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A library fo extended scalars for graphql-java

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package graphql.scalars.numeric;

import graphql.Internal;
import graphql.schema.GraphQLScalarType;

import java.util.function.Function;

/**
 * Access this via {@link graphql.scalars.ExtendedScalars#NonNegativeInt}
 */
@Internal
public final class NonNegativeIntScalar {

    private NonNegativeIntScalar() {}

    public static final GraphQLScalarType INSTANCE = GraphQLScalarType.newScalar()
            .name("NonNegativeInt")
            .description("An Int scalar that must be greater than or equal to zero")
            .coercing(new IntCoercing() {
                @Override
                protected Integer check(Integer i, Function exceptionMaker) {
                    if (i < 0) {
                        throw exceptionMaker.apply("The value must be greater than or equal to zero");
                    }
                    return i;
                }
            })
            .build();

}