001package ball.annotation.processing;
002/*-
003 * ##########################################################################
004 * Utilities
005 * %%
006 * Copyright (C) 2008 - 2022 Allen D. Ball
007 * %%
008 * Licensed under the Apache License, Version 2.0 (the "License");
009 * you may not use this file except in compliance with the License.
010 * You may obtain a copy of the License at
011 *
012 *      http://www.apache.org/licenses/LICENSE-2.0
013 *
014 * Unless required by applicable law or agreed to in writing, software
015 * distributed under the License is distributed on an "AS IS" BASIS,
016 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
017 * See the License for the specific language governing permissions and
018 * limitations under the License.
019 * ##########################################################################
020 */
021/* import com.sun.tools.javac.processing.JavacProcessingEnvironment; */
022/* import com.sun.tools.javac.util.Context; */
023import java.lang.reflect.Method;
024import javax.annotation.processing.ProcessingEnvironment;
025import javax.tools.JavaFileManager;
026import lombok.NoArgsConstructor;
027import lombok.ToString;
028
029import static lombok.AccessLevel.PRIVATE;
030
031/**
032 * JDK 8, 9, and 10-specific methods for {@link AbstractProcessor}.
033 *
034 * @author {@link.uri mailto:ball@hcf.dev Allen D. Ball}
035 */
036@NoArgsConstructor(access = PRIVATE) @ToString
037public abstract class Shims {
038
039    /**
040     * Method to get the {@link JavaFileManager} from a
041     * {@link ProcessingEnvironment}.
042     *
043     * @param   env             The {@link ProcessingEnvironment}.
044     *
045     * @return  The {@link JavaFileManager} if it can be obtained;
046     *          {@code null} otherwise.
047     */
048    @SuppressWarnings({ "sunapi" })
049    protected static JavaFileManager getJavaFileManager(ProcessingEnvironment env) {
050        JavaFileManager fm = null;
051        /*
052         * Use reflection to avoid tickling
053         * https://bugs.openjdk.java.net/browse/JDK-8209058 on JDK 9 and 10.
054         */
055        try {
056            /*
057             * Context context = ((JavacProcessingEnvironment) env).getContext();
058             */
059            Method getContext = env.getClass().getMethod("getContext");
060
061            getContext.setAccessible(true);
062
063            Object context = getContext.invoke(env);
064            /*
065             * fm = context.get(JavaFileManager.class);
066             */
067            Method get = context.getClass().getMethod("get", Class.class);
068
069            get.setAccessible(true);
070
071            fm = (JavaFileManager) get.invoke(context, JavaFileManager.class);
072        } catch (Exception exception) {
073        }
074
075        return fm;
076    }
077}