ai.vespa.validation.Validation Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of vespajlib Show documentation
Library for use in Java components of Vespa. Shared code which do not fit anywhere else.
There is a newer version: 8.409.18
// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package ai.vespa.validation;

import com.yahoo.yolean.Exceptions;

import java.util.Objects;
import java.util.function.Function;
import java.util.regex.Pattern;

import static java.util.Objects.requireNonNull;

/**
 * Every raw {@link String} is a potential bug, and a security risk!
 * This class has utility methods for validating strings, which are often user input.
 *
 * @author jonmv
 */
public class Validation {

    private Validation() { }

    /** Parses and returns the given string, or throws an exception with some context in the message. */
    public static  T parse(String value, Function parser, String description) {
        try {
            return parser.apply(requireNonNull(value, description + " cannot be null"));
        }
        catch (RuntimeException e) {
            throw new IllegalArgumentException("failed parsing " + description +
                                               " '" + value + "': " + Exceptions.toMessageString(e));
        }
    }

    /** Requires the value to have a length in range lower to upper, inclusive. */
    public static String requireLength(String value, String description, int lower, int upper) {
        requireInRange(value.length(), description, lower, upper);
        return value;
    }

    /** Requires the value to match the given pattern. */
    public static String requireMatch(String value, String description, Pattern pattern) {
        return require(pattern.matcher(value).matches(), value, description + " must match '" + pattern + "'");
    }

    /** Requires the value to be non-blank. */
    public static String requireNonBlank(String value, String description) {
        return require( ! value.isBlank(), value, description + " cannot be blank");
    }

    /** Requires the value to be at least the lower bound. */
    public static > T requireAtLeast(T value, String description, T lower) {
        return require(lower.compareTo(value) <= 0, value, description + " must be at least '" + lower + "'");
    }

    /** Requires the value to be at most the upper bound. */
    public static > T requireAtMost(T value, String description, T upper) {
        return require(upper.compareTo(value) >= 0, value, description + " must be at most '" + upper + "'");
    }

    /** Requires the value to be at least the lower bound, and at most the upper bound. */
    public static > T requireInRange(T value, String description, T lower, T upper) {
        if (lower.compareTo(upper) > 0) throw new IllegalArgumentException("lower bound cannot be greater than upper bound, " +
                                                                           "but got '" + lower + "' > '" + upper + "'");
        return require(lower.compareTo(value) <= 0 && upper.compareTo(value) >= 0, value,
                       description + " must be at least '" + lower + "' and at most '" + upper + "'");
    }

    /** Returns the argument if the condition is true, otherwise throws. */
    public static  T require(boolean condition, T value, String description) {
        if (condition) return value;
        throw new IllegalArgumentException(description + ", but got: '" + value + "'");
    }

    public static void requireNonNulls(Object... objs) {
        for (int i = 0; i < objs.length; i++) {
            int effectivelyFinal = i;
            Objects.requireNonNull(objs[i], () -> "Argument at index %d is null".formatted(effectivelyFinal));
        }
    }

}