001/*
002 * Copyright (C) 2009-2011 Mathias Doenitz
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.parboiled.support;
018
019import org.parboiled.errors.GrammarException;
020
021/**
022 * Utility methods for grammar integrity checks.
023 */
024public final class Checks {
025
026    private Checks() {}
027
028    /**
029     * Throws a GrammarException if the given condition is not met.
030     *
031     * @param condition          the condition
032     * @param errorMessageFormat the error message format
033     * @param errorMessageArgs   the error message arguments
034     */
035    public static void ensure(boolean condition, String errorMessageFormat, Object... errorMessageArgs) {
036        if (!condition) {
037            throw new GrammarException(errorMessageFormat, errorMessageArgs);
038        }
039    }
040
041    /**
042     * Throws a GrammarException if the given condition is not met.
043     *
044     * @param condition    the condition
045     * @param errorMessage the error message
046     */
047    public static void ensure(boolean condition, String errorMessage) {
048        if (!condition) {
049            throw new GrammarException(errorMessage);
050        }
051    }
052
053}