Package org.apache.hadoop.util.functional

Class FunctionalIO

java.lang.Object

org.apache.hadoop.util.functional.FunctionalIO

@Private
public final class FunctionalIO
extends java.lang.Object

Functional utilities for IO operations.

Method Summary

Modifier and Type	Method	Description
static <T> T	extractIOExceptions(java.util.function.Supplier<T> call)	Invoke the supplier, catching any UncheckedIOException raised, extracting the inner IOException and rethrowing it.
static <T,R> java.util.function.Function<T,R>	toUncheckedFunction(FunctionRaisingIOE<T,R> fun)	Convert a FunctionRaisingIOE as a Supplier.
static <T> java.util.function.Supplier<T>	toUncheckedIOExceptionSupplier(CallableRaisingIOE<T> call)	Wrap a CallableRaisingIOE as a Supplier.
static <T> T	uncheckIOExceptions(CallableRaisingIOE<T> call)	Invoke any operation, wrapping IOExceptions with UncheckedIOException.

Methods inherited from class java.lang.Object

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

Method Detail

uncheckIOExceptions

public static <T> T uncheckIOExceptions(CallableRaisingIOE<T> call)

Invoke any operation, wrapping IOExceptions with UncheckedIOException.

Type Parameters:

T - type of result

Parameters:

call - callable

Returns:

result

Throws:

java.io.UncheckedIOException - if an IOE was raised.

toUncheckedIOExceptionSupplier

public static <T> java.util.function.Supplier<T> toUncheckedIOExceptionSupplier(CallableRaisingIOE<T> call)

Wrap a CallableRaisingIOE as a Supplier.

Type Parameters:

T - type of result

Parameters:

call - call to wrap

Returns:

a supplier which invokes the call.

extractIOExceptions

public static <T> T extractIOExceptions(java.util.function.Supplier<T> call)
                                 throws java.io.IOException

Invoke the supplier, catching any UncheckedIOException raised, extracting the inner IOException and rethrowing it.

Type Parameters:

T - type of result

Parameters:

call - call to invoke

Returns:

result

Throws:

java.io.IOException - if the call raised an IOException wrapped by an UncheckedIOException.

toUncheckedFunction

public static <T,R> java.util.function.Function<T,R> toUncheckedFunction(FunctionRaisingIOE<T,R> fun)

Convert a FunctionRaisingIOE as a Supplier.

Type Parameters:

T - type of input

R - type of return value.

Parameters:

fun - function to wrap

Returns:

a new function which invokes the inner function and wraps exceptions.