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Blazingly fast Minecraft world manipulation for artists, builders and everyone else.

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/*
 * Piston, a flexible command management system.
 * Copyright (C) EngineHub 
 * Copyright (C) Piston contributors
 *
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser 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 Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program. If not, see .
 */

package org.enginehub.piston.gen.util;

import com.google.common.collect.ImmutableList;
import com.google.common.primitives.Primitives;

import javax.annotation.Nullable;
import javax.lang.model.element.AnnotationMirror;
import javax.lang.model.element.AnnotationValue;
import javax.lang.model.element.AnnotationValueVisitor;
import javax.lang.model.element.Element;
import javax.lang.model.util.SimpleAnnotationValueVisitor8;
import java.util.List;
import java.util.Objects;
import java.util.function.Predicate;

import static com.google.auto.common.AnnotationMirrors.getAnnotationValue;

/**
 * Provides a simple interface for extracting various types from annotations,
 * versus the complicated mess of a visitor system that is given by the Java SDK.
 */
public class AnnoValueExtraction {

    private static final class GeneralResult {
        @Nullable
        private final Object good;
        @Nullable
        private final Object bad;

        public GeneralResult(@Nullable Object good, @Nullable Object bad) {
            this.good = good;
            this.bad = bad;
        }
    }

    private static final AnnotationValueVisitor> GENERAL_VISITOR =
        new SimpleAnnotationValueVisitor8>() {
            @Override
            protected GeneralResult defaultAction(Object o, Predicate