Package com.alibaba.druid.util

Class Utils

java.lang.Object

com.alibaba.druid.util.Utils

public class Utils
extends Object

Field Summary

Fields

Modifier and Type	Field	Description
static int	DEFAULT_BUFFER_SIZE

Constructor Summary

Constructors

Constructor	Description
Utils()

Method Summary

Modifier and Type	Method	Description
static long	copy(InputStream input, OutputStream output)
static boolean	equals(Object a, Object b)
static long	fnv_32_lower(String key)
static long	fnv_64(String input)
static long	fnv_64_lower(String key)
static Boolean	getBoolean(Properties properties, String key)
static <T> T	getIfNull(T object, T defaultValue)	Returns a default value if the object passed is null.
static Integer	getInteger(Properties properties, String key)
static Long	getLong(Properties properties, String key)
static String	getStackTrace(Throwable ex)
static Date	getStartTime()
static String	hex(int hash)
static String	hex(long hash)
static String	hex_t(long hash)
static Class<?>	loadClass(String className)
static void	loadFromFile(String path, Set<String> set)
static Properties	loadProperties(String resource)
static String	md5(String text)
static byte[]	md5Bytes(String text)
static long	murmurhash2_64(byte[] data, int length, int seed)	murmur hash 2.0, The murmur hash is a relatively fast hash function from http://murmurhash.googlepages.com/ for platforms with efficient multiplication.
static long	murmurhash2_64(String text)
static void	putLong(byte[] b, int off, long val)
static String	read(InputStream in)
static String	read(Reader reader)
static String	read(Reader reader, int length)
static byte[]	readByteArray(InputStream input)
static byte[]	readByteArrayFromResource(String resource)
static String	readFromResource(String resource)
static List<String>	readLines(String resource)
static String	toString(StackTraceElement[] stackTrace)
static String	toString(Date date)

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_BUFFER_SIZE

public static final int DEFAULT_BUFFER_SIZE

See Also:

Constant Field Values

Constructor Detail

Utils

public Utils()

Method Detail

read

public static String read(InputStream in)

loadProperties

public static Properties loadProperties(String resource)

readLines

public static List<String> readLines(String resource)

readFromResource

public static String readFromResource(String resource)
                               throws IOException

Throws:

IOException

readByteArrayFromResource

public static byte[] readByteArrayFromResource(String resource)
                                        throws IOException

Throws:

IOException

readByteArray

public static byte[] readByteArray(InputStream input)
                            throws IOException

Throws:

IOException

copy

public static long copy(InputStream input,
                        OutputStream output)
                 throws IOException

Throws:

IOException

read

public static String read(Reader reader)

read

public static String read(Reader reader,
                          int length)

toString

public static String toString(Date date)

getStackTrace

public static String getStackTrace(Throwable ex)

toString

public static String toString(StackTraceElement[] stackTrace)

getBoolean

public static Boolean getBoolean(Properties properties,
                                 String key)

getInteger

public static Integer getInteger(Properties properties,
                                 String key)

getLong

public static Long getLong(Properties properties,
                           String key)

loadClass

public static Class<?> loadClass(String className)

getStartTime

public static final Date getStartTime()

murmurhash2_64

public static long murmurhash2_64(String text)

murmurhash2_64

public static long murmurhash2_64(byte[] data,
                                  int length,
                                  int seed)

murmur hash 2.0, The murmur hash is a relatively fast hash function from http://murmurhash.googlepages.com/ for platforms with efficient multiplication.

md5Bytes

public static byte[] md5Bytes(String text)

md5

public static String md5(String text)

putLong

public static void putLong(byte[] b,
                           int off,
                           long val)

equals

public static boolean equals(Object a,
                             Object b)

hex

public static String hex(int hash)

hex

public static String hex(long hash)

hex_t

public static String hex_t(long hash)

fnv_64

public static long fnv_64(String input)

fnv_64_lower

public static long fnv_64_lower(String key)

fnv_32_lower

public static long fnv_32_lower(String key)

loadFromFile

public static void loadFromFile(String path,
                                Set<String> set)

getIfNull

public static <T> T getIfNull(T object,
                              T defaultValue)

Returns a default value if the object passed is null.