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Styled XML parser is used by iText modules to parse HTML and XML
There is a newer version: 8.0.5
/*
    This file is part of the iText (R) project.
    Copyright (c) 1998-2023 iText Group NV
    Authors: iText Software.

    This program is offered under a commercial and under the AGPL license.
    For commercial licensing, contact us at https://itextpdf.com/sales.  For AGPL licensing, see below.

    AGPL licensing:
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see .
 */
package com.itextpdf.styledxmlparser.jsoup.helper;

/**
 * Simple validation methods. Designed for jsoup internal use
 */
public final class Validate {
    
    private Validate() {}

    /**
     * Validates that the object is not null
     * @param obj object to test
     */
    public static void notNull(Object obj) {
        if (obj == null)
            throw new IllegalArgumentException("Object must not be null");
    }

    /**
     * Validates that the object is not null
     * @param obj object to test
     * @param msg message to output if validation fails
     */
    public static void notNull(Object obj, String msg) {
        if (obj == null)
            throw new IllegalArgumentException(msg);
    }

    /**
     * Validates that the value is true
     * @param val object to test
     */
    public static void isTrue(boolean val) {
        if (!val)
            throw new IllegalArgumentException("Must be true");
    }

    /**
     * Validates that the value is true
     * @param val object to test
     * @param msg message to output if validation fails
     */
    public static void isTrue(boolean val, String msg) {
        if (!val)
            throw new IllegalArgumentException(msg);
    }

    /**
     * Validates that the value is false
     * @param val object to test
     */
    public static void isFalse(boolean val) {
        if (val)
            throw new IllegalArgumentException("Must be false");
    }

    /**
     * Validates that the value is false
     * @param val object to test
     * @param msg message to output if validation fails
     */
    public static void isFalse(boolean val, String msg) {
        if (val)
            throw new IllegalArgumentException(msg);
    }

    /**
     * Validates that the array contains no null elements
     * @param objects the array to test
     */
    public static void noNullElements(Object[] objects) {
        noNullElements(objects, "Array must not contain any null objects");
    }

    /**
     * Validates that the array contains no null elements
     * @param objects the array to test
     * @param msg message to output if validation fails
     */
    public static void noNullElements(Object[] objects, String msg) {
        for (Object obj : objects)
            if (obj == null)
                throw new IllegalArgumentException(msg);
    }

    /**
     * Validates that the string is not null and is not empty
     * @param string the string to test
     */
    public static void notEmpty(String string) {
        if (string == null || string.length() == 0)
            throw new IllegalArgumentException("String must not be empty");
    }

    /**
     * Validates that the string is not null and is not empty
     * @param string the string to test
     * @param msg message to output if validation fails
     */
    public static void notEmpty(String string, String msg) {
        if (string == null || string.length() == 0)
            throw new IllegalArgumentException(msg);
    }

    /**
     Cause a failure.
     @param msg message to output.
     */
    public static void fail(String msg) {
        throw new IllegalArgumentException(msg);
    }
}