Package org.eclipse.collections.impl.block.factory

Class Functions

java.lang.Object
org.eclipse.collections.impl.block.factory.Functions
public final class Functions extends Object

  • Method Details

    • throwing

      public static <T, V> Function<T,V> throwing(ThrowingFunction<T,V> throwingFunction)
      Allows a lambda or anonymous inner class that needs to throw a checked exception to be safely wrapped as a Function that will throw a RuntimeException, wrapping the checked exception that is the cause.

    • throwing

      public static <T, V> Function<T,V> throwing(ThrowingFunction<T,V> throwingFunction, Function2<T,? super Throwable,? extends RuntimeException> rethrow)
      Allows a lambda or anonymous inner class that needs to throw a checked exception to be safely wrapped as a Function that will throw a user specified RuntimeException based on the provided function. The function is passed the current element and the checked exception that was thrown as context arguments.

    • cast

      public static <T, V> Function<T,V> cast(Function<T,V> function)
      Allows a Java 8 lambda and method reference to be used in a method taking a Function as a parameter without any ambiguity.

    • getPassThru

      public static <T> Function<T,T> getPassThru()
      Alias for identity(). Inlineable.
      See Also:

    • identity

      public static <T> Function<T,T> identity()
      Since:
      6.0

    • getTrue

      public static Function<Object,Boolean> getTrue()
      Since:
      6.0

    • getFalse

      public static Function<Object,Boolean> getFalse()
      Since:
      6.0

    • getFixedValue

      public static <T, V> Function<T,V> getFixedValue(V value)

    • getToClass

      public static Function<Object,Class<?>> getToClass()

    • getMathSinFunction

      public static Function<Number,Double> getMathSinFunction()

    • getNumberPassThru

      public static Function<Number,Number> getNumberPassThru()

    • getIntegerPassThru

      public static Function<Integer,Integer> getIntegerPassThru()

    • getLongPassThru

      public static Function<Long,Long> getLongPassThru()

    • getDoublePassThru

      public static Function<Double,Double> getDoublePassThru()

    • getStringPassThru

      public static Function<String,String> getStringPassThru()

    • getStringTrim

      public static Function<String,String> getStringTrim()

    • getToString

      public static Function<Object,String> getToString()

    • getNullSafeToString

      public static Function<Object,String> getNullSafeToString(String defaultValue)

    • toBooleanComparator

      public static <T> SerializableComparator<T> toBooleanComparator(BooleanFunction<T> function)

    • toByteComparator

      public static <T> SerializableComparator<T> toByteComparator(ByteFunction<T> function)

    • toCharComparator

      public static <T> SerializableComparator<T> toCharComparator(CharFunction<T> function)

    • toFloatComparator

      public static <T> SerializableComparator<T> toFloatComparator(FloatFunction<T> function)

    • toShortComparator

      public static <T> SerializableComparator<T> toShortComparator(ShortFunction<T> function)

    • toIntComparator

      public static <T> SerializableComparator<T> toIntComparator(IntFunction<T> function)

    • toDoubleComparator

      public static <T> SerializableComparator<T> toDoubleComparator(DoubleFunction<T> function)

    • toLongComparator

      public static <T> SerializableComparator<T> toLongComparator(LongFunction<T> function)

    • getStringToInteger

      public static Function<String,Integer> getStringToInteger()

    • withDefault

      public static <T, V> Function<T,V> withDefault(Function<? super T,? extends V> function, V defaultValue)

    • nullSafe

      public static <T, V> Function<T,V> nullSafe(Function<? super T,? extends V> function)

    • nullSafe

      public static <T, V> Function<T,V> nullSafe(Function<? super T,? extends V> function, V nullValue)

    • firstOfPair

      public static <V1> Function<Pair<V1,?>,V1> firstOfPair()

    • secondOfPair

      public static <V2> Function<Pair<?,V2>,V2> secondOfPair()

    • swappedPair

      public static <S, T> Function<Pair<S,T>,Pair<T,S>> swappedPair()
      Swap the input pair and return the swapped pair.
      Returns:
      A function that gets the swapped pair Iterable

    • bind

      public static <T, P, R> Function<T,R> bind(Function2<? super T,? super P,? extends R> function, P parameter)
      Bind the parameter passed to a Function2 into a new Function.
      Parameters:
      function - The Function2 to delegate the invocation to.
      parameter - The parameter the use in the invocation of the delegate function.
      Returns:
      A new Function

    • bind

      public static <T1, T2> Procedure<T1> bind(Procedure<? super T2> delegate, Function<? super T1,T2> function)
      Bind the input of a Procedure to the result of a function, returning a new Procedure.
      Parameters:
      delegate - The Procedure to delegate the invocation to.
      function - The Function that will create the input for the delegate
      Returns:
      A new Procedure

