001/*
002 * The MIT License
003 *
004 * Copyright (c) 2012, Ninja Squad
005 *
006 * Permission is hereby granted, free of charge, to any person obtaining a copy
007 * of this software and associated documentation files (the "Software"), to deal
008 * in the Software without restriction, including without limitation the rights
009 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
010 * copies of the Software, and to permit persons to whom the Software is
011 * furnished to do so, subject to the following conditions:
012 *
013 * The above copyright notice and this permission notice shall be included in
014 * all copies or substantial portions of the Software.
015 *
016 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
017 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
018 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
019 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
020 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
021 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
022 * THE SOFTWARE.
023 */
024
025package com.ninja_squad.dbsetup.util;
026
027/**
028 * Utility class to help verifying preconditions
029 * @author JB Nizet
030 */
031public final class Preconditions {
032    private Preconditions() {
033    }
034
035    /**
036     * Throws a NullPointerException with the given message if the given argument is <code>null</code>.
037     * @param argument the argument to check for <code>null</code>
038     * @param message the message of the thrown NullPointerException
039     * @throws NullPointerException if argument is <code>null</code>.
040     */
041    public static void checkNotNull(Object argument, String message) throws NullPointerException {
042        if (argument == null) {
043            throw new NullPointerException(message);
044        }
045    }
046
047    /**
048     * Throws an IllegalStateException with the given message if the given condition is <code>false</code>.
049     * @param condition the condition to check
050     * @param message the message of the thrown IllegalStateException
051     * @throws IllegalStateException if the condition is <code>false</code>.
052     */
053    public static void checkState(boolean condition, String message) throws IllegalStateException {
054        if (!condition) {
055            throw new IllegalStateException(message);
056        }
057    }
058
059    /**
060     * Throws an IllegalARgumentException with the given message if the given condition is <code>false</code>.
061     * @param condition the condition to check
062     * @param message the message of the thrown IllegalArgumentException
063     * @throws IllegalArgumentException if the condition is <code>false</code>.
064     */
065    public static void checkArgument(boolean condition, String message) throws IllegalStateException {
066        if (!condition) {
067            throw new IllegalArgumentException(message);
068        }
069    }
070}