org.apache.drill.exec.expr.fn.impl

Class StringFunctionHelpers

java.lang.Object

org.apache.drill.exec.expr.fn.impl.StringFunctionHelpers

public class StringFunctionHelpers
extends Object

Constructor Summary

Constructors

Constructor and Description
StringFunctionHelpers()

Method Summary

Modifier and Type	Method and Description
static long	getDate(DrillBuf buf, int start, int end)
static String	getStringFromVarCharHolder(NullableVarCharHolder varCharHolder) Convert a NullableVarCharHolder to a String.
static String	getStringFromVarCharHolder(VarCharHolder varCharHolder) Convert a VarCharHolder to a String.
static String	initCap(String source) Capitalizes first letter in each word.
static boolean	isReadableAsDate(DrillBuf buf, int start, int end) Takes a string value, specified as a buffer with a start and end and returns true if the value can be read as a date.
static String	toStringFromUTF16(int start, int end, DrillBuf buffer)
static String	toStringFromUTF8(int start, int end, DrillBuf buffer)
static int	varTypesToInt(int start, int end, DrillBuf buffer)
static long	varTypesToLong(int start, int end, DrillBuf buffer)

Methods inherited from class java.lang.Object

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

Constructor Detail

StringFunctionHelpers

public StringFunctionHelpers()

Method Detail

varTypesToLong

public static long varTypesToLong(int start,
                                  int end,
                                  DrillBuf buffer)

varTypesToInt

public static int varTypesToInt(int start,
                                int end,
                                DrillBuf buffer)

initCap

public static String initCap(String source)

Capitalizes first letter in each word. Any symbol except digits and letters is considered as word delimiter.

Parameters:

source - input characters

getStringFromVarCharHolder

public static String getStringFromVarCharHolder(VarCharHolder varCharHolder)

Convert a VarCharHolder to a String. VarCharHolders are designed specifically for object reuse and mutability, only use this method when absolutely necessary for interacting with interfaces that must take a String.

Parameters:

varCharHolder - a mutable wrapper object that stores a variable length char array, always in UTF-8

Returns:

String of the bytes interpreted as UTF-8

getStringFromVarCharHolder

public static String getStringFromVarCharHolder(NullableVarCharHolder varCharHolder)

Convert a NullableVarCharHolder to a String.

toStringFromUTF8

public static String toStringFromUTF8(int start,
                                      int end,
                                      DrillBuf buffer)

toStringFromUTF16

public static String toStringFromUTF16(int start,
                                       int end,
                                       DrillBuf buffer)

getDate

public static long getDate(DrillBuf buf,
                           int start,
                           int end)

isReadableAsDate

public static boolean isReadableAsDate(DrillBuf buf,
                                       int start,
                                       int end)

Takes a string value, specified as a buffer with a start and end and returns true if the value can be read as a date.

Parameters:

buf -

start -

end -

Returns:

true iff the string value can be read as a date