001/*
002 * Copyright 2012-2016 the original author or authors.
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.springframework.boot.cli.compiler.grape;
018
019import java.lang.reflect.Field;
020
021import groovy.grape.Grape;
022import groovy.grape.GrapeEngine;
023
024/**
025 * Utility to install a specific {@link Grape} engine with Groovy.
026 *
027 * @author Andy Wilkinson
028 */
029public abstract class GrapeEngineInstaller {
030
031        public static void install(GrapeEngine engine) {
032                synchronized (Grape.class) {
033                        try {
034                                Field field = Grape.class.getDeclaredField("instance");
035                                field.setAccessible(true);
036                                field.set(null, engine);
037                        }
038                        catch (Exception ex) {
039                                throw new IllegalStateException("Failed to install GrapeEngine", ex);
040                        }
041                }
042        }
043
044}