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// Copyright Yahoo. 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.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> T parse(String value, Function<String, T> 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 extends Comparable<? super T>> 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 extends Comparable<? super T>> 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 extends Comparable<? super T>> 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> T require(boolean condition, T value, String description) {
if (condition) return value;
throw new IllegalArgumentException(description + ", but got: '" + value + "'");
}
}
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