    • bind

      public static <T1, T2> ObjectIntProcedure<T1> bind(ObjectIntProcedure<? super T2> delegate, Function<? super T1,T2> function)
      Bind the input of a ObjectIntProcedure to the result of a function, returning a new ObjectIntProcedure.
      Parameters:
      delegate - The ObjectIntProcedure to delegate the invocation to.
      function - The Function that will create the input for the delegate
      Returns:
      A new ObjectIntProcedure

    • bind

      public static <T1, T2, T3> Procedure2<T1,T3> bind(Procedure2<? super T2,T3> delegate, Function<? super T1,T2> function)
      Bind the input of the first argument of a Procedure2 to the result of a function, returning a new Procedure2.
      Parameters:
      delegate - The Procedure2 to delegate the invocation to.
      function - The Function that will create the input for the delegate
      Returns:
      A new Procedure2

    • squaredInteger

      public static Function<Integer,Integer> squaredInteger()

    • firstNotNullValue

      public static <T, V> Function<T,V> firstNotNullValue(Function<T,V>... functions)

    • firstNotEmptyStringValue

      public static <T> Function<T,String> firstNotEmptyStringValue(Function<T,String>... functions)

    • firstNotEmptyCollectionValue

      public static <T1, T2, I extends Iterable<T2>> Function<T1,I> firstNotEmptyCollectionValue(Function<T1,I>... functions)

    • ifTrue

      public static <T, V> Function<T,V> ifTrue(Predicate<? super T> predicate, Function<? super T,? extends V> function)

    • ifElse

      public static <T, V> Function<T,V> ifElse(Predicate<? super T> predicate, Function<? super T,? extends V> trueFunction, Function<? super T,? extends V> falseFunction)

    • caseDefault

      public static <T extends Comparable<? super T>, V> CaseFunction<T,V> caseDefault(Function<? super T,? extends V> defaultFunction)

    • caseDefault

      public static <T extends Comparable<? super T>, V> CaseFunction<T,V> caseDefault(Function<? super T,? extends V> defaultFunction, Predicate<? super T> predicate, Function<? super T,? extends V> function)

    • synchronizedEach

      public static <T, V> Function<T,V> synchronizedEach(Function<T,V> function)

    • classForName

      public static Function<String,Class<?>> classForName()

    • chain

      public static <T1, T2, T3> Functions.FunctionChain<T1,T2,T3> chain(Function<T1,T2> function1, Function<? super T2,T3> function2)

    • chainBoolean

      public static <T1, T2> Functions.BooleanFunctionChain<T1,T2> chainBoolean(Function<T1,T2> function1, BooleanFunction<? super T2> function2)

    • chainByte

      public static <T1, T2> Functions.ByteFunctionChain<T1,T2> chainByte(Function<T1,T2> function1, ByteFunction<? super T2> function2)

    • chainChar

      public static <T1, T2> Functions.CharFunctionChain<T1,T2> chainChar(Function<T1,T2> function1, CharFunction<? super T2> function2)

    • chainDouble

      public static <T1, T2> Functions.DoubleFunctionChain<T1,T2> chainDouble(Function<T1,T2> function1, DoubleFunction<? super T2> function2)

    • chainFloat

      public static <T1, T2> Functions.FloatFunctionChain<T1,T2> chainFloat(Function<T1,T2> function1, FloatFunction<? super T2> function2)

    • chainInt

      public static <T1, T2> Functions.IntFunctionChain<T1,T2> chainInt(Function<T1,T2> function1, IntFunction<? super T2> function2)

    • chainLong

      public static <T1, T2> Functions.LongFunctionChain<T1,T2> chainLong(Function<T1,T2> function1, LongFunction<? super T2> function2)

    • chainShort

      public static <T1, T2> Functions.ShortFunctionChain<T1,T2> chainShort(Function<T1,T2> function1, ShortFunction<? super T2> function2)

    • pair

      public static <T, V1, V2> Function<T,Pair<V1,V2>> pair(Function<? super T,V1> function1, Function<? super T,V2> function2)

    • getKeyFunction

      public static <K> Function<Map.Entry<K,?>,K> getKeyFunction()
      Returns:
      A function that gets the key out of a Map.Entry

    • getValueFunction

      public static <V> Function<Map.Entry<?,V>,V> getValueFunction()
      Returns:
      A function that gets the value out of a Map.Entry

    • getSizeOf

      public static Function<Iterable<?>,Integer> getSizeOf()
      Returns:
      A function that gets the size of an Iterable