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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.protect;
/**
* Static utility methods for validating input.
*
* @author bratseth
*/
public abstract class Validator {
/** Throws NullPointerException if the argument is null */
public static void ensureNotNull(String argumentDescription, Object argument) {
if (argument == null)
throw new NullPointerException(argumentDescription + " can not be null");
}
/** Throws NullPointerException if the argument is null */
public static void ensureNonEmpty(String argumentDescription, String argument) {
if (argument.isEmpty())
throw new IllegalArgumentException(argumentDescription + " can not be empty");
}
/**
* Throws an IllegalStateException if the given field value
* is initialized (not null)
*/
public static void ensureNotInitialized(String fieldDescription, Object fieldOwner, Object fieldValue) {
if (fieldValue != null) {
throw new IllegalStateException(fieldDescription + " of " + fieldOwner +
" cannot be changed, it is already set " + "to " + fieldValue);
}
}
/**
* Throws an IllegalArgumentException if the given argument is not
* in the given range
*
* @param argumentDescription a description of the argument
* @param from the range start, inclusive
* @param to the range end, inclusive
* @param argument the argument value to check
*/
public static void ensureInRange(String argumentDescription, int from, int to, int argument) {
if (argument < from || argument > to) {
throw new IllegalArgumentException(argumentDescription + " is " + argument +
" but must be between " + from + " and " + to);
}
}
/**
* Throws an IllegalArgumentException if the first argument is not strictly
* smaller than the second argument
*
* @param smallDescription description of the smallest argument
* @param small the smallest argument
* @param largeDescription description of the lergest argument
* @param large the largest argument
*/
public static void ensureSmaller(String smallDescription, int small, String largeDescription, int large) {
if (small >= large) {
throw new IllegalArgumentException(smallDescription + " is " + small + " but should be " +
"less than " + largeDescription + " " + large);
}
}
/**
* Throws an IllegalArgumentException if the first argument is not strictly
* smaller than the second argument
*
* @param smallDescription description of the smallest argument
* @param small the smallest argument
* @param largeDescription description of the largest argument
* @param large the largest argument
*/
@SuppressWarnings({ "rawtypes", "unchecked" })
public static void ensureSmaller(String smallDescription, Comparable small, String largeDescription, Comparable large) {
if (small.compareTo(large) >= 0) {
throw new IllegalArgumentException(smallDescription + " is " + small + " but should be " +
"less than " + largeDescription + " " + large);
}
}
/**
* Ensures that the given argument is true
*
* @param description of what is the case if the condition is false
* @param condition the condition to ensure is true
* @throws IllegalArgumentException if the given condition was false
*/
public static void ensure(String description, boolean condition) {
if ( ! condition) {
throw new IllegalArgumentException(description);
}
}
/**
* Ensure the given argument is true, if not throw IllegalArgumentException
* concatenating the String representation of the description arguments.
*/
public static void ensure(boolean condition, Object... description) {
if ( ! condition) {
StringBuilder msg = new StringBuilder();
for (Object part : description) {
msg.append(part.toString());
}
throw new IllegalArgumentException(msg.toString());
}
}
/**
* Ensures that an item is of a particular class
*
* @param description a description of the item to be checked
* @param item the item to check the type of
* @param type the type the given item should be instanceof
* @throws IllegalArgumentException if the given item is not of the correct type
*/
public static void ensureInstanceOf(String description, Object item, Class<?> type) {
if ( ! type.isAssignableFrom(item.getClass())) {
throw new IllegalArgumentException(description + " " + item + " should be an instance of " + type +
" but is " + item.getClass());
}
}
/**
* Ensures that an item is not of a particular class
*
* @param description a description of the item to be checked
* @param item the item to check the type of
* @param type the type the given item should NOT be instanceof
* @throws IllegalArgumentException if the given item is of the wrong type
*/
public static void ensureNotInstanceOf(String description, Object item, Class<?> type) {
if ( type.isAssignableFrom(item.getClass())) {
throw new IllegalArgumentException(description + " " + item + " should NOT be an instance of " + type +
" but is " + item.getClass());
}
}
}
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