Returns an object of a list where at least one result of the functions matches with the value The U param of the functions is given by another function - Java Lambda Stream

Java examples for Lambda Stream:Function

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Description

Returns an object of a list where at least one result of the functions matches with the value The U param of the functions is given by another function

Demo Code


    //package com.java2s;
    import java.util.List;
    import java.util.Optional;
    import java.util.function.Function;

    public class Main {
        /**/*from w w  w . j  a  v a  2s. c o m*/
         * Returns an object of a list where at least one result of the functions matches with the value<br>
         * The U param of the functions is given by another function<br>
         * Yeah, I know, it's complicated
         * @param objects        The object list
         * @param mapperFunction The function
         * @param value          The value to match
         * @param functions      The functions array
         * @param <T>            The object type
         * @param <U>            The mapping type
         * @param <V>            The result type of the array's functions
         * @return An object of the list or null
         */
        @SafeVarargs
public static <T, U, V> T getFirstWithFunctionWithCondition(List<T> objects, Function<T, U> mapperFunction, V value, Function<U, V>... functions) {
    Optional<T> first = objects.stream()
            .filter(object -> {
                U methodVal = mapperFunction.apply(object);
                boolean has = false;
                for (Function<? super U, V> function : functions) {
                    has = has || value.equals(function.apply(methodVal));
                }
                return has;
            }).findFirst();
    return first.isPresent() ? first.get() : null;
}
    }

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