Package org.apache.commons.io.function
Interface IOFunction<T,R> 
- Type Parameters:
- T- the type of the input to the operations.
- R- the return type of the operations.
- All Known Subinterfaces:
- IOUnaryOperator<T>
- Functional Interface:
- This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
Like 
Function but throws IOException.- Since:
- 2.7
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Method SummaryModifier and TypeMethodDescriptiondefault IOConsumer<T> Returns a composedIOFunctionthat first applies this function to its input, and then applies theafterconsumer to the result.default <V> IOFunction<T, V> Returns a composedIOFunctionthat first applies this function to its input, and then applies theafterfunction to the result.default IOConsumer<T> andThen(IOConsumer<? super R> after) Returns a composedIOFunctionthat first applies this function to its input, and then applies theafterconsumer to the result.default <V> IOFunction<T, V> andThen(IOFunction<? super R, ? extends V> after) Returns a composedIOFunctionthat first applies this function to its input, and then applies theafterfunction to the result.Applies this function to the given argument.default <V> IOFunction<V, R> Returns a composedIOFunctionthat first applies thebeforefunction to its input, and then applies this function to the result.default IOSupplier<R> Returns a composedIOFunctionthat first applies thebeforefunction to its input, and then applies this function to the result.default <V> IOFunction<V, R> compose(IOFunction<? super V, ? extends T> before) Returns a composedIOFunctionthat first applies thebeforefunction to its input, and then applies this function to the result.default IOSupplier<R> compose(IOSupplier<? extends T> before) Returns a composedIOFunctionthat first applies thebeforefunction to its input, and then applies this function to the result.static <T> IOFunction<T, T> identity()Returns aIOFunctionthat always returns its input argument.
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Method Details- 
identityReturns aIOFunctionthat always returns its input argument.- Type Parameters:
- T- the type of the input and output objects to the function
- Returns:
- a function that always returns its input argument
 
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andThenReturns a composedIOFunctionthat first applies this function to its input, and then applies theafterconsumer to the result. If evaluation of either function throws an exception, it is relayed to the caller of the composed function.- Parameters:
- after- the consumer to apply after this function is applied
- Returns:
- a composed function that first applies this function and then applies the afterconsumer
- Throws:
- NullPointerException- if after is null
- See Also:
 
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andThenReturns a composedIOFunctionthat first applies this function to its input, and then applies theafterfunction to the result. If evaluation of either function throws an exception, it is relayed to the caller of the composed function.- Type Parameters:
- V- the type of output of the- afterfunction, and of the composed function
- Parameters:
- after- the function to apply after this function is applied
- Returns:
- a composed function that first applies this function and then applies the afterfunction
- Throws:
- NullPointerException- if after is null
- See Also:
 
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andThenReturns a composedIOFunctionthat first applies this function to its input, and then applies theafterconsumer to the result. If evaluation of either function throws an exception, it is relayed to the caller of the composed function.- Parameters:
- after- the consumer to apply after this function is applied
- Returns:
- a composed function that first applies this function and then applies the afterconsumer
- Throws:
- NullPointerException- if after is null
- See Also:
 
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andThenReturns a composedIOFunctionthat first applies this function to its input, and then applies theafterfunction to the result. If evaluation of either function throws an exception, it is relayed to the caller of the composed function.- Type Parameters:
- V- the type of output of the- afterfunction, and of the composed function
- Parameters:
- after- the function to apply after this function is applied
- Returns:
- a composed function that first applies this function and then applies the afterfunction
- Throws:
- NullPointerException- if after is null
- See Also:
 
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applyApplies this function to the given argument.- Parameters:
- t- the function argument
- Returns:
- the function result
- Throws:
- IOException- if an I/O error occurs.
 
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asFunction- Returns:
- an UncheckedIOException Function.
- Since:
- 2.12.0
 
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composeReturns a composedIOFunctionthat first applies thebeforefunction to its input, and then applies this function to the result. If evaluation of either function throws an exception, it is relayed to the caller of the composed function.- Type Parameters:
- V- the type of input to the- beforefunction, and to the composed function
- Parameters:
- before- the function to apply before this function is applied
- Returns:
- a composed function that first applies the beforefunction and then applies this function
- Throws:
- NullPointerException- if before is null
- See Also:
 
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composeReturns a composedIOFunctionthat first applies thebeforefunction to its input, and then applies this function to the result. If evaluation of either function throws an exception, it is relayed to the caller of the composed function.- Type Parameters:
- V- the type of input to the- beforefunction, and to the composed function
- Parameters:
- before- the function to apply before this function is applied
- Returns:
- a composed function that first applies the beforefunction and then applies this function
- Throws:
- NullPointerException- if before is null
- See Also:
 
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composeReturns a composedIOFunctionthat first applies thebeforefunction to its input, and then applies this function to the result. If evaluation of either function throws an exception, it is relayed to the caller of the composed function.- Parameters:
- before- the supplier which feeds the application of this function
- Returns:
- a composed function that first applies the beforefunction and then applies this function
- Throws:
- NullPointerException- if before is null
- See Also:
 
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composeReturns a composedIOFunctionthat first applies thebeforefunction to its input, and then applies this function to the result. If evaluation of either function throws an exception, it is relayed to the caller of the composed function.- Parameters:
- before- the supplier which feeds the application of this function
- Returns:
- a composed function that first applies the beforefunction and then applies this function
- Throws:
- NullPointerException- if before is null
- See Also:
 
 
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