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

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 boolean	allEmpty(Collection<?>... collections)
static boolean	anyElementEmpty(Collection<?> collection)
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(List<Object> recordKey, List<Object> targetKey)
static int	castCompare(Object recordKey, Object targetKey)
static void	close(Closeable closeable)
static List<Object>	constructMaxRecord(int keyLen)
static List<Object>	constructMinRecord(int keyLen)
static String	formatDate(int year, int month, int day)
static String	formatIntLessThan100(int val)
static String	formatIntLessThan10000(int val)
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 <T> boolean	isOptionalPresent(Optional<T> optional)
static <T> List<T>	makeNotNull(List<T> list)
static <T> List<T>	makeNotNull(T obj)
static Long	maybeUndefined(long val)
static boolean	noneEmpty(Collection<?>... collections)
static Pair<Integer,String>	processFileWithDelimiter(String filePath, String charset, java.util.function.Consumer<String> func, String delimiter) Process file by dilimiter.
static String	tailTrim(String value)

从类继承的方法 java.lang.Object

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

构造器详细资料

Utils

public Utils()

方法详细资料

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)

makeNotNull

public static <T> List<T> makeNotNull(T obj)

makeNotNull

public static <T> List<T> makeNotNull(List<T> list)

allEmpty

public static boolean allEmpty(Collection<?>... collections)

noneEmpty

public static boolean noneEmpty(Collection<?>... collections)

anyElementEmpty

public static boolean anyElementEmpty(Collection<?> collection)

castCompare

public static int castCompare(List<Object> recordKey,
                              List<Object> targetKey)

castCompare

public static int castCompare(Object recordKey,
                              Object targetKey)

close

public static void close(Closeable closeable)
                  throws IOException

抛出:

IOException

constructMaxRecord

public static List<Object> constructMaxRecord(int keyLen)

constructMinRecord

public static List<Object> constructMinRecord(int keyLen)

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

processFileWithDelimiter

public static Pair<Integer,String> processFileWithDelimiter(String filePath,
                                                            String charset,
                                                            java.util.function.Consumer<String> func,
                                                            String delimiter)

Process file by dilimiter.

参数:

filePath - file path

charset - encoding charset

func - consumer function to process each part separated by delimiter

delimiter - delimiter

返回:

pair, left is success processing count, right is the last string read

isOptionalPresent

public static <T> boolean isOptionalPresent(Optional<T> optional)

tailTrim

public static String tailTrim(String value)

formatDate

public static String formatDate(int year,
                                int month,
                                int day)

formatIntLessThan10000

public static String formatIntLessThan10000(int val)

formatIntLessThan100

public static String formatIntLessThan100(int val)