O cast(Object object)

humanReadableBytes

public static String humanReadableBytes(long bytes)

humanReadableBytes

public static String humanReadableBytes(long bytes,
                                        boolean si)

maybeUndefined

public static Long maybeUndefined(long val)

getBitArray

public static int[] getBitArray(SliceInput input,
                                int numOfBits)

对于null超过8个字段byte[]是LSB，即排序高的字段在低字节里面。 例如9个null字段，col按顺序的bitmap如下，表示

   低位          高位
        col9  col2 col4
   [00000001][0,1,0,1,0,0,0,0]
 

参数:

input - SliceInput

numOfBits - number of bits

返回:

bit array

getFromBitArray

public static <T> List<String> getFromBitArray(List<T> list,
                                               int[] bitArray,
                                               java.util.function.Function<T,String> func)

castCompare

public static int castCompare(Object recordKey,
                              Object targetKey)

close

public static void close(Closeable closeable)
                  throws IOException

抛出:

IOException

arrayToString

public static String arrayToString(Object[] a,
                                   StringBuilder b,
                                   String delimiter)

Use StringBuilder to build string out of an array.

Sometimes by reusing StringBuilder, we can avoid creating many StringBuilder and good to garbage collection.

参数:

a - array

b - reusable StringBuilder

delimiter - delimiter

返回:

array string

arrayToString

public static String arrayToString(Object[] a,
                                   StringBuilder b,
                                   String delimiter,
                                   boolean newLine)

Use StringBuilder to build string out of an array.

Sometimes by reusing StringBuilder, we can avoid creating many StringBuilder and good to garbage collection.

参数:

a - array

b - reusable StringBuilder

delimiter - delimiter

newLine - if this is a new line, if true, write slash n at the end

返回:

array string