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Functional utilities for Java: core APIs

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package org.javafunk.funk;

import org.javafunk.funk.functors.Mapper;

import java.math.BigDecimal;
import java.math.BigInteger;

import static com.google.common.base.Preconditions.checkNotNull;

public class Integers {
    public static Mapper fromStringToInteger() {
        return new Mapper() {
            @Override public Integer map(String input) {
                checkNotNull(input);
                return Integer.valueOf(input);
            }
        };
    }

    public static Mapper fromLongToInteger() {
        return new Mapper() {
            @Override public Integer map(Long input) {
                return input.intValue();
            }
        };
    }

    public static Mapper fromBigIntegerToInteger() {
        return new Mapper() {
            @Override public Integer map(BigInteger input) {
                return input.intValue();
            }
        };
    }

    public static Mapper fromFloatToInteger() {
        return new Mapper() {
            @Override public Integer map(Float input) {
                return input.intValue();
            }
        };
    }

    public static Mapper fromDoubleToInteger() {
        return new Mapper() {
            @Override public Integer map(Double input) {
                return input.intValue();
            }
        };
    }

    public static Mapper fromBigDecimalToInteger() {
        return new Mapper() {
            @Override public Integer map(BigDecimal input) {
                return input.intValue();
            }
        };
    }
}