Package org.apache.flink.table.jdbc.utils

Class DriverUtils

java.lang.Object

org.apache.flink.table.jdbc.utils.DriverUtils

public class DriverUtils
extends Object

Utils methods are copied from flink-core for flink jdbc driver to avoid excessive dependency.

Constructor Summary

Constructors

Constructor	Description
DriverUtils()

Method Summary

Modifier and Type	Method	Description
static void	checkArgument(boolean condition, Object errorMessage)	Checks the given boolean condition, and throws an IllegalArgumentException if the condition is not met (evaluates to false).
static <T> T	checkNotNull(T reference, String errorMessage)	Ensures that the given object reference is not null.
static Map<String,String>	fromProperties(Properties properties)	Generate map from given properties.
static boolean	isNullOrWhitespaceOnly(String str)	Checks if the string is null, empty, or contains only whitespace characters.

Methods inherited from class java.lang.Object

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

Constructor Detail

DriverUtils

public DriverUtils()

Method Detail

checkNotNull

public static <T> T checkNotNull(@Nullable
                                 T reference,
                                 @Nullable
                                 String errorMessage)

Ensures that the given object reference is not null. Upon violation, a NullPointerException with the given message is thrown.

Parameters:

reference - The object reference

errorMessage - The message for the NullPointerException that is thrown if the check fails.

Returns:

The object reference itself (generically typed).

Throws:

NullPointerException - Thrown, if the passed reference was null.

checkArgument

public static void checkArgument(boolean condition,
                                 @Nullable
                                 Object errorMessage)

Checks the given boolean condition, and throws an IllegalArgumentException if the condition is not met (evaluates to false). The exception will have the given error message.

Parameters:

condition - The condition to check

errorMessage - The message for the IllegalArgumentException that is thrown if the check fails.

Throws:

IllegalArgumentException - Thrown, if the condition is violated.

isNullOrWhitespaceOnly

public static boolean isNullOrWhitespaceOnly(String str)

Checks if the string is null, empty, or contains only whitespace characters. A whitespace character is defined via Character.isWhitespace(char).

Parameters:

str - The string to check

Returns:

True, if the string is null or blank, false otherwise.

fromProperties

public static Map<String,String> fromProperties(Properties properties)

Generate map from given properties.

Parameters:

properties - the given properties

Returns:

the result map