Package net.hydromatic.sqllogictest.util

Interface ICastable

All Known Subinterfaces:

ISqlTestOperation

All Known Implementing Classes:

HsqldbExecutor, JdbcExecutor, NoExecutor, PostgresExecutor, SltSqlStatement, SqlSltTestExecutor, SqlTestExecutor, SqlTestQuery

public interface ICastable

Utility interface providing some useful casting methods.

Method Summary

Modifier and Type	Method	Description
default <T> T	as(PrintStream err, Class<T> clazz, @Nullable String failureMessage)	Cast this object ot the specified type.
default <T> @Nullable T	as(Class<T> clazz)	Cast this object ot the specified type.
static <T> @Nullable T	as(Object obj, Class<T> clazz, String s)
default void	error(PrintStream err, String message)	Print an error when a cast fails.
default <T> boolean	is(Class<T> clazz)	Check whether this object can be cast to the specified type.
default <T> T	to(PrintStream err, Class<T> clazz)	Cast this object to the specified type.

Method Detail

as

default <T> @Nullable T as(Class<T> clazz)

Cast this object ot the specified type.

Type Parameters:

T - Type of expected object.

Parameters:

clazz - Type to cast to.

Returns:

An object of type T or null if the cast cannot be performed.

as

static <T> @Nullable T as(Object obj,
                          Class<T> clazz,
                          String s)

error

default void error(PrintStream err,
                   String message)

Print an error when a cast fails.

Parameters:

err - Stream where error is printed.

message - Message to print.

as

default <T> T as(PrintStream err,
                 Class<T> clazz,
                 @Nullable String failureMessage)

Cast this object ot the specified type.

Type Parameters:

T - Type of expected object.* @param err

Parameters:

clazz - Type to cast to.

failureMessage - Message to display if the cast fails.

Returns:

An object of type T or null if the cast cannot be performed.

to

default <T> T to(PrintStream err,
                 Class<T> clazz)

Cast this object to the specified type.

Type Parameters:

T - Type expected. Throws when the cast cannot be performed.

Parameters:

err - Stream where errors are displayed.

clazz - Type to cast to.

Returns:

A non-null object of the specified type.

is

default <T> boolean is(Class<T> clazz)

Check whether this object can be cast to the specified type.

Type Parameters:

T - Type expected.

Parameters:

clazz - Type to cast to.

Returns:

True if the cast can be performed.